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/*
* Copyright (c) 2003 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "replace.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 uint8_t *in, uint8_t *out,
size_t length, const AES_KEY *key,
uint8_t *iv, int forward)
{
size_t i;
for (i=0; i < length; i++) {
uint8_t tiv[AES_BLOCK_SIZE*2];
memcpy(tiv, iv, AES_BLOCK_SIZE);
AES_encrypt(iv, iv, key);
if (!forward) {
tiv[AES_BLOCK_SIZE] = in[i];
}
out[i] = in[i] ^ iv[0];
if (forward) {
tiv[AES_BLOCK_SIZE] = out[i];
}
memcpy(iv, tiv+1, AES_BLOCK_SIZE);
}
}
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