/*
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* HMAC-SHA-224/256/384/512 implementation
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* Last update: 06/15/2005
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* Issue date: 06/15/2005
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*
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* Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
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* All rights reserved.
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*
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* Copyright (c) 2016, Linaro Limited
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <string.h>
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#include "hmac_sha2.h"
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/* HMAC-SHA-256 functions */
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void hmac_sha256_init(hmac_sha256_ctx *ctx, const unsigned char *key,
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unsigned int key_size)
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{
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unsigned int fill;
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unsigned int num;
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const unsigned char *key_used;
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unsigned char key_temp[SHA256_DIGEST_SIZE];
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int i;
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if (key_size == SHA256_BLOCK_SIZE) {
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key_used = key;
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num = SHA256_BLOCK_SIZE;
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} else {
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if (key_size > SHA256_BLOCK_SIZE){
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num = SHA256_DIGEST_SIZE;
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sha256(key, key_size, key_temp);
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key_used = key_temp;
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} else { /* key_size > SHA256_BLOCK_SIZE */
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key_used = key;
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num = key_size;
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}
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fill = SHA256_BLOCK_SIZE - num;
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memset(ctx->block_ipad + num, 0x36, fill);
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memset(ctx->block_opad + num, 0x5c, fill);
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}
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for (i = 0; i < (int) num; i++) {
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ctx->block_ipad[i] = key_used[i] ^ 0x36;
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ctx->block_opad[i] = key_used[i] ^ 0x5c;
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}
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sha256_init(&ctx->ctx_inside);
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sha256_update(&ctx->ctx_inside, ctx->block_ipad, SHA256_BLOCK_SIZE);
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sha256_init(&ctx->ctx_outside);
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sha256_update(&ctx->ctx_outside, ctx->block_opad,
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SHA256_BLOCK_SIZE);
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/* for hmac_reinit */
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memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
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sizeof(sha256_ctx));
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memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
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sizeof(sha256_ctx));
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}
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void hmac_sha256_reinit(hmac_sha256_ctx *ctx)
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{
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memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit,
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sizeof(sha256_ctx));
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memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit,
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sizeof(sha256_ctx));
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}
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void hmac_sha256_update(hmac_sha256_ctx *ctx, const unsigned char *message,
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unsigned int message_len)
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{
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sha256_update(&ctx->ctx_inside, message, message_len);
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}
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void hmac_sha256_final(hmac_sha256_ctx *ctx, unsigned char *mac,
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unsigned int mac_size)
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{
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unsigned char digest_inside[SHA256_DIGEST_SIZE];
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unsigned char mac_temp[SHA256_DIGEST_SIZE];
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sha256_final(&ctx->ctx_inside, digest_inside);
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sha256_update(&ctx->ctx_outside, digest_inside, SHA256_DIGEST_SIZE);
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sha256_final(&ctx->ctx_outside, mac_temp);
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memcpy(mac, mac_temp, mac_size);
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}
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void hmac_sha256(const unsigned char *key, unsigned int key_size,
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const unsigned char *message, unsigned int message_len,
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unsigned char *mac, unsigned mac_size)
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{
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hmac_sha256_ctx ctx;
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hmac_sha256_init(&ctx, key, key_size);
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hmac_sha256_update(&ctx, message, message_len);
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hmac_sha256_final(&ctx, mac, mac_size);
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}
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