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hmac_sha256.cc
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hmac_sha256.cc
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/*-
* HMAC-SHA-224/256/384/512 implementation
* Last update: 06/15/2005
* Issue date: 06/15/2005
*
* Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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 "aldaba.h"
#include "sha256.h"
#include "hmac_sha256.h"
void HMAC_SHA256::hmac_sha256_init(hmac_sha256_ctx *ctx, const u8 *key, size_t key_size){
size_t fill=0;
size_t num=0;
size_t i=0;
const u8 *key_used=NULL;
u8 key_temp[SHA256_DIGEST_SIZE];
if (key_size == SHA256_BLOCK_SIZE) {
key_used = key;
num = SHA256_BLOCK_SIZE;
}else{
if (key_size > SHA256_BLOCK_SIZE) {
key_used = key_temp;
num = SHA256_DIGEST_SIZE;
SHA256::sha256sum(key, key_size, key_temp);
} else { /* key_size > SHA256_BLOCK_SIZE */
key_used = key;
num = key_size;
}
fill = SHA256_BLOCK_SIZE - num;
memset(ctx->block_ipad + num, 0x36, fill);
memset(ctx->block_opad + num, 0x5c, fill);
}
for (i = 0; i < num; i++) {
ctx->block_ipad[i] = key_used[i] ^ 0x36;
ctx->block_opad[i] = key_used[i] ^ 0x5c;
}
SHA256::sha256_init(&ctx->ctx_inside);
SHA256::sha256_update(&ctx->ctx_inside, ctx->block_ipad, SHA256_BLOCK_SIZE);
SHA256::sha256_init(&ctx->ctx_outside);
SHA256::sha256_update(&ctx->ctx_outside, ctx->block_opad, SHA256_BLOCK_SIZE);
/* for hmac_reinit */
memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside, sizeof (SHA256_CTX));
memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,sizeof (SHA256_CTX));
}
void HMAC_SHA256::hmac_sha256_reinit(hmac_sha256_ctx *ctx) {
memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit, sizeof (SHA256_CTX));
memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit, sizeof (SHA256_CTX));
}
void HMAC_SHA256::hmac_sha256_update(hmac_sha256_ctx *ctx, u8 *message, size_t message_len) {
SHA256::sha256_update(&ctx->ctx_inside, message, message_len);
}
void HMAC_SHA256::hmac_sha256_final(hmac_sha256_ctx *ctx, u8 *mac, size_t mac_size) {
u8 digest_inside[SHA256_DIGEST_SIZE];
u8 mac_temp[SHA256_DIGEST_SIZE];
SHA256::sha256_final(&ctx->ctx_inside, digest_inside);
SHA256::sha256_update(&ctx->ctx_outside, digest_inside, SHA256_DIGEST_SIZE);
SHA256::sha256_final(&ctx->ctx_outside, mac_temp);
memcpy(mac, mac_temp, mac_size);
}
void HMAC_SHA256::hmac_sha256(const u8 *key, size_t key_size, u8 *message,
size_t message_len, u8 *mac, unsigned mac_size) {
hmac_sha256_ctx ctx;
hmac_sha256_init(&ctx, key, key_size);
hmac_sha256_update(&ctx, message, message_len);
hmac_sha256_final(&ctx, mac, mac_size);
}