#!/usr/local/bin/perl## The inner loop instruction sequence and the IP/FP modifications are from# Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk># I've added the stuff needed for crypt() but I've not worried about making# things perfect.#push(@INC,"perlasm","../../perlasm");require "x86asm.pl";&asm_init($ARGV[0],"crypt586.pl");$L="edi";$R="esi";&external_label("des_SPtrans");&fcrypt_body("fcrypt_body");&asm_finish();sub fcrypt_body	{	local($name,$do_ip)=@_;	&function_begin($name,"EXTRN   _des_SPtrans:DWORD");	&comment("");	&comment("Load the 2 words");	$ks="ebp";	&xor(	$L,	$L);	&xor(	$R,	$R);	&mov($ks,&wparam(1));	&push(&DWC(25)); # add a variable	&set_label("start");	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");		}	 &mov("ebx",	&swtmp(0));	&mov("eax",	$L);	 &dec("ebx");	&mov($L,	$R);	 &mov($R,	"eax");	&mov(&swtmp(0),	"ebx");	 &jnz(&label("start"));	&comment("");	&comment("FP");	&mov("edx",&wparam(0));	&FP_new($R,$L,"eax",3);	&mov(&DWP(0,"edx","",0),"eax");	&mov(&DWP(4,"edx","",0),$L);	&pop("ecx");	# remove variable	&function_end($name);	}sub D_ENCRYPT	{	local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;	&mov(	$u,		&wparam(2));			# 2	&mov(	$t,		$R);	&shr(	$t,		16);				# 1	&mov(	$tmp2,		&wparam(3));			# 2	&xor(	$t,		$R);				# 1	&and(	$u,		$t);				# 2	&and(	$t,		$tmp2);				# 2	&mov(	$tmp1,		$u);	&shl(	$tmp1,		16); 				# 1	&mov(	$tmp2,		$t);	&shl(	$tmp2,		16); 				# 1	&xor(	$u,		$tmp1);				# 2	&xor(	$t,		$tmp2);				# 2	&mov(	$tmp1,		&DWP(&n2a($S*4),$ks,"",0));	# 2	&xor(	$u,		$tmp1);	&mov(	$tmp2,		&DWP(&n2a(($S+1)*4),$ks,"",0));	# 2	&xor(	$u,		$R);	&xor(	$t,		$R);	&xor(	$t,		$tmp2);	&and(	$u,		"0xfcfcfcfc"	);		# 2	&xor(	$tmp1,		$tmp1);				# 1	&and(	$t,		"0xcfcfcfcf"	);		# 2	&xor(	$tmp2,		$tmp2);		&movb(	&LB($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,		$mask		);	if ($notlast 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);	}