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