2025-05-10 21:58:58 +08:00

109 lines
2.6 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "des_core.h"
static void rk_crypto_cbc128_encrypt(void *ctx, const unsigned char *in, unsigned char *out,
int len, unsigned char *ivec, block128_f block)
{
int n;
const unsigned char *iv = ivec;
while (len) {
for(n=0; n<DES_BLOCK_SIZE && n<len; ++n)
out[n] = in[n] ^ iv[n];
for(; n<DES_BLOCK_SIZE; ++n)
out[n] = iv[n];
(*block)(out, out, ctx);
iv = out;
if (len<=DES_BLOCK_SIZE) break;
len -= DES_BLOCK_SIZE;
in += DES_BLOCK_SIZE;
out += DES_BLOCK_SIZE;
}
memcpy(ivec,iv,DES_BLOCK_SIZE);
}
static void rk_crypto_cbc128_decrypt(void *ctx, const unsigned char *in, unsigned char *out,
int len, unsigned char *ivec, block128_f block)
{
int n;
unsigned char c;
unsigned char tmp_buf[DES_BLOCK_SIZE];
memset(tmp_buf, 0x00, sizeof(tmp_buf));
while (len) {
(*block)(in, tmp_buf,ctx);
for(n=0; n<DES_BLOCK_SIZE && n<len; ++n) {
c = in[n];
out[n] = tmp_buf[n] ^ ivec[n];
ivec[n] = c;
}
if (len<=DES_BLOCK_SIZE) {
for (; n<DES_BLOCK_SIZE; ++n)
ivec[n] = in[n];
break;
}
len -= DES_BLOCK_SIZE;
in += DES_BLOCK_SIZE;
out += DES_BLOCK_SIZE;
}
}
int rk_des_cbc_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;
if(key_len != 8 && key_len != 16 && key_len != 24)
return -1;
if(length%DES_BLOCK_SIZE)
return -1;
if (enc) {
switch(key_len){
case 8:
rk_des_setkey_enc(&ctx, key);
rk_crypto_cbc128_encrypt((void*)&ctx, in, out, length, ivec, rk_des_crypt_ecb);
break;
case 16:
rk_des3_set2key_enc(&ctx3, key);
rk_crypto_cbc128_encrypt((void*)&ctx3, in, out, length, ivec, rk_des3_crypt_ecb);
break;
case 24:
rk_des3_set3key_enc(&ctx3, key);
rk_crypto_cbc128_encrypt((void*)&ctx3, in, out, length, ivec, rk_des3_crypt_ecb);
break;
default:
return -1;
}
} else {
switch(key_len){
case 8:
rk_des_setkey_dec(&ctx, key);
rk_crypto_cbc128_decrypt((void*)&ctx, in, out, length, ivec, rk_des_crypt_ecb);
break;
case 16:
rk_des3_set2key_dec(&ctx3, key);
rk_crypto_cbc128_decrypt((void*)&ctx3, in, out, length, ivec, rk_des3_crypt_ecb);
break;
case 24:
rk_des3_set3key_dec(&ctx3, key);
rk_crypto_cbc128_decrypt((void*)&ctx3, in, out, length, ivec, rk_des3_crypt_ecb);
break;
default:
return -1;
}
}
return 0;
}