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167 lines (150 loc) · 4.61 KB
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/*
* Copyright (c) 2014 - 2020 The GmSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the GmSSL Project.
* (http://gmssl.org/)"
*
* 4. The name "GmSSL Project" must not be used to endorse or promote
* products derived from this software without prior written
* permission. For written permission, please contact
* guanzhi1980@gmail.com.
*
* 5. Products derived from this software may not be called "GmSSL"
* nor may "GmSSL" appear in their names without prior written
* permission of the GmSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the GmSSL Project
* (http://gmssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 GmSSL PROJECT OR
* ITS 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 <string.h>
#include <gmssl/hmac.h>
#include <gmssl/error.h>
#define IPAD 0x36
#define OPAD 0x5C
int hmac_init(HMAC_CTX *ctx, const DIGEST *digest, const uint8_t *key, size_t keylen)
{
uint8_t i_key[DIGEST_MAX_BLOCK_SIZE] = {0};
uint8_t o_key[DIGEST_MAX_BLOCK_SIZE] = {0};
size_t blocksize;
int i;
if (!ctx || !digest || !key || !keylen) {
error_print();
return -1;
}
ctx->digest = digest;
blocksize = digest->block_size;
if (keylen <= blocksize) {
memcpy(i_key, key, keylen);
memcpy(o_key, key, keylen);
} else {
digest_init(&ctx->digest_ctx, digest);
digest_update(&ctx->digest_ctx, key, keylen);
digest_finish(&ctx->digest_ctx, i_key, &keylen);
memcpy(o_key, i_key, keylen);
}
for (i = 0; i < blocksize; i++) {
i_key[i] ^= IPAD;
o_key[i] ^= OPAD;
}
digest_init(&ctx->i_ctx, digest);
digest_update(&ctx->i_ctx, i_key, blocksize);
digest_init(&ctx->o_ctx, digest);
digest_update(&ctx->o_ctx, o_key, blocksize);
memcpy(&ctx->digest_ctx, &ctx->i_ctx, sizeof(DIGEST_CTX));
memset(i_key, 0, sizeof(i_key));
memset(o_key, 0, sizeof(o_key));
return 1;
}
int hmac_update(HMAC_CTX *ctx, const uint8_t *data, size_t datalen)
{
if (ctx == NULL) {
error_print();
return -1;
}
if (data == NULL || datalen == 0) {
return 0;
}
if (digest_update(&ctx->digest_ctx, data, datalen) != 1) {
error_print();
return -1;
}
return 1;
}
int hmac_finish(HMAC_CTX *ctx, uint8_t *mac, size_t *maclen)
{
if (ctx == NULL || maclen == NULL) {
error_print();
return -1;
}
if (digest_finish(&ctx->digest_ctx, mac, maclen) != 1) {
error_print();
return -1;
}
memcpy(&ctx->digest_ctx, &ctx->o_ctx, sizeof(DIGEST_CTX));
if (digest_update(&ctx->digest_ctx, mac, *maclen) != 1
|| digest_finish(&ctx->digest_ctx, mac, maclen) != 1) {
error_print();
return -1;
}
return 1;
}
int hmac_finish_and_verify(HMAC_CTX *ctx, const uint8_t *mac, size_t maclen)
{
uint8_t hmac[64];
size_t hmaclen;
if (hmac_finish(ctx, hmac, &hmaclen) != 1) {
error_print();
return -1;
}
if (maclen != hmaclen
|| memcmp(hmac, mac, maclen) != 0) {
error_print();
return -1;
}
return 1;
}
int hmac(const DIGEST *digest, const uint8_t *key, size_t keylen,
const uint8_t *data, size_t datalen,
uint8_t *mac, size_t *maclen)
{
int ret = 0;
HMAC_CTX ctx;
if (hmac_init(&ctx, digest, key, keylen) != 1
|| hmac_update(&ctx, data, datalen) != 1
|| hmac_finish(&ctx, mac, maclen) != 1) {
goto end;
}
ret = 1;
end:
memset(&ctx, 0, sizeof(ctx));
return ret;
}