crypto/cast/asm/cast-586.pl

   1 #! /usr/bin/env perl
   2 # Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 # This flag makes the inner loop one cycle longer, but generates
  11 # code that runs %30 faster on the pentium pro/II, 44% faster
  12 # of PIII, while only %7 slower on the pentium.
  13 # By default, this flag is on.
  14 $ppro=1;
  15
  16 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
  17 push(@INC,"${dir}","${dir}../../perlasm");
  18 require "x86asm.pl";
  19 require "cbc.pl";
  20
  21 $output=pop;
  22 open STDOUT,">$output";
  23
  24 &asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
  25
  26 $CAST_ROUNDS=16;
  27 $L="edi";
  28 $R="esi";
  29 $K="ebp";
  30 $tmp1="ecx";
  31 $tmp2="ebx";
  32 $tmp3="eax";
  33 $tmp4="edx";
  34 $S1="CAST_S_table0";
  35 $S2="CAST_S_table1";
  36 $S3="CAST_S_table2";
  37 $S4="CAST_S_table3";
  38
  39 @F1=("add","xor","sub");
  40 @F2=("xor","sub","add");
  41 @F3=("sub","add","xor");
  42
  43 &CAST_encrypt("CAST_encrypt",1);
  44 &CAST_encrypt("CAST_decrypt",0);
  45 &cbc("CAST_cbc_encrypt","CAST_encrypt","CAST_decrypt",1,4,5,3,-1,-1);
  46
  47 &asm_finish();
  48
  49 close STDOUT;
  50
  51 sub CAST_encrypt {
  52     local($name,$enc)=@_;
  53
  54     local($win_ex)=<<"EOF";
  55 EXTERN  _CAST_S_table0:DWORD
  56 EXTERN  _CAST_S_table1:DWORD
  57 EXTERN  _CAST_S_table2:DWORD
  58 EXTERN  _CAST_S_table3:DWORD
  59 EOF
  60     &main::external_label(
  61                           "CAST_S_table0",
  62                           "CAST_S_table1",
  63                           "CAST_S_table2",
  64                           "CAST_S_table3",
  65                           );
  66
  67     &function_begin_B($name,$win_ex);
  68
  69     &comment("");
  70
  71     &push("ebp");
  72     &push("ebx");
  73     &mov($tmp2,&wparam(0));
  74     &mov($K,&wparam(1));
  75     &push("esi");
  76     &push("edi");
  77
  78     &comment("Load the 2 words");
  79     &mov($L,&DWP(0,$tmp2,"",0));
  80     &mov($R,&DWP(4,$tmp2,"",0));
  81
  82     &comment('Get short key flag');
  83     &mov($tmp3,&DWP(128,$K,"",0));
  84     if($enc) {
  85         &push($tmp3);
  86     } else {
  87         &or($tmp3,$tmp3);
  88         &jnz(&label('cast_dec_skip'));
  89     }
  90
  91     &xor($tmp3, $tmp3);
  92
  93     # encrypting part
  94
  95     if ($enc) {
  96         &E_CAST( 0,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
  97         &E_CAST( 1,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
  98         &E_CAST( 2,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
  99         &E_CAST( 3,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 100         &E_CAST( 4,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 101         &E_CAST( 5,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 102         &E_CAST( 6,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 103         &E_CAST( 7,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 104         &E_CAST( 8,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 105         &E_CAST( 9,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 106         &E_CAST(10,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 107         &E_CAST(11,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 108         &comment('test short key flag');
 109         &pop($tmp4);
 110         &or($tmp4,$tmp4);
 111         &jnz(&label('cast_enc_done'));
 112         &E_CAST(12,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 113         &E_CAST(13,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 114         &E_CAST(14,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 115         &E_CAST(15,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 116     } else {
 117         &E_CAST(15,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 118         &E_CAST(14,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 119         &E_CAST(13,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 120         &E_CAST(12,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 121         &set_label('cast_dec_skip');
 122         &E_CAST(11,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 123         &E_CAST(10,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 124         &E_CAST( 9,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 125         &E_CAST( 8,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 126         &E_CAST( 7,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 127         &E_CAST( 6,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 128         &E_CAST( 5,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 129         &E_CAST( 4,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 130         &E_CAST( 3,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 131         &E_CAST( 2,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
 132         &E_CAST( 1,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
 133         &E_CAST( 0,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
 134     }
 135
 136     &set_label('cast_enc_done') if $enc;
 137 # Why the nop? - Ben 17/1/99
 138     &nop();
 139     &mov($tmp3,&wparam(0));
 140     &mov(&DWP(4,$tmp3,"",0),$L);
 141     &mov(&DWP(0,$tmp3,"",0),$R);
 142     &function_end($name);
 143 }
 144
 145 sub E_CAST {
 146     local($i,$S,$L,$R,$K,$OP1,$OP2,$OP3,$tmp1,$tmp2,$tmp3,$tmp4)=@_;
 147     # Ri needs to have 16 pre added.
 148
 149     &comment("round $i");
 150     &mov(       $tmp4,          &DWP($i*8,$K,"",1));
 151
 152     &mov(       $tmp1,          &DWP($i*8+4,$K,"",1));
 153     &$OP1(      $tmp4,          $R);
 154
 155     &rotl(      $tmp4,          &LB($tmp1));
 156
 157     if ($ppro) {
 158         &xor(   $tmp1,          $tmp1);
 159         &mov(   $tmp2,          0xff);
 160
 161         &movb(  &LB($tmp1),     &HB($tmp4));    # A
 162         &and(   $tmp2,          $tmp4);
 163
 164         &shr(   $tmp4,          16);            #
 165         &xor(   $tmp3,          $tmp3);
 166     } else {
 167         &mov(   $tmp2,          $tmp4);         # B
 168         &movb(  &LB($tmp1),     &HB($tmp4));    # A     # BAD BAD BAD
 169
 170         &shr(   $tmp4,          16);            #
 171         &and(   $tmp2,          0xff);
 172     }
 173
 174     &movb(      &LB($tmp3),     &HB($tmp4));    # C     # BAD BAD BAD
 175     &and(       $tmp4,          0xff);          # D
 176
 177     &mov(       $tmp1,          &DWP($S1,"",$tmp1,4));
 178     &mov(       $tmp2,          &DWP($S2,"",$tmp2,4));
 179
 180     &$OP2(      $tmp1,          $tmp2);
 181     &mov(       $tmp2,          &DWP($S3,"",$tmp3,4));
 182
 183     &$OP3(      $tmp1,          $tmp2);
 184     &mov(       $tmp2,          &DWP($S4,"",$tmp4,4));
 185
 186     &$OP1(      $tmp1,          $tmp2);
 187     # XXX
 188
 189     &xor(       $L,             $tmp1);
 190     # XXX
 191 }
 192