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 Apache License 2.0 (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 $output = pop and open STDOUT,">$output";
  16
  17 &asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
  18
  19 $BF_ROUNDS=16;
  20 $BF_OFF=($BF_ROUNDS+2)*4;
  21 $L="edi";
  22 $R="esi";
  23 $P="ebp";
  24 $tmp1="eax";
  25 $tmp2="ebx";
  26 $tmp3="ecx";
  27 $tmp4="edx";
  28
  29 &BF_encrypt("BF_encrypt",1);
  30 &BF_encrypt("BF_decrypt",0);
  31 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
  32 &asm_finish();
  33
  34 close STDOUT or die "error closing STDOUT";
  35
  36 sub BF_encrypt
  37         {
  38         local($name,$enc)=@_;
  39
  40         &function_begin_B($name,"");
  41
  42         &comment("");
  43
  44         &push("ebp");
  45         &push("ebx");
  46         &mov($tmp2,&wparam(0));
  47         &mov($P,&wparam(1));
  48         &push("esi");
  49         &push("edi");
  50
  51         &comment("Load the 2 words");
  52         &mov($L,&DWP(0,$tmp2,"",0));
  53         &mov($R,&DWP(4,$tmp2,"",0));
  54
  55         &xor(   $tmp1,  $tmp1);
  56
  57         # encrypting part
  58
  59         if ($enc)
  60                 {
  61                  &mov($tmp2,&DWP(0,$P,"",0));
  62                 &xor(   $tmp3,  $tmp3);
  63
  64                 &xor($L,$tmp2);
  65                 for ($i=0; $i<$BF_ROUNDS; $i+=2)
  66                         {
  67                         &comment("");
  68                         &comment("Round $i");
  69                         &BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  70
  71                         &comment("");
  72                         &comment("Round ".sprintf("%d",$i+1));
  73                         &BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  74                         }
  75                 # &mov($tmp1,&wparam(0)); In last loop
  76                 &mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  77                 }
  78         else
  79                 {
  80                  &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  81                 &xor(   $tmp3,  $tmp3);
  82
  83                 &xor($L,$tmp2);
  84                 for ($i=$BF_ROUNDS; $i>0; $i-=2)
  85                         {
  86                         &comment("");
  87                         &comment("Round $i");
  88                         &BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  89                         &comment("");
  90                         &comment("Round ".sprintf("%d",$i-1));
  91                         &BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  92                         }
  93                 # &mov($tmp1,&wparam(0)); In last loop
  94                 &mov($tmp4,&DWP(0,$P,"",0));
  95                 }
  96
  97         &xor($R,$tmp4);
  98         &mov(&DWP(4,$tmp1,"",0),$L);
  99
 100         &mov(&DWP(0,$tmp1,"",0),$R);
 101         &function_end($name);
 102         }
 103
 104 sub BF_ENCRYPT
 105         {
 106         local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
 107
 108         &mov(   $tmp4,          &DWP(&n2a($i*4),$P,"",0)); # for next round
 109
 110         &mov(   $tmp2,          $R);
 111         &xor(   $L,             $tmp4);
 112
 113         &shr(   $tmp2,          16);
 114         &mov(   $tmp4,          $R);
 115
 116         &movb(  &LB($tmp1),     &HB($tmp2));    # A
 117         &and(   $tmp2,          0xff);          # B
 118
 119         &movb(  &LB($tmp3),     &HB($tmp4));    # C
 120         &and(   $tmp4,          0xff);          # D
 121
 122         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
 123         &mov(   $tmp2,          &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
 124
 125         &add(   $tmp2,          $tmp1);
 126         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
 127
 128         &xor(   $tmp2,          $tmp1);
 129         &mov(   $tmp4,          &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
 130
 131         &add(   $tmp2,          $tmp4);
 132         if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
 133                 { &xor( $tmp1,          $tmp1); }
 134         else
 135                 {
 136                 &comment("Load parameter 0 ($i) enc=$enc");
 137                 &mov($tmp1,&wparam(0));
 138                 } # In last loop
 139
 140         &xor(   $L,             $tmp2);
 141         # delay
 142         }
 143
 144 sub n2a
 145         {
 146         sprintf("%d",$_[0]);
 147         }
 148