/*

 * 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 <config.h>

#include <roken.h>

#ifdef KRB5

#include <krb5-types.h>

#endif

#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);

    }

}