#include "config.h"
#ifdef KRB5
#include <krb5-types.h>
#endif
#include <string.h>
#include "rijndael-alg-fst.h"
#include "aes.h"
int
AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
{
key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits);
if (key->rounds == 0)
return -1;
return 0;
}
int
AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
{
key->rounds = rijndaelKeySetupDec(key->key, userkey, bits);
if (key->rounds == 0)
return -1;
return 0;
}
void
AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
{
rijndaelEncrypt(key->key, key->rounds, in, out);
}
void
AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
{
rijndaelDecrypt(key->key, key->rounds, in, out);
}
void
AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
unsigned long size, const AES_KEY *key,
unsigned char *iv, int forward_encrypt)
{
unsigned char tmp[AES_BLOCK_SIZE];
int i;
if (forward_encrypt) {
while (size >= AES_BLOCK_SIZE) {
for (i = 0; i < AES_BLOCK_SIZE; i++)
tmp[i] = in[i] ^ iv[i];
AES_encrypt(tmp, out, key);
memcpy(iv, out, AES_BLOCK_SIZE);
size -= AES_BLOCK_SIZE;
in += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
}
if (size) {
for (i = 0; i < size; i++)
tmp[i] = in[i] ^ iv[i];
for (i = size; i < AES_BLOCK_SIZE; i++)
tmp[i] = iv[i];
AES_encrypt(tmp, out, key);
memcpy(iv, out, AES_BLOCK_SIZE);
}
} else {
while (size >= AES_BLOCK_SIZE) {
memcpy(tmp, in, AES_BLOCK_SIZE);
AES_decrypt(tmp, out, key);
for (i = 0; i < AES_BLOCK_SIZE; i++)
out[i] ^= iv[i];
memcpy(iv, tmp, AES_BLOCK_SIZE);
size -= AES_BLOCK_SIZE;
in += AES_BLOCK_SIZE;
out += AES_BLOCK_SIZE;
}
if (size) {
memcpy(tmp, in, AES_BLOCK_SIZE);
AES_decrypt(tmp, out, key);
for (i = 0; i < size; i++)
out[i] ^= iv[i];
memcpy(iv, tmp, AES_BLOCK_SIZE);
}
}
}
void
AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
unsigned long size, const AES_KEY *key,
unsigned char *iv, int forward_encrypt)
{
int i;
for (i = 0; i < size; i++) {
unsigned char tmp[AES_BLOCK_SIZE + 1];
memcpy(tmp, iv, AES_BLOCK_SIZE);
AES_encrypt(iv, iv, key);
if (!forward_encrypt) {
tmp[AES_BLOCK_SIZE] = in[i];
}
out[i] = in[i] ^ iv[0];
if (forward_encrypt) {
tmp[AES_BLOCK_SIZE] = out[i];
}
memcpy(iv, &tmp[1], AES_BLOCK_SIZE);
}
}