crypto/bf/asm/bf-586.pl

   1 #! /usr/bin/env perl
   2 # Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  11 push(@INC,"${dir}","${dir}../../perlasm");
  12 require "x86asm.pl";
  13 require "cbc.pl";
  14
  15 $output = pop;
  16 open STDOUT,">$output";
  17
  18 &asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
  19
  20 $BF_ROUNDS=16;
  21 $BF_OFF=($BF_ROUNDS+2)*4;
  22 $L="edi";
  23 $R="esi";
  24 $P="ebp";
  25 $tmp1="eax";
  26 $tmp2="ebx";
  27 $tmp3="ecx";
  28 $tmp4="edx";
  29
  30 &BF_encrypt("BF_encrypt",1);
  31 &BF_encrypt("BF_decrypt",0);
  32 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
  33 &asm_finish();
  34
  35 close STDOUT;
  36
  37 sub BF_encrypt
  38         {
  39         local($name,$enc)=@_;
  40
  41         &function_begin_B($name,"");
  42
  43         &comment("");
  44
  45         &push("ebp");
  46         &push("ebx");
  47         &mov($tmp2,&wparam(0));
  48         &mov($P,&wparam(1));
  49         &push("esi");
  50         &push("edi");
  51
  52         &comment("Load the 2 words");
  53         &mov($L,&DWP(0,$tmp2,"",0));
  54         &mov($R,&DWP(4,$tmp2,"",0));
  55
  56         &xor(   $tmp1,  $tmp1);
  57
  58         # encrypting part
  59
  60         if ($enc)
  61                 {
  62                  &mov($tmp2,&DWP(0,$P,"",0));
  63                 &xor(   $tmp3,  $tmp3);
  64
  65                 &xor($L,$tmp2);
  66                 for ($i=0; $i<$BF_ROUNDS; $i+=2)
  67                         {
  68                         &comment("");
  69                         &comment("Round $i");
  70                         &BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  71
  72                         &comment("");
  73                         &comment("Round ".sprintf("%d",$i+1));
  74                         &BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  75                         }
  76                 # &mov($tmp1,&wparam(0)); In last loop
  77                 &mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  78                 }
  79         else
  80                 {
  81                  &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  82                 &xor(   $tmp3,  $tmp3);
  83
  84                 &xor($L,$tmp2);
  85                 for ($i=$BF_ROUNDS; $i>0; $i-=2)
  86                         {
  87                         &comment("");
  88                         &comment("Round $i");
  89                         &BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  90                         &comment("");
  91                         &comment("Round ".sprintf("%d",$i-1));
  92                         &BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  93                         }
  94                 # &mov($tmp1,&wparam(0)); In last loop
  95                 &mov($tmp4,&DWP(0,$P,"",0));
  96                 }
  97
  98         &xor($R,$tmp4);
  99         &mov(&DWP(4,$tmp1,"",0),$L);
 100
 101         &mov(&DWP(0,$tmp1,"",0),$R);
 102         &function_end($name);
 103         }
 104
 105 sub BF_ENCRYPT
 106         {
 107         local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
 108
 109         &mov(   $tmp4,          &DWP(&n2a($i*4),$P,"",0)); # for next round
 110
 111         &mov(   $tmp2,          $R);
 112         &xor(   $L,             $tmp4);
 113
 114         &shr(   $tmp2,          16);
 115         &mov(   $tmp4,          $R);
 116
 117         &movb(  &LB($tmp1),     &HB($tmp2));    # A
 118         &and(   $tmp2,          0xff);          # B
 119
 120         &movb(  &LB($tmp3),     &HB($tmp4));    # C
 121         &and(   $tmp4,          0xff);          # D
 122
 123         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
 124         &mov(   $tmp2,          &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
 125
 126         &add(   $tmp2,          $tmp1);
 127         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
 128
 129         &xor(   $tmp2,          $tmp1);
 130         &mov(   $tmp4,          &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
 131
 132         &add(   $tmp2,          $tmp4);
 133         if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
 134                 { &xor( $tmp1,          $tmp1); }
 135         else
 136                 {
 137                 &comment("Load parameter 0 ($i) enc=$enc");
 138                 &mov($tmp1,&wparam(0));
 139                 } # In last loop
 140
 141         &xor(   $L,             $tmp2);
 142         # delay
 143         }
 144
 145 sub n2a
 146         {
 147         sprintf("%d",$_[0]);
 148         }
 149