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80 lines
1.8 KiB
80 lines
1.8 KiB
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "sm4_core.h"
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static void rk_crypto_cbc128_encrypt(void *ctx, const unsigned char *in, unsigned char *out,
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unsigned int len, unsigned char *ivec, block128_f block)
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{
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unsigned int n;
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const unsigned char *iv = ivec;
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while (len) {
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for(n=0; n<SM4_BLOCK_SIZE && n<len; ++n)
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out[n] = in[n] ^ iv[n];
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for(; n<SM4_BLOCK_SIZE; ++n)
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out[n] = iv[n];
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(*block)(out, out, ctx);
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iv = out;
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if (len<=SM4_BLOCK_SIZE) break;
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len -= SM4_BLOCK_SIZE;
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in += SM4_BLOCK_SIZE;
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out += SM4_BLOCK_SIZE;
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}
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memcpy(ivec,iv,SM4_BLOCK_SIZE);
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}
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static void rk_crypto_cbc128_decrypt(void *ctx, const unsigned char *in, unsigned char *out,
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unsigned int len, unsigned char *ivec, block128_f block)
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{
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unsigned int n;
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unsigned char c;
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unsigned char tmp_buf[SM4_BLOCK_SIZE];
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memset(tmp_buf, 0x00, sizeof(tmp_buf));
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while (len) {
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(*block)(in, tmp_buf, ctx);
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for(n=0; n<SM4_BLOCK_SIZE && n<len; ++n) {
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c = in[n];
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out[n] = tmp_buf[n] ^ ivec[n];
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ivec[n] = c;
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}
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if (len<=SM4_BLOCK_SIZE) {
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for (; n<SM4_BLOCK_SIZE; ++n)
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ivec[n] = in[n];
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break;
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}
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len -= SM4_BLOCK_SIZE;
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in += SM4_BLOCK_SIZE;
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out += SM4_BLOCK_SIZE;
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}
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}
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int rk_sm4_cbc_encrypt(const unsigned char *in, unsigned char *out,
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unsigned int length, const unsigned char *key, const int key_len,
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unsigned char *ivec, const int enc)
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{
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sm4_context ctx;
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if(key_len != 16)
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return -1;
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if(length%SM4_BLOCK_SIZE || length == 0)
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return -1;
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if (enc) {
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rk_sm4_setkey_enc(&ctx, key);
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rk_crypto_cbc128_encrypt((void*)&ctx, in, out, length, ivec, rk_rk_sm4_crypt_ecb);
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} else {
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rk_sm4_setkey_dec(&ctx, key);
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rk_crypto_cbc128_decrypt((void*)&ctx, in, out, length, ivec, rk_rk_sm4_crypt_ecb);
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}
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return 0;
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}
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