76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#include "aes_core.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static void rk_crypto_cbc128_encrypt(const unsigned char *in,
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unsigned char *out, int len,
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const void *key, unsigned char *ivec) {
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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 < 16 && n < len; ++n)
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out[n] = in[n] ^ iv[n];
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for (; n < 16; ++n)
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out[n] = iv[n];
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rk_aes_encrypt(out, out, key);
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iv = out;
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if (len <= 16)
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break;
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len -= 16;
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in += 16;
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out += 16;
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}
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memcpy(ivec, iv, 16);
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}
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static void rk_crypto_cbc128_decrypt(const unsigned char *in,
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unsigned char *out, int len,
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const void *key, unsigned char *ivec) {
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int n;
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unsigned char c;
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unsigned char tmp_buf[AES_BLOCK_SIZE];
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memset(tmp_buf, 0x00, sizeof(tmp_buf));
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while (len) {
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rk_aes_decrypt(in, tmp_buf, key);
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for (n = 0; n < 16 && 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 <= 16) {
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for (; n < 16; ++n)
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ivec[n] = in[n];
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break;
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}
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len -= 16;
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in += 16;
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out += 16;
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}
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}
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int rk_aes_cbc_encrypt(const unsigned char *in, unsigned char *out,
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unsigned long length, const unsigned char *key,
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const int key_len, unsigned char *ivec, const int enc) {
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RK_AES_KEY ks;
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if (key_len != 16 && key_len != 24 && key_len != 32)
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return -1;
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if (length % AES_BLOCK_SIZE)
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return -1;
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if (enc) {
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rk_aes_set_encrypt_key(key, key_len * 8, &ks);
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rk_crypto_cbc128_encrypt(in, out, length, &ks, ivec);
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} else {
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rk_aes_set_decrypt_key(key, key_len * 8, &ks);
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rk_crypto_cbc128_decrypt(in, out, length, &ks, ivec);
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}
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return 0;
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}
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