lib/hcrypto/camellia.c

   1 /*
   2  * Copyright (c) 2007 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 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36
  37 RCSID("$Id: aes.c 20466 2007-04-20 08:29:05Z lha $");
  38 #endif
  39
  40 #ifdef KRB5
  41 #include <krb5-types.h>
  42 #endif
  43
  44 #include <string.h>
  45
  46 #include "camellia-ntt.h"
  47 #include "camellia.h"
  48
  49 int
  50 CAMELLIA_set_key(const unsigned char *userkey,
  51                  const int bits, CAMELLIA_KEY *key)
  52 {
  53     key->bits = bits;
  54     Camellia_Ekeygen(bits, userkey, key->key);
  55     return 1;
  56 }
  57
  58 void
  59 CAMELLIA_encrypt(const unsigned char *in, unsigned char *out,
  60                  const CAMELLIA_KEY *key)
  61 {
  62     Camellia_EncryptBlock(key->bits, in, key->key, out);
  63
  64 }
  65
  66 void
  67 CAMELLIA_decrypt(const unsigned char *in, unsigned char *out,
  68                  const CAMELLIA_KEY *key)
  69 {
  70     Camellia_DecryptBlock(key->bits, in, key->key, out);
  71 }
  72
  73 void
  74 CAMELLIA_cbc_encrypt(const unsigned char *in, unsigned char *out,
  75                      unsigned long size, const CAMELLIA_KEY *key,
  76                      unsigned char *iv, int mode_encrypt)
  77 {
  78     unsigned char tmp[CAMELLIA_BLOCK_SIZE];
  79     int i;
  80
  81     if (mode_encrypt) {
  82         while (size >= CAMELLIA_BLOCK_SIZE) {
  83             for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
  84                 tmp[i] = in[i] ^ iv[i];
  85             CAMELLIA_encrypt(tmp, out, key);
  86             memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
  87             size -= CAMELLIA_BLOCK_SIZE;
  88             in += CAMELLIA_BLOCK_SIZE;
  89             out += CAMELLIA_BLOCK_SIZE;
  90         }
  91         if (size) {
  92             for (i = 0; i < size; i++)
  93                 tmp[i] = in[i] ^ iv[i];
  94             for (i = size; i < CAMELLIA_BLOCK_SIZE; i++)
  95                 tmp[i] = iv[i];
  96             CAMELLIA_encrypt(tmp, out, key);
  97             memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
  98         }
  99     } else {
 100         while (size >= CAMELLIA_BLOCK_SIZE) {
 101             memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 102             CAMELLIA_decrypt(tmp, out, key);
 103             for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
 104                 out[i] ^= iv[i];
 105             memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
 106             size -= CAMELLIA_BLOCK_SIZE;
 107             in += CAMELLIA_BLOCK_SIZE;
 108             out += CAMELLIA_BLOCK_SIZE;
 109         }
 110         if (size) {
 111             memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 112             CAMELLIA_decrypt(tmp, out, key);
 113             for (i = 0; i < size; i++)
 114                 out[i] ^= iv[i];
 115             memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
 116         }
 117     }
 118 }