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srs/trunk/3rdparty/libsrtp-2-fit/crypto/cipher/aes_icm_ossl.c

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/*
* 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"
srtp_debug_module_t srtp_mod_aes_icm = {
0, /* 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,
int key_len,
int tlen)
{
srtp_aes_icm_ctx_t *icm;
debug_print(srtp_mod_aes_icm, "allocating cipher with key length %d",
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_cleanup(c->ctx);
if (!EVP_EncryptInit_ex(c->ctx, evp, NULL, key, NULL)) {
return srtp_err_status_fail;
} else {
return srtp_err_status_ok;
}
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;
/* 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;
} else {
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,
unsigned char *buf,
unsigned int *enc_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 (!EVP_EncryptUpdate(c->ctx, buf, &len, buf, *enc_len)) {
return srtp_err_status_cipher_fail;
}
*enc_len = len;
if (!EVP_EncryptFinal_ex(c->ctx, buf + len, &len)) {
return srtp_err_status_cipher_fail;
}
*enc_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";
/*
* 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 */
static 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 */
static 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 */
static 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 */
};
/*
* 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, /* */
0, /* get_tag */
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, /* */
0, /* get_tag */
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, /* */
0, /* get_tag */
srtp_aes_icm_256_openssl_description, /* */
&srtp_aes_icm_256_test_case_0, /* */
SRTP_AES_ICM_256 /* */
};
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