1#! /usr/bin/env perl
2# Copyright 1995-2020 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# The inner loop instruction sequence and the IP/FP modifications are from
10# Svend Olaf Mikkelsen
11
12$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
13push(@INC,"${dir}","${dir}../../perlasm");
14require "x86asm.pl";
15
16$output=pop;
17open STDOUT,">$output";
18
19&asm_init($ARGV[0]);
20
21$L="edi";
22$R="esi";
23
24&external_label("DES_SPtrans");
25&fcrypt_body("fcrypt_body");
26&asm_finish();
27
28close STDOUT or die "error closing STDOUT: $!";
29
30sub fcrypt_body
31	{
32	local($name,$do_ip)=@_;
33
34	&function_begin($name);
35
36	&comment("");
37	&comment("Load the 2 words");
38	$trans="ebp";
39
40	&xor(	$L,	$L);
41	&xor(	$R,	$R);
42
43	# PIC-ification:-)
44	&picmeup("edx","DES_SPtrans");
45	#if ($cpp)	{ &picmeup("edx","DES_SPtrans");   }
46	#else		{ &lea("edx",&DWP("DES_SPtrans")); }
47	&push("edx");	# becomes &swtmp(1)
48	#
49	&mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
50
51	&push(&DWC(25)); # add a variable
52
53	&set_label("start");
54	for ($i=0; $i<16; $i+=2)
55		{
56		&comment("");
57		&comment("Round $i");
58		&D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
59
60		&comment("");
61		&comment("Round ".sprintf("%d",$i+1));
62		&D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
63		}
64	 &mov("ebx",	&swtmp(0));
65	&mov("eax",	$L);
66	 &dec("ebx");
67	&mov($L,	$R);
68	 &mov($R,	"eax");
69	&mov(&swtmp(0),	"ebx");
70	 &jnz(&label("start"));
71
72	&comment("");
73	&comment("FP");
74	&mov("edx",&wparam(0));
75
76	&FP_new($R,$L,"eax",3);
77	&mov(&DWP(0,"edx","",0),"eax");
78	&mov(&DWP(4,"edx","",0),$L);
79
80	&add("esp",8);	# remove variables
81
82	&function_end($name);
83	}
84
85sub D_ENCRYPT
86	{
87	local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
88
89	&mov(	$u,		&wparam(2));			# 2
90	&mov(	$t,		$R);
91	&shr(	$t,		16);				# 1
92	&mov(	$tmp2,		&wparam(3));			# 2
93	&xor(	$t,		$R);				# 1
94
95	&and(	$u,		$t);				# 2
96	&and(	$t,		$tmp2);				# 2
97
98	&mov(	$tmp1,		$u);
99	&shl(	$tmp1,		16); 				# 1
100	&mov(	$tmp2,		$t);
101	&shl(	$tmp2,		16); 				# 1
102	&xor(	$u,		$tmp1);				# 2
103	&xor(	$t,		$tmp2);				# 2
104	&mov(	$tmp1,		&DWP(&n2a($S*4),$trans,"",0));	# 2
105	&xor(	$u,		$tmp1);
106	&mov(	$tmp2,		&DWP(&n2a(($S+1)*4),$trans,"",0));	# 2
107	&xor(	$u,		$R);
108	&xor(	$t,		$R);
109	&xor(	$t,		$tmp2);
110
111	&and(	$u,		"0xfcfcfcfc"	);		# 2
112	&xor(	$tmp1,		$tmp1);				# 1
113	&and(	$t,		"0xcfcfcfcf"	);		# 2
114	&xor(	$tmp2,		$tmp2);
115	&movb(	&LB($tmp1),	&LB($u)	);
116	&movb(	&LB($tmp2),	&HB($u)	);
117	&rotr(	$t,		4		);
118	&mov(	$trans,		&swtmp(1));
119	&xor(	$L,		&DWP("     ",$trans,$tmp1,0));
120	&movb(	&LB($tmp1),	&LB($t)	);
121	&xor(	$L,		&DWP("0x200",$trans,$tmp2,0));
122	&movb(	&LB($tmp2),	&HB($t)	);
123	&shr(	$u,		16);
124	&xor(	$L,		&DWP("0x100",$trans,$tmp1,0));
125	&movb(	&LB($tmp1),	&HB($u)	);
126	&shr(	$t,		16);
127	&xor(	$L,		&DWP("0x300",$trans,$tmp2,0));
128	&movb(	&LB($tmp2),	&HB($t)	);
129	&and(	$u,		"0xff"	);
130	&and(	$t,		"0xff"	);
131	&mov(	$tmp1,		&DWP("0x600",$trans,$tmp1,0));
132	&xor(	$L,		$tmp1);
133	&mov(	$tmp1,		&DWP("0x700",$trans,$tmp2,0));
134	&xor(	$L,		$tmp1);
135	&mov(	$tmp1,		&DWP("0x400",$trans,$u,0));
136	&xor(	$L,		$tmp1);
137	&mov(	$tmp1,		&DWP("0x500",$trans,$t,0));
138	&xor(	$L,		$tmp1);
139	&mov(	$trans,		&wparam(1));
140	}
141
142sub n2a
143	{
144	sprintf("%d",$_[0]);
145	}
146
147# now has a side affect of rotating $a by $shift
148sub R_PERM_OP
149	{
150	local($a,$b,$tt,$shift,$mask,$last)=@_;
151
152	&rotl(	$a,		$shift		) if ($shift != 0);
153	&mov(	$tt,		$a		);
154	&xor(	$a,		$b		);
155	&and(	$a,		$mask		);
156	if ($notlast eq $b)
157		{
158		&xor(	$b,		$a		);
159		&xor(	$tt,		$a		);
160		}
161	else
162		{
163		&xor(	$tt,		$a		);
164		&xor(	$b,		$a		);
165		}
166	&comment("");
167	}
168
169sub IP_new
170	{
171	local($l,$r,$tt,$lr)=@_;
172
173	&R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
174	&R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
175	&R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
176	&R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
177	&R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
178
179	if ($lr != 3)
180		{
181		if (($lr-3) < 0)
182			{ &rotr($tt,	3-$lr); }
183		else	{ &rotl($tt,	$lr-3); }
184		}
185	if ($lr != 2)
186		{
187		if (($lr-2) < 0)
188			{ &rotr($r,	2-$lr); }
189		else	{ &rotl($r,	$lr-2); }
190		}
191	}
192
193sub FP_new
194	{
195	local($l,$r,$tt,$lr)=@_;
196
197	if ($lr != 2)
198		{
199		if (($lr-2) < 0)
200			{ &rotl($r,	2-$lr); }
201		else	{ &rotr($r,	$lr-2); }
202		}
203	if ($lr != 3)
204		{
205		if (($lr-3) < 0)
206			{ &rotl($l,	3-$lr); }
207		else	{ &rotr($l,	$lr-3); }
208		}
209
210	&R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
211	&R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
212	&R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
213	&R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
214	&R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
215	&rotr($tt	, 4);
216	}
217
218