lib/libcrypto/des/cfb64ede.c

   1 /* $OpenBSD: cfb64ede.c,v 1.9 2015/02/07 13:19:15 doug Exp $ */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include "des_locl.h"
  60
  61 /* The input and output encrypted as though 64bit cfb mode is being
  62  * used.  The extra state information to record how much of the
  63  * 64bit block we have used is contained in *num;
  64  */
  65
  66 void DES_ede3_cfb64_encrypt(const unsigned char *in, unsigned char *out,
  67                             long length, DES_key_schedule *ks1,
  68                             DES_key_schedule *ks2, DES_key_schedule *ks3,
  69                             DES_cblock *ivec, int *num, int enc)
  70         {
  71         DES_LONG v0,v1;
  72         long l=length;
  73         int n= *num;
  74         DES_LONG ti[2];
  75         unsigned char *iv,c,cc;
  76
  77         iv=&(*ivec)[0];
  78         if (enc)
  79                 {
  80                 while (l--)
  81                         {
  82                         if (n == 0)
  83                                 {
  84                                 c2l(iv,v0);
  85                                 c2l(iv,v1);
  86
  87                                 ti[0]=v0;
  88                                 ti[1]=v1;
  89                                 DES_encrypt3(ti,ks1,ks2,ks3);
  90                                 v0=ti[0];
  91                                 v1=ti[1];
  92
  93                                 iv = &(*ivec)[0];
  94                                 l2c(v0,iv);
  95                                 l2c(v1,iv);
  96                                 iv = &(*ivec)[0];
  97                                 }
  98                         c= *(in++)^iv[n];
  99                         *(out++)=c;
 100                         iv[n]=c;
 101                         n=(n+1)&0x07;
 102                         }
 103                 }
 104         else
 105                 {
 106                 while (l--)
 107                         {
 108                         if (n == 0)
 109                                 {
 110                                 c2l(iv,v0);
 111                                 c2l(iv,v1);
 112
 113                                 ti[0]=v0;
 114                                 ti[1]=v1;
 115                                 DES_encrypt3(ti,ks1,ks2,ks3);
 116                                 v0=ti[0];
 117                                 v1=ti[1];
 118
 119                                 iv = &(*ivec)[0];
 120                                 l2c(v0,iv);
 121                                 l2c(v1,iv);
 122                                 iv = &(*ivec)[0];
 123                                 }
 124                         cc= *(in++);
 125                         c=iv[n];
 126                         iv[n]=cc;
 127                         *(out++)=c^cc;
 128                         n=(n+1)&0x07;
 129                         }
 130                 }
 131         v0=v1=ti[0]=ti[1]=c=cc=0;
 132         *num=n;
 133         }
 134
 135 /* This is compatible with the single key CFB-r for DES, even thought that's
 136  * not what EVP needs.
 137  */
 138
 139 void DES_ede3_cfb_encrypt(const unsigned char *in,unsigned char *out,
 140                           int numbits,long length,DES_key_schedule *ks1,
 141                           DES_key_schedule *ks2,DES_key_schedule *ks3,
 142                           DES_cblock *ivec,int enc)
 143         {
 144         DES_LONG d0,d1,v0,v1;
 145         unsigned long l=length,n=((unsigned int)numbits+7)/8;
 146         int num=numbits,i;
 147         DES_LONG ti[2];
 148         unsigned char *iv;
 149         unsigned char ovec[16];
 150
 151         if (num > 64) return;
 152         iv = &(*ivec)[0];
 153         c2l(iv,v0);
 154         c2l(iv,v1);
 155         if (enc)
 156                 {
 157                 while (l >= n)
 158                         {
 159                         l-=n;
 160                         ti[0]=v0;
 161                         ti[1]=v1;
 162                         DES_encrypt3(ti,ks1,ks2,ks3);
 163                         c2ln(in,d0,d1,n);
 164                         in+=n;
 165                         d0^=ti[0];
 166                         d1^=ti[1];
 167                         l2cn(d0,d1,out,n);
 168                         out+=n;
 169                         /* 30-08-94 - eay - changed because l>>32 and
 170                          * l<<32 are bad under gcc :-( */
 171                         if (num == 32)
 172                                 { v0=v1; v1=d0; }
 173                         else if (num == 64)
 174                                 { v0=d0; v1=d1; }
 175                         else
 176                                 {
 177                                 iv=&ovec[0];
 178                                 l2c(v0,iv);
 179                                 l2c(v1,iv);
 180                                 l2c(d0,iv);
 181                                 l2c(d1,iv);
 182                                 /* shift ovec left most of the bits... */
 183                                 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
 184                                 /* now the remaining bits */
 185                                 if(num%8 != 0)
 186                                         for(i=0 ; i < 8 ; ++i)
 187                                                 {
 188                                                 ovec[i]<<=num%8;
 189                                                 ovec[i]|=ovec[i+1]>>(8-num%8);
 190                                                 }
 191                                 iv=&ovec[0];
 192                                 c2l(iv,v0);
 193                                 c2l(iv,v1);
 194                                 }
 195                         }
 196                 }
 197         else
 198                 {
 199                 while (l >= n)
 200                         {
 201                         l-=n;
 202                         ti[0]=v0;
 203                         ti[1]=v1;
 204                         DES_encrypt3(ti,ks1,ks2,ks3);
 205                         c2ln(in,d0,d1,n);
 206                         in+=n;
 207                         /* 30-08-94 - eay - changed because l>>32 and
 208                          * l<<32 are bad under gcc :-( */
 209                         if (num == 32)
 210                                 { v0=v1; v1=d0; }
 211                         else if (num == 64)
 212                                 { v0=d0; v1=d1; }
 213                         else
 214                                 {
 215                                 iv=&ovec[0];
 216                                 l2c(v0,iv);
 217                                 l2c(v1,iv);
 218                                 l2c(d0,iv);
 219                                 l2c(d1,iv);
 220                                 /* shift ovec left most of the bits... */
 221                                 memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));
 222                                 /* now the remaining bits */
 223                                 if(num%8 != 0)
 224                                         for(i=0 ; i < 8 ; ++i)
 225                                                 {
 226                                                 ovec[i]<<=num%8;
 227                                                 ovec[i]|=ovec[i+1]>>(8-num%8);
 228                                                 }
 229                                 iv=&ovec[0];
 230                                 c2l(iv,v0);
 231                                 c2l(iv,v1);
 232                                 }
 233                         d0^=ti[0];
 234                         d1^=ti[1];
 235                         l2cn(d0,d1,out,n);
 236                         out+=n;
 237                         }
 238                 }
 239         iv = &(*ivec)[0];
 240         l2c(v0,iv);
 241         l2c(v1,iv);
 242         v0=v1=d0=d1=ti[0]=ti[1]=0;
 243         }
 244