crypto/openssl-0.9/crypto/camellia/cmll_cfb.c

   1 /* crypto/camellia/camellia_cfb.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 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  52  * All rights reserved.
  53  *
  54  * This package is an SSL implementation written
  55  * by Eric Young (eay@cryptsoft.com).
  56  * The implementation was written so as to conform with Netscapes SSL.
  57  *
  58  * This library is free for commercial and non-commercial use as long as
  59  * the following conditions are aheared to.  The following conditions
  60  * apply to all code found in this distribution, be it the RC4, RSA,
  61  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  62  * included with this distribution is covered by the same copyright terms
  63  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  64  *
  65  * Copyright remains Eric Young's, and as such any Copyright notices in
  66  * the code are not to be removed.
  67  * If this package is used in a product, Eric Young should be given attribution
  68  * as the author of the parts of the library used.
  69  * This can be in the form of a textual message at program startup or
  70  * in documentation (online or textual) provided with the package.
  71  *
  72  * Redistribution and use in source and binary forms, with or without
  73  * modification, are permitted provided that the following conditions
  74  * are met:
  75  * 1. Redistributions of source code must retain the copyright
  76  *    notice, this list of conditions and the following disclaimer.
  77  * 2. Redistributions in binary form must reproduce the above copyright
  78  *    notice, this list of conditions and the following disclaimer in the
  79  *    documentation and/or other materials provided with the distribution.
  80  * 3. All advertising materials mentioning features or use of this software
  81  *    must display the following acknowledgement:
  82  *    "This product includes cryptographic software written by
  83  *     Eric Young (eay@cryptsoft.com)"
  84  *    The word 'cryptographic' can be left out if the rouines from the library
  85  *    being used are not cryptographic related :-).
  86  * 4. If you include any Windows specific code (or a derivative thereof) from
  87  *    the apps directory (application code) you must include an acknowledgement:
  88  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  89  *
  90  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  91  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  92  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  93  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  94  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  95  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  96  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  97  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  98  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  99  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 100  * SUCH DAMAGE.
 101  *
 102  * The licence and distribution terms for any publically available version or
 103  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 104  * copied and put under another distribution licence
 105  * [including the GNU Public Licence.]
 106  */
 107
 108 #ifndef CAMELLIA_DEBUG
 109 # ifndef NDEBUG
 110 #  define NDEBUG
 111 # endif
 112 #endif
 113 #include <assert.h>
 114 #include <string.h>
 115
 116 #include <openssl/camellia.h>
 117 #include "cmll_locl.h"
 118 #include "e_os.h"
 119
 120
 121 /* The input and output encrypted as though 128bit cfb mode is being
 122  * used.  The extra state information to record how much of the
 123  * 128bit block we have used is contained in *num;
 124  */
 125
 126 void Camellia_cfb128_encrypt(const unsigned char *in, unsigned char *out,
 127         const unsigned long length, const CAMELLIA_KEY *key,
 128         unsigned char *ivec, int *num, const int enc)
 129         {
 130
 131         unsigned int n;
 132         unsigned long l = length;
 133         unsigned char c;
 134
 135         assert(in && out && key && ivec && num);
 136
 137         n = *num;
 138
 139         if (enc)
 140                 {
 141                 while (l--)
 142                         {
 143                         if (n == 0)
 144                                 {
 145                                 Camellia_encrypt(ivec, ivec, key);
 146                                 }
 147                         ivec[n] = *(out++) = *(in++) ^ ivec[n];
 148                         n = (n+1) % CAMELLIA_BLOCK_SIZE;
 149                         }
 150                 }
 151         else
 152                 {
 153                 while (l--)
 154                         {
 155                         if (n == 0)
 156                                 {
 157                                 Camellia_encrypt(ivec, ivec, key);
 158                                 }
 159                         c = *(in);
 160                         *(out++) = *(in++) ^ ivec[n];
 161                         ivec[n] = c;
 162                         n = (n+1) % CAMELLIA_BLOCK_SIZE;
 163                         }
 164                 }
 165
 166         *num=n;
 167         }
 168
 169 /* This expects a single block of size nbits for both in and out. Note that
 170    it corrupts any extra bits in the last byte of out */
 171 void Camellia_cfbr_encrypt_block(const unsigned char *in,unsigned char *out,
 172         const int nbits,const CAMELLIA_KEY *key,
 173         unsigned char *ivec,const int enc)
 174         {
 175         int n,rem,num;
 176         unsigned char ovec[CAMELLIA_BLOCK_SIZE*2];
 177
 178         if (nbits<=0 || nbits>128) return;
 179
 180         /* fill in the first half of the new IV with the current IV */
 181         memcpy(ovec,ivec,CAMELLIA_BLOCK_SIZE);
 182         /* construct the new IV */
 183         Camellia_encrypt(ivec,ivec,key);
 184         num = (nbits+7)/8;
 185         if (enc)        /* encrypt the input */
 186                 for(n=0 ; n < num ; ++n)
 187                         out[n] = (ovec[CAMELLIA_BLOCK_SIZE+n] = in[n] ^ ivec[n]);
 188         else            /* decrypt the input */
 189                 for(n=0 ; n < num ; ++n)
 190                         out[n] = (ovec[CAMELLIA_BLOCK_SIZE+n] = in[n]) ^ ivec[n];
 191         /* shift ovec left... */
 192         rem = nbits%8;
 193         num = nbits/8;
 194         if(rem==0)
 195                 memcpy(ivec,ovec+num,CAMELLIA_BLOCK_SIZE);
 196         else
 197                 for(n=0 ; n < CAMELLIA_BLOCK_SIZE ; ++n)
 198                         ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem);
 199
 200         /* it is not necessary to cleanse ovec, since the IV is not secret */
 201         }
 202
 203 /* N.B. This expects the input to be packed, MS bit first */
 204 void Camellia_cfb1_encrypt(const unsigned char *in, unsigned char *out,
 205         const unsigned long length, const CAMELLIA_KEY *key,
 206         unsigned char *ivec, int *num, const int enc)
 207         {
 208         unsigned int n;
 209         unsigned char c[1],d[1];
 210
 211         assert(in && out && key && ivec && num);
 212         assert(*num == 0);
 213
 214         memset(out,0,(length+7)/8);
 215         for(n=0 ; n < length ; ++n)
 216                 {
 217                 c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0;
 218                 Camellia_cfbr_encrypt_block(c,d,1,key,ivec,enc);
 219                 out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8));
 220                 }
 221         }
 222
 223 void Camellia_cfb8_encrypt(const unsigned char *in, unsigned char *out,
 224         const unsigned long length, const CAMELLIA_KEY *key,
 225         unsigned char *ivec, int *num, const int enc)
 226         {
 227         unsigned int n;
 228
 229         assert(in && out && key && ivec && num);
 230         assert(*num == 0);
 231
 232         for(n=0 ; n < length ; ++n)
 233                 Camellia_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc);
 234         }
 235