crypto/des/asm/crypt586.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 # I've added the stuff needed for crypt() but I've not worried about making
   6 # things perfect.
   7 #
   8
   9 push(@INC,"perlasm","../../perlasm");
  10 require "x86asm.pl";
  11
  12 &asm_init($ARGV[0],"crypt586.pl");
  13
  14 $L="edi";
  15 $R="esi";
  16
  17 &external_label("DES_SPtrans");
  18 &fcrypt_body("fcrypt_body");
  19 &asm_finish();
  20
  21 sub fcrypt_body
  22         {
  23         local($name,$do_ip)=@_;
  24
  25         &function_begin($name,"EXTRN   _DES_SPtrans:DWORD");
  26
  27         &comment("");
  28         &comment("Load the 2 words");
  29         $trans="ebp";
  30
  31         &xor(   $L,     $L);
  32         &xor(   $R,     $R);
  33
  34         # PIC-ification:-)
  35         if ($cpp)       { &picmeup("edx","DES_SPtrans");   }
  36         else            { &lea("edx",&DWP("DES_SPtrans")); }
  37         &push("edx");   # becomes &swtmp(1)
  38         #
  39         &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
  40
  41         &push(&DWC(25)); # add a variable
  42
  43         &set_label("start");
  44         for ($i=0; $i<16; $i+=2)
  45                 {
  46                 &comment("");
  47                 &comment("Round $i");
  48                 &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
  49
  50                 &comment("");
  51                 &comment("Round ".sprintf("%d",$i+1));
  52                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
  53                 }
  54          &mov("ebx",    &swtmp(0));
  55         &mov("eax",     $L);
  56          &dec("ebx");
  57         &mov($L,        $R);
  58          &mov($R,       "eax");
  59         &mov(&swtmp(0), "ebx");
  60          &jnz(&label("start"));
  61
  62         &comment("");
  63         &comment("FP");
  64         &mov("edx",&wparam(0));
  65
  66         &FP_new($R,$L,"eax",3);
  67         &mov(&DWP(0,"edx","",0),"eax");
  68         &mov(&DWP(4,"edx","",0),$L);
  69
  70         &add("esp",8);  # remove variables
  71
  72         &function_end($name);
  73         }
  74
  75 sub D_ENCRYPT
  76         {
  77         local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
  78
  79         &mov(   $u,             &wparam(2));                    # 2
  80         &mov(   $t,             $R);
  81         &shr(   $t,             16);                            # 1
  82         &mov(   $tmp2,          &wparam(3));                    # 2
  83         &xor(   $t,             $R);                            # 1
  84
  85         &and(   $u,             $t);                            # 2
  86         &and(   $t,             $tmp2);                         # 2
  87
  88         &mov(   $tmp1,          $u);
  89         &shl(   $tmp1,          16);                            # 1
  90         &mov(   $tmp2,          $t);
  91         &shl(   $tmp2,          16);                            # 1
  92         &xor(   $u,             $tmp1);                         # 2
  93         &xor(   $t,             $tmp2);                         # 2
  94         &mov(   $tmp1,          &DWP(&n2a($S*4),$trans,"",0));  # 2
  95         &xor(   $u,             $tmp1);
  96         &mov(   $tmp2,          &DWP(&n2a(($S+1)*4),$trans,"",0));      # 2
  97         &xor(   $u,             $R);
  98         &xor(   $t,             $R);
  99         &xor(   $t,             $tmp2);
 100
 101         &and(   $u,             "0xfcfcfcfc"    );              # 2
 102         &xor(   $tmp1,          $tmp1);                         # 1
 103         &and(   $t,             "0xcfcfcfcf"    );              # 2
 104         &xor(   $tmp2,          $tmp2);
 105         &movb(  &LB($tmp1),     &LB($u) );
 106         &movb(  &LB($tmp2),     &HB($u) );
 107         &rotr(  $t,             4               );
 108         &mov(   $trans,         &swtmp(1));
 109         &xor(   $L,             &DWP("     ",$trans,$tmp1,0));
 110         &movb(  &LB($tmp1),     &LB($t) );
 111         &xor(   $L,             &DWP("0x200",$trans,$tmp2,0));
 112         &movb(  &LB($tmp2),     &HB($t) );
 113         &shr(   $u,             16);
 114         &xor(   $L,             &DWP("0x100",$trans,$tmp1,0));
 115         &movb(  &LB($tmp1),     &HB($u) );
 116         &shr(   $t,             16);
 117         &xor(   $L,             &DWP("0x300",$trans,$tmp2,0));
 118         &movb(  &LB($tmp2),     &HB($t) );
 119         &and(   $u,             "0xff"  );
 120         &and(   $t,             "0xff"  );
 121         &mov(   $tmp1,          &DWP("0x600",$trans,$tmp1,0));
 122         &xor(   $L,             $tmp1);
 123         &mov(   $tmp1,          &DWP("0x700",$trans,$tmp2,0));
 124         &xor(   $L,             $tmp1);
 125         &mov(   $tmp1,          &DWP("0x400",$trans,$u,0));
 126         &xor(   $L,             $tmp1);
 127         &mov(   $tmp1,          &DWP("0x500",$trans,$t,0));
 128         &xor(   $L,             $tmp1);
 129         &mov(   $trans,         &wparam(1));
 130         }
 131
 132 sub n2a
 133         {
 134         sprintf("%d",$_[0]);
 135         }
 136
 137 # now has a side affect of rotating $a by $shift
 138 sub R_PERM_OP
 139         {
 140         local($a,$b,$tt,$shift,$mask,$last)=@_;
 141
 142         &rotl(  $a,             $shift          ) if ($shift != 0);
 143         &mov(   $tt,            $a              );
 144         &xor(   $a,             $b              );
 145         &and(   $a,             $mask           );
 146         if ($notlast eq $b)
 147                 {
 148                 &xor(   $b,             $a              );
 149                 &xor(   $tt,            $a              );
 150                 }
 151         else
 152                 {
 153                 &xor(   $tt,            $a              );
 154                 &xor(   $b,             $a              );
 155                 }
 156         &comment("");
 157         }
 158
 159 sub IP_new
 160         {
 161         local($l,$r,$tt,$lr)=@_;
 162
 163         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
 164         &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
 165         &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
 166         &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
 167         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
 168
 169         if ($lr != 3)
 170                 {
 171                 if (($lr-3) < 0)
 172                         { &rotr($tt,    3-$lr); }
 173                 else    { &rotl($tt,    $lr-3); }
 174                 }
 175         if ($lr != 2)
 176                 {
 177                 if (($lr-2) < 0)
 178                         { &rotr($r,     2-$lr); }
 179                 else    { &rotl($r,     $lr-2); }
 180                 }
 181         }
 182
 183 sub FP_new
 184         {
 185         local($l,$r,$tt,$lr)=@_;
 186
 187         if ($lr != 2)
 188                 {
 189                 if (($lr-2) < 0)
 190                         { &rotl($r,     2-$lr); }
 191                 else    { &rotr($r,     $lr-2); }
 192                 }
 193         if ($lr != 3)
 194                 {
 195                 if (($lr-3) < 0)
 196                         { &rotl($l,     3-$lr); }
 197                 else    { &rotr($l,     $lr-3); }
 198                 }
 199
 200         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
 201         &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
 202         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
 203         &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
 204         &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
 205         &rotr($tt       , 4);
 206         }
 207