crypto/openssl-0.9/crypto/bf/asm/bf-686.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-686.pl");
   8
   9 $BF_ROUNDS=16;
  10 $BF_OFF=($BF_ROUNDS+2)*4;
  11 $L="ecx";
  12 $R="edx";
  13 $P="edi";
  14 $tot="esi";
  15 $tmp1="eax";
  16 $tmp2="ebx";
  17 $tmp3="ebp";
  18
  19 &des_encrypt("BF_encrypt",1);
  20 &des_encrypt("BF_decrypt",0);
  21 &cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
  22
  23 &asm_finish();
  24
  25 &file_end();
  26
  27 sub des_encrypt
  28         {
  29         local($name,$enc)=@_;
  30
  31         &function_begin($name,"");
  32
  33         &comment("");
  34         &comment("Load the 2 words");
  35         &mov("eax",&wparam(0));
  36         &mov($L,&DWP(0,"eax","",0));
  37         &mov($R,&DWP(4,"eax","",0));
  38
  39         &comment("");
  40         &comment("P pointer, s and enc flag");
  41         &mov($P,&wparam(1));
  42
  43         &xor(   $tmp1,  $tmp1);
  44         &xor(   $tmp2,  $tmp2);
  45
  46         # encrypting part
  47
  48         if ($enc)
  49                 {
  50                 &xor($L,&DWP(0,$P,"",0));
  51                 for ($i=0; $i<$BF_ROUNDS; $i+=2)
  52                         {
  53                         &comment("");
  54                         &comment("Round $i");
  55                         &BF_ENCRYPT($i+1,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3);
  56
  57                         &comment("");
  58                         &comment("Round ".sprintf("%d",$i+1));
  59                         &BF_ENCRYPT($i+2,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
  60                         }
  61                 &xor($R,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  62
  63                 &mov("eax",&wparam(0));
  64                 &mov(&DWP(0,"eax","",0),$R);
  65                 &mov(&DWP(4,"eax","",0),$L);
  66                 &function_end_A($name);
  67                 }
  68         else
  69                 {
  70                 &xor($L,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
  71                 for ($i=$BF_ROUNDS; $i>0; $i-=2)
  72                         {
  73                         &comment("");
  74                         &comment("Round $i");
  75                         &BF_ENCRYPT($i,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3);
  76                         &comment("");
  77                         &comment("Round ".sprintf("%d",$i-1));
  78                         &BF_ENCRYPT($i-1,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
  79                         }
  80                 &xor($R,&DWP(0,$P,"",0));
  81
  82                 &mov("eax",&wparam(0));
  83                 &mov(&DWP(0,"eax","",0),$R);
  84                 &mov(&DWP(4,"eax","",0),$L);
  85                 &function_end_A($name);
  86                 }
  87
  88         &function_end_B($name);
  89         }
  90
  91 sub BF_ENCRYPT
  92         {
  93         local($i,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3)=@_;
  94
  95         &rotr(  $R,             16);
  96         &mov(   $tot,           &DWP(&n2a($i*4),$P,"",0));
  97
  98         &movb(  &LB($tmp1),     &HB($R));
  99         &movb(  &LB($tmp2),     &LB($R));
 100
 101         &rotr(  $R,             16);
 102         &xor(   $L,             $tot);
 103
 104         &mov(   $tot,           &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
 105         &mov(   $tmp3,          &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
 106
 107         &movb(  &LB($tmp1),     &HB($R));
 108         &movb(  &LB($tmp2),     &LB($R));
 109
 110         &add(   $tot,           $tmp3);
 111         &mov(   $tmp1,          &DWP(&n2a($BF_OFF+0x0800),$P,$tmp1,4)); # delay
 112
 113         &xor(   $tot,           $tmp1);
 114         &mov(   $tmp3,          &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp2,4));
 115
 116         &add(   $tot,           $tmp3);
 117         &xor(   $tmp1,          $tmp1);
 118
 119         &xor(   $L,             $tot);
 120         # delay
 121         }
 122
 123 sub n2a
 124         {
 125         sprintf("%d",$_[0]);
 126         }
 127