cast-586.pl

openssl是ssl的开源项目

#!/usr/local/bin/perl

# define for pentium pro friendly version
$ppro=1;

push(@INC,"perlasm","../../perlasm");
require "x86asm.pl";
require "cbc.pl";

&asm_init($ARGV[0],"cast-586.pl");

$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();

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));

	&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,$tmp4);
		&E_CAST(12,$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,$tmp4,1);
		}
	else
		{
		&E_CAST(15,$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,$tmp4);
		&E_CAST(11,$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,$tmp4,1);
		}

	&nop();
	&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,$lst)=@_;
	# Ri needs to have 16 pre added.

	&comment("round $i");
	&mov(	$tmp4,		&DWP($i*8,$K,"",1));

	&mov(	$tmp1,		&DWP($i*8+4,$K,"",1));# must be word
	&$OP1(	$tmp4,		$R);

	&rotl(	$tmp4,		&LB($tmp1));

	if ($ppro)
		{
		&mov(	$tmp2,		$tmp4);		# B
		&xor(	$tmp1,		$tmp1);

		&movb(	&LB($tmp1),	&HB($tmp4));	# A
		&and(	$tmp2,		0xff);

		&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,		$tmp2);
	 &mov($tmp3,&wparam(0)) if $lst;
	 # XXX

	&xor(	$L,		$tmp1);
	 # XXX
	}