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[strongswan.git] / src / libfreeswan / libcrypto / oldlibdes / des / asm / crypt586.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 # I've added the stuff needed for crypt() but I've not worried about making
6 # things perfect.
7 #
8
9 push(@INC,"perlasm","../../perlasm");
10 require "x86asm.pl";
11
12 &asm_init($ARGV[0],"crypt586.pl");
13
14 $L="edi";
15 $R="esi";
16
17 &external_label("des_SPtrans");
18 &fcrypt_body("fcrypt_body");
19 &asm_finish();
20
21 sub fcrypt_body
22 {
23 local($name,$do_ip)=@_;
24
25 &function_begin($name,"EXTRN _des_SPtrans:DWORD");
26
27 &comment("");
28 &comment("Load the 2 words");
29 $ks="ebp";
30
31 &xor( $L, $L);
32 &xor( $R, $R);
33 &mov($ks,&wparam(1));
34
35 &push(25); # add a variable
36
37 &set_label("start");
38 for ($i=0; $i<16; $i+=2)
39 {
40 &comment("");
41 &comment("Round $i");
42 &D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
43
44 &comment("");
45 &comment("Round ".sprintf("%d",$i+1));
46 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
47 }
48 &mov("ebx", &swtmp(0));
49 &mov("eax", $L);
50 &dec("ebx");
51 &mov($L, $R);
52 &mov($R, "eax");
53 &mov(&swtmp(0), "ebx");
54 &jnz(&label("start"));
55
56 &comment("");
57 &comment("FP");
58 &mov("edx",&wparam(0));
59
60 &FP_new($R,$L,"eax",3);
61 &mov(&DWP(0,"edx","",0),"eax");
62 &mov(&DWP(4,"edx","",0),$L);
63
64 &pop("ecx"); # remove variable
65
66 &function_end($name);
67 }
68
69 sub D_ENCRYPT
70 {
71 local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
72
73 &mov( $u, &wparam(2)); # 2
74 &mov( $t, $R);
75 &shr( $t, 16); # 1
76 &mov( $tmp2, &wparam(3)); # 2
77 &xor( $t, $R); # 1
78
79 &and( $u, $t); # 2
80 &and( $t, $tmp2); # 2
81
82 &mov( $tmp1, $u);
83 &shl( $tmp1, 16); # 1
84 &mov( $tmp2, $t);
85 &shl( $tmp2, 16); # 1
86 &xor( $u, $tmp1); # 2
87 &xor( $t, $tmp2); # 2
88 &mov( $tmp1, &DWP(&n2a($S*4),$ks,"",0)); # 2
89 &xor( $u, $tmp1);
90 &mov( $tmp2, &DWP(&n2a(($S+1)*4),$ks,"",0)); # 2
91 &xor( $u, $R);
92 &xor( $t, $R);
93 &xor( $t, $tmp2);
94
95 &and( $u, "0xfcfcfcfc" ); # 2
96 &xor( $tmp1, $tmp1); # 1
97 &and( $t, "0xcfcfcfcf" ); # 2
98 &xor( $tmp2, $tmp2);
99 &movb( &LB($tmp1), &LB($u) );
100 &movb( &LB($tmp2), &HB($u) );
101 &rotr( $t, 4 );
102 &mov( $ks, &DWP(" $desSP",$tmp1,"",0));
103 &movb( &LB($tmp1), &LB($t) );
104 &xor( $L, $ks);
105 &mov( $ks, &DWP("0x200+$desSP",$tmp2,"",0));
106 &xor( $L, $ks);
107 &movb( &LB($tmp2), &HB($t) );
108 &shr( $u, 16);
109 &mov( $ks, &DWP("0x100+$desSP",$tmp1,"",0));
110 &xor( $L, $ks);
111 &movb( &LB($tmp1), &HB($u) );
112 &shr( $t, 16);
113 &mov( $ks, &DWP("0x300+$desSP",$tmp2,"",0));
114 &xor( $L, $ks);
115 &mov( $ks, &wparam(1));
116 &movb( &LB($tmp2), &HB($t) );
117 &and( $u, "0xff" );
118 &and( $t, "0xff" );
119 &mov( $tmp1, &DWP("0x600+$desSP",$tmp1,"",0));
120 &xor( $L, $tmp1);
121 &mov( $tmp1, &DWP("0x700+$desSP",$tmp2,"",0));
122 &xor( $L, $tmp1);
123 &mov( $tmp1, &DWP("0x400+$desSP",$u,"",0));
124 &xor( $L, $tmp1);
125 &mov( $tmp1, &DWP("0x500+$desSP",$t,"",0));
126 &xor( $L, $tmp1);
127 }
128
129 sub n2a
130 {
131 sprintf("%d",$_[0]);
132 }
133
134 # now has a side affect of rotating $a by $shift
135 sub R_PERM_OP
136 {
137 local($a,$b,$tt,$shift,$mask,$last)=@_;
138
139 &rotl( $a, $shift ) if ($shift != 0);
140 &mov( $tt, $a );
141 &xor( $a, $b );
142 &and( $a, $mask );
143 if ($notlast eq $b)
144 {
145 &xor( $b, $a );
146 &xor( $tt, $a );
147 }
148 else
149 {
150 &xor( $tt, $a );
151 &xor( $b, $a );
152 }
153 &comment("");
154 }
155
156 sub IP_new
157 {
158 local($l,$r,$tt,$lr)=@_;
159
160 &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
161 &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
162 &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
163 &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
164 &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
165
166 if ($lr != 3)
167 {
168 if (($lr-3) < 0)
169 { &rotr($tt, 3-$lr); }
170 else { &rotl($tt, $lr-3); }
171 }
172 if ($lr != 2)
173 {
174 if (($lr-2) < 0)
175 { &rotr($r, 2-$lr); }
176 else { &rotl($r, $lr-2); }
177 }
178 }
179
180 sub FP_new
181 {
182 local($l,$r,$tt,$lr)=@_;
183
184 if ($lr != 2)
185 {
186 if (($lr-2) < 0)
187 { &rotl($r, 2-$lr); }
188 else { &rotr($r, $lr-2); }
189 }
190 if ($lr != 3)
191 {
192 if (($lr-3) < 0)
193 { &rotl($l, 3-$lr); }
194 else { &rotr($l, $lr-3); }
195 }
196
197 &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
198 &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
199 &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
200 &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
201 &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
202 &rotr($tt , 4);
203 }
204