93 lines
2.0 KiB
C
93 lines
2.0 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 int xor
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(unsigned char *a, unsigned char *b, unsigned char *c) {
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int i = 0;
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if (a == NULL || b == NULL || c == NULL)
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return -1;
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for (i = 0; i < 16; i++) {
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*c = *a ^ *b;
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c++;
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b++;
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a++;
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}
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return 0;
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}
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static int rk_aes_cbc_mac_encrypt(const unsigned char *in,
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unsigned long length, unsigned char *out,
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const RK_AES_KEY *ks1, const int enc) {
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unsigned long i = 0;
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int ret = 0;
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unsigned char tmp[16];
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memset(out, 0x00, 16);
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memset(tmp, 0x00, 16);
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for (i = 0; i < (length / 16); i++) {
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xor((unsigned char *)in + 16 * i, out, out);
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rk_aes_encrypt(out, out, ks1);
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};
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if (length % 16) {
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memcpy(tmp, in + 16 * i, length % 16);
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xor(tmp, out, out);
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rk_aes_encrypt(out, out, ks1);
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}
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return ret;
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}
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static int compare_string(unsigned char *a, unsigned char *b,
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unsigned int len) {
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unsigned int i;
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if ((a == NULL) || (b == NULL))
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return -1;
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for (i = 0; i < len; i++) {
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if (*a != *b)
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return -1;
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a++;
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b++;
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}
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return 0;
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}
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int rk_aes_cbc_mac_op(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, const int enc) {
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RK_AES_KEY ks1;
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int ret = 0;
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unsigned char tmp_out[16] = {0};
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unsigned int out_len = 16;
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if (in == NULL || out == NULL || key == NULL)
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return -1;
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if (key_len != 128 / 8 && key_len != 192 / 8 && key_len != 256 / 8)
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return -2;
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if (length == 0)
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return -3;
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ret = rk_aes_set_encrypt_key(key, key_len * 8, &ks1);
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if (ret != 0)
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return ret;
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ret = rk_aes_cbc_mac_encrypt(in, length, tmp_out, &ks1, enc);
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if (ret != 0)
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return ret;
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if (enc)
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memcpy(out, tmp_out, out_len);
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else
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ret = compare_string(out, tmp_out, out_len);
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return ret;
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}
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