crypto/openssl-0.9.7d/crypto/bf/asm/bf-586.pl

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