crypto/openssl-0.9.7e/crypto/cast/asm/cast-586.pl

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