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 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  10 push(@INC,"${dir}","${dir}../../perlasm");
  11 require "x86asm.pl";
  12
  13 $output=pop;
  14 open STDOUT,">$output";
  15
  16 &asm_init($ARGV[0],"crypt586.pl");
  17
  18 $L="edi";
  19 $R="esi";
  20
  21 &external_label("DES_SPtrans");
  22 &fcrypt_body("fcrypt_body");
  23 &asm_finish();
  24
  25 close STDOUT;
  26
  27 sub fcrypt_body
  28         {
  29         local($name,$do_ip)=@_;
  30
  31         &function_begin($name);
  32
  33         &comment("");
  34         &comment("Load the 2 words");
  35         $trans="ebp";
  36
  37         &xor(   $L,     $L);
  38         &xor(   $R,     $R);
  39
  40         # PIC-ification:-)
  41         &picmeup("edx","DES_SPtrans");
  42         #if ($cpp)      { &picmeup("edx","DES_SPtrans");   }
  43         #else           { &lea("edx",&DWP("DES_SPtrans")); }
  44         &push("edx");   # becomes &swtmp(1)
  45         #
  46         &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
  47
  48         &push(&DWC(25)); # add a variable
  49
  50         &set_label("start");
  51         for ($i=0; $i<16; $i+=2)
  52                 {
  53                 &comment("");
  54                 &comment("Round $i");
  55                 &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
  56
  57                 &comment("");
  58                 &comment("Round ".sprintf("%d",$i+1));
  59                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
  60                 }
  61          &mov("ebx",    &swtmp(0));
  62         &mov("eax",     $L);
  63          &dec("ebx");
  64         &mov($L,        $R);
  65          &mov($R,       "eax");
  66         &mov(&swtmp(0), "ebx");
  67          &jnz(&label("start"));
  68
  69         &comment("");
  70         &comment("FP");
  71         &mov("edx",&wparam(0));
  72
  73         &FP_new($R,$L,"eax",3);
  74         &mov(&DWP(0,"edx","",0),"eax");
  75         &mov(&DWP(4,"edx","",0),$L);
  76
  77         &add("esp",8);  # remove variables
  78
  79         &function_end($name);
  80         }
  81
  82 sub D_ENCRYPT
  83         {
  84         local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
  85
  86         &mov(   $u,             &wparam(2));                    # 2
  87         &mov(   $t,             $R);
  88         &shr(   $t,             16);                            # 1
  89         &mov(   $tmp2,          &wparam(3));                    # 2
  90         &xor(   $t,             $R);                            # 1
  91
  92         &and(   $u,             $t);                            # 2
  93         &and(   $t,             $tmp2);                         # 2
  94
  95         &mov(   $tmp1,          $u);
  96         &shl(   $tmp1,          16);                            # 1
  97         &mov(   $tmp2,          $t);
  98         &shl(   $tmp2,          16);                            # 1
  99         &xor(   $u,             $tmp1);                         # 2
 100         &xor(   $t,             $tmp2);                         # 2
 101         &mov(   $tmp1,          &DWP(&n2a($S*4),$trans,"",0));  # 2
 102         &xor(   $u,             $tmp1);
 103         &mov(   $tmp2,          &DWP(&n2a(($S+1)*4),$trans,"",0));      # 2
 104         &xor(   $u,             $R);
 105         &xor(   $t,             $R);
 106         &xor(   $t,             $tmp2);
 107
 108         &and(   $u,             "0xfcfcfcfc"    );              # 2
 109         &xor(   $tmp1,          $tmp1);                         # 1
 110         &and(   $t,             "0xcfcfcfcf"    );              # 2
 111         &xor(   $tmp2,          $tmp2);
 112         &movb(  &LB($tmp1),     &LB($u) );
 113         &movb(  &LB($tmp2),     &HB($u) );
 114         &rotr(  $t,             4               );
 115         &mov(   $trans,         &swtmp(1));
 116         &xor(   $L,             &DWP("     ",$trans,$tmp1,0));
 117         &movb(  &LB($tmp1),     &LB($t) );
 118         &xor(   $L,             &DWP("0x200",$trans,$tmp2,0));
 119         &movb(  &LB($tmp2),     &HB($t) );
 120         &shr(   $u,             16);
 121         &xor(   $L,             &DWP("0x100",$trans,$tmp1,0));
 122         &movb(  &LB($tmp1),     &HB($u) );
 123         &shr(   $t,             16);
 124         &xor(   $L,             &DWP("0x300",$trans,$tmp2,0));
 125         &movb(  &LB($tmp2),     &HB($t) );
 126         &and(   $u,             "0xff"  );
 127         &and(   $t,             "0xff"  );
 128         &mov(   $tmp1,          &DWP("0x600",$trans,$tmp1,0));
 129         &xor(   $L,             $tmp1);
 130         &mov(   $tmp1,          &DWP("0x700",$trans,$tmp2,0));
 131         &xor(   $L,             $tmp1);
 132         &mov(   $tmp1,          &DWP("0x400",$trans,$u,0));
 133         &xor(   $L,             $tmp1);
 134         &mov(   $tmp1,          &DWP("0x500",$trans,$t,0));
 135         &xor(   $L,             $tmp1);
 136         &mov(   $trans,         &wparam(1));
 137         }
 138
 139 sub n2a
 140         {
 141         sprintf("%d",$_[0]);
 142         }
 143
 144 # now has a side affect of rotating $a by $shift
 145 sub R_PERM_OP
 146         {
 147         local($a,$b,$tt,$shift,$mask,$last)=@_;
 148
 149         &rotl(  $a,             $shift          ) if ($shift != 0);
 150         &mov(   $tt,            $a              );
 151         &xor(   $a,             $b              );
 152         &and(   $a,             $mask           );
 153         if ($notlast eq $b)
 154                 {
 155                 &xor(   $b,             $a              );
 156                 &xor(   $tt,            $a              );
 157                 }
 158         else
 159                 {
 160                 &xor(   $tt,            $a              );
 161                 &xor(   $b,             $a              );
 162                 }
 163         &comment("");
 164         }
 165
 166 sub IP_new
 167         {
 168         local($l,$r,$tt,$lr)=@_;
 169
 170         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
 171         &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
 172         &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
 173         &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
 174         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
 175
 176         if ($lr != 3)
 177                 {
 178                 if (($lr-3) < 0)
 179                         { &rotr($tt,    3-$lr); }
 180                 else    { &rotl($tt,    $lr-3); }
 181                 }
 182         if ($lr != 2)
 183                 {
 184                 if (($lr-2) < 0)
 185                         { &rotr($r,     2-$lr); }
 186                 else    { &rotl($r,     $lr-2); }
 187                 }
 188         }
 189
 190 sub FP_new
 191         {
 192         local($l,$r,$tt,$lr)=@_;
 193
 194         if ($lr != 2)
 195                 {
 196                 if (($lr-2) < 0)
 197                         { &rotl($r,     2-$lr); }
 198                 else    { &rotr($r,     $lr-2); }
 199                 }
 200         if ($lr != 3)
 201                 {
 202                 if (($lr-3) < 0)
 203                         { &rotl($l,     3-$lr); }
 204                 else    { &rotr($l,     $lr-3); }
 205                 }
 206
 207         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
 208         &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
 209         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
 210         &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
 211         &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
 212         &rotr($tt       , 4);
 213         }
 214