crypto/camellia/cmll_cbc.c

   1 /* crypto/camellia/camellia_cbc.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* ====================================================================
   3  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in
  14  *    the documentation and/or other materials provided with the
  15  *    distribution.
  16  *
  17  * 3. All advertising materials mentioning features or use of this
  18  *    software must display the following acknowledgment:
  19  *    "This product includes software developed by the OpenSSL Project
  20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  21  *
  22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  23  *    endorse or promote products derived from this software without
  24  *    prior written permission. For written permission, please contact
  25  *    openssl-core@openssl.org.
  26  *
  27  * 5. Products derived from this software may not be called "OpenSSL"
  28  *    nor may "OpenSSL" appear in their names without prior written
  29  *    permission of the OpenSSL Project.
  30  *
  31  * 6. Redistributions of any form whatsoever must retain the following
  32  *    acknowledgment:
  33  *    "This product includes software developed by the OpenSSL Project
  34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  35  *
  36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  47  * OF THE POSSIBILITY OF SUCH DAMAGE.
  48  * ====================================================================
  49  *
  50  */
  51
  52 #ifndef CAMELLIA_DEBUG
  53 # ifndef NDEBUG
  54 #  define NDEBUG
  55 # endif
  56 #endif
  57 #include <assert.h>
  58 #include <string.h>
  59
  60 #include <openssl/camellia.h>
  61 #include "cmll_locl.h"
  62 void Camellia_cbc_encrypt(const unsigned char *in, unsigned char *out,
  63         size_t len, const CAMELLIA_KEY *key,
  64         unsigned char *ivec, const int enc)
  65         {
  66
  67         size_t n;
  68         unsigned char tmp[CAMELLIA_BLOCK_SIZE];
  69         const unsigned char *iv = ivec;
  70
  71         assert(in && out && key && ivec);
  72         assert((CAMELLIA_ENCRYPT == enc)||(CAMELLIA_DECRYPT == enc));
  73
  74         if (CAMELLIA_ENCRYPT == enc)
  75                 {
  76                 while (len >= CAMELLIA_BLOCK_SIZE)
  77                         {
  78                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
  79                                 out[n] = in[n] ^ iv[n];
  80                         Camellia_encrypt(out, out, key);
  81                         iv = out;
  82                         len -= CAMELLIA_BLOCK_SIZE;
  83                         in += CAMELLIA_BLOCK_SIZE;
  84                         out += CAMELLIA_BLOCK_SIZE;
  85                         }
  86                 if (len)
  87                         {
  88                         for(n=0; n < len; ++n)
  89                                 out[n] = in[n] ^ iv[n];
  90                         for(n=len; n < CAMELLIA_BLOCK_SIZE; ++n)
  91                                 out[n] = iv[n];
  92                         Camellia_encrypt(out, out, key);
  93                         iv = out;
  94                         }
  95                 memcpy(ivec,iv,CAMELLIA_BLOCK_SIZE);
  96                 }
  97         else if (in != out)
  98                 {
  99                 while (len >= CAMELLIA_BLOCK_SIZE)
 100                         {
 101                         Camellia_decrypt(in, out, key);
 102                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
 103                                 out[n] ^= iv[n];
 104                         iv = in;
 105                         len -= CAMELLIA_BLOCK_SIZE;
 106                         in  += CAMELLIA_BLOCK_SIZE;
 107                         out += CAMELLIA_BLOCK_SIZE;
 108                         }
 109                 if (len)
 110                         {
 111                         Camellia_decrypt(in,tmp,key);
 112                         for(n=0; n < len; ++n)
 113                                 out[n] = tmp[n] ^ iv[n];
 114                         iv = in;
 115                         }
 116                 memcpy(ivec,iv,CAMELLIA_BLOCK_SIZE);
 117                 }
 118         else
 119                 {
 120                 while (len >= CAMELLIA_BLOCK_SIZE)
 121                         {
 122                         memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 123                         Camellia_decrypt(in, out, key);
 124                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
 125                                 out[n] ^= ivec[n];
 126                         memcpy(ivec, tmp, CAMELLIA_BLOCK_SIZE);
 127                         len -= CAMELLIA_BLOCK_SIZE;
 128                         in += CAMELLIA_BLOCK_SIZE;
 129                         out += CAMELLIA_BLOCK_SIZE;
 130                         }
 131                 if (len)
 132                         {
 133                         memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
 134                         Camellia_decrypt(tmp, out, key);
 135                         for(n=0; n < len; ++n)
 136                                 out[n] ^= ivec[n];
 137                         for(n=len; n < CAMELLIA_BLOCK_SIZE; ++n)
 138                                 out[n] = tmp[n];
 139                         memcpy(ivec, tmp, CAMELLIA_BLOCK_SIZE);
 140                         }
 141                 }
 142         }