mirror of
https://github.com/guanzhi/GmSSL.git
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50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/*
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* Copyright 2014-2022 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <gmssl/mem.h>
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#include <gmssl/rand.h>
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#include <gmssl/error.h>
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#include <gmssl/sm4_cbc_mac.h>
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void sm4_cbc_mac_init(SM4_CBC_MAC_CTX *ctx, const uint8_t key[16])
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{
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sm4_set_encrypt_key(&ctx->key, key);
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memset(ctx->iv, 0, 16);
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ctx->ivlen = 0;
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}
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void sm4_cbc_mac_update(SM4_CBC_MAC_CTX *ctx, const uint8_t *data, size_t datalen)
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{
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while (datalen) {
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size_t ivleft = 16 - ctx->ivlen;
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size_t len = datalen < ivleft ? datalen : ivleft;
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gmssl_memxor(ctx->iv + ctx->ivlen, ctx->iv + ctx->ivlen, data, len);
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ctx->ivlen += len;
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if (ctx->ivlen >= 16) {
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sm4_encrypt(&ctx->key, ctx->iv, ctx->iv);
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ctx->ivlen = 0;
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}
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data += len;
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datalen -= len;
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}
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}
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void sm4_cbc_mac_finish(SM4_CBC_MAC_CTX *ctx, uint8_t mac[16])
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{
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if (ctx->ivlen) {
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sm4_encrypt(&ctx->key, ctx->iv, ctx->iv);
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}
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memcpy(mac, ctx->iv, 16);
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}
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