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[strongswan.git] / src / libfreeswan / libcrypto / oldlibdes / des / asm / des-586.pl
1 #!/usr/bin/perl
2 #
3 # The inner loop instruction sequence and the IP/FP modifications are from
4 # Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk>
5 #
6
7 push(@INC,"perlasm","../../perlasm");
8 require "x86asm.pl";
9 require "cbc.pl";
10 require "desboth.pl";
11
12 # base code is in microsft
13 # op dest, source
14 # format.
15 #
16
17 &asm_init($ARGV[0],"des-586.pl");
18
19 $L="edi";
20 $R="esi";
21
22 &external_label("des_SPtrans");
23 &des_encrypt("des_encrypt",1);
24 &des_encrypt("des_encrypt2",0);
25 &des_encrypt3("des_encrypt3",1);
26 &des_encrypt3("des_decrypt3",0);
27 &cbc("des_ncbc_encrypt","des_encrypt","des_encrypt",0,4,5,3,5,-1);
28 &cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",0,6,7,3,4,5);
29
30 &asm_finish();
31
32 sub des_encrypt
33 {
34 local($name,$do_ip)=@_;
35
36 &function_begin_B($name,"EXTRN _des_SPtrans:DWORD");
37
38 &push("esi");
39 &push("edi");
40
41 &comment("");
42 &comment("Load the 2 words");
43 $ks="ebp";
44
45 if ($do_ip)
46 {
47 &mov($R,&wparam(0));
48 &xor( "ecx", "ecx" );
49
50 &push("ebx");
51 &push("ebp");
52
53 &mov("eax",&DWP(0,$R,"",0));
54 &mov("ebx",&wparam(2)); # get encrypt flag
55 &mov($L,&DWP(4,$R,"",0));
56 &comment("");
57 &comment("IP");
58 &IP_new("eax",$L,$R,3);
59 }
60 else
61 {
62 &mov("eax",&wparam(0));
63 &xor( "ecx", "ecx" );
64
65 &push("ebx");
66 &push("ebp");
67
68 &mov($R,&DWP(0,"eax","",0));
69 &mov("ebx",&wparam(2)); # get encrypt flag
70 &rotl($R,3);
71 &mov($L,&DWP(4,"eax","",0));
72 &rotl($L,3);
73 }
74
75 &mov( $ks, &wparam(1) );
76 &cmp("ebx","0");
77 &je(&label("start_decrypt"));
78
79 for ($i=0; $i<16; $i+=2)
80 {
81 &comment("");
82 &comment("Round $i");
83 &D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
84
85 &comment("");
86 &comment("Round ".sprintf("%d",$i+1));
87 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
88 }
89 &jmp(&label("end"));
90
91 &set_label("start_decrypt");
92
93 for ($i=15; $i>0; $i-=2)
94 {
95 &comment("");
96 &comment("Round $i");
97 &D_ENCRYPT(15-$i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
98 &comment("");
99 &comment("Round ".sprintf("%d",$i-1));
100 &D_ENCRYPT(15-$i+1,$R,$L,($i-1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
101 }
102
103 &set_label("end");
104
105 if ($do_ip)
106 {
107 &comment("");
108 &comment("FP");
109 &mov("edx",&wparam(0));
110 &FP_new($L,$R,"eax",3);
111
112 &mov(&DWP(0,"edx","",0),"eax");
113 &mov(&DWP(4,"edx","",0),$R);
114 }
115 else
116 {
117 &comment("");
118 &comment("Fixup");
119 &rotr($L,3); # r
120 &mov("eax",&wparam(0));
121 &rotr($R,3); # l
122 &mov(&DWP(0,"eax","",0),$L);
123 &mov(&DWP(4,"eax","",0),$R);
124 }
125
126 &pop("ebp");
127 &pop("ebx");
128 &pop("edi");
129 &pop("esi");
130 &ret();
131
132 &function_end_B($name);
133 }
134
135 sub D_ENCRYPT
136 {
137 local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
138
139 &mov( $u, &DWP(&n2a($S*4),$ks,"",0));
140 &xor( $tmp1, $tmp1);
141 &mov( $t, &DWP(&n2a(($S+1)*4),$ks,"",0));
142 &xor( $u, $R);
143 &xor( $t, $R);
144 &and( $u, "0xfcfcfcfc" );
145 &and( $t, "0xcfcfcfcf" );
146 &movb( &LB($tmp1), &LB($u) );
147 &movb( &LB($tmp2), &HB($u) );
148 &rotr( $t, 4 );
149 &mov( $ks, &DWP(" $desSP",$tmp1,"",0));
150 &movb( &LB($tmp1), &LB($t) );
151 &xor( $L, $ks);
152 &mov( $ks, &DWP("0x200+$desSP",$tmp2,"",0));
153 &xor( $L, $ks); ######
154 &movb( &LB($tmp2), &HB($t) );
155 &shr( $u, 16);
156 &mov( $ks, &DWP("0x100+$desSP",$tmp1,"",0));
157 &xor( $L, $ks); ######
158 &movb( &LB($tmp1), &HB($u) );
159 &shr( $t, 16);
160 &mov( $ks, &DWP("0x300+$desSP",$tmp2,"",0));
161 &xor( $L, $ks);
162 &mov( $ks, &wparam(1) );
163 &movb( &LB($tmp2), &HB($t) );
164 &and( $u, "0xff" );
165 &and( $t, "0xff" );
166 &mov( $tmp1, &DWP("0x600+$desSP",$tmp1,"",0));
167 &xor( $L, $tmp1);
168 &mov( $tmp1, &DWP("0x700+$desSP",$tmp2,"",0));
169 &xor( $L, $tmp1);
170 &mov( $tmp1, &DWP("0x400+$desSP",$u,"",0));
171 &xor( $L, $tmp1);
172 &mov( $tmp1, &DWP("0x500+$desSP",$t,"",0));
173 &xor( $L, $tmp1);
174 }
175
176 sub n2a
177 {
178 sprintf("%d",$_[0]);
179 }
180
181 # now has a side affect of rotating $a by $shift
182 sub R_PERM_OP
183 {
184 local($a,$b,$tt,$shift,$mask,$last)=@_;
185
186 &rotl( $a, $shift ) if ($shift != 0);
187 &mov( $tt, $a );
188 &xor( $a, $b );
189 &and( $a, $mask );
190 if (!$last eq $b)
191 {
192 &xor( $b, $a );
193 &xor( $tt, $a );
194 }
195 else
196 {
197 &xor( $tt, $a );
198 &xor( $b, $a );
199 }
200 &comment("");
201 }
202
203 sub IP_new
204 {
205 local($l,$r,$tt,$lr)=@_;
206
207 &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
208 &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
209 &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
210 &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
211 &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
212
213 if ($lr != 3)
214 {
215 if (($lr-3) < 0)
216 { &rotr($tt, 3-$lr); }
217 else { &rotl($tt, $lr-3); }
218 }
219 if ($lr != 2)
220 {
221 if (($lr-2) < 0)
222 { &rotr($r, 2-$lr); }
223 else { &rotl($r, $lr-2); }
224 }
225 }
226
227 sub FP_new
228 {
229 local($l,$r,$tt,$lr)=@_;
230
231 if ($lr != 2)
232 {
233 if (($lr-2) < 0)
234 { &rotl($r, 2-$lr); }
235 else { &rotr($r, $lr-2); }
236 }
237 if ($lr != 3)
238 {
239 if (($lr-3) < 0)
240 { &rotl($l, 3-$lr); }
241 else { &rotr($l, $lr-3); }
242 }
243
244 &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
245 &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
246 &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
247 &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
248 &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
249 &rotr($tt , 4);
250 }
251