1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
#!/usr/local/bin/perl
$prog="des686.pl";
# base code is in microsft
# op dest, source
# format.
#
# WILL NOT WORK ANYMORE WITH desboth.pl
require "desboth.pl";
if ( ($ARGV[0] eq "elf"))
{ require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "a.out"))
{ $aout=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "sol"))
{ $sol=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "cpp"))
{ $cpp=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "win32"))
{ require "x86ms.pl"; }
else
{
print STDERR <<"EOF";
Pick one target type from
elf - linux, FreeBSD etc
a.out - old linux
sol - x86 solaris
cpp - format so x86unix.cpp can be used
win32 - Windows 95/Windows NT
EOF
exit(1);
}
&comment("Don't even think of reading this code");
&comment("It was automatically generated by $prog");
&comment("Which is a perl program used to generate the x86 assember for");
&comment("any of elf, a.out, Win32, or Solaris");
&comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+");
&comment("eric <eay\@cryptsoft.com>");
&comment("");
&file("dx86xxxx");
$L="edi";
$R="esi";
&des_encrypt("des_encrypt",1);
&des_encrypt("des_encrypt2",0);
&des_encrypt3("des_encrypt3",1);
&des_encrypt3("des_decrypt3",0);
&file_end();
sub des_encrypt
{
local($name,$do_ip)=@_;
&function_begin($name,"EXTRN _des_SPtrans:DWORD");
&comment("");
&comment("Load the 2 words");
&mov("eax",&wparam(0));
&mov($L,&DWP(0,"eax","",0));
&mov($R,&DWP(4,"eax","",0));
$ksp=&wparam(1);
if ($do_ip)
{
&comment("");
&comment("IP");
&IP_new($L,$R,"eax");
}
&comment("");
&comment("fixup rotate");
&rotl($R,3);
&rotl($L,3);
&exch($L,$R);
&comment("");
&comment("load counter, key_schedule and enc flag");
&mov("eax",&wparam(2)); # get encrypt flag
&mov("ebp",&wparam(1)); # get ks
&cmp("eax","0");
&je(&label("start_decrypt"));
# encrypting part
for ($i=0; $i<16; $i+=2)
{
&comment("");
&comment("Round $i");
&D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
&comment("");
&comment("Round ".sprintf("%d",$i+1));
&D_ENCRYPT($R,$L,($i+1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
}
&jmp(&label("end"));
&set_label("start_decrypt");
for ($i=15; $i>0; $i-=2)
{
&comment("");
&comment("Round $i");
&D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
&comment("");
&comment("Round ".sprintf("%d",$i-1));
&D_ENCRYPT($R,$L,($i-1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
}
&set_label("end");
&comment("");
&comment("Fixup");
&rotr($L,3); # r
&rotr($R,3); # l
if ($do_ip)
{
&comment("");
&comment("FP");
&FP_new($R,$L,"eax");
}
&mov("eax",&wparam(0));
&mov(&DWP(0,"eax","",0),$L);
&mov(&DWP(4,"eax","",0),$R);
&function_end($name);
}
# The logic is to load R into 2 registers and operate on both at the same time.
# We also load the 2 R's into 2 more registers so we can do the 'move word down a byte'
# while also masking the other copy and doing a lookup. We then also accumulate the
# L value in 2 registers then combine them at the end.
sub D_ENCRYPT
{
local($L,$R,$S,$ks,$desSP,$u,$t,$tmp1,$tmp2,$tmp3)=@_;
&mov( $u, &DWP(&n2a($S*4),$ks,"",0));
&mov( $t, &DWP(&n2a(($S+1)*4),$ks,"",0));
&xor( $u, $R );
&xor( $t, $R );
&rotr( $t, 4 );
# the numbers at the end of the line are origional instruction order
&mov( $tmp2, $u ); # 1 2
&mov( $tmp1, $t ); # 1 1
&and( $tmp2, "0xfc" ); # 1 4
&and( $tmp1, "0xfc" ); # 1 3
&shr( $t, 8 ); # 1 5
&xor( $L, &DWP("0x100+$desSP",$tmp1,"",0)); # 1 7
&shr( $u, 8 ); # 1 6
&mov( $tmp1, &DWP(" $desSP",$tmp2,"",0)); # 1 8
&mov( $tmp2, $u ); # 2 2
&xor( $L, $tmp1 ); # 1 9
&and( $tmp2, "0xfc" ); # 2 4
&mov( $tmp1, $t ); # 2 1
&and( $tmp1, "0xfc" ); # 2 3
&shr( $t, 8 ); # 2 5
&xor( $L, &DWP("0x300+$desSP",$tmp1,"",0)); # 2 7
&shr( $u, 8 ); # 2 6
&mov( $tmp1, &DWP("0x200+$desSP",$tmp2,"",0)); # 2 8
&mov( $tmp2, $u ); # 3 2
&xor( $L, $tmp1 ); # 2 9
&and( $tmp2, "0xfc" ); # 3 4
&mov( $tmp1, $t ); # 3 1
&shr( $u, 8 ); # 3 6
&and( $tmp1, "0xfc" ); # 3 3
&shr( $t, 8 ); # 3 5
&xor( $L, &DWP("0x500+$desSP",$tmp1,"",0)); # 3 7
&mov( $tmp1, &DWP("0x400+$desSP",$tmp2,"",0)); # 3 8
&and( $t, "0xfc" ); # 4 1
&xor( $L, $tmp1 ); # 3 9
&and( $u, "0xfc" ); # 4 2
&xor( $L, &DWP("0x700+$desSP",$t,"",0)); # 4 3
&xor( $L, &DWP("0x600+$desSP",$u,"",0)); # 4 4
}
sub PERM_OP
{
local($a,$b,$tt,$shift,$mask)=@_;
&mov( $tt, $a );
&shr( $tt, $shift );
&xor( $tt, $b );
&and( $tt, $mask );
&xor( $b, $tt );
&shl( $tt, $shift );
&xor( $a, $tt );
}
sub IP_new
{
local($l,$r,$tt)=@_;
&PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");
&PERM_OP($l,$r,$tt,16,"0x0000ffff");
&PERM_OP($r,$l,$tt, 2,"0x33333333");
&PERM_OP($l,$r,$tt, 8,"0x00ff00ff");
&PERM_OP($r,$l,$tt, 1,"0x55555555");
}
sub FP_new
{
local($l,$r,$tt)=@_;
&PERM_OP($l,$r,$tt, 1,"0x55555555");
&PERM_OP($r,$l,$tt, 8,"0x00ff00ff");
&PERM_OP($l,$r,$tt, 2,"0x33333333");
&PERM_OP($r,$l,$tt,16,"0x0000ffff");
&PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");
}
sub n2a
{
sprintf("%d",$_[0]);
}
|
