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[strongswan.git] / src / libfreeswan / libcrypto / libdes / asm / des686.pl
1 #!/usr/bin/perl
2
3 $prog="des686.pl";
4
5 # base code is in microsft
6 # op dest, source
7 # format.
8 #
9
10 # WILL NOT WORK ANYMORE WITH desboth.pl
11 require "desboth.pl";
12
13 if ( ($ARGV[0] eq "elf"))
14 { require "x86unix.pl"; }
15 elsif ( ($ARGV[0] eq "a.out"))
16 { $aout=1; require "x86unix.pl"; }
17 elsif ( ($ARGV[0] eq "sol"))
18 { $sol=1; require "x86unix.pl"; }
19 elsif ( ($ARGV[0] eq "cpp"))
20 { $cpp=1; require "x86unix.pl"; }
21 elsif ( ($ARGV[0] eq "win32"))
22 { require "x86ms.pl"; }
23 else
24 {
25 print STDERR <<"EOF";
26 Pick 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
32 EOF
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 $R="esi";
48
49 &des_encrypt("des_encrypt",1);
50 &des_encrypt("des_encrypt2",0);
51
52 &des_encrypt3("des_encrypt3",1);
53 &des_encrypt3("des_decrypt3",0);
54
55 &file_end();
56
57 sub des_encrypt
58 {
59 local($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.
143 sub 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",$u,"",0)); # 4 4
190 }
191
192 sub PERM_OP
193 {
194 local($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, $tt );
203 }
204
205 sub IP_new
206 {
207 local($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,$tt, 1,"0x55555555");
214 }
215
216 sub FP_new
217 {
218 local($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,$tt, 4,"0x0f0f0f0f");
225 }
226
227 sub n2a
228 {
229 sprintf("%d",$_[0]);
230 }