root/source4/heimdal/lib/hcrypto/camellia.c

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DEFINITIONS

This source file includes following definitions.
  1. CAMELLIA_set_key
  2. CAMELLIA_encrypt
  3. CAMELLIA_decrypt
  4. CAMELLIA_cbc_encrypt

   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 #include <roken.h>
  41 
  42 #ifdef KRB5
  43 #include <krb5-types.h>
  44 #endif
  45 
  46 #include <string.h>
  47 
  48 #include "camellia-ntt.h"
  49 #include "camellia.h"
  50 
  51 int
  52 CAMELLIA_set_key(const unsigned char *userkey,
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  53                  const int bits, CAMELLIA_KEY *key)
  54 {
  55     key->bits = bits;
  56     Camellia_Ekeygen(bits, userkey, key->key);
  57     return 1;
  58 }
  59 
  60 void
  61 CAMELLIA_encrypt(const unsigned char *in, unsigned char *out,
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  62                  const CAMELLIA_KEY *key)
  63 {
  64     Camellia_EncryptBlock(key->bits, in, key->key, out);
  65 
  66 }
  67 
  68 void
  69 CAMELLIA_decrypt(const unsigned char *in, unsigned char *out,
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  70                  const CAMELLIA_KEY *key)
  71 {
  72     Camellia_DecryptBlock(key->bits, in, key->key, out);
  73 }
  74 
  75 void
  76 CAMELLIA_cbc_encrypt(const unsigned char *in, unsigned char *out,
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  77                      unsigned long size, const CAMELLIA_KEY *key,
  78                      unsigned char *iv, int mode_encrypt)
  79 {
  80     unsigned char tmp[CAMELLIA_BLOCK_SIZE];
  81     int i;
  82 
  83     if (mode_encrypt) {
  84         while (size >= CAMELLIA_BLOCK_SIZE) {
  85             for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
  86                 tmp[i] = in[i] ^ iv[i];
  87             CAMELLIA_encrypt(tmp, out, key);
  88             memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
  89             size -= CAMELLIA_BLOCK_SIZE;
  90             in += CAMELLIA_BLOCK_SIZE;
  91             out += CAMELLIA_BLOCK_SIZE;
  92         }
  93         if (size) {
  94             for (i = 0; i < size; i++)
  95                 tmp[i] = in[i] ^ iv[i];
  96             for (i = size; i < CAMELLIA_BLOCK_SIZE; i++)
  97                 tmp[i] = iv[i];
  98             CAMELLIA_encrypt(tmp, out, key);
  99             memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
 100         }
 101     } else {
 102         while (size >= CAMELLIA_BLOCK_SIZE) {
 103             memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 104             CAMELLIA_decrypt(tmp, out, key);
 105             for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
 106                 out[i] ^= iv[i];
 107             memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
 108             size -= CAMELLIA_BLOCK_SIZE;
 109             in += CAMELLIA_BLOCK_SIZE;
 110             out += CAMELLIA_BLOCK_SIZE;
 111         }
 112         if (size) {
 113             memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 114             CAMELLIA_decrypt(tmp, out, key);
 115             for (i = 0; i < size; i++)
 116                 out[i] ^= iv[i];
 117             memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
 118         }
 119     }
 120 }

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