crypto/des/asm/des586.pl

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