crypto/des/asm/des586.pl

   1 #!/usr/local/bin/perl
   2
   3 $prog="des586.pl";
   4
   5 # base code is in microsft
   6 # op dest, source
   7 # format.
   8 #
   9
  10 # WILL NOT WORK ANYMORE WITH desboth.pl
  11 require "desboth.pl";
  12
  13 if (    ($ARGV[0] eq "elf"))
  14         { require "x86unix.pl"; }
  15 elsif ( ($ARGV[0] eq "a.out"))
  16         { $aout=1; require "x86unix.pl"; }
  17 elsif ( ($ARGV[0] eq "sol"))
  18         { $sol=1; require "x86unix.pl"; }
  19 elsif ( ($ARGV[0] eq "cpp"))
  20         { $cpp=1; require "x86unix.pl"; }
  21 elsif ( ($ARGV[0] eq "win32"))
  22         { require "x86ms.pl"; }
  23 else
  24         {
  25         print STDERR <<"EOF";
  26 Pick one target type from
  27         elf     - linux, FreeBSD etc
  28         a.out   - old linux
  29         sol     - x86 solaris
  30         cpp     - format so x86unix.cpp can be used
  31         win32   - Windows 95/Windows NT
  32 EOF
  33         exit(1);
  34         }
  35
  36 &comment("Don't even think of reading this code");
  37 &comment("It was automatically generated by $prog");
  38 &comment("Which is a perl program used to generate the x86 assember for");
  39 &comment("any of elf, a.out, Win32, or Solaris");
  40 &comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+");
  41 &comment("eric <eay\@cryptsoft.com>");
  42 &comment("");
  43
  44 &file("dx86xxxx");
  45
  46 $L="edi";
  47 $R="esi";
  48
  49 &des_encrypt("des_encrypt",1);
  50 &des_encrypt("des_encrypt2",0);
  51
  52 &des_encrypt3("des_encrypt3",1);
  53 &des_encrypt3("des_decrypt3",0);
  54
  55 &file_end();
  56
  57 sub des_encrypt
  58         {
  59         local($name,$do_ip)=@_;
  60
  61         &function_begin($name,3,"EXTRN   _des_SPtrans:DWORD");
  62
  63         &comment("");
  64         &comment("Load the 2 words");
  65         &mov("eax",&wparam(0));
  66         &mov($R,&DWP(0,"eax","",0));
  67         &mov($L,&DWP(4,"eax","",0));
  68
  69         if ($do_ip)
  70                 {
  71                 &comment("");
  72                 &comment("IP");
  73                 &IP($R,$L,"eax");
  74                 }
  75
  76         &comment("");
  77         &comment("fixup rotate");
  78         &rotl($R,3);
  79         &rotl($L,3);
  80
  81         &comment("");
  82         &comment("load counter, key_schedule and enc flag");
  83
  84         # encrypting part
  85
  86         $ks="ebp";
  87         &xor(   "ebx",          "ebx"           );
  88         &mov("eax",&wparam(2)); # get encrypt flag
  89         &xor(   "ecx",          "ecx"           );
  90         &cmp("eax","0");
  91         &mov(   $ks,            &wparam(1)      );
  92         &je(&label("start_decrypt"));
  93
  94         for ($i=0; $i<16; $i+=2)
  95                 {
  96                 &comment("");
  97                 &comment("Round $i");
  98                 &D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
  99
 100                 &comment("");
 101                 &comment("Round ".sprintf("%d",$i+1));
 102                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 103                 }
 104         &jmp(&label("end"));
 105
 106         &set_label("start_decrypt");
 107
 108         for ($i=15; $i>0; $i-=2)
 109                 {
 110                 &comment("");
 111                 &comment("Round $i");
 112                 &D_ENCRYPT(15-$i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 113                 &comment("");
 114                 &comment("Round ".sprintf("%d",$i-1));
 115                 &D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 116                 }
 117
 118         &set_label("end");
 119
 120         &comment("");
 121         &comment("Fixup");
 122         &rotr($L,3);            # r
 123         &rotr($R,3);            # l
 124
 125         if ($do_ip)
 126                 {
 127                 &comment("");
 128                 &comment("FP");
 129                 &FP($R,$L,"eax");
 130                 }
 131
 132         &mov("eax",&wparam(0));
 133         &mov(&DWP(0,"eax","",0),$L);
 134         &mov(&DWP(4,"eax","",0),$R);
 135
 136         &function_end($name);
 137         }
 138
 139 sub D_ENCRYPT
 140         {
 141         local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
 142
 143          &mov(  $t,             &DWP(&n2a(($S+1)*4),$ks,"",0));
 144         &mov(   $u,             &DWP(&n2a($S*4),$ks,"",0));
 145          &xor(  $t,             $R);
 146         &xor(   $u,             $R);
 147          &rotr( $t,             4               );
 148         &and(   $u,             "0xfcfcfcfc"    );
 149          &and(  $t,             "0xfcfcfcfc"    );
 150         &movb(  &LB($tmp1),     &LB($u) );
 151         &movb(  &LB($tmp2),     &HB($u) );
 152         &xor(   $L,             &DWP("      $desSP",$tmp1,"",0));
 153         &shr(   $u,             16);
 154         &xor(   $L,             &DWP("0x200+$desSP",$tmp2,"",0));
 155         &movb(  &LB($tmp1),     &LB($u) );
 156         &movb(  &LB($tmp2),     &HB($u) );
 157         &xor(   $L,             &DWP("0x400+$desSP",$tmp1,"",0));
 158         &mov(   $u,             &DWP("0x600+$desSP",$tmp2,"",0));
 159
 160          &movb( &LB($tmp1),     &LB($t) );
 161          &movb( &LB($tmp2),     &HB($t) );
 162          &xor(  $L,             &DWP("0x100+$desSP",$tmp1,"",0));
 163          &shr(  $t,             16);
 164          &xor(  $u,             &DWP("0x300+$desSP",$tmp2,"",0));
 165          &movb( &LB($tmp1),     &LB($t) );
 166          &movb( &LB($tmp2),     &HB($t) );
 167          &xor(  $L,             &DWP("0x500+$desSP",$tmp1,"",0));
 168          &xor(  $u,             &DWP("0x700+$desSP",$tmp2,"",0));
 169          &xor(  $L,     $u);
 170         }
 171
 172 sub PERM_OP
 173         {
 174         local($a,$b,$tt,$shift,$mask)=@_;
 175
 176         &mov(   $tt,            $a              );
 177         &shr(   $tt,            $shift          );
 178         &xor(   $tt,            $b              );
 179         &and(   $tt,            $mask           );
 180         &xor(   $b,             $tt             );
 181         &shl(   $tt,            $shift          );
 182         &xor(   $a,             $tt             );
 183         }
 184
 185 sub IP
 186         {
 187         local($l,$r,$tt)=@_;
 188
 189         &PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");
 190         &PERM_OP($l,$r,$tt,16,"0x0000ffff");
 191         &PERM_OP($r,$l,$tt, 2,"0x33333333");
 192         &PERM_OP($l,$r,$tt, 8,"0x00ff00ff");
 193         &PERM_OP($r,$l,$tt, 1,"0x55555555");
 194         }
 195
 196 sub FP
 197         {
 198         local($l,$r,$tt)=@_;
 199
 200         &PERM_OP($l,$r,$tt, 1,"0x55555555");
 201         &PERM_OP($r,$l,$tt, 8,"0x00ff00ff");
 202         &PERM_OP($l,$r,$tt, 2,"0x33333333");
 203         &PERM_OP($r,$l,$tt,16,"0x0000ffff");
 204         &PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");
 205         }
 206
 207 sub n2a
 208         {
 209         sprintf("%d",$_[0]);
 210         }