crypto/des/asm/des-som2.pl

   1 #!/usr/local/bin/perl
   2 #
   3 # The inner loop instruction sequence and the IP/FP modifications are from
   4 # Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk>
   5 #
   6
   7 $prog="des-som2.pl";
   8
   9 # base code is in microsft
  10 # op dest, source
  11 # format.
  12 #
  13
  14 require "desboth.pl";
  15
  16 if (    ($ARGV[0] eq "elf"))
  17         { require "x86unix.pl"; }
  18 elsif ( ($ARGV[0] eq "a.out"))
  19         { $aout=1; require "x86unix.pl"; }
  20 elsif ( ($ARGV[0] eq "sol"))
  21         { $sol=1; require "x86unix.pl"; }
  22 elsif ( ($ARGV[0] eq "cpp"))
  23         { $cpp=1; require "x86unix.pl"; }
  24 elsif ( ($ARGV[0] eq "win32"))
  25         { require "x86ms.pl"; }
  26 else
  27         {
  28         print STDERR <<"EOF";
  29 Pick one target type from
  30         elf     - linux, FreeBSD etc
  31         a.out   - old linux
  32         sol     - x86 solaris
  33         cpp     - format so x86unix.cpp can be used
  34         win32   - Windows 95/Windows NT
  35 EOF
  36         exit(1);
  37         }
  38
  39 &comment("Don't even think of reading this code");
  40 &comment("It was automatically generated by $prog");
  41 &comment("Which is a perl program used to generate the x86 assember for");
  42 &comment("any of elf, a.out, Win32, or Solaris");
  43 &comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+");
  44 &comment("eric <eay\@cryptsoft.com>");
  45 &comment("The inner loop instruction sequence and the IP/FP modifications");
  46 &comment("are from Svend Olaf Mikkelsen <svolaf\@inet.uni-c.dk>");
  47
  48 &comment("");
  49
  50 &file("dx86xxxx");
  51
  52 $L="edi";
  53 $R="esi";
  54
  55 &des_encrypt("des_encrypt",1);
  56 &des_encrypt("des_encrypt2",0);
  57
  58 &des_encrypt3("des_encrypt3",1);
  59 &des_encrypt3("des_decrypt3",0);
  60
  61 &file_end();
  62
  63 sub des_encrypt
  64         {
  65         local($name,$do_ip)=@_;
  66
  67         &function_begin($name,3,"EXTRN   _des_SPtrans:DWORD");
  68
  69         &comment("");
  70         &comment("Load the 2 words");
  71         &mov("eax",&wparam(0));
  72         &mov($R,&DWP(0,"eax","",0));
  73         &mov($L,&DWP(4,"eax","",0));
  74
  75         if ($do_ip)
  76                 {
  77                 &comment("");
  78                 &comment("IP");
  79                 &IP_new($R,$L,"eax",3);
  80 #               &comment("");
  81 #               &comment("fixup rotate");
  82 #               &rotl($R,3);
  83 #               &rotl($L,3);
  84                 }
  85         else
  86                 {
  87                 &comment("");
  88                 &comment("fixup rotate");
  89                 &rotl($R,3);
  90                 &rotl($L,3);
  91                 }
  92
  93         &comment("");
  94         &comment("load counter, key_schedule and enc flag");
  95
  96         # encrypting part
  97
  98         $ks="ebp";
  99 #       &xor(   "ebx",          "ebx"           );
 100         &mov("eax",&wparam(2)); # get encrypt flag
 101         &xor(   "ecx",          "ecx"           );
 102         &cmp("eax","0");
 103         &mov(   $ks,            &wparam(1)      );
 104         &je(&label("start_decrypt"));
 105
 106         for ($i=0; $i<16; $i+=2)
 107                 {
 108                 &comment("");
 109                 &comment("Round $i");
 110                 &D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 111
 112                 &comment("");
 113                 &comment("Round ".sprintf("%d",$i+1));
 114                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 115                 }
 116         &jmp(&label("end"));
 117
 118         &set_label("start_decrypt");
 119
 120         for ($i=15; $i>0; $i-=2)
 121                 {
 122                 &comment("");
 123                 &comment("Round $i");
 124                 &D_ENCRYPT(15-$i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 125                 &comment("");
 126                 &comment("Round ".sprintf("%d",$i-1));
 127                 &D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
 128                 }
 129
 130         &set_label("end");
 131
 132         if ($do_ip)
 133                 {
 134 #               &comment("");
 135 #               &comment("Fixup");
 136 #               &rotr($L,3);            # r
 137 #               &rotr($R,3);            # l
 138                 &comment("");
 139                 &comment("FP");
 140                 &FP_new($R,$L,"eax",3);
 141                 }
 142         else
 143                 {
 144                 &comment("");
 145                 &comment("Fixup");
 146                 &rotr($L,3);            # r
 147                 &rotr($R,3);            # l
 148                 }
 149
 150         &mov("eax",&wparam(0));
 151         &mov(&DWP(0,"eax","",0),$L);
 152         &mov(&DWP(4,"eax","",0),$R);
 153
 154         &function_end($name);
 155         }
 156
 157 sub D_ENCRYPT
 158         {
 159         local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
 160
 161         &mov(   $u,             &DWP(&n2a($S*4),$ks,"",0));
 162         &xor(   $tmp1,          $tmp1);
 163         &mov(   $t,             &DWP(&n2a(($S+1)*4),$ks,"",0));
 164         &xor(   $u,             $R);
 165         &xor(   $t,             $R);
 166         &and(   $u,             "0xfcfcfcfc"    );
 167         &and(   $t,             "0xcfcfcfcf"    );
 168         &movb(  &LB($tmp1),     &LB($u) );
 169         &movb(  &LB($tmp2),     &HB($u) );
 170         &rotr(  $t,             4               );
 171         &mov(   $ks,            &DWP("      $desSP",$tmp1,"",0));
 172         &movb(  &LB($tmp1),     &LB($t) );
 173         &xor(   $L,             $ks);
 174         &mov(   $ks,            &DWP("0x200+$desSP",$tmp2,"",0));
 175         &xor(   $L,             $ks); ######
 176         &movb(  &LB($tmp2),     &HB($t) );
 177         &shr(   $u,             16);
 178         &mov(   $ks,            &DWP("0x100+$desSP",$tmp1,"",0));
 179         &xor(   $L,             $ks); ######
 180         &movb(  &LB($tmp1),     &HB($u) );
 181         &shr(   $t,             16);
 182         &mov(   $ks,            &DWP("0x300+$desSP",$tmp2,"",0));
 183         &xor(   $L,             $ks);
 184         &mov(   $ks,            &DWP(24,"esp","",0)); ####
 185         &movb(  &LB($tmp2),     &HB($t) );
 186         &and(   $u,             "0xff"  );
 187         &and(   $t,             "0xff"  );
 188         &mov(   $tmp1,          &DWP("0x600+$desSP",$tmp1,"",0));
 189         &xor(   $L,             $tmp1);
 190         &mov(   $tmp1,          &DWP("0x700+$desSP",$tmp2,"",0));
 191         &xor(   $L,             $tmp1);
 192         &mov(   $tmp1,          &DWP("0x400+$desSP",$u,"",0));
 193         &xor(   $L,             $tmp1);
 194         &mov(   $tmp1,          &DWP("0x500+$desSP",$t,"",0));
 195         &xor(   $L,             $tmp1);
 196         }
 197
 198 sub PERM_OP
 199         {
 200         local($a,$b,$tt,$shift,$mask)=@_;
 201
 202         &mov(   $tt,            $a              );
 203         &shr(   $tt,            $shift          );
 204         &xor(   $tt,            $b              );
 205         &and(   $tt,            $mask           );
 206         &xor(   $b,             $tt             );
 207         &shl(   $tt,            $shift          );
 208         &xor(   $a,             $tt             );
 209         }
 210
 211 sub IP
 212         {
 213         local($l,$r,$tt)=@_;
 214
 215         &PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");
 216         &PERM_OP($l,$r,$tt,16,"0x0000ffff");
 217         &PERM_OP($r,$l,$tt, 2,"0x33333333");
 218         &PERM_OP($l,$r,$tt, 8,"0x00ff00ff");
 219         &PERM_OP($r,$l,$tt, 1,"0x55555555");
 220         }
 221
 222 sub FP
 223         {
 224         local($l,$r,$tt)=@_;
 225
 226         &PERM_OP($l,$r,$tt, 1,"0x55555555");
 227         &PERM_OP($r,$l,$tt, 8,"0x00ff00ff");
 228         &PERM_OP($l,$r,$tt, 2,"0x33333333");
 229         &PERM_OP($r,$l,$tt,16,"0x0000ffff");
 230         &PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");
 231         }
 232
 233 sub n2a
 234         {
 235         sprintf("%d",$_[0]);
 236         }
 237
 238 # now has a side affect of rotating $a by $shift
 239 sub R_PERM_OP
 240         {
 241         local($a,$b,$tt,$shift,$mask,$last)=@_;
 242
 243         &rotl(  $a,             $shift          ) if ($shift != 0);
 244         &mov(   $tt,            $b              );
 245         &xor(   $tt,            $a              );
 246         &and(   $tt,            $mask           );
 247         if ($last eq $b)
 248                 {
 249                 &xor(   $a,             $tt             );
 250                 &xor(   $b,             $tt             );
 251                 }
 252         else
 253                 {
 254                 &xor(   $b,             $tt             );
 255                 &xor(   $a,             $tt             );
 256                 }
 257         &comment("");
 258         }
 259
 260 sub IP_new
 261         {
 262         local($l,$r,$tt,$lr)=@_;
 263
 264         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
 265         &R_PERM_OP($r,$l,$tt,20,"0xfff0000f",$l);
 266         &R_PERM_OP($r,$l,$tt,14,"0x33333333",$r);
 267         &R_PERM_OP($l,$r,$tt,22,"0x03fc03fc",$r);
 268         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
 269
 270         if ($lr != 3)
 271                 {
 272                 if (($lr-3) < 0)
 273                         { &rotr($l,     3-$lr); }
 274                 else    { &rotl($l,     $lr-3); }
 275                 }
 276         if ($lr != 2)
 277                 {
 278                 if (($lr-2) < 0)
 279                         { &rotr($r,     2-$lr); }
 280                 else    { &rotl($r,     $lr-2); }
 281                 }
 282         }
 283
 284 sub FP_new
 285         {
 286         local($r,$l,$tt,$lr)=@_;
 287
 288         if ($lr != 2)
 289                 {
 290                 if (($lr-2) < 0)
 291                         { &rotl($r,     2-$lr); }
 292                 else    { &rotr($r,     $lr-2); }
 293                 }
 294         if ($lr != 3)
 295                 {
 296                 if (($lr-3) < 0)
 297                         { &rotl($l,     3-$lr); }
 298                 else    { &rotr($l,     $lr-3); }
 299                 }
 300
 301         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
 302         &R_PERM_OP($l,$r,$tt,23,"0x03fc03fc",$r);
 303         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
 304         &R_PERM_OP($r,$l,$tt,18,"0xfff0000f",$l);
 305         &R_PERM_OP($r,$l,$tt,12,"0xf0f0f0f0",$r);
 306         &rotr($l        , 4);
 307         }
 308