crypto/des/asm/des686.pl

   1 #!/usr/local/bin/perl
   2 \r
   3 $prog="des686.pl";\r
   4 \r
   5 # base code is in microsft\r
   6 # op dest, source\r
   7 # format.\r
   8 #\r
   9 \r
  10 # WILL NOT WORK ANYMORE WITH desboth.pl\r
  11 require "desboth.pl";\r
  12 \r
  13 if (    ($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($L,&DWP(0,"eax","",0));\r
  67         &mov($R,&DWP(4,"eax","",0));\r
  68 \r
  69         $ksp=&wparam(1);\r
  70 \r
  71         if ($do_ip)\r
  72                 {\r
  73                 &comment("");\r
  74                 &comment("IP");\r
  75                 &IP($L,$R,"eax");\r
  76                 }\r
  77 \r
  78         &comment("");\r
  79         &comment("fixup rotate");\r
  80         &rotl($R,3);\r
  81         &rotl($L,3);\r
  82         &exch($L,$R);\r
  83 \r
  84         &comment("");\r
  85         &comment("load counter, key_schedule and enc flag");\r
  86         &mov("eax",&wparam(2)); # get encrypt flag\r
  87         &mov("ebp",&wparam(1)); # get ks\r
  88         &cmp("eax","0");\r
  89         &je(&label("start_decrypt"));\r
  90 \r
  91         # encrypting part\r
  92 \r
  93         for ($i=0; $i<16; $i+=2)\r
  94                 {\r
  95                 &comment("");\r
  96                 &comment("Round $i");\r
  97                 &D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");\r
  98 \r
  99                 &comment("");\r
 100                 &comment("Round ".sprintf("%d",$i+1));\r
 101                 &D_ENCRYPT($R,$L,($i+1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");\r
 102                 }\r
 103         &jmp(&label("end"));\r
 104 \r
 105         &set_label("start_decrypt");\r
 106 \r
 107         for ($i=15; $i>0; $i-=2)\r
 108                 {\r
 109                 &comment("");\r
 110                 &comment("Round $i");\r
 111                 &D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");\r
 112                 &comment("");\r
 113                 &comment("Round ".sprintf("%d",$i-1));\r
 114                 &D_ENCRYPT($R,$L,($i-1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");\r
 115                 }\r
 116 \r
 117         &set_label("end");\r
 118 \r
 119         &comment("");\r
 120         &comment("Fixup");\r
 121         &rotr($L,3);            # r\r
 122         &rotr($R,3);            # l\r
 123 \r
 124         if ($do_ip)\r
 125                 {\r
 126                 &comment("");\r
 127                 &comment("FP");\r
 128                 &FP($R,$L,"eax");\r
 129                 }\r
 130 \r
 131         &mov("eax",&wparam(0));\r
 132         &mov(&DWP(0,"eax","",0),$L);\r
 133         &mov(&DWP(4,"eax","",0),$R);\r
 134 \r
 135         &function_end($name);\r
 136         }\r
 137 \r
 138 \r
 139 # The logic is to load R into 2 registers and operate on both at the same time.\r
 140 # We also load the 2 R's into 2 more registers so we can do the 'move word down a byte'\r
 141 # while also masking the other copy and doing a lookup.  We then also accumulate the\r
 142 # L value in 2 registers then combine them at the end.\r
 143 sub D_ENCRYPT\r
 144         {\r
 145         local($L,$R,$S,$ks,$desSP,$u,$t,$tmp1,$tmp2,$tmp3)=@_;\r
 146 \r
 147         &mov(   $u,             &DWP(&n2a($S*4),$ks,"",0));\r
 148         &mov(   $t,             &DWP(&n2a(($S+1)*4),$ks,"",0));\r
 149         &xor(   $u,             $R              );\r
 150         &xor(   $t,             $R              );\r
 151         &rotr(  $t,             4               );\r
 152 \r
 153         # the numbers at the end of the line are origional instruction order\r
 154         &mov(   $tmp2,          $u              );                      # 1 2\r
 155         &mov(   $tmp1,          $t              );                      # 1 1\r
 156         &and(   $tmp2,          "0xfc"          );                      # 1 4\r
 157         &and(   $tmp1,          "0xfc"          );                      # 1 3\r
 158         &shr(   $t,             8               );                      # 1 5\r
 159         &xor(   $L,             &DWP("0x100+$desSP",$tmp1,"",0));       # 1 7\r
 160         &shr(   $u,             8               );                      # 1 6\r
 161         &mov(   $tmp1,          &DWP("      $desSP",$tmp2,"",0));       # 1 8\r
 162 \r
 163         &mov(   $tmp2,          $u              );                      # 2 2\r
 164         &xor(   $L,             $tmp1           );                      # 1 9\r
 165         &and(   $tmp2,          "0xfc"          );                      # 2 4\r
 166         &mov(   $tmp1,          $t              );                      # 2 1\r
 167         &and(   $tmp1,          "0xfc"          );                      # 2 3\r
 168         &shr(   $t,             8               );                      # 2 5\r
 169         &xor(   $L,             &DWP("0x300+$desSP",$tmp1,"",0));       # 2 7\r
 170         &shr(   $u,             8               );                      # 2 6\r
 171         &mov(   $tmp1,          &DWP("0x200+$desSP",$tmp2,"",0));       # 2 8\r
 172         &mov(   $tmp2,          $u              );                      # 3 2\r
 173 \r
 174         &xor(   $L,             $tmp1           );                      # 2 9\r
 175         &and(   $tmp2,          "0xfc"          );                      # 3 4\r
 176 \r
 177         &mov(   $tmp1,          $t              );                      # 3 1 \r
 178         &shr(   $u,             8               );                      # 3 6\r
 179         &and(   $tmp1,          "0xfc"          );                      # 3 3\r
 180         &shr(   $t,             8               );                      # 3 5\r
 181         &xor(   $L,             &DWP("0x500+$desSP",$tmp1,"",0));       # 3 7\r
 182         &mov(   $tmp1,          &DWP("0x400+$desSP",$tmp2,"",0));       # 3 8\r
 183 \r
 184         &and(   $t,             "0xfc"          );                      # 4 1\r
 185         &xor(   $L,             $tmp1           );                      # 3 9\r
 186 \r
 187         &and(   $u,             "0xfc"          );                      # 4 2\r
 188         &xor(   $L,             &DWP("0x700+$desSP",$t,"",0));          # 4 3\r
 189         &xor(   $L,             &DWP("0x600+$desSP",$u,"",0));          # 4 4\r
 190         }\r
 191 \r
 192 sub PERM_OP\r
 193         {\r
 194         local($a,$b,$tt,$shift,$mask)=@_;\r
 195 \r
 196         &mov(   $tt,            $a              );\r
 197         &shr(   $tt,            $shift          );\r
 198         &xor(   $tt,            $b              );\r
 199         &and(   $tt,            $mask           );\r
 200         &xor(   $b,             $tt             );\r
 201         &shl(   $tt,            $shift          );\r
 202         &xor(   $a,             $tt             );\r
 203         }\r
 204 \r
 205 sub IP\r
 206         {\r
 207         local($l,$r,$tt)=@_;\r
 208 \r
 209         &PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");\r
 210         &PERM_OP($l,$r,$tt,16,"0x0000ffff");\r
 211         &PERM_OP($r,$l,$tt, 2,"0x33333333");\r
 212         &PERM_OP($l,$r,$tt, 8,"0x00ff00ff");\r
 213         &PERM_OP($r,$l,$tt, 1,"0x55555555");\r
 214         }\r
 215 \r
 216 sub FP\r
 217         {\r
 218         local($l,$r,$tt)=@_;\r
 219 \r
 220         &PERM_OP($l,$r,$tt, 1,"0x55555555");\r
 221         &PERM_OP($r,$l,$tt, 8,"0x00ff00ff");\r
 222         &PERM_OP($l,$r,$tt, 2,"0x33333333");\r
 223         &PERM_OP($r,$l,$tt,16,"0x0000ffff");\r
 224         &PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");\r
 225         }\r
 226 \r
 227 sub n2a\r
 228         {\r
 229         sprintf("%d",$_[0]);\r
 230         }\r