mirror of
https://github.com/guanzhi/GmSSL.git
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75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <string.h>
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#include <gmssl/sha2.h>
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#include <gmssl/error.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 sha256_hmac_init(SHA256_HMAC_CTX *ctx, const uint8_t *key, size_t key_len)
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{
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int i;
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if (key_len <= SHA256_BLOCK_SIZE) {
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memcpy(ctx->key, key, key_len);
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memset(ctx->key + key_len, 0, SHA256_BLOCK_SIZE - key_len);
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} else {
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sha256_init(&ctx->sha256_ctx);
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sha256_update(&ctx->sha256_ctx, key, key_len);
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sha256_finish(&ctx->sha256_ctx, ctx->key);
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memset(ctx->key + SHA256_DIGEST_SIZE, 0,
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SHA256_BLOCK_SIZE - SHA256_DIGEST_SIZE);
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}
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for (i = 0; i < SHA256_BLOCK_SIZE; i++) {
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ctx->key[i] ^= IPAD;
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}
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sha256_init(&ctx->sha256_ctx);
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sha256_update(&ctx->sha256_ctx, ctx->key, SHA256_BLOCK_SIZE);
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}
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void sha256_hmac_update(SHA256_HMAC_CTX *ctx, const uint8_t *data, size_t data_len)
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{
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sha256_update(&ctx->sha256_ctx, data, data_len);
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}
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void sha256_hmac_finish(SHA256_HMAC_CTX *ctx, uint8_t mac[SHA256_HMAC_SIZE])
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{
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int i;
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for (i = 0; i < SHA256_BLOCK_SIZE; i++) {
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ctx->key[i] ^= (IPAD ^ OPAD);
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}
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sha256_finish(&ctx->sha256_ctx, mac);
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sha256_init(&ctx->sha256_ctx);
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sha256_update(&ctx->sha256_ctx, ctx->key, SHA256_BLOCK_SIZE);
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sha256_update(&ctx->sha256_ctx, mac, SHA256_DIGEST_SIZE);
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sha256_finish(&ctx->sha256_ctx, mac);
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}
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