xref: /openssl/crypto/bf/asm/bf-586.pl (revision 33388b44)
1#! /usr/bin/env perl
2# Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the Apache License 2.0 (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
10$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
11push(@INC,"${dir}","${dir}../../perlasm");
12require "x86asm.pl";
13require "cbc.pl";
14
15$output = pop and open STDOUT,">$output";
16
17&asm_init($ARGV[0],$ARGV[$#ARGV] eq "386");
18
19$BF_ROUNDS=16;
20$BF_OFF=($BF_ROUNDS+2)*4;
21$L="edi";
22$R="esi";
23$P="ebp";
24$tmp1="eax";
25$tmp2="ebx";
26$tmp3="ecx";
27$tmp4="edx";
28
29&BF_encrypt("BF_encrypt",1);
30&BF_encrypt("BF_decrypt",0);
31&cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
32&asm_finish();
33
34close STDOUT or die "error closing STDOUT: $!";
35
36sub BF_encrypt
37	{
38	local($name,$enc)=@_;
39
40	&function_begin_B($name,"");
41
42	&comment("");
43
44	&push("ebp");
45	&push("ebx");
46	&mov($tmp2,&wparam(0));
47	&mov($P,&wparam(1));
48	&push("esi");
49	&push("edi");
50
51	&comment("Load the 2 words");
52	&mov($L,&DWP(0,$tmp2,"",0));
53	&mov($R,&DWP(4,$tmp2,"",0));
54
55	&xor(	$tmp1,	$tmp1);
56
57	# encrypting part
58
59	if ($enc)
60		{
61		 &mov($tmp2,&DWP(0,$P,"",0));
62		&xor(	$tmp3,	$tmp3);
63
64		&xor($L,$tmp2);
65		for ($i=0; $i<$BF_ROUNDS; $i+=2)
66			{
67			&comment("");
68			&comment("Round $i");
69			&BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
70
71			&comment("");
72			&comment("Round ".sprintf("%d",$i+1));
73			&BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
74			}
75		# &mov($tmp1,&wparam(0)); In last loop
76		&mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
77		}
78	else
79		{
80		 &mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
81		&xor(	$tmp3,	$tmp3);
82
83		&xor($L,$tmp2);
84		for ($i=$BF_ROUNDS; $i>0; $i-=2)
85			{
86			&comment("");
87			&comment("Round $i");
88			&BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
89			&comment("");
90			&comment("Round ".sprintf("%d",$i-1));
91			&BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
92			}
93		# &mov($tmp1,&wparam(0)); In last loop
94		&mov($tmp4,&DWP(0,$P,"",0));
95		}
96
97	&xor($R,$tmp4);
98	&mov(&DWP(4,$tmp1,"",0),$L);
99
100	&mov(&DWP(0,$tmp1,"",0),$R);
101	&function_end($name);
102	}
103
104sub BF_ENCRYPT
105	{
106	local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
107
108	&mov(	$tmp4,		&DWP(&n2a($i*4),$P,"",0)); # for next round
109
110	&mov(	$tmp2,		$R);
111	&xor(	$L,		$tmp4);
112
113	&shr(	$tmp2,		16);
114	&mov(	$tmp4,		$R);
115
116	&movb(	&LB($tmp1),	&HB($tmp2));	# A
117	&and(	$tmp2,		0xff);		# B
118
119	&movb(	&LB($tmp3),	&HB($tmp4));	# C
120	&and(	$tmp4,		0xff);		# D
121
122	&mov(	$tmp1,		&DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
123	&mov(	$tmp2,		&DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
124
125	&add(	$tmp2,		$tmp1);
126	&mov(	$tmp1,		&DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
127
128	&xor(	$tmp2,		$tmp1);
129	&mov(	$tmp4,		&DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
130
131	&add(	$tmp2,		$tmp4);
132	if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
133		{ &xor(	$tmp1,		$tmp1); }
134	else
135		{
136		&comment("Load parameter 0 ($i) enc=$enc");
137		&mov($tmp1,&wparam(0));
138		} # In last loop
139
140	&xor(	$L,		$tmp2);
141	# delay
142	}
143
144sub n2a
145	{
146	sprintf("%d",$_[0]);
147	}
148
149