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- #! /usr/bin/env perl
- # Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
- #
- # Licensed under the Apache License 2.0 (the "License"). You may not use
- # this file except in compliance with the License. You can obtain a copy
- # in the file LICENSE in the source distribution or at
- # https://www.openssl.org/source/license.html
- # This flag makes the inner loop one cycle longer, but generates
- # code that runs %30 faster on the pentium pro/II, 44% faster
- # of PIII, while only %7 slower on the pentium.
- # By default, this flag is on.
- $ppro=1;
- $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
- push(@INC,"${dir}","${dir}../../perlasm");
- require "x86asm.pl";
- require "cbc.pl";
- $output=pop and open STDOUT,">$output";
- &asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
- $CAST_ROUNDS=16;
- $L="edi";
- $R="esi";
- $K="ebp";
- $tmp1="ecx";
- $tmp2="ebx";
- $tmp3="eax";
- $tmp4="edx";
- $S1="CAST_S_table0";
- $S2="CAST_S_table1";
- $S3="CAST_S_table2";
- $S4="CAST_S_table3";
- @F1=("add","xor","sub");
- @F2=("xor","sub","add");
- @F3=("sub","add","xor");
- &CAST_encrypt("CAST_encrypt",1);
- &CAST_encrypt("CAST_decrypt",0);
- &cbc("CAST_cbc_encrypt","CAST_encrypt","CAST_decrypt",1,4,5,3,-1,-1);
- &asm_finish();
- close STDOUT or die "error closing STDOUT: $!";
- sub CAST_encrypt {
- local($name,$enc)=@_;
- local($win_ex)=<<"EOF";
- EXTERN _CAST_S_table0:DWORD
- EXTERN _CAST_S_table1:DWORD
- EXTERN _CAST_S_table2:DWORD
- EXTERN _CAST_S_table3:DWORD
- EOF
- &main::external_label(
- "CAST_S_table0",
- "CAST_S_table1",
- "CAST_S_table2",
- "CAST_S_table3",
- );
- &function_begin_B($name,$win_ex);
- &comment("");
- &push("ebp");
- &push("ebx");
- &mov($tmp2,&wparam(0));
- &mov($K,&wparam(1));
- &push("esi");
- &push("edi");
- &comment("Load the 2 words");
- &mov($L,&DWP(0,$tmp2,"",0));
- &mov($R,&DWP(4,$tmp2,"",0));
- &comment('Get short key flag');
- &mov($tmp3,&DWP(128,$K,"",0));
- if($enc) {
- &push($tmp3);
- } else {
- &or($tmp3,$tmp3);
- &jnz(&label('cast_dec_skip'));
- }
- &xor($tmp3, $tmp3);
- # encrypting part
- if ($enc) {
- &E_CAST( 0,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 1,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 2,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 3,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 4,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 5,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 6,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 7,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 8,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 9,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(10,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(11,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &comment('test short key flag');
- &pop($tmp4);
- &or($tmp4,$tmp4);
- &jnz(&label('cast_enc_done'));
- &E_CAST(12,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(13,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(14,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(15,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- } else {
- &E_CAST(15,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(14,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(13,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(12,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &set_label('cast_dec_skip');
- &E_CAST(11,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST(10,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 9,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 8,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 7,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 6,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 5,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 4,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 3,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 2,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 1,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
- &E_CAST( 0,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
- }
- &set_label('cast_enc_done') if $enc;
- # Why the nop? - Ben 17/1/99
- &nop();
- &mov($tmp3,&wparam(0));
- &mov(&DWP(4,$tmp3,"",0),$L);
- &mov(&DWP(0,$tmp3,"",0),$R);
- &function_end($name);
- }
- sub E_CAST {
- local($i,$S,$L,$R,$K,$OP1,$OP2,$OP3,$tmp1,$tmp2,$tmp3,$tmp4)=@_;
- # Ri needs to have 16 pre added.
- &comment("round $i");
- &mov( $tmp4, &DWP($i*8,$K,"",1));
- &mov( $tmp1, &DWP($i*8+4,$K,"",1));
- &$OP1( $tmp4, $R);
- &rotl( $tmp4, &LB($tmp1));
- if ($ppro) {
- &xor( $tmp1, $tmp1);
- &mov( $tmp2, 0xff);
- &movb( &LB($tmp1), &HB($tmp4)); # A
- &and( $tmp2, $tmp4);
- &shr( $tmp4, 16); #
- &xor( $tmp3, $tmp3);
- } else {
- &mov( $tmp2, $tmp4); # B
- &movb( &LB($tmp1), &HB($tmp4)); # A # BAD BAD BAD
- &shr( $tmp4, 16); #
- &and( $tmp2, 0xff);
- }
- &movb( &LB($tmp3), &HB($tmp4)); # C # BAD BAD BAD
- &and( $tmp4, 0xff); # D
- &mov( $tmp1, &DWP($S1,"",$tmp1,4));
- &mov( $tmp2, &DWP($S2,"",$tmp2,4));
- &$OP2( $tmp1, $tmp2);
- &mov( $tmp2, &DWP($S3,"",$tmp3,4));
- &$OP3( $tmp1, $tmp2);
- &mov( $tmp2, &DWP($S4,"",$tmp4,4));
- &$OP1( $tmp1, $tmp2);
- # XXX
- &xor( $L, $tmp1);
- # XXX
- }
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