crypto/cast/asm/cast-586.pl

   1 #!/usr/local/bin/perl
   2
   3 # define for pentium pro friendly version
   4 $ppro=1;
   5
   6 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
   7 push(@INC,"${dir}","${dir}../../perlasm");
   8 require "x86asm.pl";
   9 require "cbc.pl";
  10
  11 &asm_init($ARGV[0],"cast-586.pl",$ARGV[$#ARGV] eq "386");
  12
  13 $CAST_ROUNDS=16;
  14 $L="edi";
  15 $R="esi";
  16 $K="ebp";
  17 $tmp1="ecx";
  18 $tmp2="ebx";
  19 $tmp3="eax";
  20 $tmp4="edx";
  21 $S1="CAST_S_table0";
  22 $S2="CAST_S_table1";
  23 $S3="CAST_S_table2";
  24 $S4="CAST_S_table3";
  25
  26 @F1=("add","xor","sub");
  27 @F2=("xor","sub","add");
  28 @F3=("sub","add","xor");
  29
  30 &CAST_encrypt("CAST_encrypt",1);
  31 &CAST_encrypt("CAST_decrypt",0);
  32 &cbc("CAST_cbc_encrypt","CAST_encrypt","CAST_decrypt",1,4,5,3,-1,-1);
  33
  34 &asm_finish();
  35
  36 sub CAST_encrypt {
  37     local($name,$enc)=@_;
  38
  39     local($win_ex)=<<"EOF";
  40 EXTERN  _CAST_S_table0:DWORD
  41 EXTERN  _CAST_S_table1:DWORD
  42 EXTERN  _CAST_S_table2:DWORD
  43 EXTERN  _CAST_S_table3:DWORD
  44 EOF
  45     &main::external_label(
  46                           "CAST_S_table0",
  47                           "CAST_S_table1",
  48                           "CAST_S_table2",
  49                           "CAST_S_table3",
  50                           );
  51
  52     &function_begin_B($name,$win_ex);
  53
  54     &comment("");
  55
  56     &push("ebp");
  57     &push("ebx");
  58     &mov($tmp2,&wparam(0));
  59     &mov($K,&wparam(1));
  60     &push("esi");
  61     &push("edi");
  62
  63     &comment("Load the 2 words");
  64     &mov($L,&DWP(0,$tmp2,"",0));
  65     &mov($R,&DWP(4,$tmp2,"",0));
  66
  67     &comment('Get short key flag');
  68     &mov($tmp3,&DWP(128,$K,"",0));
  69     if($enc) {
  70         &push($tmp3);
  71     } else {
  72         &or($tmp3,$tmp3);
  73         &jnz(&label('cast_dec_skip'));
  74     }
  75
  76     &xor($tmp3, $tmp3);
  77
  78     # encrypting part
  79
  80     if ($enc) {
  81         &E_CAST( 0,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  82         &E_CAST( 1,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  83         &E_CAST( 2,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
  84         &E_CAST( 3,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  85         &E_CAST( 4,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  86         &E_CAST( 5,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
  87         &E_CAST( 6,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  88         &E_CAST( 7,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  89         &E_CAST( 8,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
  90         &E_CAST( 9,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  91         &E_CAST(10,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  92         &E_CAST(11,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
  93         &comment('test short key flag');
  94         &pop($tmp4);
  95         &or($tmp4,$tmp4);
  96         &jnz(&label('cast_enc_done'));
  97         &E_CAST(12,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  98         &E_CAST(13,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  99         &E_CAST(14,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 100         &E_CAST(15,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 101     } else {
 102         &E_CAST(15,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 103         &E_CAST(14,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 104         &E_CAST(13,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 105         &E_CAST(12,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 106         &set_label('cast_dec_skip');
 107         &E_CAST(11,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 108         &E_CAST(10,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 109         &E_CAST( 9,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 110         &E_CAST( 8,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 111         &E_CAST( 7,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 112         &E_CAST( 6,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 113         &E_CAST( 5,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 114         &E_CAST( 4,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 115         &E_CAST( 3,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 116         &E_CAST( 2,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 117         &E_CAST( 1,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 118         &E_CAST( 0,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 119     }
 120
 121     &set_label('cast_enc_done') if $enc;
 122 # Why the nop? - Ben 17/1/99
 123     &nop();
 124     &mov($tmp3,&wparam(0));
 125     &mov(&DWP(4,$tmp3,"",0),$L);
 126     &mov(&DWP(0,$tmp3,"",0),$R);
 127     &function_end($name);
 128 }
 129
 130 sub E_CAST {
 131     local($i,$S,$L,$R,$K,$OP1,$OP2,$OP3,$tmp1,$tmp2,$tmp3,$tmp4)=@_;
 132     # Ri needs to have 16 pre added.
 133
 134     &comment("round $i");
 135     &mov(       $tmp4,          &DWP($i*8,$K,"",1));
 136
 137     &mov(       $tmp1,          &DWP($i*8+4,$K,"",1));
 138     &$OP1(      $tmp4,          $R);
 139
 140     &rotl(      $tmp4,          &LB($tmp1));
 141
 142     if ($ppro) {
 143         &mov(   $tmp2,          $tmp4);         # B
 144         &xor(   $tmp1,          $tmp1);
 145
 146         &movb(  &LB($tmp1),     &HB($tmp4));    # A
 147         &and(   $tmp2,          0xff);
 148
 149         &shr(   $tmp4,          16);            #
 150         &xor(   $tmp3,          $tmp3);
 151     } else {
 152         &mov(   $tmp2,          $tmp4);         # B
 153         &movb(  &LB($tmp1),     &HB($tmp4));    # A     # BAD BAD BAD
 154
 155         &shr(   $tmp4,          16);            #
 156         &and(   $tmp2,          0xff);
 157     }
 158
 159     &movb(      &LB($tmp3),     &HB($tmp4));    # C     # BAD BAD BAD
 160     &and(       $tmp4,          0xff);          # D
 161
 162     &mov(       $tmp1,          &DWP($S1,"",$tmp1,4));
 163     &mov(       $tmp2,          &DWP($S2,"",$tmp2,4));
 164
 165     &$OP2(      $tmp1,          $tmp2);
 166     &mov(       $tmp2,          &DWP($S3,"",$tmp3,4));
 167
 168     &$OP3(      $tmp1,          $tmp2);
 169     &mov(       $tmp2,          &DWP($S4,"",$tmp4,4));
 170
 171     &$OP1(      $tmp1,          $tmp2);
 172     # XXX
 173
 174     &xor(       $L,             $tmp1);
 175     # XXX
 176 }
 177