Refactor code structure for improved readability and maintainability
This commit is contained in:
2160
libsrtp/crypto/cipher/aes.c
Normal file
2160
libsrtp/crypto/cipher/aes.c
Normal file
File diff suppressed because it is too large
Load Diff
442
libsrtp/crypto/cipher/aes_gcm_mbedtls.c
Normal file
442
libsrtp/crypto/cipher/aes_gcm_mbedtls.c
Normal file
@@ -0,0 +1,442 @@
|
||||
/*
|
||||
* aes_gcm_mbedtls.c
|
||||
*
|
||||
* AES Galois Counter Mode
|
||||
*
|
||||
* YongCheng Yang
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
#include <mbedtls/gcm.h>
|
||||
#include "aes_gcm.h"
|
||||
#include "alloc.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "crypto_types.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_gcm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes gcm mbedtls" /* printable module name */
|
||||
};
|
||||
|
||||
/**
|
||||
* SRTP IV Formation for AES-GCM
|
||||
* https://tools.ietf.org/html/rfc7714#section-8.1
|
||||
* 0 0 0 0 0 0 0 0 0 0 1 1
|
||||
* 0 1 2 3 4 5 6 7 8 9 0 1
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
* |00|00| SSRC | ROC | SEQ |---+
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* |
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* | Encryption Salt |->(+)
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* |
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* | Initialization Vector |<--+
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
*
|
||||
* SRTCP IV Formation for AES-GCM
|
||||
* https://tools.ietf.org/html/rfc7714#section-9.1
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* For now we only support 8 and 16 octet tags. The spec allows for
|
||||
* optional 12 byte tag, which may be supported in the future.
|
||||
*/
|
||||
#define GCM_IV_LEN 12
|
||||
#define GCM_AUTH_TAG_LEN 16
|
||||
#define GCM_AUTH_TAG_LEN_8 8
|
||||
|
||||
#define FUNC_ENTRY() debug_print(srtp_mod_aes_gcm, "%s entry", __func__);
|
||||
|
||||
/*
|
||||
* static function declarations.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_dealloc(srtp_cipher_t *c);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_context_init(void *cv,
|
||||
const uint8_t *key);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_set_aad(void *cv,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len);
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_decrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len);
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_gcm_128_mbedtls_description[] =
|
||||
"AES-128 GCM using mbedtls";
|
||||
static const char srtp_aes_gcm_256_mbedtls_description[] =
|
||||
"AES-256 GCM using mbedtls";
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_128 = {
|
||||
srtp_aes_gcm_mbedtls_alloc,
|
||||
srtp_aes_gcm_mbedtls_dealloc,
|
||||
srtp_aes_gcm_mbedtls_context_init,
|
||||
srtp_aes_gcm_mbedtls_set_aad,
|
||||
srtp_aes_gcm_mbedtls_encrypt,
|
||||
srtp_aes_gcm_mbedtls_decrypt,
|
||||
srtp_aes_gcm_mbedtls_set_iv,
|
||||
srtp_aes_gcm_128_mbedtls_description,
|
||||
&srtp_aes_gcm_128_test_case_0,
|
||||
SRTP_AES_GCM_128
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_256 = {
|
||||
srtp_aes_gcm_mbedtls_alloc,
|
||||
srtp_aes_gcm_mbedtls_dealloc,
|
||||
srtp_aes_gcm_mbedtls_context_init,
|
||||
srtp_aes_gcm_mbedtls_set_aad,
|
||||
srtp_aes_gcm_mbedtls_encrypt,
|
||||
srtp_aes_gcm_mbedtls_decrypt,
|
||||
srtp_aes_gcm_mbedtls_set_iv,
|
||||
srtp_aes_gcm_256_mbedtls_description,
|
||||
&srtp_aes_gcm_256_test_case_0,
|
||||
SRTP_AES_GCM_256
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 28 or 44 for
|
||||
* AES-128-GCM or AES-256-GCM respectively. Note that the
|
||||
* key length includes the 14 byte salt value that is used when
|
||||
* initializing the KDF.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *gcm;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with tag length %zu",
|
||||
tlen);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_GCM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_GCM_256_KEY_LEN_WSALT) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
if (tlen != GCM_AUTH_TAG_LEN && tlen != GCM_AUTH_TAG_LEN_8) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_gcm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm = (srtp_aes_gcm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_gcm_ctx_t));
|
||||
if (gcm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm->ctx =
|
||||
(mbedtls_gcm_context *)srtp_crypto_alloc(sizeof(mbedtls_gcm_context));
|
||||
if (gcm->ctx == NULL) {
|
||||
srtp_crypto_free(gcm);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
mbedtls_gcm_init(gcm->ctx);
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = gcm;
|
||||
|
||||
/* setup cipher attributes */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_GCM_128_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_128;
|
||||
(*c)->algorithm = SRTP_AES_GCM_128;
|
||||
gcm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
case SRTP_AES_GCM_256_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_256;
|
||||
(*c)->algorithm = SRTP_AES_GCM_256;
|
||||
gcm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates a GCM session
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *ctx;
|
||||
FUNC_ENTRY();
|
||||
ctx = (srtp_aes_gcm_ctx_t *)c->state;
|
||||
if (ctx) {
|
||||
mbedtls_gcm_free(ctx->ctx);
|
||||
srtp_crypto_free(ctx->ctx);
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_gcm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
uint32_t key_len_in_bits;
|
||||
int errCode = 0;
|
||||
c->dir = srtp_direction_any;
|
||||
c->aad_size = 0;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
key_len_in_bits = (c->key_size << 3);
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
break;
|
||||
default:
|
||||
return (srtp_err_status_bad_param);
|
||||
break;
|
||||
}
|
||||
|
||||
errCode =
|
||||
mbedtls_gcm_setkey(c->ctx, MBEDTLS_CIPHER_ID_AES, key, key_len_in_bits);
|
||||
if (errCode != 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "mbedtls error code: %d", errCode);
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
if (direction != srtp_direction_encrypt &&
|
||||
direction != srtp_direction_decrypt) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
c->dir = direction;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting iv: %s",
|
||||
srtp_octet_string_hex_string(iv, GCM_IV_LEN));
|
||||
c->iv_len = GCM_IV_LEN;
|
||||
memcpy(c->iv, iv, c->iv_len);
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function processes the AAD
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* aad Additional data to process for AEAD cipher suites
|
||||
* aad_len length of aad buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_set_aad(void *cv,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting AAD: %s",
|
||||
srtp_octet_string_hex_string(aad, aad_len));
|
||||
|
||||
if (aad_len + c->aad_size > MAX_AD_SIZE) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
memcpy(c->aad + c->aad_size, aad, aad_len);
|
||||
c->aad_size += aad_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int errCode = 0;
|
||||
|
||||
if (c->dir != srtp_direction_encrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len + c->tag_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
errCode = mbedtls_gcm_crypt_and_tag(c->ctx, MBEDTLS_GCM_ENCRYPT, src_len,
|
||||
c->iv, c->iv_len, c->aad, c->aad_size,
|
||||
src, dst, c->tag_len, dst + src_len);
|
||||
|
||||
c->aad_size = 0;
|
||||
if (errCode != 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "mbedtls error code: %d", errCode);
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
*dst_len = src_len + c->tag_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function decrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_mbedtls_decrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int errCode = 0;
|
||||
|
||||
if (c->dir != srtp_direction_decrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (src_len < c->tag_len) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < (src_len - c->tag_len)) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "AAD: %s",
|
||||
srtp_octet_string_hex_string(c->aad, c->aad_size));
|
||||
|
||||
errCode = mbedtls_gcm_auth_decrypt(
|
||||
c->ctx, (src_len - c->tag_len), c->iv, c->iv_len, c->aad, c->aad_size,
|
||||
src + (src_len - c->tag_len), c->tag_len, src, dst);
|
||||
c->aad_size = 0;
|
||||
if (errCode != 0) {
|
||||
return srtp_err_status_auth_fail;
|
||||
}
|
||||
|
||||
/*
|
||||
* Reduce the buffer size by the tag length since the tag
|
||||
* is not part of the original payload
|
||||
*/
|
||||
*dst_len = (src_len - c->tag_len);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
431
libsrtp/crypto/cipher/aes_gcm_nss.c
Normal file
431
libsrtp/crypto/cipher/aes_gcm_nss.c
Normal file
@@ -0,0 +1,431 @@
|
||||
/*
|
||||
* aes_gcm_nss.c
|
||||
*
|
||||
* AES Galois Counter Mode
|
||||
*
|
||||
* Richard L. Barnes
|
||||
* Cisco Systems, Inc.
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include "aes_gcm.h"
|
||||
#include "alloc.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "crypto_types.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
#include <secerr.h>
|
||||
#include <nspr.h>
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_gcm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes gcm nss" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* For now we only support 8 and 16 octet tags. The spec allows for
|
||||
* optional 12 byte tag, which may be supported in the future.
|
||||
*/
|
||||
#define GCM_IV_LEN 12
|
||||
#define GCM_AUTH_TAG_LEN 16
|
||||
#define GCM_AUTH_TAG_LEN_8 8
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 28 or 44 for
|
||||
* AES-128-GCM or AES-256-GCM respectively. Note that the
|
||||
* key length includes the 14 byte salt value that is used when
|
||||
* initializing the KDF.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *gcm;
|
||||
NSSInitContext *nss;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with tag length %zu",
|
||||
tlen);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_GCM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_GCM_256_KEY_LEN_WSALT) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
if (tlen != GCM_AUTH_TAG_LEN && tlen != GCM_AUTH_TAG_LEN_8) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
/* Initialize NSS equiv of NSS_NoDB_Init(NULL) */
|
||||
nss = NSS_InitContext("", "", "", "", NULL,
|
||||
NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
|
||||
NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
|
||||
NSS_INIT_OPTIMIZESPACE);
|
||||
if (!nss) {
|
||||
return (srtp_err_status_cipher_fail);
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_gcm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
NSS_ShutdownContext(nss);
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm = (srtp_aes_gcm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_gcm_ctx_t));
|
||||
if (gcm == NULL) {
|
||||
NSS_ShutdownContext(nss);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm->nss = nss;
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = gcm;
|
||||
|
||||
/* setup cipher attributes */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_GCM_128_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_128;
|
||||
(*c)->algorithm = SRTP_AES_GCM_128;
|
||||
gcm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
gcm->tag_size = tlen;
|
||||
gcm->params.ulTagBits = 8 * tlen;
|
||||
break;
|
||||
case SRTP_AES_GCM_256_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_256;
|
||||
(*c)->algorithm = SRTP_AES_GCM_256;
|
||||
gcm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
gcm->tag_size = tlen;
|
||||
gcm->params.ulTagBits = 8 * tlen;
|
||||
break;
|
||||
default:
|
||||
/* this should never hit, but to be sure... */
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
/* set key size and tag size*/
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates a GCM session
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *ctx;
|
||||
|
||||
ctx = (srtp_aes_gcm_ctx_t *)c->state;
|
||||
if (ctx) {
|
||||
/* release NSS resources */
|
||||
if (ctx->key) {
|
||||
PK11_FreeSymKey(ctx->key);
|
||||
}
|
||||
|
||||
if (ctx->nss) {
|
||||
NSS_ShutdownContext(ctx->nss);
|
||||
ctx->nss = NULL;
|
||||
}
|
||||
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_gcm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_gcm_nss_context_init(...) initializes the aes_gcm_context
|
||||
* using the value in key[].
|
||||
*
|
||||
* the key is the secret key
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
c->dir = srtp_direction_any;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
|
||||
if (c->key) {
|
||||
PK11_FreeSymKey(c->key);
|
||||
c->key = NULL;
|
||||
}
|
||||
|
||||
PK11SlotInfo *slot = PK11_GetBestSlot(CKM_AES_GCM, NULL);
|
||||
if (!slot) {
|
||||
return (srtp_err_status_cipher_fail);
|
||||
}
|
||||
|
||||
/* explicitly cast away const of key */
|
||||
SECItem key_item = { siBuffer, (unsigned char *)(uintptr_t)key,
|
||||
c->key_size };
|
||||
c->key = PK11_ImportSymKey(slot, CKM_AES_GCM, PK11_OriginUnwrap,
|
||||
CKA_ENCRYPT, &key_item, NULL);
|
||||
PK11_FreeSlot(slot);
|
||||
|
||||
if (!c->key) {
|
||||
return (srtp_err_status_cipher_fail);
|
||||
}
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_gcm_nss_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
if (direction != srtp_direction_encrypt &&
|
||||
direction != srtp_direction_decrypt) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
c->dir = direction;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting iv: %s",
|
||||
srtp_octet_string_hex_string(iv, GCM_IV_LEN));
|
||||
|
||||
memcpy(c->iv, iv, GCM_IV_LEN);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function processes the AAD
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* aad Additional data to process for AEAD cipher suites
|
||||
* aad_len length of aad buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_set_aad(void *cv,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting AAD: %s",
|
||||
srtp_octet_string_hex_string(aad, aad_len));
|
||||
|
||||
if (aad_len + c->aad_size > MAX_AD_SIZE) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
memcpy(c->aad + c->aad_size, aad, aad_len);
|
||||
c->aad_size += aad_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_do_crypto(void *cv,
|
||||
bool encrypt,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
c->params.pIv = c->iv;
|
||||
c->params.ulIvLen = GCM_IV_LEN;
|
||||
c->params.pAAD = c->aad;
|
||||
c->params.ulAADLen = c->aad_size;
|
||||
|
||||
// Reset AAD
|
||||
c->aad_size = 0;
|
||||
|
||||
unsigned int out_len = 0;
|
||||
int rv;
|
||||
SECItem param = { siBuffer, (unsigned char *)&c->params,
|
||||
sizeof(CK_GCM_PARAMS) };
|
||||
if (encrypt) {
|
||||
if (c->dir != srtp_direction_encrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len + c->tag_size) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
rv = PK11_Encrypt(c->key, CKM_AES_GCM, ¶m, dst, &out_len, *dst_len,
|
||||
src, src_len);
|
||||
} else {
|
||||
if (c->dir != srtp_direction_decrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (src_len < c->tag_size) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len - c->tag_size) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
rv = PK11_Decrypt(c->key, CKM_AES_GCM, ¶m, dst, &out_len, *dst_len,
|
||||
src, src_len);
|
||||
}
|
||||
*dst_len = out_len;
|
||||
srtp_err_status_t status = srtp_err_status_ok;
|
||||
if (rv != SECSuccess) {
|
||||
status = srtp_err_status_cipher_fail;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
return srtp_aes_gcm_nss_do_crypto(cv, true, src, src_len, dst, dst_len);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function decrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_nss_decrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
uint8_t tagbuf[16];
|
||||
uint8_t *non_null_dst_buf = dst;
|
||||
if (!non_null_dst_buf && (*dst_len == 0)) {
|
||||
non_null_dst_buf = tagbuf;
|
||||
*dst_len = sizeof(tagbuf);
|
||||
} else if (!non_null_dst_buf) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
srtp_err_status_t status = srtp_aes_gcm_nss_do_crypto(
|
||||
cv, false, src, src_len, non_null_dst_buf, dst_len);
|
||||
if (status != srtp_err_status_ok) {
|
||||
int err = PR_GetError();
|
||||
if (err == SEC_ERROR_BAD_DATA) {
|
||||
status = srtp_err_status_auth_fail;
|
||||
}
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_gcm_128_nss_description[] = "AES-128 GCM using NSS";
|
||||
static const char srtp_aes_gcm_256_nss_description[] = "AES-256 GCM using NSS";
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_128 = {
|
||||
srtp_aes_gcm_nss_alloc,
|
||||
srtp_aes_gcm_nss_dealloc,
|
||||
srtp_aes_gcm_nss_context_init,
|
||||
srtp_aes_gcm_nss_set_aad,
|
||||
srtp_aes_gcm_nss_encrypt,
|
||||
srtp_aes_gcm_nss_decrypt,
|
||||
srtp_aes_gcm_nss_set_iv,
|
||||
srtp_aes_gcm_128_nss_description,
|
||||
&srtp_aes_gcm_128_test_case_0,
|
||||
SRTP_AES_GCM_128
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_256 = {
|
||||
srtp_aes_gcm_nss_alloc,
|
||||
srtp_aes_gcm_nss_dealloc,
|
||||
srtp_aes_gcm_nss_context_init,
|
||||
srtp_aes_gcm_nss_set_aad,
|
||||
srtp_aes_gcm_nss_encrypt,
|
||||
srtp_aes_gcm_nss_decrypt,
|
||||
srtp_aes_gcm_nss_set_iv,
|
||||
srtp_aes_gcm_256_nss_description,
|
||||
&srtp_aes_gcm_256_test_case_0,
|
||||
SRTP_AES_GCM_256
|
||||
};
|
||||
/* clang-format on */
|
||||
432
libsrtp/crypto/cipher/aes_gcm_ossl.c
Normal file
432
libsrtp/crypto/cipher/aes_gcm_ossl.c
Normal file
@@ -0,0 +1,432 @@
|
||||
/*
|
||||
* aes_gcm_ossl.c
|
||||
*
|
||||
* AES Galois Counter Mode
|
||||
*
|
||||
* John A. Foley
|
||||
* Cisco Systems, Inc.
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include <openssl/evp.h>
|
||||
#include "aes_gcm.h"
|
||||
#include "alloc.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "crypto_types.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_gcm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes gcm" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* For now we only support 8 and 16 octet tags. The spec allows for
|
||||
* optional 12 byte tag, which may be supported in the future.
|
||||
*/
|
||||
#define GCM_AUTH_TAG_LEN 16
|
||||
#define GCM_AUTH_TAG_LEN_8 8
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 28 or 44 for
|
||||
* AES-128-GCM or AES-256-GCM respectively. Note that the
|
||||
* key length includes the 14 byte salt value that is used when
|
||||
* initializing the KDF.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *gcm;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with tag length %zu",
|
||||
tlen);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_GCM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_GCM_256_KEY_LEN_WSALT) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
if (tlen != GCM_AUTH_TAG_LEN && tlen != GCM_AUTH_TAG_LEN_8) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_gcm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm = (srtp_aes_gcm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_gcm_ctx_t));
|
||||
if (gcm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm->ctx = EVP_CIPHER_CTX_new();
|
||||
if (gcm->ctx == NULL) {
|
||||
srtp_crypto_free(gcm);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = gcm;
|
||||
|
||||
/* setup cipher attributes */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_GCM_128_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_128;
|
||||
(*c)->algorithm = SRTP_AES_GCM_128;
|
||||
gcm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
case SRTP_AES_GCM_256_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_256;
|
||||
(*c)->algorithm = SRTP_AES_GCM_256;
|
||||
gcm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates a GCM session
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *ctx;
|
||||
|
||||
ctx = (srtp_aes_gcm_ctx_t *)c->state;
|
||||
if (ctx) {
|
||||
EVP_CIPHER_CTX_free(ctx->ctx);
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_gcm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_gcm_openssl_context_init(...) initializes the aes_gcm_context
|
||||
* using the value in key[].
|
||||
*
|
||||
* the key is the secret key
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
const EVP_CIPHER *evp;
|
||||
|
||||
c->dir = srtp_direction_any;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
evp = EVP_aes_256_gcm();
|
||||
break;
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
evp = EVP_aes_128_gcm();
|
||||
break;
|
||||
default:
|
||||
return (srtp_err_status_bad_param);
|
||||
break;
|
||||
}
|
||||
|
||||
EVP_CIPHER_CTX_reset(c->ctx);
|
||||
|
||||
if (!EVP_CipherInit_ex(c->ctx, evp, NULL, key, NULL, 0)) {
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
|
||||
if (!EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_SET_IVLEN, 12, 0)) {
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_gcm_openssl_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
|
||||
if (direction != srtp_direction_encrypt &&
|
||||
direction != srtp_direction_decrypt) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
c->dir = direction;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting iv: %s",
|
||||
srtp_octet_string_hex_string(iv, 12));
|
||||
|
||||
if (c->dir == srtp_direction_encrypt) {
|
||||
if (EVP_EncryptInit_ex(c->ctx, NULL, NULL, NULL, iv) != 1) {
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
} else {
|
||||
if (EVP_DecryptInit_ex(c->ctx, NULL, NULL, NULL, iv) != 1) {
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function processes the AAD
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* aad Additional data to process for AEAD cipher suites
|
||||
* aad_len length of aad buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_set_aad(void *cv,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int len = 0;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting AAD: %s",
|
||||
srtp_octet_string_hex_string(aad, aad_len));
|
||||
|
||||
if (c->dir == srtp_direction_encrypt) {
|
||||
if (EVP_EncryptUpdate(c->ctx, NULL, &len, aad, aad_len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
} else {
|
||||
if (EVP_DecryptUpdate(c->ctx, NULL, &len, aad, aad_len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
}
|
||||
|
||||
if (len != (int)aad_len) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int len = 0;
|
||||
|
||||
if (c->dir != srtp_direction_encrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len + c->tag_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
/*
|
||||
* Encrypt the data
|
||||
*/
|
||||
if (EVP_EncryptUpdate(c->ctx, dst, &len, src, src_len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
*dst_len = len;
|
||||
|
||||
/*
|
||||
* Calculate the tag
|
||||
*/
|
||||
if (EVP_EncryptFinal_ex(c->ctx, dst + len, &len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
*dst_len += len;
|
||||
|
||||
/*
|
||||
* Retrieve the tag
|
||||
*/
|
||||
if (EVP_CIPHER_CTX_ctrl(c->ctx, EVP_CTRL_GCM_GET_TAG, c->tag_len,
|
||||
dst + *dst_len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
*dst_len += c->tag_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function decrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_openssl_decrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int len = 0;
|
||||
|
||||
if (c->dir != srtp_direction_decrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (src_len < c->tag_len) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len - c->tag_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
/*
|
||||
* Decrypt the data
|
||||
*/
|
||||
if (EVP_DecryptUpdate(c->ctx, dst, &len, src, src_len - c->tag_len) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
*dst_len = len;
|
||||
|
||||
/*
|
||||
* Set the tag before decrypting
|
||||
*
|
||||
* explicitly cast away const of src
|
||||
*/
|
||||
if (EVP_CIPHER_CTX_ctrl(
|
||||
c->ctx, EVP_CTRL_GCM_SET_TAG, c->tag_len,
|
||||
(void *)(uintptr_t)(src + (src_len - c->tag_len))) != 1) {
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check the tag
|
||||
*/
|
||||
if (EVP_DecryptFinal_ex(c->ctx, dst + *dst_len, &len) != 1) {
|
||||
return srtp_err_status_auth_fail;
|
||||
}
|
||||
*dst_len += len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_gcm_128_openssl_description[] =
|
||||
"AES-128 GCM using openssl";
|
||||
static const char srtp_aes_gcm_256_openssl_description[] =
|
||||
"AES-256 GCM using openssl";
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_128 = {
|
||||
srtp_aes_gcm_openssl_alloc,
|
||||
srtp_aes_gcm_openssl_dealloc,
|
||||
srtp_aes_gcm_openssl_context_init,
|
||||
srtp_aes_gcm_openssl_set_aad,
|
||||
srtp_aes_gcm_openssl_encrypt,
|
||||
srtp_aes_gcm_openssl_decrypt,
|
||||
srtp_aes_gcm_openssl_set_iv,
|
||||
srtp_aes_gcm_128_openssl_description,
|
||||
&srtp_aes_gcm_128_test_case_0,
|
||||
SRTP_AES_GCM_128
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_256 = {
|
||||
srtp_aes_gcm_openssl_alloc,
|
||||
srtp_aes_gcm_openssl_dealloc,
|
||||
srtp_aes_gcm_openssl_context_init,
|
||||
srtp_aes_gcm_openssl_set_aad,
|
||||
srtp_aes_gcm_openssl_encrypt,
|
||||
srtp_aes_gcm_openssl_decrypt,
|
||||
srtp_aes_gcm_openssl_set_iv,
|
||||
srtp_aes_gcm_256_openssl_description,
|
||||
&srtp_aes_gcm_256_test_case_0,
|
||||
SRTP_AES_GCM_256
|
||||
};
|
||||
/* clang-format on */
|
||||
474
libsrtp/crypto/cipher/aes_gcm_wssl.c
Normal file
474
libsrtp/crypto/cipher/aes_gcm_wssl.c
Normal file
@@ -0,0 +1,474 @@
|
||||
/*
|
||||
* aes_gcm_wssl.c
|
||||
*
|
||||
* AES Galois Counter Mode using wolfSSL
|
||||
*
|
||||
* Sean Parkinson, wolfSSL
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
#ifndef WOLFSSL_USER_SETTINGS
|
||||
#include <wolfssl/options.h>
|
||||
#endif
|
||||
#include <wolfssl/wolfcrypt/settings.h>
|
||||
#include <wolfssl/wolfcrypt/aes.h>
|
||||
#include "aes_gcm.h"
|
||||
#include "alloc.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "crypto_types.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_gcm = {
|
||||
0, /* debugging is off by default */
|
||||
"aes gcm wssl" /* printable module name */
|
||||
};
|
||||
|
||||
/**
|
||||
* SRTP IV Formation for AES-GCM
|
||||
* https://tools.ietf.org/html/rfc7714#section-8.1
|
||||
* 0 0 0 0 0 0 0 0 0 0 1 1
|
||||
* 0 1 2 3 4 5 6 7 8 9 0 1
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
* |00|00| SSRC | ROC | SEQ |---+
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* |
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* | Encryption Salt |->(+)
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* |
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+ |
|
||||
* | Initialization Vector |<--+
|
||||
* +--+--+--+--+--+--+--+--+--+--+--+--+
|
||||
*
|
||||
* SRTCP IV Formation for AES-GCM
|
||||
* https://tools.ietf.org/html/rfc7714#section-9.1
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* For now we only support 8 and 16 octet tags. The spec allows for
|
||||
* optional 12 byte tag, which may be supported in the future.
|
||||
*/
|
||||
#define GCM_AUTH_TAG_LEN AES_BLOCK_SIZE
|
||||
#define GCM_AUTH_TAG_LEN_8 8
|
||||
|
||||
#define FUNC_ENTRY() debug_print(srtp_mod_aes_gcm, "%s entry", __func__);
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 28 or 44 for
|
||||
* AES-128-GCM or AES-256-GCM respectively. Note that the
|
||||
* key length includes the 14 byte salt value that is used when
|
||||
* initializing the KDF.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *gcm;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
debug_print(srtp_mod_aes_gcm, "allocating cipher with tag length %zu",
|
||||
tlen);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_GCM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_GCM_256_KEY_LEN_WSALT) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
if (tlen != GCM_AUTH_TAG_LEN && tlen != GCM_AUTH_TAG_LEN_8) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_gcm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
|
||||
gcm = (srtp_aes_gcm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_gcm_ctx_t));
|
||||
if (gcm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return (srtp_err_status_alloc_fail);
|
||||
}
|
||||
gcm->ctx = NULL;
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = gcm;
|
||||
|
||||
/* setup cipher attributes */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_GCM_128_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_128;
|
||||
(*c)->algorithm = SRTP_AES_GCM_128;
|
||||
gcm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
case SRTP_AES_GCM_256_KEY_LEN_WSALT:
|
||||
(*c)->type = &srtp_aes_gcm_256;
|
||||
(*c)->algorithm = SRTP_AES_GCM_256;
|
||||
gcm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
gcm->tag_len = tlen;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates a GCM session
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_gcm_ctx_t *ctx;
|
||||
FUNC_ENTRY();
|
||||
ctx = (srtp_aes_gcm_ctx_t *)c->state;
|
||||
if (ctx != NULL) {
|
||||
if (ctx->ctx != NULL) {
|
||||
wc_AesFree(ctx->ctx);
|
||||
srtp_crypto_free(ctx->ctx);
|
||||
}
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_gcm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int err;
|
||||
|
||||
c->dir = srtp_direction_any;
|
||||
#ifndef WOLFSSL_AESGCM_STREAM
|
||||
c->aad_size = 0;
|
||||
#endif
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
break;
|
||||
default:
|
||||
return (srtp_err_status_bad_param);
|
||||
break;
|
||||
}
|
||||
|
||||
if (c->ctx == NULL) {
|
||||
c->ctx = (Aes *)srtp_crypto_alloc(sizeof(Aes));
|
||||
if (c->ctx == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
err = wc_AesInit(c->ctx, NULL, INVALID_DEVID);
|
||||
if (err < 0) {
|
||||
srtp_crypto_free(c->ctx);
|
||||
c->ctx = NULL;
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
}
|
||||
|
||||
err = wc_AesGcmSetKey(c->ctx, (const unsigned char *)key, c->key_size);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
#ifdef WOLFSSL_AESGCM_STREAM
|
||||
int err;
|
||||
#endif
|
||||
|
||||
if (direction != srtp_direction_encrypt &&
|
||||
direction != srtp_direction_decrypt) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
c->dir = direction;
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting iv: %s",
|
||||
srtp_octet_string_hex_string(iv, GCM_NONCE_MID_SZ));
|
||||
#ifndef WOLFSSL_AESGCM_STREAM
|
||||
c->iv_len = GCM_NONCE_MID_SZ;
|
||||
memcpy(c->iv, iv, c->iv_len);
|
||||
|
||||
c->aad_size = 0;
|
||||
#else
|
||||
err = wc_AesGcmInit(c->ctx, NULL, 0, iv, GCM_NONCE_MID_SZ);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
#endif
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function processes the AAD
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* aad Additional data to process for AEAD cipher suites
|
||||
* aad_len length of aad buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_set_aad(void *cv,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
#ifdef WOLFSSL_AESGCM_STREAM
|
||||
int err;
|
||||
#endif
|
||||
|
||||
debug_print(srtp_mod_aes_gcm, "setting AAD: %s",
|
||||
srtp_octet_string_hex_string(aad, aad_len));
|
||||
|
||||
#ifndef WOLFSSL_AESGCM_STREAM
|
||||
if (aad_len + c->aad_size > MAX_AD_SIZE) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
memcpy(c->aad + c->aad_size, aad, aad_len);
|
||||
c->aad_size += aad_len;
|
||||
#else
|
||||
if (c->dir == srtp_direction_encrypt) {
|
||||
err = wc_AesGcmEncryptUpdate(c->ctx, NULL, NULL, 0, aad, aad_len);
|
||||
} else {
|
||||
err = wc_AesGcmDecryptUpdate(c->ctx, NULL, NULL, 0, aad, aad_len);
|
||||
}
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
#endif
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int err;
|
||||
|
||||
if (c->dir != srtp_direction_encrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len + c->tag_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
#ifndef WOLFSSL_AESGCM_STREAM
|
||||
// tag must always be 16 bytes when passed to wc_AesGcmEncrypt, can truncate
|
||||
// to c->tag_len after
|
||||
uint8_t tag[GCM_AUTH_TAG_LEN];
|
||||
err = wc_AesGcmEncrypt(c->ctx, dst, src, src_len, c->iv, c->iv_len, tag,
|
||||
sizeof(tag), c->aad, c->aad_size);
|
||||
c->aad_size = 0;
|
||||
if (err == 0) {
|
||||
memcpy(dst + src_len, tag, c->tag_len);
|
||||
}
|
||||
#else
|
||||
err = wc_AesGcmEncryptUpdate(c->ctx, dst, src, src_len, NULL, 0);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
err = wc_AesGcmEncryptFinal(c->ctx, dst + src_len, c->tag_len);
|
||||
#endif
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
printf("wolfSSL error code: %d\n", err);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
|
||||
*dst_len = src_len + c->tag_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function decrypts a buffer using AES GCM mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_gcm_wolfssl_decrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
FUNC_ENTRY();
|
||||
srtp_aes_gcm_ctx_t *c = (srtp_aes_gcm_ctx_t *)cv;
|
||||
int err;
|
||||
|
||||
if (c->dir != srtp_direction_decrypt) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (src_len < c->tag_len) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len - c->tag_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
#ifndef WOLFSSL_AESGCM_STREAM
|
||||
debug_print(srtp_mod_aes_gcm, "AAD: %s",
|
||||
srtp_octet_string_hex_string(c->aad, c->aad_size));
|
||||
|
||||
err = wc_AesGcmDecrypt(c->ctx, dst, src, (src_len - c->tag_len), c->iv,
|
||||
c->iv_len, src + (src_len - c->tag_len), c->tag_len,
|
||||
c->aad, c->aad_size);
|
||||
c->aad_size = 0;
|
||||
#else
|
||||
err = wc_AesGcmDecryptUpdate(c->ctx, dst, src, (src_len - c->tag_len), NULL,
|
||||
0);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
err =
|
||||
wc_AesGcmDecryptFinal(c->ctx, src + (src_len - c->tag_len), c->tag_len);
|
||||
#endif
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_gcm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_auth_fail;
|
||||
}
|
||||
|
||||
/*
|
||||
* Reduce the buffer size by the tag length since the tag
|
||||
* is not part of the original payload
|
||||
*/
|
||||
*dst_len = src_len -= c->tag_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_gcm_128_wolfssl_description[] =
|
||||
"AES-128 GCM using wolfssl";
|
||||
static const char srtp_aes_gcm_256_wolfssl_description[] =
|
||||
"AES-256 GCM using wolfssl";
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_128 = {
|
||||
srtp_aes_gcm_wolfssl_alloc,
|
||||
srtp_aes_gcm_wolfssl_dealloc,
|
||||
srtp_aes_gcm_wolfssl_context_init,
|
||||
srtp_aes_gcm_wolfssl_set_aad,
|
||||
srtp_aes_gcm_wolfssl_encrypt,
|
||||
srtp_aes_gcm_wolfssl_decrypt,
|
||||
srtp_aes_gcm_wolfssl_set_iv,
|
||||
srtp_aes_gcm_128_wolfssl_description,
|
||||
&srtp_aes_gcm_128_test_case_0,
|
||||
SRTP_AES_GCM_128
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/*
|
||||
* This is the vector function table for this crypto engine.
|
||||
*/
|
||||
/* clang-format off */
|
||||
const srtp_cipher_type_t srtp_aes_gcm_256 = {
|
||||
srtp_aes_gcm_wolfssl_alloc,
|
||||
srtp_aes_gcm_wolfssl_dealloc,
|
||||
srtp_aes_gcm_wolfssl_context_init,
|
||||
srtp_aes_gcm_wolfssl_set_aad,
|
||||
srtp_aes_gcm_wolfssl_encrypt,
|
||||
srtp_aes_gcm_wolfssl_decrypt,
|
||||
srtp_aes_gcm_wolfssl_set_iv,
|
||||
srtp_aes_gcm_256_wolfssl_description,
|
||||
&srtp_aes_gcm_256_test_case_0,
|
||||
SRTP_AES_GCM_256
|
||||
};
|
||||
/* clang-format on */
|
||||
449
libsrtp/crypto/cipher/aes_icm.c
Normal file
449
libsrtp/crypto/cipher/aes_icm.c
Normal file
@@ -0,0 +1,449 @@
|
||||
/*
|
||||
* aes_icm.c
|
||||
*
|
||||
* AES Integer Counter Mode
|
||||
*
|
||||
* David A. McGrew
|
||||
* Cisco Systems, Inc.
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2001-2017 Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#define ALIGN_32 0
|
||||
|
||||
#include "aes_icm.h"
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_icm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes icm" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* integer counter mode works as follows:
|
||||
*
|
||||
* 16 bits
|
||||
* <----->
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
* | nonce | pakcet index | ctr |---+
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ v
|
||||
* | salt |000000|->(+)
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +---------+
|
||||
* | encrypt |
|
||||
* +---------+
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* | keystream block |<--+
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
*
|
||||
* All fields are big-endian
|
||||
*
|
||||
* ctr is the block counter, which increments from zero for
|
||||
* each packet (16 bits wide)
|
||||
*
|
||||
* packet index is distinct for each packet (48 bits wide)
|
||||
*
|
||||
* nonce can be distinct across many uses of the same key, or
|
||||
* can be a fixed value per key, or can be per-packet randomness
|
||||
* (64 bits)
|
||||
*
|
||||
*/
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *icm;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/*
|
||||
* The check for key_len = 30/46 does not apply. Our usage
|
||||
* of aes functions with key_len = values other than 30
|
||||
* has not broken anything. Don't know what would be the
|
||||
* effect of skipping this check for srtp in general.
|
||||
*/
|
||||
if (key_len != SRTP_AES_ICM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_icm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm = (srtp_aes_icm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_icm_ctx_t));
|
||||
if (icm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = icm;
|
||||
|
||||
switch (key_len) {
|
||||
case SRTP_AES_ICM_256_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_256;
|
||||
(*c)->type = &srtp_aes_icm_256;
|
||||
break;
|
||||
default:
|
||||
(*c)->algorithm = SRTP_AES_ICM_128;
|
||||
(*c)->type = &srtp_aes_icm_128;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
icm->key_size = key_len;
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *ctx;
|
||||
|
||||
if (c == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
ctx = (srtp_aes_icm_ctx_t *)c->state;
|
||||
if (ctx) {
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_icm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free the cipher context */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_context_init(...) initializes the aes_icm_context
|
||||
* using the value in key[].
|
||||
*
|
||||
* the key is the secret key
|
||||
*
|
||||
* the salt is unpredictable (but not necessarily secret) data which
|
||||
* randomizes the starting point in the keystream
|
||||
*/
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_context_init(void *cv, const uint8_t *key)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
srtp_err_status_t status;
|
||||
size_t base_key_len, copy_len;
|
||||
|
||||
if (c->key_size == SRTP_AES_ICM_128_KEY_LEN_WSALT ||
|
||||
c->key_size == SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
base_key_len = c->key_size - SRTP_SALT_LEN;
|
||||
} else {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/*
|
||||
* set counter and initial values to 'offset' value, being careful not to
|
||||
* go past the end of the key buffer
|
||||
*/
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
|
||||
copy_len = c->key_size - base_key_len;
|
||||
/* force last two octets of the offset to be left zero (for srtp
|
||||
* compatibility) */
|
||||
if (copy_len > SRTP_SALT_LEN) {
|
||||
copy_len = SRTP_SALT_LEN;
|
||||
}
|
||||
|
||||
memcpy(&c->counter, key + base_key_len, copy_len);
|
||||
memcpy(&c->offset, key + base_key_len, copy_len);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, base_key_len));
|
||||
debug_print(srtp_mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
|
||||
|
||||
/* expand key */
|
||||
status =
|
||||
srtp_aes_expand_encryption_key(key, base_key_len, &c->expanded_key);
|
||||
if (status) {
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* indicate that the keystream_buffer is empty */
|
||||
c->bytes_in_buffer = 0;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_set_iv(void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
v128_t nonce;
|
||||
(void)direction;
|
||||
|
||||
/* set nonce (for alignment) */
|
||||
v128_copy_octet_string(&nonce, iv);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
|
||||
|
||||
v128_xor(&c->counter, &c->offset, &nonce);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "set_counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
|
||||
/* indicate that the keystream_buffer is empty */
|
||||
c->bytes_in_buffer = 0;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_advance(...) refills the keystream_buffer and
|
||||
* advances the block index of the sicm_context forward by one
|
||||
*
|
||||
* this is an internal, hopefully inlined function
|
||||
*/
|
||||
static void srtp_aes_icm_advance(srtp_aes_icm_ctx_t *c)
|
||||
{
|
||||
/* fill buffer with new keystream */
|
||||
v128_copy(&c->keystream_buffer, &c->counter);
|
||||
srtp_aes_encrypt(&c->keystream_buffer, &c->expanded_key);
|
||||
c->bytes_in_buffer = sizeof(v128_t);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
debug_print(srtp_mod_aes_icm, "ciphertext: %s",
|
||||
v128_hex_string(&c->keystream_buffer));
|
||||
|
||||
/* clock counter forward */
|
||||
if (!++(c->counter.v8[15])) {
|
||||
++(c->counter.v8[14]);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* icm_encrypt deals with the following cases:
|
||||
*
|
||||
* bytes_to_encr < bytes_in_buffer
|
||||
* - add keystream into data
|
||||
*
|
||||
* bytes_to_encr > bytes_in_buffer
|
||||
* - add keystream into data until keystream_buffer is depleted
|
||||
* - loop over blocks, filling keystream_buffer and then
|
||||
* adding keystream into data
|
||||
* - fill buffer then add in remaining (< 16) bytes of keystream
|
||||
*/
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
size_t bytes_to_encr = src_len;
|
||||
uint32_t *b;
|
||||
const uint32_t *s;
|
||||
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
*dst_len = src_len;
|
||||
|
||||
unsigned char *buf = dst;
|
||||
|
||||
/* check that there's enough segment left*/
|
||||
size_t bytes_of_new_keystream = bytes_to_encr - c->bytes_in_buffer;
|
||||
size_t blocks_of_new_keystream = (bytes_of_new_keystream + 15) >> 4;
|
||||
if ((blocks_of_new_keystream + htons(c->counter.v16[7])) > 0xffff) {
|
||||
return srtp_err_status_terminus;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "block index: %d", htons(c->counter.v16[7]));
|
||||
if (bytes_to_encr <= c->bytes_in_buffer) {
|
||||
/* deal with odd case of small bytes_to_encr */
|
||||
for (size_t i = (sizeof(v128_t) - c->bytes_in_buffer);
|
||||
i < (sizeof(v128_t) - c->bytes_in_buffer + bytes_to_encr); i++) {
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[i];
|
||||
}
|
||||
|
||||
c->bytes_in_buffer -= bytes_to_encr;
|
||||
|
||||
/* return now to avoid the main loop */
|
||||
return srtp_err_status_ok;
|
||||
|
||||
} else {
|
||||
/* encrypt bytes until the remaining data is 16-byte aligned */
|
||||
for (size_t i = (sizeof(v128_t) - c->bytes_in_buffer);
|
||||
i < sizeof(v128_t); i++) {
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[i];
|
||||
}
|
||||
|
||||
bytes_to_encr -= c->bytes_in_buffer;
|
||||
c->bytes_in_buffer = 0;
|
||||
}
|
||||
|
||||
/* now loop over entire 16-byte blocks of keystream */
|
||||
for (size_t i = 0; i < (bytes_to_encr / sizeof(v128_t)); i++) {
|
||||
/* fill buffer with new keystream */
|
||||
srtp_aes_icm_advance(c);
|
||||
|
||||
/*
|
||||
* add keystream into the data buffer (this would be a lot faster
|
||||
* if we could assume 32-bit alignment!)
|
||||
*/
|
||||
|
||||
#if ALIGN_32
|
||||
b = (uint32_t *)buf;
|
||||
s = (const uint32_t *)src;
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[0];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[1];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[2];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[3];
|
||||
buf = (uint8_t *)b;
|
||||
src = (const uint8_t *)s;
|
||||
#else
|
||||
if ((((uintptr_t)buf) & 0x03) != 0) {
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[0];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[1];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[2];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[3];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[4];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[5];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[6];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[7];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[8];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[9];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[10];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[11];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[12];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[13];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[14];
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[15];
|
||||
} else {
|
||||
b = (uint32_t *)buf;
|
||||
s = (const uint32_t *)src;
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[0];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[1];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[2];
|
||||
*b++ = *s++ ^ c->keystream_buffer.v32[3];
|
||||
buf = (uint8_t *)b;
|
||||
src = (const uint8_t *)s;
|
||||
}
|
||||
#endif /* #if ALIGN_32 */
|
||||
}
|
||||
|
||||
/* if there is a tail end of the data, process it */
|
||||
if ((bytes_to_encr & 0xf) != 0) {
|
||||
/* fill buffer with new keystream */
|
||||
srtp_aes_icm_advance(c);
|
||||
|
||||
for (size_t i = 0; i < (bytes_to_encr & 0xf); i++) {
|
||||
*buf++ = *src++ ^ c->keystream_buffer.v8[i];
|
||||
}
|
||||
|
||||
/* reset the keystream buffer size to right value */
|
||||
c->bytes_in_buffer = sizeof(v128_t) - (bytes_to_encr & 0xf);
|
||||
} else {
|
||||
/* no tail, so just reset the keystream buffer size to zero */
|
||||
c->bytes_in_buffer = 0;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static const char srtp_aes_icm_128_description[] =
|
||||
"AES-128 integer counter mode";
|
||||
static const char srtp_aes_icm_256_description[] =
|
||||
"AES-256 integer counter mode";
|
||||
|
||||
/*
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
|
||||
const srtp_cipher_type_t srtp_aes_icm_128 = {
|
||||
srtp_aes_icm_alloc, /* */
|
||||
srtp_aes_icm_dealloc, /* */
|
||||
srtp_aes_icm_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_encrypt, /* */
|
||||
srtp_aes_icm_encrypt, /* */
|
||||
srtp_aes_icm_set_iv, /* */
|
||||
srtp_aes_icm_128_description, /* */
|
||||
&srtp_aes_icm_128_test_case_0, /* */
|
||||
SRTP_AES_ICM_128 /* */
|
||||
};
|
||||
|
||||
const srtp_cipher_type_t srtp_aes_icm_256 = {
|
||||
srtp_aes_icm_alloc, /* */
|
||||
srtp_aes_icm_dealloc, /* */
|
||||
srtp_aes_icm_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_encrypt, /* */
|
||||
srtp_aes_icm_encrypt, /* */
|
||||
srtp_aes_icm_set_iv, /* */
|
||||
srtp_aes_icm_256_description, /* */
|
||||
&srtp_aes_icm_256_test_case_0, /* */
|
||||
SRTP_AES_ICM_256 /* */
|
||||
};
|
||||
402
libsrtp/crypto/cipher/aes_icm_mbedtls.c
Normal file
402
libsrtp/crypto/cipher/aes_icm_mbedtls.c
Normal file
@@ -0,0 +1,402 @@
|
||||
/*
|
||||
* aes_icm_mbedtls.c
|
||||
*
|
||||
* AES Integer Counter Mode
|
||||
*
|
||||
* YongCheng Yang
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
#include <mbedtls/aes.h>
|
||||
#include "aes_icm_ext.h"
|
||||
#include "crypto_types.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_icm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes icm mbedtls" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* static function declarations.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen);
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_dealloc(srtp_cipher_t *c);
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_context_init(void *cv,
|
||||
const uint8_t *key);
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir);
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len);
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_icm_128_mbedtls_description[] =
|
||||
"AES-128 counter mode using mbedtls";
|
||||
static const char srtp_aes_icm_192_mbedtls_description[] =
|
||||
"AES-192 counter mode using mbedtls";
|
||||
static const char srtp_aes_icm_256_mbedtls_description[] =
|
||||
"AES-256 counter mode using mbedtls";
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_128 = {
|
||||
srtp_aes_icm_mbedtls_alloc, /* */
|
||||
srtp_aes_icm_mbedtls_dealloc, /* */
|
||||
srtp_aes_icm_mbedtls_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_set_iv, /* */
|
||||
srtp_aes_icm_128_mbedtls_description, /* */
|
||||
&srtp_aes_icm_128_test_case_0, /* */
|
||||
SRTP_AES_ICM_128 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_192 = {
|
||||
srtp_aes_icm_mbedtls_alloc, /* */
|
||||
srtp_aes_icm_mbedtls_dealloc, /* */
|
||||
srtp_aes_icm_mbedtls_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_set_iv, /* */
|
||||
srtp_aes_icm_192_mbedtls_description, /* */
|
||||
&srtp_aes_icm_192_test_case_0, /* */
|
||||
SRTP_AES_ICM_192 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_256 = {
|
||||
srtp_aes_icm_mbedtls_alloc, /* */
|
||||
srtp_aes_icm_mbedtls_dealloc, /* */
|
||||
srtp_aes_icm_mbedtls_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_encrypt, /* */
|
||||
srtp_aes_icm_mbedtls_set_iv, /* */
|
||||
srtp_aes_icm_256_mbedtls_description, /* */
|
||||
&srtp_aes_icm_256_test_case_0, /* */
|
||||
SRTP_AES_ICM_256 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* integer counter mode works as follows:
|
||||
*
|
||||
* https://tools.ietf.org/html/rfc3711#section-4.1.1
|
||||
*
|
||||
* E(k, IV) || E(k, IV + 1 mod 2^128) || E(k, IV + 2 mod 2^128) ...
|
||||
* IV = (k_s * 2^16) XOR (SSRC * 2^64) XOR (i * 2^16)
|
||||
*
|
||||
* IV SHALL be defined by the SSRC, the SRTP packet index i,
|
||||
* and the SRTP session salting key k_s.
|
||||
*
|
||||
* SSRC: 32bits.
|
||||
* Sequence number: 16bits.
|
||||
* nonce is 64bits. .
|
||||
* packet index = ROC || SEQ. (ROC: Rollover counter)
|
||||
*
|
||||
* 16 bits
|
||||
* <----->
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
* | nonce | packet index | ctr |---+
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ v
|
||||
* | salt |000000|->(+)
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +---------+
|
||||
* | encrypt |
|
||||
* +---------+
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* | keystream block |<--+
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
*
|
||||
* All fields are big-endian
|
||||
*
|
||||
* ctr is the block counter, which increments from zero for
|
||||
* each packet (16 bits wide)
|
||||
*
|
||||
* packet index is distinct for each packet (48 bits wide)
|
||||
*
|
||||
* nonce can be distinct across many uses of the same key, or
|
||||
* can be a fixed value per key, or can be per-packet randomness
|
||||
* (64 bits)
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 30, 38, or 46 for
|
||||
* AES-128, AES-192, and AES-256 respectively. Note, this key_len
|
||||
* value is inflated, as it also accounts for the 112 bit salt
|
||||
* value. The tlen argument is for the AEAD tag length, which
|
||||
* isn't used in counter mode.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *icm;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/192/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_ICM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_192_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_icm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm = (srtp_aes_icm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_icm_ctx_t));
|
||||
if (icm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm->ctx =
|
||||
(mbedtls_aes_context *)srtp_crypto_alloc(sizeof(mbedtls_aes_context));
|
||||
if (icm->ctx == NULL) {
|
||||
srtp_crypto_free(icm);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
mbedtls_aes_init(icm->ctx);
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = icm;
|
||||
|
||||
/* setup cipher parameters */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_ICM_128_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_128;
|
||||
(*c)->type = &srtp_aes_icm_128;
|
||||
icm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_192_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_192;
|
||||
(*c)->type = &srtp_aes_icm_192;
|
||||
icm->key_size = SRTP_AES_192_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_256_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_256;
|
||||
(*c)->type = &srtp_aes_icm_256;
|
||||
icm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates an instance of this engine
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *ctx;
|
||||
|
||||
if (c == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/*
|
||||
* Free the aes context
|
||||
*/
|
||||
ctx = (srtp_aes_icm_ctx_t *)c->state;
|
||||
if (ctx != NULL) {
|
||||
mbedtls_aes_free(ctx->ctx);
|
||||
srtp_crypto_free(ctx->ctx);
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_icm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
uint32_t key_size_in_bits = (c->key_size << 3);
|
||||
int errcode = 0;
|
||||
|
||||
/*
|
||||
* set counter and initial values to 'offset' value, being careful not to
|
||||
* go past the end of the key buffer
|
||||
*/
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
memcpy(&c->counter, key + c->key_size, SRTP_SALT_LEN);
|
||||
memcpy(&c->offset, key + c->key_size, SRTP_SALT_LEN);
|
||||
|
||||
/* force last two octets of the offset to zero (for srtp compatibility) */
|
||||
c->offset.v8[SRTP_SALT_LEN] = c->offset.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
c->counter.v8[SRTP_SALT_LEN] = c->counter.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
debug_print(srtp_mod_aes_icm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
debug_print(srtp_mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
|
||||
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
case SRTP_AES_192_KEY_LEN:
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
break;
|
||||
default:
|
||||
return srtp_err_status_bad_param;
|
||||
break;
|
||||
}
|
||||
|
||||
errcode = mbedtls_aes_setkey_enc(c->ctx, key, key_size_in_bits);
|
||||
if (errcode != 0) {
|
||||
debug_print(srtp_mod_aes_icm, "errCode: %d", errcode);
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
v128_t nonce;
|
||||
(void)dir;
|
||||
|
||||
c->nc_off = 0;
|
||||
/* set nonce (for alignment) */
|
||||
v128_copy_octet_string(&nonce, iv);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
|
||||
|
||||
v128_xor(&c->counter, &c->offset, &nonce);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "set_counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES CTR mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_mbedtls_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
|
||||
int errCode = 0;
|
||||
debug_print(srtp_mod_aes_icm, "rs0: %s", v128_hex_string(&c->counter));
|
||||
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
errCode =
|
||||
mbedtls_aes_crypt_ctr(c->ctx, src_len, &(c->nc_off), c->counter.v8,
|
||||
c->stream_block.v8, src, dst);
|
||||
if (errCode != 0) {
|
||||
debug_print(srtp_mod_aes_icm, "encrypt error: %d", errCode);
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
|
||||
*dst_len = src_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
415
libsrtp/crypto/cipher/aes_icm_nss.c
Normal file
415
libsrtp/crypto/cipher/aes_icm_nss.c
Normal file
@@ -0,0 +1,415 @@
|
||||
/*
|
||||
* aes_icm_nss.c
|
||||
*
|
||||
* AES Integer Counter Mode
|
||||
*
|
||||
* Richard L. Barnes
|
||||
* Cisco Systems, Inc.
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include "aes_icm_ext.h"
|
||||
#include "crypto_types.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_icm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes icm nss" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* integer counter mode works as follows:
|
||||
*
|
||||
* 16 bits
|
||||
* <----->
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
* | nonce | packet index | ctr |---+
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ v
|
||||
* | salt |000000|->(+)
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +---------+
|
||||
* | encrypt |
|
||||
* +---------+
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* | keystream block |<--+
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
*
|
||||
* All fields are big-endian
|
||||
*
|
||||
* ctr is the block counter, which increments from zero for
|
||||
* each packet (16 bits wide)
|
||||
*
|
||||
* packet index is distinct for each packet (48 bits wide)
|
||||
*
|
||||
* nonce can be distinct across many uses of the same key, or
|
||||
* can be a fixed value per key, or can be per-packet randomness
|
||||
* (64 bits)
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 30, 38, or 46 for
|
||||
* AES-128, AES-192, and AES-256 respectively. Note, this key_len
|
||||
* value is inflated, as it also accounts for the 112 bit salt
|
||||
* value. The tlen argument is for the AEAD tag length, which
|
||||
* isn't used in counter mode.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_nss_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *icm;
|
||||
NSSInitContext *nss;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/192/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_ICM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_192_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* Initialize NSS equiv of NSS_NoDB_Init(NULL) */
|
||||
nss = NSS_InitContext("", "", "", "", NULL,
|
||||
NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
|
||||
NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
|
||||
NSS_INIT_OPTIMIZESPACE);
|
||||
if (!nss) {
|
||||
return (srtp_err_status_cipher_fail);
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_icm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
NSS_ShutdownContext(nss);
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm = (srtp_aes_icm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_icm_ctx_t));
|
||||
if (icm == NULL) {
|
||||
NSS_ShutdownContext(nss);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm->key = NULL;
|
||||
icm->ctx = NULL;
|
||||
icm->nss = nss;
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = icm;
|
||||
|
||||
/* setup cipher parameters */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_ICM_128_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_128;
|
||||
(*c)->type = &srtp_aes_icm_128;
|
||||
icm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_192_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_192;
|
||||
(*c)->type = &srtp_aes_icm_192;
|
||||
icm->key_size = SRTP_AES_192_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_256_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_256;
|
||||
(*c)->type = &srtp_aes_icm_256;
|
||||
icm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates an instance of this engine
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_nss_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *ctx;
|
||||
|
||||
ctx = (srtp_aes_icm_ctx_t *)c->state;
|
||||
if (ctx) {
|
||||
/* free any PK11 values that have been created */
|
||||
if (ctx->key) {
|
||||
PK11_FreeSymKey(ctx->key);
|
||||
ctx->key = NULL;
|
||||
}
|
||||
|
||||
if (ctx->ctx) {
|
||||
PK11_DestroyContext(ctx->ctx, PR_TRUE);
|
||||
ctx->ctx = NULL;
|
||||
}
|
||||
|
||||
if (ctx->nss) {
|
||||
NSS_ShutdownContext(ctx->nss);
|
||||
ctx->nss = NULL;
|
||||
}
|
||||
|
||||
/* zeroize everything */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_icm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_nss_context_init(...) initializes the aes_icm_context
|
||||
* using the value in key[].
|
||||
*
|
||||
* the key is the secret key
|
||||
*
|
||||
* the salt is unpredictable (but not necessarily secret) data which
|
||||
* randomizes the starting point in the keystream
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_nss_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
|
||||
/*
|
||||
* set counter and initial values to 'offset' value, being careful not to
|
||||
* go past the end of the key buffer
|
||||
*/
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
memcpy(&c->counter, key + c->key_size, SRTP_SALT_LEN);
|
||||
memcpy(&c->offset, key + c->key_size, SRTP_SALT_LEN);
|
||||
|
||||
/* force last two octets of the offset to zero (for srtp compatibility) */
|
||||
c->offset.v8[SRTP_SALT_LEN] = c->offset.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
c->counter.v8[SRTP_SALT_LEN] = c->counter.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
debug_print(srtp_mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
|
||||
|
||||
if (c->key) {
|
||||
PK11_FreeSymKey(c->key);
|
||||
c->key = NULL;
|
||||
}
|
||||
|
||||
PK11SlotInfo *slot = PK11_GetBestSlot(CKM_AES_CTR, NULL);
|
||||
if (!slot) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* explicitly cast away const of key */
|
||||
SECItem keyItem = { siBuffer, (unsigned char *)(uintptr_t)key,
|
||||
c->key_size };
|
||||
c->key = PK11_ImportSymKey(slot, CKM_AES_CTR, PK11_OriginUnwrap,
|
||||
CKA_ENCRYPT, &keyItem, NULL);
|
||||
PK11_FreeSlot(slot);
|
||||
|
||||
if (!c->key) {
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
|
||||
return (srtp_err_status_ok);
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_nss_set_iv(void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
v128_t nonce;
|
||||
(void)dir;
|
||||
|
||||
/* set nonce (for alignment) */
|
||||
v128_copy_octet_string(&nonce, iv);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
|
||||
|
||||
v128_xor(&c->counter, &c->offset, &nonce);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "set_counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
|
||||
/* set up the PK11 context now that we have all the info */
|
||||
CK_AES_CTR_PARAMS param;
|
||||
param.ulCounterBits = 16;
|
||||
memcpy(param.cb, &c->counter, 16);
|
||||
|
||||
if (!c->key) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (c->ctx) {
|
||||
PK11_DestroyContext(c->ctx, PR_TRUE);
|
||||
}
|
||||
|
||||
SECItem paramItem = { siBuffer, (unsigned char *)¶m,
|
||||
sizeof(CK_AES_CTR_PARAMS) };
|
||||
c->ctx = PK11_CreateContextBySymKey(CKM_AES_CTR, CKA_ENCRYPT, c->key,
|
||||
¶mItem);
|
||||
if (!c->ctx) {
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES CTR mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_nss_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
|
||||
if (!c->ctx) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (dst_len == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
int out_len = 0;
|
||||
int rv = PK11_CipherOp(c->ctx, dst, &out_len, *dst_len, src, src_len);
|
||||
*dst_len = out_len;
|
||||
srtp_err_status_t status = srtp_err_status_ok;
|
||||
if (rv != SECSuccess) {
|
||||
status = srtp_err_status_cipher_fail;
|
||||
}
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_icm_128_nss_description[] =
|
||||
"AES-128 counter mode using NSS";
|
||||
static const char srtp_aes_icm_192_nss_description[] =
|
||||
"AES-192 counter mode using NSS";
|
||||
static const char srtp_aes_icm_256_nss_description[] =
|
||||
"AES-256 counter mode using NSS";
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_128 = {
|
||||
srtp_aes_icm_nss_alloc, /* */
|
||||
srtp_aes_icm_nss_dealloc, /* */
|
||||
srtp_aes_icm_nss_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_set_iv, /* */
|
||||
srtp_aes_icm_128_nss_description, /* */
|
||||
&srtp_aes_icm_128_test_case_0, /* */
|
||||
SRTP_AES_ICM_128 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_192 = {
|
||||
srtp_aes_icm_nss_alloc, /* */
|
||||
srtp_aes_icm_nss_dealloc, /* */
|
||||
srtp_aes_icm_nss_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_set_iv, /* */
|
||||
srtp_aes_icm_192_nss_description, /* */
|
||||
&srtp_aes_icm_192_test_case_0, /* */
|
||||
SRTP_AES_ICM_192 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_256 = {
|
||||
srtp_aes_icm_nss_alloc, /* */
|
||||
srtp_aes_icm_nss_dealloc, /* */
|
||||
srtp_aes_icm_nss_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_encrypt, /* */
|
||||
srtp_aes_icm_nss_set_iv, /* */
|
||||
srtp_aes_icm_256_nss_description, /* */
|
||||
&srtp_aes_icm_256_test_case_0, /* */
|
||||
SRTP_AES_ICM_256 /* */
|
||||
};
|
||||
391
libsrtp/crypto/cipher/aes_icm_ossl.c
Normal file
391
libsrtp/crypto/cipher/aes_icm_ossl.c
Normal file
@@ -0,0 +1,391 @@
|
||||
/*
|
||||
* aes_icm_ossl.c
|
||||
*
|
||||
* AES Integer Counter Mode
|
||||
*
|
||||
* John A. Foley
|
||||
* Cisco Systems, Inc.
|
||||
*
|
||||
* 2/24/2012: This module was modified to use CiscoSSL for AES counter
|
||||
* mode. Eddy Lem contributed the code to allow this.
|
||||
*
|
||||
* 12/20/2012: Added support for AES-192 and AES-256.
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include <openssl/evp.h>
|
||||
#include "aes_icm_ext.h"
|
||||
#include "crypto_types.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_icm = {
|
||||
false, /* debugging is off by default */
|
||||
"aes icm ossl" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* integer counter mode works as follows:
|
||||
*
|
||||
* 16 bits
|
||||
* <----->
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
* | nonce | packet index | ctr |---+
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ v
|
||||
* | salt |000000|->(+)
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +---------+
|
||||
* | encrypt |
|
||||
* +---------+
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* | keystream block |<--+
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
*
|
||||
* All fields are big-endian
|
||||
*
|
||||
* ctr is the block counter, which increments from zero for
|
||||
* each packet (16 bits wide)
|
||||
*
|
||||
* packet index is distinct for each packet (48 bits wide)
|
||||
*
|
||||
* nonce can be distinct across many uses of the same key, or
|
||||
* can be a fixed value per key, or can be per-packet randomness
|
||||
* (64 bits)
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 30, 38, or 46 for
|
||||
* AES-128, AES-192, and AES-256 respectively. Note, this key_len
|
||||
* value is inflated, as it also accounts for the 112 bit salt
|
||||
* value. The tlen argument is for the AEAD tag length, which
|
||||
* isn't used in counter mode.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_openssl_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *icm;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/192/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_ICM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_192_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_icm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm = (srtp_aes_icm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_icm_ctx_t));
|
||||
if (icm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm->ctx = EVP_CIPHER_CTX_new();
|
||||
if (icm->ctx == NULL) {
|
||||
srtp_crypto_free(icm);
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
/* set pointers */
|
||||
(*c)->state = icm;
|
||||
|
||||
/* setup cipher parameters */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_ICM_128_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_128;
|
||||
(*c)->type = &srtp_aes_icm_128;
|
||||
icm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_192_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_192;
|
||||
(*c)->type = &srtp_aes_icm_192;
|
||||
icm->key_size = SRTP_AES_192_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_256_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_256;
|
||||
(*c)->type = &srtp_aes_icm_256;
|
||||
icm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates an instance of this engine
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_openssl_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *ctx;
|
||||
|
||||
if (c == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/*
|
||||
* Free the EVP context
|
||||
*/
|
||||
ctx = (srtp_aes_icm_ctx_t *)c->state;
|
||||
if (ctx != NULL) {
|
||||
EVP_CIPHER_CTX_free(ctx->ctx);
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_icm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_openssl_context_init(...) initializes the aes_icm_context
|
||||
* using the value in key[].
|
||||
*
|
||||
* the key is the secret key
|
||||
*
|
||||
* the salt is unpredictable (but not necessarily secret) data which
|
||||
* randomizes the starting point in the keystream
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_openssl_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
const EVP_CIPHER *evp;
|
||||
|
||||
/*
|
||||
* set counter and initial values to 'offset' value, being careful not to
|
||||
* go past the end of the key buffer
|
||||
*/
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
memcpy(&c->counter, key + c->key_size, SRTP_SALT_LEN);
|
||||
memcpy(&c->offset, key + c->key_size, SRTP_SALT_LEN);
|
||||
|
||||
/* force last two octets of the offset to zero (for srtp compatibility) */
|
||||
c->offset.v8[SRTP_SALT_LEN] = c->offset.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
c->counter.v8[SRTP_SALT_LEN] = c->counter.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
debug_print(srtp_mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
|
||||
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
evp = EVP_aes_256_ctr();
|
||||
break;
|
||||
case SRTP_AES_192_KEY_LEN:
|
||||
evp = EVP_aes_192_ctr();
|
||||
break;
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
evp = EVP_aes_128_ctr();
|
||||
break;
|
||||
default:
|
||||
return srtp_err_status_bad_param;
|
||||
break;
|
||||
}
|
||||
|
||||
EVP_CIPHER_CTX_reset(c->ctx);
|
||||
|
||||
if (!EVP_EncryptInit_ex(c->ctx, evp, NULL, key, NULL)) {
|
||||
return srtp_err_status_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_openssl_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
v128_t nonce;
|
||||
(void)dir;
|
||||
|
||||
/* set nonce (for alignment) */
|
||||
v128_copy_octet_string(&nonce, iv);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
|
||||
|
||||
v128_xor(&c->counter, &c->offset, &nonce);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "set_counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
|
||||
if (!EVP_EncryptInit_ex(c->ctx, NULL, NULL, NULL, c->counter.v8)) {
|
||||
return srtp_err_status_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES CTR mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_openssl_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
int len = 0;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "rs0: %s", v128_hex_string(&c->counter));
|
||||
|
||||
if (dst_len == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
if (!EVP_EncryptUpdate(c->ctx, dst, &len, src, src_len)) {
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
*dst_len = len;
|
||||
|
||||
if (!EVP_EncryptFinal_ex(c->ctx, dst + len, &len)) {
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
*dst_len += len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_icm_128_openssl_description[] =
|
||||
"AES-128 counter mode using openssl";
|
||||
static const char srtp_aes_icm_192_openssl_description[] =
|
||||
"AES-192 counter mode using openssl";
|
||||
static const char srtp_aes_icm_256_openssl_description[] =
|
||||
"AES-256 counter mode using openssl";
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_128 = {
|
||||
srtp_aes_icm_openssl_alloc, /* */
|
||||
srtp_aes_icm_openssl_dealloc, /* */
|
||||
srtp_aes_icm_openssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_set_iv, /* */
|
||||
srtp_aes_icm_128_openssl_description, /* */
|
||||
&srtp_aes_icm_128_test_case_0, /* */
|
||||
SRTP_AES_ICM_128 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_192 = {
|
||||
srtp_aes_icm_openssl_alloc, /* */
|
||||
srtp_aes_icm_openssl_dealloc, /* */
|
||||
srtp_aes_icm_openssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_set_iv, /* */
|
||||
srtp_aes_icm_192_openssl_description, /* */
|
||||
&srtp_aes_icm_192_test_case_0, /* */
|
||||
SRTP_AES_ICM_192 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_256 = {
|
||||
srtp_aes_icm_openssl_alloc, /* */
|
||||
srtp_aes_icm_openssl_dealloc, /* */
|
||||
srtp_aes_icm_openssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_encrypt, /* */
|
||||
srtp_aes_icm_openssl_set_iv, /* */
|
||||
srtp_aes_icm_256_openssl_description, /* */
|
||||
&srtp_aes_icm_256_test_case_0, /* */
|
||||
SRTP_AES_ICM_256 /* */
|
||||
};
|
||||
398
libsrtp/crypto/cipher/aes_icm_wssl.c
Normal file
398
libsrtp/crypto/cipher/aes_icm_wssl.c
Normal file
@@ -0,0 +1,398 @@
|
||||
/*
|
||||
* aes_icm_wssl.c
|
||||
*
|
||||
* AES Integer Counter Mode using wolfSSL
|
||||
*
|
||||
* Sean Parkinson, wolfSSL
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2017, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
#ifndef WOLFSSL_USER_SETTINGS
|
||||
#include <wolfssl/options.h>
|
||||
#endif
|
||||
#include <wolfssl/wolfcrypt/settings.h>
|
||||
#include <wolfssl/wolfcrypt/aes.h>
|
||||
#include "aes_icm_ext.h"
|
||||
#include "crypto_types.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
#include "cipher_test_cases.h"
|
||||
|
||||
srtp_debug_module_t srtp_mod_aes_icm = {
|
||||
0, /* debugging is off by default */
|
||||
"aes icm wssl" /* printable module name */
|
||||
};
|
||||
|
||||
/*
|
||||
* integer counter mode works as follows:
|
||||
*
|
||||
* https://tools.ietf.org/html/rfc3711#section-4.1.1
|
||||
*
|
||||
* E(k, IV) || E(k, IV + 1 mod 2^128) || E(k, IV + 2 mod 2^128) ...
|
||||
* IV = (k_s * 2^16) XOR (SSRC * 2^64) XOR (i * 2^16)
|
||||
*
|
||||
* IV SHALL be defined by the SSRC, the SRTP packet index i,
|
||||
* and the SRTP session salting key k_s.
|
||||
*
|
||||
* SSRC: 32bits.
|
||||
* Sequence number: 16bits.
|
||||
* nonce is 64bits. .
|
||||
* packet index = ROC || SEQ. (ROC: Rollover counter)
|
||||
*
|
||||
* 16 bits
|
||||
* <----->
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
* | nonce | packet index | ctr |---+
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ v
|
||||
* | salt |000000|->(+)
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* |
|
||||
* +---------+
|
||||
* | encrypt |
|
||||
* +---------+
|
||||
* |
|
||||
* +------+------+------+------+------+------+------+------+ |
|
||||
* | keystream block |<--+
|
||||
* +------+------+------+------+------+------+------+------+
|
||||
*
|
||||
* All fields are big-endian
|
||||
*
|
||||
* ctr is the block counter, which increments from zero for
|
||||
* each packet (16 bits wide)
|
||||
*
|
||||
* packet index is distinct for each packet (48 bits wide)
|
||||
*
|
||||
* nonce can be distinct across many uses of the same key, or
|
||||
* can be a fixed value per key, or can be per-packet randomness
|
||||
* (64 bits)
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
* This function allocates a new instance of this crypto engine.
|
||||
* The key_len parameter should be one of 30, 38, or 46 for
|
||||
* AES-128, AES-192, and AES-256 respectively. Note, this key_len
|
||||
* value is inflated, as it also accounts for the 112 bit salt
|
||||
* value. The tlen argument is for the AEAD tag length, which
|
||||
* isn't used in counter mode.
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_wolfssl_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *icm;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/*
|
||||
* Verify the key_len is valid for one of: AES-128/192/256
|
||||
*/
|
||||
if (key_len != SRTP_AES_ICM_128_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_192_KEY_LEN_WSALT &&
|
||||
key_len != SRTP_AES_ICM_256_KEY_LEN_WSALT) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/* allocate memory a cipher of type aes_icm */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
icm = (srtp_aes_icm_ctx_t *)srtp_crypto_alloc(sizeof(srtp_aes_icm_ctx_t));
|
||||
if (icm == NULL) {
|
||||
srtp_crypto_free(*c);
|
||||
*c = NULL;
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
icm->ctx = NULL;
|
||||
|
||||
(*c)->state = icm;
|
||||
|
||||
/* setup cipher parameters */
|
||||
switch (key_len) {
|
||||
case SRTP_AES_ICM_128_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_128;
|
||||
(*c)->type = &srtp_aes_icm_128;
|
||||
icm->key_size = SRTP_AES_128_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_192_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_192;
|
||||
(*c)->type = &srtp_aes_icm_192;
|
||||
icm->key_size = SRTP_AES_192_KEY_LEN;
|
||||
break;
|
||||
case SRTP_AES_ICM_256_KEY_LEN_WSALT:
|
||||
(*c)->algorithm = SRTP_AES_ICM_256;
|
||||
(*c)->type = &srtp_aes_icm_256;
|
||||
icm->key_size = SRTP_AES_256_KEY_LEN;
|
||||
break;
|
||||
}
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function deallocates an instance of this engine
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_wolfssl_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *ctx;
|
||||
|
||||
if (c == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
/*
|
||||
* Free the aes context
|
||||
*/
|
||||
ctx = (srtp_aes_icm_ctx_t *)c->state;
|
||||
if (ctx != NULL) {
|
||||
if (ctx->ctx != NULL) {
|
||||
wc_AesFree(ctx->ctx);
|
||||
srtp_crypto_free(ctx->ctx);
|
||||
}
|
||||
/* zeroize the key material */
|
||||
octet_string_set_to_zero(ctx, sizeof(srtp_aes_icm_ctx_t));
|
||||
srtp_crypto_free(ctx);
|
||||
}
|
||||
|
||||
/* free memory */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_aes_icm_wolfssl_context_init(void *cv,
|
||||
const uint8_t *key)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
int err;
|
||||
|
||||
if (c->ctx == NULL) {
|
||||
c->ctx = (Aes *)srtp_crypto_alloc(sizeof(Aes));
|
||||
if (c->ctx == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
err = wc_AesInit(c->ctx, NULL, INVALID_DEVID);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_icm, "wolfSSL error code: %d", err);
|
||||
srtp_crypto_free(c->ctx);
|
||||
c->ctx = NULL;
|
||||
return srtp_err_status_init_fail;
|
||||
}
|
||||
}
|
||||
|
||||
/* set pointers */
|
||||
/*
|
||||
* set counter and initial values to 'offset' value, being careful not to
|
||||
* go past the end of the key buffer
|
||||
*/
|
||||
v128_set_to_zero(&c->counter);
|
||||
v128_set_to_zero(&c->offset);
|
||||
memcpy(&c->counter, key + c->key_size, SRTP_SALT_LEN);
|
||||
memcpy(&c->offset, key + c->key_size, SRTP_SALT_LEN);
|
||||
|
||||
/* force last two octets of the offset to zero (for srtp compatibility) */
|
||||
c->offset.v8[SRTP_SALT_LEN] = c->offset.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
c->counter.v8[SRTP_SALT_LEN] = c->counter.v8[SRTP_SALT_LEN + 1] = 0;
|
||||
debug_print(srtp_mod_aes_icm, "key: %s",
|
||||
srtp_octet_string_hex_string(key, c->key_size));
|
||||
debug_print(srtp_mod_aes_icm, "offset: %s", v128_hex_string(&c->offset));
|
||||
|
||||
switch (c->key_size) {
|
||||
case SRTP_AES_256_KEY_LEN:
|
||||
case SRTP_AES_192_KEY_LEN:
|
||||
case SRTP_AES_128_KEY_LEN:
|
||||
break;
|
||||
default:
|
||||
return srtp_err_status_bad_param;
|
||||
break;
|
||||
}
|
||||
|
||||
/* Counter mode always encrypts. */
|
||||
err = wc_AesSetKey(c->ctx, key, c->key_size, NULL, AES_ENCRYPTION);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_icm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with
|
||||
* the offset
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_wolfssl_set_iv(
|
||||
void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
v128_t nonce;
|
||||
int err;
|
||||
(void)dir;
|
||||
|
||||
/* set nonce (for alignment) */
|
||||
v128_copy_octet_string(&nonce, iv);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "setting iv: %s", v128_hex_string(&nonce));
|
||||
|
||||
v128_xor(&c->counter, &c->offset, &nonce);
|
||||
|
||||
debug_print(srtp_mod_aes_icm, "set_counter: %s",
|
||||
v128_hex_string(&c->counter));
|
||||
|
||||
err = wc_AesSetIV(c->ctx, c->counter.v8);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_icm, "wolfSSL error code: %d", err);
|
||||
return srtp_err_status_fail;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* This function encrypts a buffer using AES CTR mode
|
||||
*
|
||||
* Parameters:
|
||||
* c Crypto context
|
||||
* buf data to encrypt
|
||||
* enc_len length of encrypt buffer
|
||||
*/
|
||||
static srtp_err_status_t srtp_aes_icm_wolfssl_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
|
||||
|
||||
int err;
|
||||
debug_print(srtp_mod_aes_icm, "rs0: %s", v128_hex_string(&c->counter));
|
||||
|
||||
if (dst_len == NULL) {
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
|
||||
err = wc_AesCtrEncrypt(c->ctx, dst, src, src_len);
|
||||
if (err < 0) {
|
||||
debug_print(srtp_mod_aes_icm, "wolfSSL encrypt error: %d", err);
|
||||
return srtp_err_status_cipher_fail;
|
||||
}
|
||||
*dst_len = src_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* Name of this crypto engine
|
||||
*/
|
||||
static const char srtp_aes_icm_128_wolfssl_description[] =
|
||||
"AES-128 counter mode using wolfSSL";
|
||||
static const char srtp_aes_icm_192_wolfssl_description[] =
|
||||
"AES-192 counter mode using wolfSSL";
|
||||
static const char srtp_aes_icm_256_wolfssl_description[] =
|
||||
"AES-256 counter mode using wolfSSL";
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_128 = {
|
||||
srtp_aes_icm_wolfssl_alloc, /* */
|
||||
srtp_aes_icm_wolfssl_dealloc, /* */
|
||||
srtp_aes_icm_wolfssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_set_iv, /* */
|
||||
srtp_aes_icm_128_wolfssl_description, /* */
|
||||
&srtp_aes_icm_128_test_case_0, /* */
|
||||
SRTP_AES_ICM_128 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_192 = {
|
||||
srtp_aes_icm_wolfssl_alloc, /* */
|
||||
srtp_aes_icm_wolfssl_dealloc, /* */
|
||||
srtp_aes_icm_wolfssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_set_iv, /* */
|
||||
srtp_aes_icm_192_wolfssl_description, /* */
|
||||
&srtp_aes_icm_192_test_case_0, /* */
|
||||
SRTP_AES_ICM_192 /* */
|
||||
};
|
||||
|
||||
/*
|
||||
* This is the function table for this crypto engine.
|
||||
* note: the encrypt function is identical to the decrypt function
|
||||
*/
|
||||
const srtp_cipher_type_t srtp_aes_icm_256 = {
|
||||
srtp_aes_icm_wolfssl_alloc, /* */
|
||||
srtp_aes_icm_wolfssl_dealloc, /* */
|
||||
srtp_aes_icm_wolfssl_context_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_encrypt, /* */
|
||||
srtp_aes_icm_wolfssl_set_iv, /* */
|
||||
srtp_aes_icm_256_wolfssl_description, /* */
|
||||
&srtp_aes_icm_256_test_case_0, /* */
|
||||
SRTP_AES_ICM_256 /* */
|
||||
};
|
||||
652
libsrtp/crypto/cipher/cipher.c
Normal file
652
libsrtp/crypto/cipher/cipher.c
Normal file
@@ -0,0 +1,652 @@
|
||||
/*
|
||||
* cipher.c
|
||||
*
|
||||
* cipher meta-functions
|
||||
*
|
||||
* David A. McGrew
|
||||
* Cisco Systems, Inc.
|
||||
*
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2001-2017 Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include "cipher.h"
|
||||
#include "cipher_priv.h"
|
||||
#include "crypto_types.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h" /* for crypto_alloc(), crypto_free() */
|
||||
|
||||
#include <stdlib.h>
|
||||
|
||||
srtp_debug_module_t srtp_mod_cipher = {
|
||||
false, /* debugging is off by default */
|
||||
"cipher" /* printable module name */
|
||||
};
|
||||
|
||||
srtp_err_status_t srtp_cipher_type_alloc(const srtp_cipher_type_t *ct,
|
||||
srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
if (!ct || !ct->alloc) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
return ((ct)->alloc((c), (key_len), (tlen)));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
if (!c || !c->type) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
return (((c)->type)->dealloc(c));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_init(srtp_cipher_t *c, const uint8_t *key)
|
||||
{
|
||||
if (!c || !c->type || !c->state) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
return (((c)->type)->init(((c)->state), (key)));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_set_iv(srtp_cipher_t *c,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t direction)
|
||||
{
|
||||
if (!c || !c->type || !c->state) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
return (((c)->type)->set_iv(((c)->state), iv, direction));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_output(srtp_cipher_t *c,
|
||||
uint8_t *buffer,
|
||||
size_t *num_octets_to_output)
|
||||
{
|
||||
/* zeroize the buffer */
|
||||
octet_string_set_to_zero(buffer, *num_octets_to_output);
|
||||
|
||||
/* exor keystream into buffer */
|
||||
return (((c)->type)->encrypt(((c)->state), buffer, *num_octets_to_output,
|
||||
buffer, num_octets_to_output));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_encrypt(srtp_cipher_t *c,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
if (!c || !c->type || !c->state) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
return (((c)->type)->encrypt(((c)->state), src, src_len, dst, dst_len));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_decrypt(srtp_cipher_t *c,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
if (!c || !c->type || !c->state) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
|
||||
return (((c)->type)->decrypt(((c)->state), src, src_len, dst, dst_len));
|
||||
}
|
||||
|
||||
srtp_err_status_t srtp_cipher_set_aad(srtp_cipher_t *c,
|
||||
const uint8_t *aad,
|
||||
size_t aad_len)
|
||||
{
|
||||
if (!c || !c->type || !c->state) {
|
||||
return (srtp_err_status_bad_param);
|
||||
}
|
||||
if (!((c)->type)->set_aad) {
|
||||
return (srtp_err_status_no_such_op);
|
||||
}
|
||||
|
||||
return (((c)->type)->set_aad(((c)->state), aad, aad_len));
|
||||
}
|
||||
|
||||
/* some bookkeeping functions */
|
||||
|
||||
size_t srtp_cipher_get_key_length(const srtp_cipher_t *c)
|
||||
{
|
||||
return c->key_len;
|
||||
}
|
||||
|
||||
/*
|
||||
* A trivial platform independent random source.
|
||||
* For use in test only.
|
||||
*/
|
||||
void srtp_cipher_rand_for_tests(uint8_t *dest, size_t len)
|
||||
{
|
||||
/* Generic C-library (rand()) version */
|
||||
/* This is a random source of last resort */
|
||||
while (len) {
|
||||
int val = rand();
|
||||
/* rand() returns 0-32767 (ugh) */
|
||||
/* Is this a good enough way to get random bytes?
|
||||
It is if it passes FIPS-140... */
|
||||
*dest++ = val & 0xff;
|
||||
len--;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A trivial platform independent 32 bit random number.
|
||||
* For use in test only.
|
||||
*/
|
||||
uint32_t srtp_cipher_rand_u32_for_tests(void)
|
||||
{
|
||||
uint32_t r;
|
||||
srtp_cipher_rand_for_tests((uint8_t *)&r, sizeof(r));
|
||||
return r;
|
||||
}
|
||||
|
||||
#define SELF_TEST_BUF_OCTETS 128
|
||||
#define NUM_RAND_TESTS 128
|
||||
#define MAX_KEY_LEN 64
|
||||
/*
|
||||
* srtp_cipher_type_test(ct, test_data) tests a cipher of type ct against
|
||||
* test cases provided in a list test_data of values of key, salt, iv,
|
||||
* plaintext, and ciphertext that is known to be good
|
||||
*/
|
||||
srtp_err_status_t srtp_cipher_type_test(
|
||||
const srtp_cipher_type_t *ct,
|
||||
const srtp_cipher_test_case_t *test_data)
|
||||
{
|
||||
return srtp_err_status_ok;
|
||||
const srtp_cipher_test_case_t *test_case = test_data;
|
||||
srtp_cipher_t *c;
|
||||
srtp_err_status_t status;
|
||||
uint8_t buffer[SELF_TEST_BUF_OCTETS];
|
||||
uint8_t buffer2[SELF_TEST_BUF_OCTETS];
|
||||
size_t len;
|
||||
size_t case_num = 0;
|
||||
|
||||
debug_print(srtp_mod_cipher, "running self-test for cipher %s",
|
||||
ct->description);
|
||||
|
||||
/*
|
||||
* check to make sure that we have at least one test case, and
|
||||
* return an error if we don't - we need to be paranoid here
|
||||
*/
|
||||
if (test_case == NULL) {
|
||||
return srtp_err_status_cant_check;
|
||||
}
|
||||
|
||||
/*
|
||||
* loop over all test cases, perform known-answer tests of both the
|
||||
* encryption and decryption functions
|
||||
*/
|
||||
while (test_case != NULL) {
|
||||
/* allocate cipher */
|
||||
status = srtp_cipher_type_alloc(ct, &c, test_case->key_length_octets,
|
||||
test_case->tag_length_octets);
|
||||
if (status) {
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* test the encrypt function
|
||||
*/
|
||||
debug_print0(srtp_mod_cipher, "testing encryption");
|
||||
|
||||
/* initialize cipher */
|
||||
status = srtp_cipher_init(c, test_case->key);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* copy plaintext into test buffer */
|
||||
if (test_case->ciphertext_length_octets > SELF_TEST_BUF_OCTETS) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
for (size_t k = 0; k < test_case->plaintext_length_octets; k++) {
|
||||
buffer[k] = test_case->plaintext[k];
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "plaintext: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, test_case->plaintext_length_octets));
|
||||
|
||||
/* set the initialization vector */
|
||||
status = srtp_cipher_set_iv(c, test_case->idx, srtp_direction_encrypt);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
if (c->algorithm == SRTP_AES_GCM_128 ||
|
||||
c->algorithm == SRTP_AES_GCM_256) {
|
||||
debug_print(srtp_mod_cipher, "IV: %s",
|
||||
srtp_octet_string_hex_string(test_case->idx, 12));
|
||||
|
||||
/*
|
||||
* Set the AAD
|
||||
*/
|
||||
status = srtp_cipher_set_aad(c, test_case->aad,
|
||||
test_case->aad_length_octets);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
debug_print(srtp_mod_cipher, "AAD: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->aad, test_case->aad_length_octets));
|
||||
}
|
||||
|
||||
/* encrypt */
|
||||
len = sizeof(buffer);
|
||||
status = srtp_cipher_encrypt(
|
||||
c, buffer, test_case->plaintext_length_octets, buffer, &len);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "ciphertext: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, test_case->ciphertext_length_octets));
|
||||
|
||||
/* compare the resulting ciphertext with that in the test case */
|
||||
if (len != test_case->ciphertext_length_octets) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
status = srtp_err_status_ok;
|
||||
for (size_t k = 0; k < test_case->ciphertext_length_octets; k++) {
|
||||
if (buffer[k] != test_case->ciphertext[k]) {
|
||||
status = srtp_err_status_algo_fail;
|
||||
debug_print(srtp_mod_cipher, "test case %zu failed", case_num);
|
||||
debug_print(srtp_mod_cipher, "(failure at byte %zu)", k);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (status) {
|
||||
debug_print(srtp_mod_cipher, "c computed: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, 2 * test_case->plaintext_length_octets));
|
||||
debug_print(srtp_mod_cipher, "c expected: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->ciphertext,
|
||||
2 * test_case->plaintext_length_octets));
|
||||
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
|
||||
/*
|
||||
* test the decrypt function
|
||||
*/
|
||||
debug_print0(srtp_mod_cipher, "testing decryption");
|
||||
|
||||
/* re-initialize cipher for decryption */
|
||||
status = srtp_cipher_init(c, test_case->key);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* copy ciphertext into test buffer */
|
||||
if (test_case->ciphertext_length_octets > SELF_TEST_BUF_OCTETS) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_bad_param;
|
||||
}
|
||||
for (size_t k = 0; k < test_case->ciphertext_length_octets; k++) {
|
||||
buffer[k] = test_case->ciphertext[k];
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "ciphertext: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, test_case->plaintext_length_octets));
|
||||
|
||||
/* set the initialization vector */
|
||||
status = srtp_cipher_set_iv(c, test_case->idx, srtp_direction_decrypt);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
if (c->algorithm == SRTP_AES_GCM_128 ||
|
||||
c->algorithm == SRTP_AES_GCM_256) {
|
||||
/*
|
||||
* Set the AAD
|
||||
*/
|
||||
status = srtp_cipher_set_aad(c, test_case->aad,
|
||||
test_case->aad_length_octets);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
debug_print(srtp_mod_cipher, "AAD: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->aad, test_case->aad_length_octets));
|
||||
}
|
||||
|
||||
/* decrypt */
|
||||
len = sizeof(buffer);
|
||||
status = srtp_cipher_decrypt(
|
||||
c, buffer, test_case->ciphertext_length_octets, buffer, &len);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "plaintext: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, test_case->plaintext_length_octets));
|
||||
|
||||
/* compare the resulting plaintext with that in the test case */
|
||||
if (len != test_case->plaintext_length_octets) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
status = srtp_err_status_ok;
|
||||
for (size_t k = 0; k < test_case->plaintext_length_octets; k++) {
|
||||
if (buffer[k] != test_case->plaintext[k]) {
|
||||
status = srtp_err_status_algo_fail;
|
||||
debug_print(srtp_mod_cipher, "test case %zu failed", case_num);
|
||||
debug_print(srtp_mod_cipher, "(failure at byte %zu)", k);
|
||||
}
|
||||
}
|
||||
if (status) {
|
||||
debug_print(srtp_mod_cipher, "p computed: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
buffer, 2 * test_case->plaintext_length_octets));
|
||||
debug_print(srtp_mod_cipher, "p expected: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->plaintext,
|
||||
2 * test_case->plaintext_length_octets));
|
||||
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
|
||||
/* deallocate the cipher */
|
||||
status = srtp_cipher_dealloc(c);
|
||||
if (status) {
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* the cipher passed the test case, so move on to the next test
|
||||
* case in the list; if NULL, we'l proceed to the next test
|
||||
*/
|
||||
test_case = test_case->next_test_case;
|
||||
++case_num;
|
||||
}
|
||||
|
||||
/* now run some random invertibility tests */
|
||||
|
||||
/* allocate cipher, using paramaters from the first test case */
|
||||
test_case = test_data;
|
||||
status = srtp_cipher_type_alloc(ct, &c, test_case->key_length_octets,
|
||||
test_case->tag_length_octets);
|
||||
if (status) {
|
||||
return status;
|
||||
}
|
||||
|
||||
for (size_t j = 0; j < NUM_RAND_TESTS; j++) {
|
||||
size_t plaintext_len;
|
||||
size_t encrypted_len;
|
||||
size_t decrypted_len;
|
||||
uint8_t key[MAX_KEY_LEN];
|
||||
uint8_t iv[MAX_KEY_LEN];
|
||||
|
||||
/* choose a length at random (leaving room for IV and padding) */
|
||||
plaintext_len =
|
||||
srtp_cipher_rand_u32_for_tests() % (SELF_TEST_BUF_OCTETS - 64);
|
||||
debug_print(srtp_mod_cipher, "random plaintext length %zu\n",
|
||||
plaintext_len);
|
||||
srtp_cipher_rand_for_tests(buffer, plaintext_len);
|
||||
|
||||
debug_print(srtp_mod_cipher, "plaintext: %s",
|
||||
srtp_octet_string_hex_string(buffer, plaintext_len));
|
||||
|
||||
/* copy plaintext into second buffer */
|
||||
for (size_t i = 0; i < plaintext_len; i++) {
|
||||
buffer2[i] = buffer[i];
|
||||
}
|
||||
|
||||
/* choose a key at random */
|
||||
if (test_case->key_length_octets > MAX_KEY_LEN) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_cant_check;
|
||||
}
|
||||
srtp_cipher_rand_for_tests(key, test_case->key_length_octets);
|
||||
|
||||
/* chose a random initialization vector */
|
||||
srtp_cipher_rand_for_tests(iv, MAX_KEY_LEN);
|
||||
|
||||
/* initialize cipher */
|
||||
status = srtp_cipher_init(c, key);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
/* set initialization vector */
|
||||
status = srtp_cipher_set_iv(c, test_case->idx, srtp_direction_encrypt);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
if (c->algorithm == SRTP_AES_GCM_128 ||
|
||||
c->algorithm == SRTP_AES_GCM_256) {
|
||||
/*
|
||||
* Set the AAD
|
||||
*/
|
||||
status = srtp_cipher_set_aad(c, test_case->aad,
|
||||
test_case->aad_length_octets);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
debug_print(srtp_mod_cipher, "AAD: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->aad, test_case->aad_length_octets));
|
||||
}
|
||||
|
||||
/* encrypt buffer with cipher */
|
||||
encrypted_len = sizeof(buffer);
|
||||
status = srtp_cipher_encrypt(c, buffer, plaintext_len, buffer,
|
||||
&encrypted_len);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "ciphertext: %s",
|
||||
srtp_octet_string_hex_string(buffer, encrypted_len));
|
||||
|
||||
/*
|
||||
* re-initialize cipher for decryption, re-set the iv, then
|
||||
* decrypt the ciphertext
|
||||
*/
|
||||
status = srtp_cipher_init(c, key);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
status = srtp_cipher_set_iv(c, (uint8_t *)test_case->idx,
|
||||
srtp_direction_decrypt);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
if (c->algorithm == SRTP_AES_GCM_128 ||
|
||||
c->algorithm == SRTP_AES_GCM_256) {
|
||||
/*
|
||||
* Set the AAD
|
||||
*/
|
||||
status = srtp_cipher_set_aad(c, test_case->aad,
|
||||
test_case->aad_length_octets);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
debug_print(srtp_mod_cipher, "AAD: %s",
|
||||
srtp_octet_string_hex_string(
|
||||
test_case->aad, test_case->aad_length_octets));
|
||||
}
|
||||
decrypted_len = sizeof(buffer);
|
||||
status = srtp_cipher_decrypt(c, buffer, encrypted_len, buffer,
|
||||
&decrypted_len);
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return status;
|
||||
}
|
||||
|
||||
debug_print(srtp_mod_cipher, "plaintext[2]: %s",
|
||||
srtp_octet_string_hex_string(buffer, decrypted_len));
|
||||
|
||||
/* compare the resulting plaintext with the original one */
|
||||
if (decrypted_len != plaintext_len) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
status = srtp_err_status_ok;
|
||||
for (size_t k = 0; k < plaintext_len; k++) {
|
||||
if (buffer[k] != buffer2[k]) {
|
||||
status = srtp_err_status_algo_fail;
|
||||
debug_print(srtp_mod_cipher, "random test case %zu failed",
|
||||
case_num);
|
||||
debug_print(srtp_mod_cipher, "(failure at byte %zu)", k);
|
||||
}
|
||||
}
|
||||
if (status) {
|
||||
srtp_cipher_dealloc(c);
|
||||
return srtp_err_status_algo_fail;
|
||||
}
|
||||
}
|
||||
|
||||
status = srtp_cipher_dealloc(c);
|
||||
if (status) {
|
||||
return status;
|
||||
}
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
/*
|
||||
* srtp_cipher_type_self_test(ct) performs srtp_cipher_type_test on ct's
|
||||
* internal list of test data.
|
||||
*/
|
||||
srtp_err_status_t srtp_cipher_type_self_test(const srtp_cipher_type_t *ct)
|
||||
{
|
||||
return srtp_cipher_type_test(ct, ct->test_data);
|
||||
}
|
||||
|
||||
/*
|
||||
* cipher_bits_per_second(c, l, t) computes (an estimate of) the
|
||||
* number of bits that a cipher implementation can encrypt in a second
|
||||
*
|
||||
* c is a cipher (which MUST be allocated and initialized already), l
|
||||
* is the length in octets of the test data to be encrypted, and t is
|
||||
* the number of trials
|
||||
*
|
||||
* if an error is encountered, the value 0 is returned
|
||||
*/
|
||||
uint64_t srtp_cipher_bits_per_second(srtp_cipher_t *c,
|
||||
size_t octets_in_buffer,
|
||||
size_t num_trials)
|
||||
{
|
||||
v128_t nonce;
|
||||
clock_t timer;
|
||||
uint8_t *enc_buf;
|
||||
size_t len = octets_in_buffer;
|
||||
size_t out_len;
|
||||
size_t tag_len = SRTP_MAX_TAG_LEN;
|
||||
uint8_t aad[4] = { 0, 0, 0, 0 };
|
||||
size_t aad_len = 4;
|
||||
|
||||
enc_buf = (uint8_t *)srtp_crypto_alloc(octets_in_buffer + tag_len);
|
||||
if (enc_buf == NULL) {
|
||||
return 0; /* indicate bad parameters by returning null */
|
||||
}
|
||||
/* time repeated trials */
|
||||
v128_set_to_zero(&nonce);
|
||||
timer = clock();
|
||||
for (size_t i = 0; i < num_trials; i++, nonce.v32[3] = (uint32_t)i) {
|
||||
// Set IV
|
||||
if (srtp_cipher_set_iv(c, (uint8_t *)&nonce, srtp_direction_encrypt) !=
|
||||
srtp_err_status_ok) {
|
||||
srtp_crypto_free(enc_buf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Set (empty) AAD if supported by the cipher
|
||||
if (c->type->set_aad) {
|
||||
if (srtp_cipher_set_aad(c, aad, aad_len) != srtp_err_status_ok) {
|
||||
srtp_crypto_free(enc_buf);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
// Encrypt the buffer
|
||||
out_len = octets_in_buffer + tag_len;
|
||||
if (srtp_cipher_encrypt(c, enc_buf, len, enc_buf, &out_len) !=
|
||||
srtp_err_status_ok) {
|
||||
srtp_crypto_free(enc_buf);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
timer = clock() - timer;
|
||||
|
||||
srtp_crypto_free(enc_buf);
|
||||
|
||||
if (timer == 0) {
|
||||
/* Too fast! */
|
||||
return 0;
|
||||
}
|
||||
|
||||
return (uint64_t)CLOCKS_PER_SEC * num_trials * 8 * octets_in_buffer / timer;
|
||||
}
|
||||
365
libsrtp/crypto/cipher/cipher_test_cases.c
Normal file
365
libsrtp/crypto/cipher/cipher_test_cases.c
Normal file
@@ -0,0 +1,365 @@
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2021, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#include "cipher_test_cases.h"
|
||||
#include <stddef.h>
|
||||
|
||||
/*
|
||||
* KAT values for AES self-test. These
|
||||
* values came from the legacy libsrtp code.
|
||||
*/
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_128_test_case_0_key[SRTP_AES_ICM_128_KEY_LEN_WSALT] = {
|
||||
0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
|
||||
0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c,
|
||||
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
|
||||
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static uint8_t srtp_aes_icm_128_test_case_0_nonce[16] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_128_test_case_0_plaintext[32] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_128_test_case_0_ciphertext[32] = {
|
||||
0xe0, 0x3e, 0xad, 0x09, 0x35, 0xc9, 0x5e, 0x80,
|
||||
0xe1, 0x66, 0xb1, 0x6d, 0xd9, 0x2b, 0x4e, 0xb4,
|
||||
0xd2, 0x35, 0x13, 0x16, 0x2b, 0x02, 0xd0, 0xf7,
|
||||
0x2a, 0x43, 0xa2, 0xfe, 0x4a, 0x5f, 0x97, 0xab
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
const srtp_cipher_test_case_t srtp_aes_icm_128_test_case_0 = {
|
||||
SRTP_AES_ICM_128_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_icm_128_test_case_0_key, /* key */
|
||||
srtp_aes_icm_128_test_case_0_nonce, /* packet index */
|
||||
32, /* octets in plaintext */
|
||||
srtp_aes_icm_128_test_case_0_plaintext, /* plaintext */
|
||||
32, /* octets in ciphertext */
|
||||
srtp_aes_icm_128_test_case_0_ciphertext, /* ciphertext */
|
||||
0, /* */
|
||||
NULL, /* */
|
||||
0, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
/*
|
||||
* KAT values for AES-192-CTR self-test. These
|
||||
* values came from section 7 of RFC 6188.
|
||||
*/
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_192_test_case_0_key[SRTP_AES_ICM_192_KEY_LEN_WSALT] = {
|
||||
0xea, 0xb2, 0x34, 0x76, 0x4e, 0x51, 0x7b, 0x2d,
|
||||
0x3d, 0x16, 0x0d, 0x58, 0x7d, 0x8c, 0x86, 0x21,
|
||||
0x97, 0x40, 0xf6, 0x5f, 0x99, 0xb6, 0xbc, 0xf7,
|
||||
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
|
||||
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static uint8_t srtp_aes_icm_192_test_case_0_nonce[16] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_192_test_case_0_plaintext[32] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_192_test_case_0_ciphertext[32] = {
|
||||
0x35, 0x09, 0x6c, 0xba, 0x46, 0x10, 0x02, 0x8d,
|
||||
0xc1, 0xb5, 0x75, 0x03, 0x80, 0x4c, 0xe3, 0x7c,
|
||||
0x5d, 0xe9, 0x86, 0x29, 0x1d, 0xcc, 0xe1, 0x61,
|
||||
0xd5, 0x16, 0x5e, 0xc4, 0x56, 0x8f, 0x5c, 0x9a
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
const srtp_cipher_test_case_t srtp_aes_icm_192_test_case_0 = {
|
||||
SRTP_AES_ICM_192_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_icm_192_test_case_0_key, /* key */
|
||||
srtp_aes_icm_192_test_case_0_nonce, /* packet index */
|
||||
32, /* octets in plaintext */
|
||||
srtp_aes_icm_192_test_case_0_plaintext, /* plaintext */
|
||||
32, /* octets in ciphertext */
|
||||
srtp_aes_icm_192_test_case_0_ciphertext, /* ciphertext */
|
||||
0, /* */
|
||||
NULL, /* */
|
||||
0, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
/*
|
||||
* KAT values for AES-256-CTR self-test. These
|
||||
* values came from section 7 of RFC 6188.
|
||||
*/
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_256_test_case_0_key[SRTP_AES_ICM_256_KEY_LEN_WSALT] = {
|
||||
0x57, 0xf8, 0x2f, 0xe3, 0x61, 0x3f, 0xd1, 0x70,
|
||||
0xa8, 0x5e, 0xc9, 0x3c, 0x40, 0xb1, 0xf0, 0x92,
|
||||
0x2e, 0xc4, 0xcb, 0x0d, 0xc0, 0x25, 0xb5, 0x82,
|
||||
0x72, 0x14, 0x7c, 0xc4, 0x38, 0x94, 0x4a, 0x98,
|
||||
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
|
||||
0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static uint8_t srtp_aes_icm_256_test_case_0_nonce[16] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_256_test_case_0_plaintext[32] = {
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_icm_256_test_case_0_ciphertext[32] = {
|
||||
0x92, 0xbd, 0xd2, 0x8a, 0x93, 0xc3, 0xf5, 0x25,
|
||||
0x11, 0xc6, 0x77, 0xd0, 0x8b, 0x55, 0x15, 0xa4,
|
||||
0x9d, 0xa7, 0x1b, 0x23, 0x78, 0xa8, 0x54, 0xf6,
|
||||
0x70, 0x50, 0x75, 0x6d, 0xed, 0x16, 0x5b, 0xac
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
const srtp_cipher_test_case_t srtp_aes_icm_256_test_case_0 = {
|
||||
SRTP_AES_ICM_256_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_icm_256_test_case_0_key, /* key */
|
||||
srtp_aes_icm_256_test_case_0_nonce, /* packet index */
|
||||
32, /* octets in plaintext */
|
||||
srtp_aes_icm_256_test_case_0_plaintext, /* plaintext */
|
||||
32, /* octets in ciphertext */
|
||||
srtp_aes_icm_256_test_case_0_ciphertext, /* ciphertext */
|
||||
0, /* */
|
||||
NULL, /* */
|
||||
0, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
/*
|
||||
* KAT values for AES self-test. These
|
||||
* values we're derived from independent test code
|
||||
* using OpenSSL.
|
||||
*/
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_128_test_case_0_key[SRTP_AES_GCM_128_KEY_LEN_WSALT] = {
|
||||
0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
|
||||
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
|
||||
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
|
||||
0x09, 0x0a, 0x0b, 0x0c,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static uint8_t srtp_aes_gcm_128_test_case_0_iv[12] = {
|
||||
0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
|
||||
0xde, 0xca, 0xf8, 0x88
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_128_test_case_0_plaintext[60] = {
|
||||
0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
|
||||
0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
|
||||
0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
|
||||
0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
|
||||
0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
|
||||
0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
|
||||
0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
|
||||
0xba, 0x63, 0x7b, 0x39
|
||||
};
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_128_test_case_0_aad[20] = {
|
||||
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
|
||||
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
|
||||
0xab, 0xad, 0xda, 0xd2
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_128_test_case_0_ciphertext[76] = {
|
||||
0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
|
||||
0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
|
||||
0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
|
||||
0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
|
||||
0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
|
||||
0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
|
||||
0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
|
||||
0x3d, 0x58, 0xe0, 0x91,
|
||||
/* the last 16 bytes are the tag */
|
||||
0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb,
|
||||
0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
static const srtp_cipher_test_case_t srtp_aes_gcm_128_test_case_0a = {
|
||||
SRTP_AES_GCM_128_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_gcm_128_test_case_0_key, /* key */
|
||||
srtp_aes_gcm_128_test_case_0_iv, /* packet index */
|
||||
60, /* octets in plaintext */
|
||||
srtp_aes_gcm_128_test_case_0_plaintext, /* plaintext */
|
||||
68, /* octets in ciphertext */
|
||||
srtp_aes_gcm_128_test_case_0_ciphertext, /* ciphertext + tag */
|
||||
20, /* octets in AAD */
|
||||
srtp_aes_gcm_128_test_case_0_aad, /* AAD */
|
||||
8, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
const srtp_cipher_test_case_t srtp_aes_gcm_128_test_case_0 = {
|
||||
SRTP_AES_GCM_128_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_gcm_128_test_case_0_key, /* key */
|
||||
srtp_aes_gcm_128_test_case_0_iv, /* packet index */
|
||||
60, /* octets in plaintext */
|
||||
srtp_aes_gcm_128_test_case_0_plaintext, /* plaintext */
|
||||
76, /* octets in ciphertext */
|
||||
srtp_aes_gcm_128_test_case_0_ciphertext, /* ciphertext + tag */
|
||||
20, /* octets in AAD */
|
||||
srtp_aes_gcm_128_test_case_0_aad, /* AAD */
|
||||
16, /* */
|
||||
&srtp_aes_gcm_128_test_case_0a /* pointer to next testcase */
|
||||
};
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_256_test_case_0_key[SRTP_AES_GCM_256_KEY_LEN_WSALT] = {
|
||||
0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
|
||||
0xa5, 0x59, 0x09, 0xc5, 0x54, 0x66, 0x93, 0x1c,
|
||||
0xaf, 0xf5, 0x26, 0x9a, 0x21, 0xd5, 0x14, 0xb2,
|
||||
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
|
||||
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
|
||||
0x09, 0x0a, 0x0b, 0x0c,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static uint8_t srtp_aes_gcm_256_test_case_0_iv[12] = {
|
||||
0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
|
||||
0xde, 0xca, 0xf8, 0x88
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_256_test_case_0_plaintext[60] = {
|
||||
0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
|
||||
0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
|
||||
0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
|
||||
0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
|
||||
0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
|
||||
0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
|
||||
0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
|
||||
0xba, 0x63, 0x7b, 0x39
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_256_test_case_0_aad[20] = {
|
||||
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
|
||||
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
|
||||
0xab, 0xad, 0xda, 0xd2
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
/* clang-format off */
|
||||
static const uint8_t srtp_aes_gcm_256_test_case_0_ciphertext[76] = {
|
||||
0x0b, 0x11, 0xcf, 0xaf, 0x68, 0x4d, 0xae, 0x46,
|
||||
0xc7, 0x90, 0xb8, 0x8e, 0xb7, 0x6a, 0x76, 0x2a,
|
||||
0x94, 0x82, 0xca, 0xab, 0x3e, 0x39, 0xd7, 0x86,
|
||||
0x1b, 0xc7, 0x93, 0xed, 0x75, 0x7f, 0x23, 0x5a,
|
||||
0xda, 0xfd, 0xd3, 0xe2, 0x0e, 0x80, 0x87, 0xa9,
|
||||
0x6d, 0xd7, 0xe2, 0x6a, 0x7d, 0x5f, 0xb4, 0x80,
|
||||
0xef, 0xef, 0xc5, 0x29, 0x12, 0xd1, 0xaa, 0x10,
|
||||
0x09, 0xc9, 0x86, 0xc1,
|
||||
/* the last 16 bytes are the tag */
|
||||
0x45, 0xbc, 0x03, 0xe6, 0xe1, 0xac, 0x0a, 0x9f,
|
||||
0x81, 0xcb, 0x8e, 0x5b, 0x46, 0x65, 0x63, 0x1d,
|
||||
};
|
||||
/* clang-format on */
|
||||
|
||||
static const srtp_cipher_test_case_t srtp_aes_gcm_256_test_case_0a = {
|
||||
SRTP_AES_GCM_256_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_gcm_256_test_case_0_key, /* key */
|
||||
srtp_aes_gcm_256_test_case_0_iv, /* packet index */
|
||||
60, /* octets in plaintext */
|
||||
srtp_aes_gcm_256_test_case_0_plaintext, /* plaintext */
|
||||
68, /* octets in ciphertext */
|
||||
srtp_aes_gcm_256_test_case_0_ciphertext, /* ciphertext + tag */
|
||||
20, /* octets in AAD */
|
||||
srtp_aes_gcm_256_test_case_0_aad, /* AAD */
|
||||
8, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
const srtp_cipher_test_case_t srtp_aes_gcm_256_test_case_0 = {
|
||||
SRTP_AES_GCM_256_KEY_LEN_WSALT, /* octets in key */
|
||||
srtp_aes_gcm_256_test_case_0_key, /* key */
|
||||
srtp_aes_gcm_256_test_case_0_iv, /* packet index */
|
||||
60, /* octets in plaintext */
|
||||
srtp_aes_gcm_256_test_case_0_plaintext, /* plaintext */
|
||||
76, /* octets in ciphertext */
|
||||
srtp_aes_gcm_256_test_case_0_ciphertext, /* ciphertext + tag */
|
||||
20, /* octets in AAD */
|
||||
srtp_aes_gcm_256_test_case_0_aad, /* AAD */
|
||||
16, /* */
|
||||
&srtp_aes_gcm_256_test_case_0a /* pointer to next testcase */
|
||||
};
|
||||
53
libsrtp/crypto/cipher/cipher_test_cases.h
Normal file
53
libsrtp/crypto/cipher/cipher_test_cases.h
Normal file
@@ -0,0 +1,53 @@
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2013-2021, Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef CIPHER_TEST_CASES_H
|
||||
#define CIPHER_TEST_CASES_H
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include "cipher.h"
|
||||
|
||||
extern const srtp_cipher_test_case_t srtp_aes_icm_128_test_case_0;
|
||||
extern const srtp_cipher_test_case_t srtp_aes_icm_192_test_case_0;
|
||||
extern const srtp_cipher_test_case_t srtp_aes_icm_256_test_case_0;
|
||||
|
||||
extern const srtp_cipher_test_case_t srtp_aes_gcm_128_test_case_0;
|
||||
extern const srtp_cipher_test_case_t srtp_aes_gcm_256_test_case_0;
|
||||
|
||||
#endif
|
||||
166
libsrtp/crypto/cipher/null_cipher.c
Normal file
166
libsrtp/crypto/cipher/null_cipher.c
Normal file
@@ -0,0 +1,166 @@
|
||||
/*
|
||||
* null_cipher.c
|
||||
*
|
||||
* A null cipher implementation. This cipher leaves the plaintext
|
||||
* unchanged.
|
||||
*
|
||||
* David A. McGrew
|
||||
* Cisco Systems, Inc.
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* Copyright (c) 2001-2017 Cisco Systems, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
*
|
||||
* Redistributions in binary form must reproduce the above
|
||||
* copyright notice, this list of conditions and the following
|
||||
* disclaimer in the documentation and/or other materials provided
|
||||
* with the distribution.
|
||||
*
|
||||
* Neither the name of the Cisco Systems, Inc. nor the names of its
|
||||
* contributors may be used to endorse or promote products derived
|
||||
* from this software without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
||||
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||||
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
|
||||
* OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include <config.h>
|
||||
#endif
|
||||
|
||||
#include "datatypes.h"
|
||||
#include "null_cipher.h"
|
||||
#include "err.h" /* for srtp_debug */
|
||||
#include "alloc.h"
|
||||
#include "cipher_types.h"
|
||||
|
||||
static srtp_err_status_t srtp_null_cipher_alloc(srtp_cipher_t **c,
|
||||
size_t key_len,
|
||||
size_t tlen)
|
||||
{
|
||||
extern const srtp_cipher_type_t srtp_null_cipher;
|
||||
(void)tlen;
|
||||
|
||||
debug_print(srtp_mod_cipher, "allocating cipher with key length %zu",
|
||||
key_len);
|
||||
|
||||
/* allocate memory a cipher of type null_cipher */
|
||||
*c = (srtp_cipher_t *)srtp_crypto_alloc(sizeof(srtp_cipher_t));
|
||||
if (*c == NULL) {
|
||||
return srtp_err_status_alloc_fail;
|
||||
}
|
||||
|
||||
/* set pointers */
|
||||
(*c)->algorithm = SRTP_NULL_CIPHER;
|
||||
(*c)->type = &srtp_null_cipher;
|
||||
(*c)->state = (void *)0x1; /* The null cipher does not maintain state */
|
||||
|
||||
/* set key size */
|
||||
(*c)->key_len = key_len;
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_null_cipher_dealloc(srtp_cipher_t *c)
|
||||
{
|
||||
extern const srtp_cipher_type_t srtp_null_cipher;
|
||||
|
||||
/* zeroize entire state*/
|
||||
octet_string_set_to_zero(c, sizeof(srtp_cipher_t));
|
||||
|
||||
/* free memory of type null_cipher */
|
||||
srtp_crypto_free(c);
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_null_cipher_init(void *cv, const uint8_t *key)
|
||||
{
|
||||
/* srtp_null_cipher_ctx_t *c = (srtp_null_cipher_ctx_t *)cv; */
|
||||
(void)cv;
|
||||
(void)key;
|
||||
debug_print0(srtp_mod_cipher, "initializing null cipher");
|
||||
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_null_cipher_set_iv(void *cv,
|
||||
uint8_t *iv,
|
||||
srtp_cipher_direction_t dir)
|
||||
{
|
||||
/* srtp_null_cipher_ctx_t *c = (srtp_null_cipher_ctx_t *)cv; */
|
||||
(void)cv;
|
||||
(void)iv;
|
||||
(void)dir;
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static srtp_err_status_t srtp_null_cipher_encrypt(void *cv,
|
||||
const uint8_t *src,
|
||||
size_t src_len,
|
||||
uint8_t *dst,
|
||||
size_t *dst_len)
|
||||
{
|
||||
(void)cv;
|
||||
if (src != dst) {
|
||||
if (*dst_len < src_len) {
|
||||
return srtp_err_status_buffer_small;
|
||||
}
|
||||
memcpy(dst, src, src_len);
|
||||
}
|
||||
*dst_len = src_len;
|
||||
return srtp_err_status_ok;
|
||||
}
|
||||
|
||||
static const char srtp_null_cipher_description[] = "null cipher";
|
||||
|
||||
static const srtp_cipher_test_case_t srtp_null_cipher_test_0 = {
|
||||
0, /* octets in key */
|
||||
NULL, /* key */
|
||||
0, /* packet index */
|
||||
0, /* octets in plaintext */
|
||||
NULL, /* plaintext */
|
||||
0, /* octets in plaintext */
|
||||
NULL, /* ciphertext */
|
||||
0, /* */
|
||||
NULL, /* */
|
||||
0, /* */
|
||||
NULL /* pointer to next testcase */
|
||||
};
|
||||
|
||||
/*
|
||||
* note: the decrypt function is identical to the encrypt function
|
||||
*/
|
||||
|
||||
const srtp_cipher_type_t srtp_null_cipher = {
|
||||
srtp_null_cipher_alloc, /* */
|
||||
srtp_null_cipher_dealloc, /* */
|
||||
srtp_null_cipher_init, /* */
|
||||
0, /* set_aad */
|
||||
srtp_null_cipher_encrypt, /* */
|
||||
srtp_null_cipher_encrypt, /* */
|
||||
srtp_null_cipher_set_iv, /* */
|
||||
srtp_null_cipher_description, /* */
|
||||
&srtp_null_cipher_test_0, /* */
|
||||
SRTP_NULL_CIPHER /* */
|
||||
};
|
||||
Reference in New Issue
Block a user