80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include "des_core.h"
|
|
|
|
static void rk_crypto_cfb128_encrypt(void *ctx, const unsigned char *in, unsigned char *out,
|
|
size_t len, unsigned char ivec[DES_BLOCK_SIZE], int *num,
|
|
int enc, block128_f block)
|
|
{
|
|
unsigned int n;
|
|
size_t l = 0;
|
|
|
|
n = *num;
|
|
if (enc) {
|
|
|
|
while (l<len) {
|
|
if (n == 0) {
|
|
(*block)(ivec, ivec, ctx);
|
|
}
|
|
out[l] = ivec[n] ^= in[l];
|
|
++l;
|
|
n = (n+1) % DES_BLOCK_SIZE;
|
|
}
|
|
*num = n;
|
|
} else {
|
|
while (l<len) {
|
|
unsigned char c;
|
|
if (n == 0) {
|
|
(*block)(ivec, ivec, ctx);
|
|
}
|
|
out[l] = ivec[n] ^ (c = in[l]); ivec[n] = c;
|
|
++l;
|
|
n = (n+1) % DES_BLOCK_SIZE;
|
|
}
|
|
*num=n;
|
|
}
|
|
}
|
|
|
|
int rk_des_cfb_encrypt(const unsigned char *in, unsigned char *out,
|
|
unsigned long length, const unsigned char *key, const int key_len,
|
|
unsigned char *ivec, const int enc)
|
|
{
|
|
rk_des_context ctx;
|
|
rk_des3_context ctx3;
|
|
int num = 0;
|
|
|
|
if (in == NULL || out ==NULL || key == NULL)
|
|
return -1;
|
|
|
|
if (key_len != 8 && key_len != 16 && key_len != 24)
|
|
return -2;
|
|
|
|
if(length == 0)
|
|
return -3;
|
|
|
|
switch(key_len){
|
|
case 8:
|
|
rk_des_setkey_enc(&ctx, key);
|
|
rk_crypto_cfb128_encrypt((void *)&ctx, in, out,length, ivec,
|
|
&num,enc, rk_des_crypt_ecb);
|
|
break;
|
|
case 16:
|
|
rk_des3_set2key_enc(&ctx3, key);
|
|
rk_crypto_cfb128_encrypt((void *)&ctx3, in, out,length, ivec,
|
|
&num,enc, rk_des3_crypt_ecb);
|
|
break;
|
|
case 24:
|
|
rk_des3_set3key_enc(&ctx3, key);
|
|
rk_crypto_cfb128_encrypt((void *)&ctx3, in, out,length, ivec,
|
|
&num,enc, rk_des3_crypt_ecb);
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|