crypto/openssl-0.9.7e/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,     $R);
  33
  34         # PIC-ification:-)
  35         &picmeup("edx","DES_SPtrans");
  36         #if ($cpp)      { &picmeup("edx","DES_SPtrans");   }
  37         #else           { &lea("edx",&DWP("DES_SPtrans")); }
  38         &push("edx");   # becomes &swtmp(1)
  39         #
  40         &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
  41
  42         &push(&DWC(25)); # add a variable
  43
  44         &set_label("start");
  45         for ($i=0; $i<16; $i+=2)
  46                 {
  47                 &comment("");
  48                 &comment("Round $i");
  49                 &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
  50
  51                 &comment("");
  52                 &comment("Round ".sprintf("%d",$i+1));
  53                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
  54                 }
  55          &mov("ebx",    &swtmp(0));
  56         &mov("eax",     $L);
  57          &dec("ebx");
  58         &mov($L,        $R);
  59          &mov($R,       "eax");
  60         &mov(&swtmp(0), "ebx");
  61          &jnz(&label("start"));
  62
  63         &comment("");
  64         &comment("FP");
  65         &mov("edx",&wparam(0));
  66
  67         &FP_new($R,$L,"eax",3);
  68         &mov(&DWP(0,"edx","",0),"eax");
  69         &mov(&DWP(4,"edx","",0),$L);
  70
  71         &add("esp",8);  # remove variables
  72
  73         &function_end($name);
  74         }
  75
  76 sub D_ENCRYPT
  77         {
  78         local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
  79
  80         &mov(   $u,             &wparam(2));                    # 2
  81         &mov(   $t,             $R);
  82         &shr(   $t,             16);                            # 1
  83         &mov(   $tmp2,          &wparam(3));                    # 2
  84         &xor(   $t,             $R);                            # 1
  85
  86         &and(   $u,             $t);                            # 2
  87         &and(   $t,             $tmp2);                         # 2
  88
  89         &mov(   $tmp1,          $u);
  90         &shl(   $tmp1,          16);                            # 1
  91         &mov(   $tmp2,          $t);
  92         &shl(   $tmp2,          16);                            # 1
  93         &xor(   $u,             $tmp1);                         # 2
  94         &xor(   $t,             $tmp2);                         # 2
  95         &mov(   $tmp1,          &DWP(&n2a($S*4),$trans,"",0));  # 2
  96         &xor(   $u,             $tmp1);
  97         &mov(   $tmp2,          &DWP(&n2a(($S+1)*4),$trans,"",0));      # 2
  98         &xor(   $u,             $R);
  99         &xor(   $t,             $R);
 100         &xor(   $t,             $tmp2);
 101
 102         &and(   $u,             "0xfcfcfcfc"    );              # 2
 103         &xor(   $tmp1,          $tmp1);                         # 1
 104         &and(   $t,             "0xcfcfcfcf"    );              # 2
 105         &xor(   $tmp2,          $tmp2);
 106         &movb(  &LB($tmp1),     &LB($u) );
 107         &movb(  &LB($tmp2),     &HB($u) );
 108         &rotr(  $t,             4               );
 109         &mov(   $trans,         &swtmp(1));
 110         &xor(   $L,             &DWP("     ",$trans,$tmp1,0));
 111         &movb(  &LB($tmp1),     &LB($t) );
 112         &xor(   $L,             &DWP("0x200",$trans,$tmp2,0));
 113         &movb(  &LB($tmp2),     &HB($t) );
 114         &shr(   $u,             16);
 115         &xor(   $L,             &DWP("0x100",$trans,$tmp1,0));
 116         &movb(  &LB($tmp1),     &HB($u) );
 117         &shr(   $t,             16);
 118         &xor(   $L,             &DWP("0x300",$trans,$tmp2,0));
 119         &movb(  &LB($tmp2),     &HB($t) );
 120         &and(   $u,             "0xff"  );
 121         &and(   $t,             "0xff"  );
 122         &mov(   $tmp1,          &DWP("0x600",$trans,$tmp1,0));
 123         &xor(   $L,             $tmp1);
 124         &mov(   $tmp1,          &DWP("0x700",$trans,$tmp2,0));
 125         &xor(   $L,             $tmp1);
 126         &mov(   $tmp1,          &DWP("0x400",$trans,$u,0));
 127         &xor(   $L,             $tmp1);
 128         &mov(   $tmp1,          &DWP("0x500",$trans,$t,0));
 129         &xor(   $L,             $tmp1);
 130         &mov(   $trans,         &wparam(1));
 131         }
 132
 133 sub n2a
 134         {
 135         sprintf("%d",$_[0]);
 136         }
 137
 138 # now has a side affect of rotating $a by $shift
 139 sub R_PERM_OP
 140         {
 141         local($a,$b,$tt,$shift,$mask,$last)=@_;
 142
 143         &rotl(  $a,             $shift          ) if ($shift != 0);
 144         &mov(   $tt,            $a              );
 145         &xor(   $a,             $b              );
 146         &and(   $a,             $mask           );
 147         if ($notlast eq $b)
 148                 {
 149                 &xor(   $b,             $a              );
 150                 &xor(   $tt,            $a              );
 151                 }
 152         else
 153                 {
 154                 &xor(   $tt,            $a              );
 155                 &xor(   $b,             $a              );
 156                 }
 157         &comment("");
 158         }
 159
 160 sub IP_new
 161         {
 162         local($l,$r,$tt,$lr)=@_;
 163
 164         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
 165         &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
 166         &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
 167         &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
 168         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
 169
 170         if ($lr != 3)
 171                 {
 172                 if (($lr-3) < 0)
 173                         { &rotr($tt,    3-$lr); }
 174                 else    { &rotl($tt,    $lr-3); }
 175                 }
 176         if ($lr != 2)
 177                 {
 178                 if (($lr-2) < 0)
 179                         { &rotr($r,     2-$lr); }
 180                 else    { &rotl($r,     $lr-2); }
 181                 }
 182         }
 183
 184 sub FP_new
 185         {
 186         local($l,$r,$tt,$lr)=@_;
 187
 188         if ($lr != 2)
 189                 {
 190                 if (($lr-2) < 0)
 191                         { &rotl($r,     2-$lr); }
 192                 else    { &rotr($r,     $lr-2); }
 193                 }
 194         if ($lr != 3)
 195                 {
 196                 if (($lr-3) < 0)
 197                         { &rotl($l,     3-$lr); }
 198                 else    { &rotr($l,     $lr-3); }
 199                 }
 200
 201         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
 202         &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
 203         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
 204         &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
 205         &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
 206         &rotr($tt       , 4);
 207         }
 208