1#!/usr/local/bin/perl
2
3$prog="des686.pl";
4
5# base code is in microsft
6# op dest, source
7# format.
8#
9
10# WILL NOT WORK ANYMORE WITH desboth.pl
11require "desboth.pl";
12
13if (	($ARGV[0] eq "elf"))
14	{ require "x86unix.pl"; }
15elsif (	($ARGV[0] eq "a.out"))
16	{ $aout=1; require "x86unix.pl"; }
17elsif (	($ARGV[0] eq "sol"))
18	{ $sol=1; require "x86unix.pl"; }
19elsif ( ($ARGV[0] eq "cpp"))
20	{ $cpp=1; require "x86unix.pl"; }
21elsif (	($ARGV[0] eq "win32"))
22	{ require "x86ms.pl"; }
23else
24	{
25	print STDERR <<"EOF";
26Pick one target type from
27	elf	- linux, FreeBSD etc
28	a.out	- old linux
29	sol	- x86 solaris
30	cpp	- format so x86unix.cpp can be used
31	win32	- Windows 95/Windows NT
32EOF
33	exit(1);
34	}
35
36&comment("Don't even think of reading this code");
37&comment("It was automatically generated by $prog");
38&comment("Which is a perl program used to generate the x86 assember for");
39&comment("any of elf, a.out, Win32, or Solaris");
40&comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+");
41&comment("eric <eay\@cryptsoft.com>");
42&comment("");
43
44&file("dx86xxxx");
45
46$L="edi";
47$R="esi";
48
49&DES_encrypt("DES_encrypt1",1);
50&DES_encrypt("DES_encrypt2",0);
51
52&DES_encrypt3("DES_encrypt3",1);
53&DES_encrypt3("DES_decrypt3",0);
54
55&file_end();
56
57sub DES_encrypt
58	{
59	local($name,$do_ip)=@_;
60
61	&function_begin($name,"EXTRN   _DES_SPtrans:DWORD");
62
63	&comment("");
64	&comment("Load the 2 words");
65	&mov("eax",&wparam(0));
66	&mov($L,&DWP(0,"eax","",0));
67	&mov($R,&DWP(4,"eax","",0));
68
69	$ksp=&wparam(1);
70
71	if ($do_ip)
72		{
73		&comment("");
74		&comment("IP");
75		&IP_new($L,$R,"eax");
76		}
77
78	&comment("");
79	&comment("fixup rotate");
80	&rotl($R,3);
81	&rotl($L,3);
82	&exch($L,$R);
83
84	&comment("");
85	&comment("load counter, key_schedule and enc flag");
86	&mov("eax",&wparam(2));	# get encrypt flag
87	&mov("ebp",&wparam(1));	# get ks
88	&cmp("eax","0");
89	&je(&label("start_decrypt"));
90
91	# encrypting part
92
93	for ($i=0; $i<16; $i+=2)
94		{
95		&comment("");
96		&comment("Round $i");
97		&D_ENCRYPT($L,$R,$i*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx");
98
99		&comment("");
100		&comment("Round ".sprintf("%d",$i+1));
101		&D_ENCRYPT($R,$L,($i+1)*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx");
102		}
103	&jmp(&label("end"));
104
105	&set_label("start_decrypt");
106
107	for ($i=15; $i>0; $i-=2)
108		{
109		&comment("");
110		&comment("Round $i");
111		&D_ENCRYPT($L,$R,$i*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx");
112		&comment("");
113		&comment("Round ".sprintf("%d",$i-1));
114		&D_ENCRYPT($R,$L,($i-1)*2,"ebp","DES_SPtrans","ecx","edx","eax","ebx");
115		}
116
117	&set_label("end");
118
119	&comment("");
120	&comment("Fixup");
121	&rotr($L,3);		# r
122	&rotr($R,3);		# l
123
124	if ($do_ip)
125		{
126		&comment("");
127		&comment("FP");
128		&FP_new($R,$L,"eax");
129		}
130
131	&mov("eax",&wparam(0));
132	&mov(&DWP(0,"eax","",0),$L);
133	&mov(&DWP(4,"eax","",0),$R);
134
135	&function_end($name);
136	}
137
138
139# The logic is to load R into 2 registers and operate on both at the same time.
140# We also load the 2 R's into 2 more registers so we can do the 'move word down a byte'
141# while also masking the other copy and doing a lookup.  We then also accumulate the
142# L value in 2 registers then combine them at the end.
143sub D_ENCRYPT
144	{
145	local($L,$R,$S,$ks,$desSP,$u,$t,$tmp1,$tmp2,$tmp3)=@_;
146
147	&mov(	$u,		&DWP(&n2a($S*4),$ks,"",0));
148	&mov(	$t,		&DWP(&n2a(($S+1)*4),$ks,"",0));
149	&xor(	$u,		$R		);
150	&xor(	$t,		$R		);
151	&rotr(	$t,		4		);
152
153	# the numbers at the end of the line are origional instruction order
154	&mov(	$tmp2,		$u		);			# 1 2
155	&mov(	$tmp1,		$t		);			# 1 1
156	&and(	$tmp2,		"0xfc"		);			# 1 4
157	&and(	$tmp1,		"0xfc"		);			# 1 3
158	&shr(	$t,		8		);			# 1 5
159	&xor(	$L,		&DWP("0x100+$desSP",$tmp1,"",0));	# 1 7
160	&shr(	$u,		8		);			# 1 6
161	&mov(	$tmp1,		&DWP("      $desSP",$tmp2,"",0));	# 1 8
162
163	&mov(	$tmp2,		$u		);			# 2 2
164	&xor(	$L,		$tmp1		);			# 1 9
165	&and(	$tmp2,		"0xfc"		);			# 2 4
166	&mov(	$tmp1,		$t		);			# 2 1
167	&and(	$tmp1,		"0xfc"		);			# 2 3
168	&shr(	$t,		8		);			# 2 5
169	&xor(	$L,		&DWP("0x300+$desSP",$tmp1,"",0));	# 2 7
170	&shr(	$u,		8		);			# 2 6
171	&mov(	$tmp1,		&DWP("0x200+$desSP",$tmp2,"",0));	# 2 8
172	&mov(	$tmp2,		$u		);			# 3 2
173
174	&xor(	$L,		$tmp1		);			# 2 9
175	&and(	$tmp2,		"0xfc"		);			# 3 4
176
177	&mov(	$tmp1,		$t		);			# 3 1
178	&shr(	$u,		8		);			# 3 6
179	&and(	$tmp1,		"0xfc"		);			# 3 3
180	&shr(	$t,		8		);			# 3 5
181	&xor(	$L,		&DWP("0x500+$desSP",$tmp1,"",0));	# 3 7
182	&mov(	$tmp1,		&DWP("0x400+$desSP",$tmp2,"",0));	# 3 8
183
184	&and(	$t,		"0xfc"		);			# 4 1
185	&xor(	$L,		$tmp1		);			# 3 9
186
187	&and(	$u,		"0xfc"		);			# 4 2
188	&xor(	$L,		&DWP("0x700+$desSP",$t,"",0));		# 4 3
189	&xor(	$L,		&DWP("0x600+$desSP",$u,"",0));		# 4 4
190	}
191
192sub PERM_OP
193	{
194	local($a,$b,$tt,$shift,$mask)=@_;
195
196	&mov(	$tt,		$a		);
197	&shr(	$tt,		$shift		);
198	&xor(	$tt,		$b		);
199	&and(	$tt,		$mask		);
200	&xor(	$b,		$tt		);
201	&shl(	$tt,		$shift		);
202	&xor(	$a,		$tt		);
203	}
204
205sub IP_new
206	{
207	local($l,$r,$tt)=@_;
208
209	&PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");
210	&PERM_OP($l,$r,$tt,16,"0x0000ffff");
211	&PERM_OP($r,$l,$tt, 2,"0x33333333");
212	&PERM_OP($l,$r,$tt, 8,"0x00ff00ff");
213	&PERM_OP($r,$l,$tt, 1,"0x55555555");
214	}
215
216sub FP_new
217	{
218	local($l,$r,$tt)=@_;
219
220	&PERM_OP($l,$r,$tt, 1,"0x55555555");
221        &PERM_OP($r,$l,$tt, 8,"0x00ff00ff");
222        &PERM_OP($l,$r,$tt, 2,"0x33333333");
223        &PERM_OP($r,$l,$tt,16,"0x0000ffff");
224        &PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");
225	}
226
227sub n2a
228	{
229	sprintf("%d",$_[0]);
230	}
231