forked from xuos/xiuos
126 lines
4.1 KiB
C
Executable File
126 lines
4.1 KiB
C
Executable File
/* ====================================================================
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* Copyright (c) 2014 - 2017 The GmSSL Project. 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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*
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the GmSSL Project.
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* (http://gmssl.org/)"
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*
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* 4. The name "GmSSL Project" must not be used to endorse or promote
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* products derived from this software without prior written
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* permission. For written permission, please contact
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* guanzhi1980@gmail.com.
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*
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* 5. Products derived from this software may not be called "GmSSL"
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* nor may "GmSSL" appear in their names without prior written
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* permission of the GmSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the GmSSL Project
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* (http://gmssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE GmSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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*/
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#include <sm3.h>
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/**
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* HMAC_k(m) = H((k ^ opad), H((k ^ ipad), m))
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* pseudo-code:
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* function hmac(key, message)
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* opad = [0x5c * blocksize]
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* ipad = [0x36 * blocksize]
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* if (length(key) > blocksize) then
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* key = hash(key)
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* end if
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* for i from 0 to length(key) - 1 step 1
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* ipad[i] = ipad[i] XOR key[i]
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* opad[i] = opad[i] XOR key[i]
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* end for
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* return hash(opad || hash(ipad || message))
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* end function
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*/
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#define IPAD 0x36
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#define OPAD 0x5C
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void sm3_hmac_init(sm3_hmac_ctx_t *ctx, const unsigned char *key, size_t key_len)
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{
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int i;
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if (key_len <= SM3_BLOCK_SIZE) {
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memcpy(ctx->key, key, key_len);
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memset(ctx->key + key_len, 0, SM3_BLOCK_SIZE - key_len);
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} else {
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sm3_init(&ctx->sm3_ctx);
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sm3_update(&ctx->sm3_ctx, key, key_len);
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sm3_final(&ctx->sm3_ctx, ctx->key);
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memset(ctx->key + SM3_DIGEST_LENGTH, 0,
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SM3_BLOCK_SIZE - SM3_DIGEST_LENGTH);
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}
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for (i = 0; i < SM3_BLOCK_SIZE; i++) {
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ctx->key[i] ^= IPAD;
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}
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sm3_init(&ctx->sm3_ctx);
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sm3_update(&ctx->sm3_ctx, ctx->key, SM3_BLOCK_SIZE);
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}
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void sm3_hmac_update(sm3_hmac_ctx_t *ctx,
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const unsigned char *data, size_t data_len)
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{
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sm3_update(&ctx->sm3_ctx, data, data_len);
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}
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void sm3_hmac_final(sm3_hmac_ctx_t *ctx, unsigned char mac[SM3_HMAC_SIZE])
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{
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int i;
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for (i = 0; i < SM3_BLOCK_SIZE; i++) {
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ctx->key[i] ^= (IPAD ^ OPAD);
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}
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sm3_final(&ctx->sm3_ctx, mac);
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sm3_init(&ctx->sm3_ctx);
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sm3_update(&ctx->sm3_ctx, ctx->key, SM3_BLOCK_SIZE);
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sm3_update(&ctx->sm3_ctx, mac, SM3_DIGEST_LENGTH);
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sm3_final(&ctx->sm3_ctx, mac);
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}
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void sm3_hmac(const unsigned char *data, size_t data_len,
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const unsigned char *key, size_t key_len,
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unsigned char mac[SM3_HMAC_SIZE])
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{
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sm3_hmac_ctx_t ctx;
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sm3_hmac_init(&ctx, key, key_len);
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sm3_hmac_update(&ctx, data, data_len);
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sm3_hmac_final(&ctx, mac);
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memset(&ctx, 0, sizeof(ctx));
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}
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