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pjsip-pjproject/third_party/srtp/crypto/cipher/aes_icm_nss.c

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/*
* 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 = {
0, /* 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,
int key_len,
int tlen)
{
srtp_aes_icm_ctx_t *icm;
NSSInitContext *nss;
(void)tlen;
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;
}
/* 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;
}
SECItem keyItem = { siBuffer, (unsigned char *)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 *)&param,
sizeof(CK_AES_CTR_PARAMS) };
c->ctx = PK11_CreateContextBySymKey(CKM_AES_CTR, CKA_ENCRYPT, c->key,
&paramItem);
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,
unsigned char *buf,
unsigned int *enc_len)
{
srtp_aes_icm_ctx_t *c = (srtp_aes_icm_ctx_t *)cv;
if (!c->ctx) {
return srtp_err_status_bad_param;
}
int rv =
PK11_CipherOp(c->ctx, buf, (int *)enc_len, *enc_len, buf, *enc_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, /* */
0, /* get_tag */
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, /* */
0, /* get_tag */
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, /* */
0, /* get_tag */
srtp_aes_icm_256_nss_description, /* */
&srtp_aes_icm_256_test_case_0, /* */
SRTP_AES_ICM_256 /* */
};
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