crypto/des/asm/crypt586.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 # The inner loop instruction sequence and the IP/FP modifications are from
  10 # Svend Olaf Mikkelsen
  11
  12 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  13 push(@INC,"${dir}","${dir}../../perlasm");
  14 require "x86asm.pl";
  15
  16 $output=pop and open STDOUT,">$output";
  17
  18 &asm_init($ARGV[0]);
  19
  20 $L="edi";
  21 $R="esi";
  22
  23 &external_label("DES_SPtrans");
  24 &fcrypt_body("fcrypt_body");
  25 &asm_finish();
  26
  27 close STDOUT or die "error closing STDOUT: $!";
  28
  29 sub fcrypt_body
  30         {
  31         local($name,$do_ip)=@_;
  32
  33         &function_begin($name);
  34
  35         &comment("");
  36         &comment("Load the 2 words");
  37         $trans="ebp";
  38
  39         &xor(   $L,     $L);
  40         &xor(   $R,     $R);
  41
  42         # PIC-ification:-)
  43         &picmeup("edx","DES_SPtrans");
  44         #if ($cpp)      { &picmeup("edx","DES_SPtrans");   }
  45         #else           { &lea("edx",&DWP("DES_SPtrans")); }
  46         &push("edx");   # becomes &swtmp(1)
  47         #
  48         &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
  49
  50         &push(&DWC(25)); # add a variable
  51
  52         &set_label("start");
  53         for ($i=0; $i<16; $i+=2)
  54                 {
  55                 &comment("");
  56                 &comment("Round $i");
  57                 &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
  58
  59                 &comment("");
  60                 &comment("Round ".sprintf("%d",$i+1));
  61                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
  62                 }
  63          &mov("ebx",    &swtmp(0));
  64         &mov("eax",     $L);
  65          &dec("ebx");
  66         &mov($L,        $R);
  67          &mov($R,       "eax");
  68         &mov(&swtmp(0), "ebx");
  69          &jnz(&label("start"));
  70
  71         &comment("");
  72         &comment("FP");
  73         &mov("edx",&wparam(0));
  74
  75         &FP_new($R,$L,"eax",3);
  76         &mov(&DWP(0,"edx","",0),"eax");
  77         &mov(&DWP(4,"edx","",0),$L);
  78
  79         &add("esp",8);  # remove variables
  80
  81         &function_end($name);
  82         }
  83
  84 sub D_ENCRYPT
  85         {
  86         local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
  87
  88         &mov(   $u,             &wparam(2));                    # 2
  89         &mov(   $t,             $R);
  90         &shr(   $t,             16);                            # 1
  91         &mov(   $tmp2,          &wparam(3));                    # 2
  92         &xor(   $t,             $R);                            # 1
  93
  94         &and(   $u,             $t);                            # 2
  95         &and(   $t,             $tmp2);                         # 2
  96
  97         &mov(   $tmp1,          $u);
  98         &shl(   $tmp1,          16);                            # 1
  99         &mov(   $tmp2,          $t);
 100         &shl(   $tmp2,          16);                            # 1
 101         &xor(   $u,             $tmp1);                         # 2
 102         &xor(   $t,             $tmp2);                         # 2
 103         &mov(   $tmp1,          &DWP(&n2a($S*4),$trans,"",0));  # 2
 104         &xor(   $u,             $tmp1);
 105         &mov(   $tmp2,          &DWP(&n2a(($S+1)*4),$trans,"",0));      # 2
 106         &xor(   $u,             $R);
 107         &xor(   $t,             $R);
 108         &xor(   $t,             $tmp2);
 109
 110         &and(   $u,             "0xfcfcfcfc"    );              # 2
 111         &xor(   $tmp1,          $tmp1);                         # 1
 112         &and(   $t,             "0xcfcfcfcf"    );              # 2
 113         &xor(   $tmp2,          $tmp2);
 114         &movb(  &LB($tmp1),     &LB($u) );
 115         &movb(  &LB($tmp2),     &HB($u) );
 116         &rotr(  $t,             4               );
 117         &mov(   $trans,         &swtmp(1));
 118         &xor(   $L,             &DWP("     ",$trans,$tmp1,0));
 119         &movb(  &LB($tmp1),     &LB($t) );
 120         &xor(   $L,             &DWP("0x200",$trans,$tmp2,0));
 121         &movb(  &LB($tmp2),     &HB($t) );
 122         &shr(   $u,             16);
 123         &xor(   $L,             &DWP("0x100",$trans,$tmp1,0));
 124         &movb(  &LB($tmp1),     &HB($u) );
 125         &shr(   $t,             16);
 126         &xor(   $L,             &DWP("0x300",$trans,$tmp2,0));
 127         &movb(  &LB($tmp2),     &HB($t) );
 128         &and(   $u,             "0xff"  );
 129         &and(   $t,             "0xff"  );
 130         &mov(   $tmp1,          &DWP("0x600",$trans,$tmp1,0));
 131         &xor(   $L,             $tmp1);
 132         &mov(   $tmp1,          &DWP("0x700",$trans,$tmp2,0));
 133         &xor(   $L,             $tmp1);
 134         &mov(   $tmp1,          &DWP("0x400",$trans,$u,0));
 135         &xor(   $L,             $tmp1);
 136         &mov(   $tmp1,          &DWP("0x500",$trans,$t,0));
 137         &xor(   $L,             $tmp1);
 138         &mov(   $trans,         &wparam(1));
 139         }
 140
 141 sub n2a
 142         {
 143         sprintf("%d",$_[0]);
 144         }
 145
 146 # now has a side affect of rotating $a by $shift
 147 sub R_PERM_OP
 148         {
 149         local($a,$b,$tt,$shift,$mask,$last)=@_;
 150
 151         &rotl(  $a,             $shift          ) if ($shift != 0);
 152         &mov(   $tt,            $a              );
 153         &xor(   $a,             $b              );
 154         &and(   $a,             $mask           );
 155         if ($notlast eq $b)
 156                 {
 157                 &xor(   $b,             $a              );
 158                 &xor(   $tt,            $a              );
 159                 }
 160         else
 161                 {
 162                 &xor(   $tt,            $a              );
 163                 &xor(   $b,             $a              );
 164                 }
 165         &comment("");
 166         }
 167
 168 sub IP_new
 169         {
 170         local($l,$r,$tt,$lr)=@_;
 171
 172         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
 173         &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
 174         &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
 175         &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
 176         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
 177
 178         if ($lr != 3)
 179                 {
 180                 if (($lr-3) < 0)
 181                         { &rotr($tt,    3-$lr); }
 182                 else    { &rotl($tt,    $lr-3); }
 183                 }
 184         if ($lr != 2)
 185                 {
 186                 if (($lr-2) < 0)
 187                         { &rotr($r,     2-$lr); }
 188                 else    { &rotl($r,     $lr-2); }
 189                 }
 190         }
 191
 192 sub FP_new
 193         {
 194         local($l,$r,$tt,$lr)=@_;
 195
 196         if ($lr != 2)
 197                 {
 198                 if (($lr-2) < 0)
 199                         { &rotl($r,     2-$lr); }
 200                 else    { &rotr($r,     $lr-2); }
 201                 }
 202         if ($lr != 3)
 203                 {
 204                 if (($lr-3) < 0)
 205                         { &rotl($l,     3-$lr); }
 206                 else    { &rotr($l,     $lr-3); }
 207                 }
 208
 209         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
 210         &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
 211         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
 212         &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
 213         &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
 214         &rotr($tt       , 4);
 215         }
 216