crypto/des/xcbc_enc.c

   1 /* crypto/des/xcbc_enc.c */
   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 /* RSA's DESX */
  62
  63 static unsigned char desx_white_in2out[256]={
  64 0xBD,0x56,0xEA,0xF2,0xA2,0xF1,0xAC,0x2A,0xB0,0x93,0xD1,0x9C,0x1B,0x33,0xFD,0xD0,
  65 0x30,0x04,0xB6,0xDC,0x7D,0xDF,0x32,0x4B,0xF7,0xCB,0x45,0x9B,0x31,0xBB,0x21,0x5A,
  66 0x41,0x9F,0xE1,0xD9,0x4A,0x4D,0x9E,0xDA,0xA0,0x68,0x2C,0xC3,0x27,0x5F,0x80,0x36,
  67 0x3E,0xEE,0xFB,0x95,0x1A,0xFE,0xCE,0xA8,0x34,0xA9,0x13,0xF0,0xA6,0x3F,0xD8,0x0C,
  68 0x78,0x24,0xAF,0x23,0x52,0xC1,0x67,0x17,0xF5,0x66,0x90,0xE7,0xE8,0x07,0xB8,0x60,
  69 0x48,0xE6,0x1E,0x53,0xF3,0x92,0xA4,0x72,0x8C,0x08,0x15,0x6E,0x86,0x00,0x84,0xFA,
  70 0xF4,0x7F,0x8A,0x42,0x19,0xF6,0xDB,0xCD,0x14,0x8D,0x50,0x12,0xBA,0x3C,0x06,0x4E,
  71 0xEC,0xB3,0x35,0x11,0xA1,0x88,0x8E,0x2B,0x94,0x99,0xB7,0x71,0x74,0xD3,0xE4,0xBF,
  72 0x3A,0xDE,0x96,0x0E,0xBC,0x0A,0xED,0x77,0xFC,0x37,0x6B,0x03,0x79,0x89,0x62,0xC6,
  73 0xD7,0xC0,0xD2,0x7C,0x6A,0x8B,0x22,0xA3,0x5B,0x05,0x5D,0x02,0x75,0xD5,0x61,0xE3,
  74 0x18,0x8F,0x55,0x51,0xAD,0x1F,0x0B,0x5E,0x85,0xE5,0xC2,0x57,0x63,0xCA,0x3D,0x6C,
  75 0xB4,0xC5,0xCC,0x70,0xB2,0x91,0x59,0x0D,0x47,0x20,0xC8,0x4F,0x58,0xE0,0x01,0xE2,
  76 0x16,0x38,0xC4,0x6F,0x3B,0x0F,0x65,0x46,0xBE,0x7E,0x2D,0x7B,0x82,0xF9,0x40,0xB5,
  77 0x1D,0x73,0xF8,0xEB,0x26,0xC7,0x87,0x97,0x25,0x54,0xB1,0x28,0xAA,0x98,0x9D,0xA5,
  78 0x64,0x6D,0x7A,0xD4,0x10,0x81,0x44,0xEF,0x49,0xD6,0xAE,0x2E,0xDD,0x76,0x5C,0x2F,
  79 0xA7,0x1C,0xC9,0x09,0x69,0x9A,0x83,0xCF,0x29,0x39,0xB9,0xE9,0x4C,0xFF,0x43,0xAB,
  80         };
  81
  82 void des_xwhite_in2out(key,in,out)
  83 const des_cblock key;
  84 const des_cblock in;
  85 des_cblock out;
  86         {
  87         int out0,out1;
  88         int i;
  89
  90         out[0]=out[1]=out[2]=out[3]=out[4]=out[5]=out[6]=out[7]=0;
  91         out0=out1=0;
  92         for (i=0; i<8; i++)
  93                 {
  94                 out[i]=key[i]^desx_white_in2out[out0^out1];
  95                 out0=out1;
  96                 out1=(int)out[i&0x07];
  97                 }
  98
  99         out0=out[0];
 100         out1=out[i];
 101         for (i=0; i<8; i++)
 102                 {
 103                 out[i]=in[i]^desx_white_in2out[out0^out1];
 104                 out0=out1;
 105                 out1=(int)out[i&0x07];
 106                 }
 107         }
 108
 109 void des_xcbc_encrypt(in, out, length, schedule, ivec, inw,outw,enc)
 110 const unsigned char *in;
 111 unsigned char *out;
 112 long length;
 113 des_key_schedule schedule;
 114 des_cblock ivec;
 115 const des_cblock inw;
 116 const des_cblock outw;
 117 int enc;
 118         {
 119         register DES_LONG tin0,tin1;
 120         register DES_LONG tout0,tout1,xor0,xor1;
 121         register DES_LONG inW0,inW1,outW0,outW1;
 122         register const unsigned char *in2;
 123         register long l=length;
 124         DES_LONG tin[2];
 125         unsigned char *iv;
 126
 127         in2=inw;
 128         c2l(in2,inW0);
 129         c2l(in2,inW1);
 130         in2=outw;
 131         c2l(in2,outW0);
 132         c2l(in2,outW1);
 133
 134         iv=ivec;
 135
 136         if (enc)
 137                 {
 138                 c2l(iv,tout0);
 139                 c2l(iv,tout1);
 140                 for (l-=8; l>=0; l-=8)
 141                         {
 142                         c2l(in,tin0);
 143                         c2l(in,tin1);
 144                         tin0^=tout0^inW0; tin[0]=tin0;
 145                         tin1^=tout1^inW1; tin[1]=tin1;
 146                         des_encrypt(tin,schedule,DES_ENCRYPT);
 147                         tout0=tin[0]^outW0; l2c(tout0,out);
 148                         tout1=tin[1]^outW1; l2c(tout1,out);
 149                         }
 150                 if (l != -8)
 151                         {
 152                         c2ln(in,tin0,tin1,l+8);
 153                         tin0^=tout0^inW0; tin[0]=tin0;
 154                         tin1^=tout1^inW1; tin[1]=tin1;
 155                         des_encrypt(tin,schedule,DES_ENCRYPT);
 156                         tout0=tin[0]^outW0; l2c(tout0,out);
 157                         tout1=tin[1]^outW1; l2c(tout1,out);
 158                         }
 159                 iv=ivec;
 160                 l2c(tout0,iv);
 161                 l2c(tout1,iv);
 162                 }
 163         else
 164                 {
 165                 c2l(iv,xor0);
 166                 c2l(iv,xor1);
 167                 for (l-=8; l>0; l-=8)
 168                         {
 169                         c2l(in,tin0); tin[0]=tin0^outW0;
 170                         c2l(in,tin1); tin[1]=tin1^outW1;
 171                         des_encrypt(tin,schedule,DES_DECRYPT);
 172                         tout0=tin[0]^xor0^inW0;
 173                         tout1=tin[1]^xor1^inW1;
 174                         l2c(tout0,out);
 175                         l2c(tout1,out);
 176                         xor0=tin0;
 177                         xor1=tin1;
 178                         }
 179                 if (l != -8)
 180                         {
 181                         c2l(in,tin0); tin[0]=tin0^outW0;
 182                         c2l(in,tin1); tin[1]=tin1^outW1;
 183                         des_encrypt(tin,schedule,DES_DECRYPT);
 184                         tout0=tin[0]^xor0^inW0;
 185                         tout1=tin[1]^xor1^inW1;
 186                         l2cn(tout0,tout1,out,l+8);
 187                         xor0=tin0;
 188                         xor1=tin1;
 189                         }
 190
 191                 iv=ivec;
 192                 l2c(xor0,iv);
 193                 l2c(xor1,iv);
 194                 }
 195         tin0=tin1=tout0=tout1=xor0=xor1=0;
 196         inW0=inW1=outW0=outW1=0;
 197         tin[0]=tin[1]=0;
 198         }
 199