Line data    Source code

       1             : /*
       2             :  * Copyright (c) 2003 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include <config.h>
      35             : #include <roken.h>
      36             : 
      37             : #ifdef KRB5
      38             : #include <krb5-types.h>
      39             : #endif
      40             : 
      41             : #include "rijndael-alg-fst.h"
      42             : #include "aes.h"
      43             : 
      44             : int
      45     9934411 : AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
      46             : {
      47     9934411 :     key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits);
      48     9934411 :     if (key->rounds == 0)
      49           0 :         return -1;
      50     9678858 :     return 0;
      51             : }
      52             : 
      53             : int
      54     5661195 : AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
      55             : {
      56     5661195 :     key->rounds = rijndaelKeySetupDec(key->key, userkey, bits);
      57     5661195 :     if (key->rounds == 0)
      58           0 :         return -1;
      59     5481916 :     return 0;
      60             : }
      61             : 
      62             : void
      63   475935814 : AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
      64             : {
      65   475935814 :     rijndaelEncrypt(key->key, key->rounds, in, out);
      66   475935814 : }
      67             : 
      68             : void
      69   201106982 : AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
      70             : {
      71   201106982 :     rijndaelDecrypt(key->key, key->rounds, in, out);
      72   201106982 : }
      73             : 
      74             : void
      75    19327398 : AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
      76             :                 unsigned long size, const AES_KEY *key,
      77             :                 unsigned char *iv, int forward_encrypt)
      78             : {
      79      315341 :     unsigned char tmp[AES_BLOCK_SIZE];
      80      315341 :     int i;
      81             : 
      82    19327398 :     if (forward_encrypt) {
      83   476838880 :         while (size >= AES_BLOCK_SIZE) {
      84  7870975962 :             for (i = 0; i < AES_BLOCK_SIZE; i++)
      85  7407977376 :                 tmp[i] = in[i] ^ iv[i];
      86   462998586 :             AES_encrypt(tmp, out, key);
      87   462998586 :             memcpy(iv, out, AES_BLOCK_SIZE);
      88   462998586 :             size -= AES_BLOCK_SIZE;
      89   462998586 :             in += AES_BLOCK_SIZE;
      90   462998586 :             out += AES_BLOCK_SIZE;
      91             :         }
      92    13840294 :         if (size) {
      93           0 :             for (i = 0; i < size; i++)
      94           0 :                 tmp[i] = in[i] ^ iv[i];
      95           0 :             for (i = size; i < AES_BLOCK_SIZE; i++)
      96           0 :                 tmp[i] = iv[i];
      97           0 :             AES_encrypt(tmp, out, key);
      98           0 :             memcpy(iv, out, AES_BLOCK_SIZE);
      99             :         }
     100             :     } else {
     101   206594086 :         while (size >= AES_BLOCK_SIZE) {
     102   201106982 :             memcpy(tmp, in, AES_BLOCK_SIZE);
     103   201106982 :             AES_decrypt(tmp, out, key);
     104  3419258987 :             for (i = 0; i < AES_BLOCK_SIZE; i++)
     105  3217711712 :                 out[i] ^= iv[i];
     106   201106982 :             memcpy(iv, tmp, AES_BLOCK_SIZE);
     107   201106982 :             size -= AES_BLOCK_SIZE;
     108   201106982 :             in += AES_BLOCK_SIZE;
     109   201106982 :             out += AES_BLOCK_SIZE;
     110             :         }
     111     5487104 :         if (size) {
     112           0 :             memcpy(tmp, in, AES_BLOCK_SIZE);
     113           0 :             AES_decrypt(tmp, out, key);
     114           0 :             for (i = 0; i < size; i++)
     115           0 :                 out[i] ^= iv[i];
     116           0 :             memcpy(iv, tmp, AES_BLOCK_SIZE);
     117             :         }
     118             :     }
     119    19327398 : }
     120             : 
     121             : void
     122           0 : AES_cfb8_encrypt(const unsigned char *in, unsigned char *out,
     123             :                  unsigned long size, const AES_KEY *key,
     124             :                  unsigned char *iv, int forward_encrypt)
     125             : {
     126           0 :     int i;
     127             : 
     128           0 :     for (i = 0; i < size; i++) {
     129           0 :         unsigned char tmp[AES_BLOCK_SIZE + 1];
     130             : 
     131           0 :         memcpy(tmp, iv, AES_BLOCK_SIZE);
     132           0 :         AES_encrypt(iv, iv, key);
     133           0 :         if (!forward_encrypt) {
     134           0 :             tmp[AES_BLOCK_SIZE] = in[i];
     135             :         }
     136           0 :         out[i] = in[i] ^ iv[0];
     137           0 :         if (forward_encrypt) {
     138           0 :             tmp[AES_BLOCK_SIZE] = out[i];
     139             :         }
     140           0 :         memcpy(iv, &tmp[1], AES_BLOCK_SIZE);
     141             :     }
     142           0 : }