crypto/bf/asm/bf-586.pl

   1 #!/usr/local/bin/perl
   2
   3 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
   4 push(@INC,"${dir}","${dir}../../perlasm");
   5 require "x86asm.pl";
   6 require "cbc.pl";
   7
   8 $output = pop;
   9 open STDOUT,">$output";
  10
  11 &asm_init($ARGV[0],"bf-586.pl",$ARGV[$#ARGV] eq "386");
  12
  13 $BF_ROUNDS=16;
  14 $BF_OFF=($BF_ROUNDS+2)*4;
  15 $L="edi";
  16 $R="esi";
  17 $P="ebp";
  18 $tmp1="eax";
  19 $tmp2="ebx";
  20 $tmp3="ecx";
  21 $tmp4="edx";
  22
  23 &BF_encrypt("BF_encrypt",1);
  24 &BF_encrypt("BF_decrypt",0);
  25 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
  26 &asm_finish();
  27
  28 close STDOUT;
  29
  30 sub BF_encrypt
  31         {
  32         local($name,$enc)=@_;
  33
  34         &function_begin_B($name,"");
  35
  36         &comment("");
  37
  38         &push("ebp");
  39         &push("ebx");
  40         &mov($tmp2,&wparam(0));
  41         &mov($P,&wparam(1));
  42         &push("esi");
  43         &push("edi");
  44
  45         &comment("Load the 2 words");
  46         &mov($L,&DWP(0,$tmp2,"",0));
  47         &mov($R,&DWP(4,$tmp2,"",0));
  48
  49         &xor(   $tmp1,  $tmp1);
  50
  51         # encrypting part
  52
  53         if ($enc)
  54                 {
  55                  &mov($tmp2,&DWP(0,$P,"",0));
  56                 &xor(   $tmp3,  $tmp3);
  57
  58                 &xor($L,$tmp2);
  59                 for ($i=0; $i<$BF_ROUNDS; $i+=2)
  60                         {
  61                         &comment("");
  62                         &comment("Round $i");
  63                         &BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  64
  65                         &comment("");
  66                         &comment("Round ".sprintf("%d",$i+1));
  67                         &BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
  68                         }
  69                 # &mov($tmp1,&wparam(0)); In last loop
  70                 &mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  71                 }
  72         else
  73                 {
  74                  &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  75                 &xor(   $tmp3,  $tmp3);
  76
  77                 &xor($L,$tmp2);
  78                 for ($i=$BF_ROUNDS; $i>0; $i-=2)
  79                         {
  80                         &comment("");
  81                         &comment("Round $i");
  82                         &BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  83                         &comment("");
  84                         &comment("Round ".sprintf("%d",$i-1));
  85                         &BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
  86                         }
  87                 # &mov($tmp1,&wparam(0)); In last loop
  88                 &mov($tmp4,&DWP(0,$P,"",0));
  89                 }
  90
  91         &xor($R,$tmp4);
  92         &mov(&DWP(4,$tmp1,"",0),$L);
  93
  94         &mov(&DWP(0,$tmp1,"",0),$R);
  95         &function_end($name);
  96         }
  97
  98 sub BF_ENCRYPT
  99         {
 100         local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
 101
 102         &mov(   $tmp4,          &DWP(&n2a($i*4),$P,"",0)); # for next round
 103
 104         &mov(   $tmp2,          $R);
 105         &xor(   $L,             $tmp4);
 106
 107         &shr(   $tmp2,          16);
 108         &mov(   $tmp4,          $R);
 109
 110         &movb(  &LB($tmp1),     &HB($tmp2));    # A
 111         &and(   $tmp2,          0xff);          # B
 112
 113         &movb(  &LB($tmp3),     &HB($tmp4));    # C
 114         &and(   $tmp4,          0xff);          # D
 115
 116         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
 117         &mov(   $tmp2,          &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
 118
 119         &add(   $tmp2,          $tmp1);
 120         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
 121
 122         &xor(   $tmp2,          $tmp1);
 123         &mov(   $tmp4,          &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
 124
 125         &add(   $tmp2,          $tmp4);
 126         if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
 127                 { &xor( $tmp1,          $tmp1); }
 128         else
 129                 {
 130                 &comment("Load parameter 0 ($i) enc=$enc");
 131                 &mov($tmp1,&wparam(0));
 132                 } # In last loop
 133
 134         &xor(   $L,             $tmp2);
 135         # delay
 136         }
 137
 138 sub n2a
 139         {
 140         sprintf("%d",$_[0]);
 141         }
 142