#!/usr/local/bin/perl## The inner loop instruction sequence and the IP/FP modifications are from# Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk>#push(@INC,"perlasm","../../perlasm");require "x86asm.pl";require "cbc.pl";require "desboth.pl";# base code is in microsft# op dest, source# format.#&asm_init($ARGV[0],"des-586.pl");$L="edi";$R="esi";&external_label("des_SPtrans");&des_encrypt("des_encrypt1",1);&des_encrypt("des_encrypt2",0);&des_encrypt3("des_encrypt3",1);&des_encrypt3("des_decrypt3",0);&cbc("des_ncbc_encrypt","des_encrypt1","des_encrypt1",0,4,5,3,5,-1);&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",0,6,7,3,4,5);&asm_finish();sub des_encrypt	{	local($name,$do_ip)=@_;	&function_begin_B($name,"EXTRN   _des_SPtrans:DWORD");	&push("esi");	&push("edi");	&comment("");	&comment("Load the 2 words");	$ks="ebp";	if ($do_ip)		{		&mov($R,&wparam(0));		 &xor(	"ecx",		"ecx"		);		&push("ebx");		&push("ebp");		&mov("eax",&DWP(0,$R,"",0));		 &mov("ebx",&wparam(2));	# get encrypt flag		&mov($L,&DWP(4,$R,"",0));		&comment("");		&comment("IP");		&IP_new("eax",$L,$R,3);		}	else		{		&mov("eax",&wparam(0));		 &xor(	"ecx",		"ecx"		);		&push("ebx");		&push("ebp");		&mov($R,&DWP(0,"eax","",0));		 &mov("ebx",&wparam(2));	# get encrypt flag		&rotl($R,3);		&mov($L,&DWP(4,"eax","",0));		&rotl($L,3);		}	&mov(	$ks,		&wparam(1)	);	&cmp("ebx","0");	&je(&label("start_decrypt"));	for ($i=0; $i<16; $i+=2)		{		&comment("");		&comment("Round $i");		&D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");		&comment("");		&comment("Round ".sprintf("%d",$i+1));		&D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");		}	&jmp(&label("end"));	&set_label("start_decrypt");	for ($i=15; $i>0; $i-=2)		{		&comment("");		&comment("Round $i");		&D_ENCRYPT(15-$i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");		&comment("");		&comment("Round ".sprintf("%d",$i-1));		&D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");		}	&set_label("end");	if ($do_ip)		{		&comment("");		&comment("FP");		&mov("edx",&wparam(0));		&FP_new($L,$R,"eax",3);		&mov(&DWP(0,"edx","",0),"eax");		&mov(&DWP(4,"edx","",0),$R);		}	else		{		&comment("");		&comment("Fixup");		&rotr($L,3);		# r		 &mov("eax",&wparam(0));		&rotr($R,3);		# l		 &mov(&DWP(0,"eax","",0),$L);		 &mov(&DWP(4,"eax","",0),$R);		}	&pop("ebp");	&pop("ebx");	&pop("edi");	&pop("esi");	&ret();	&function_end_B($name);	}sub D_ENCRYPT	{	local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;	 &mov(	$u,		&DWP(&n2a($S*4),$ks,"",0));	&xor(	$tmp1,		$tmp1);	 &mov(	$t,		&DWP(&n2a(($S+1)*4),$ks,"",0));	&xor(	$u,		$R);	 &xor(	$t,		$R);	&and(	$u,		"0xfcfcfcfc"	);	 &and(	$t,		"0xcfcfcfcf"	);	&movb(	&LB($tmp1),	&LB($u)	);	 &movb(	&LB($tmp2),	&HB($u)	);	&rotr(	$t,		4		);	&mov(	$ks,		&DWP("      $desSP",$tmp1,"",0));	 &movb(	&LB($tmp1),	&LB($t)	);	&xor(	$L,		$ks);	 &mov(	$ks,		&DWP("0x200+$desSP",$tmp2,"",0));	&xor(	$L,		$ks); ######	 &movb(	&LB($tmp2),	&HB($t)	);	&shr(	$u,		16);	 &mov(	$ks,		&DWP("0x100+$desSP",$tmp1,"",0));	&xor(	$L,		$ks); ######	 &movb(	&LB($tmp1),	&HB($u)	);	&shr(	$t,		16);	 &mov(	$ks,		&DWP("0x300+$desSP",$tmp2,"",0));	&xor(	$L,		$ks);	 &mov(	$ks,		&wparam(1)	);	&movb(	&LB($tmp2),	&HB($t)	);	 &and(	$u,		"0xff"	);	&and(	$t,		"0xff"	);	 &mov(	$tmp1,		&DWP("0x600+$desSP",$tmp1,"",0));	&xor(	$L,		$tmp1);	 &mov(	$tmp1,		&DWP("0x700+$desSP",$tmp2,"",0));	&xor(	$L,		$tmp1);	 &mov(	$tmp1,		&DWP("0x400+$desSP",$u,"",0));	&xor(	$L,		$tmp1);	 &mov(	$tmp1,		&DWP("0x500+$desSP",$t,"",0));	&xor(	$L,		$tmp1);	}sub n2a	{	sprintf("%d",$_[0]);	}# now has a side affect of rotating $a by $shiftsub R_PERM_OP	{	local($a,$b,$tt,$shift,$mask,$last)=@_;	&rotl(	$a,		$shift		) if ($shift != 0);	&mov(	$tt,		$a		);	&xor(	$a,		$b		);	&and(	$a,		$mask		);	# This can never succeed, and besides it is difficult to see what the	# idea was - Ben 13 Feb 99	if (!$last eq $b)		{		&xor(	$b,		$a		);		&xor(	$tt,		$a		);		}	else		{		&xor(	$tt,		$a		);		&xor(	$b,		$a		);		}	&comment("");	}sub IP_new	{	local($l,$r,$tt,$lr)=@_;	&R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);	&R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);	&R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);	&R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);	&R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);		if ($lr != 3)		{		if (($lr-3) < 0)			{ &rotr($tt,	3-$lr); }		else	{ &rotl($tt,	$lr-3); }		}	if ($lr != 2)		{		if (($lr-2) < 0)			{ &rotr($r,	2-$lr); }		else	{ &rotl($r,	$lr-2); }		}	}sub FP_new	{	local($l,$r,$tt,$lr)=@_;	if ($lr != 2)		{		if (($lr-2) < 0)			{ &rotl($r,	2-$lr); }		else	{ &rotr($r,	$lr-2); }		}	if ($lr != 3)		{		if (($lr-3) < 0)			{ &rotl($l,	3-$lr); }		else	{ &rotr($l,	$lr-3); }		}	&R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);	&R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);	&R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);	&R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);	&R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);	&rotr($tt	, 4);	}