Update perl asm scripts include paths for perlasm.
[openssl.git] / crypto / des / asm / crypt586.pl
1 #!/usr/local/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 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
10 push(@INC,"${dir}","${dir}../../perlasm");
11 require "x86asm.pl";
12
13 &asm_init($ARGV[0],"crypt586.pl");
14
15 $L="edi";
16 $R="esi";
17
18 &external_label("DES_SPtrans");
19 &fcrypt_body("fcrypt_body");
20 &asm_finish();
21
22 sub fcrypt_body
23         {
24         local($name,$do_ip)=@_;
25
26         &function_begin($name);
27
28         &comment("");
29         &comment("Load the 2 words");
30         $trans="ebp";
31
32         &xor(   $L,     $L);
33         &xor(   $R,     $R);
34
35         # PIC-ification:-)
36         &picmeup("edx","DES_SPtrans");
37         #if ($cpp)      { &picmeup("edx","DES_SPtrans");   }
38         #else           { &lea("edx",&DWP("DES_SPtrans")); }
39         &push("edx");   # becomes &swtmp(1)
40         #
41         &mov($trans,&wparam(1)); # reloaded with DES_SPtrans in D_ENCRYPT
42
43         &push(&DWC(25)); # add a variable
44
45         &set_label("start");
46         for ($i=0; $i<16; $i+=2)
47                 {
48                 &comment("");
49                 &comment("Round $i");
50                 &D_ENCRYPT($i,$L,$R,$i*2,$trans,"eax","ebx","ecx","edx");
51
52                 &comment("");
53                 &comment("Round ".sprintf("%d",$i+1));
54                 &D_ENCRYPT($i+1,$R,$L,($i+1)*2,$trans,"eax","ebx","ecx","edx");
55                 }
56          &mov("ebx",    &swtmp(0));
57         &mov("eax",     $L);
58          &dec("ebx");
59         &mov($L,        $R);
60          &mov($R,       "eax");
61         &mov(&swtmp(0), "ebx");
62          &jnz(&label("start"));
63
64         &comment("");
65         &comment("FP");
66         &mov("edx",&wparam(0));
67
68         &FP_new($R,$L,"eax",3);
69         &mov(&DWP(0,"edx","",0),"eax");
70         &mov(&DWP(4,"edx","",0),$L);
71
72         &add("esp",8);  # remove variables
73
74         &function_end($name);
75         }
76
77 sub D_ENCRYPT
78         {
79         local($r,$L,$R,$S,$trans,$u,$tmp1,$tmp2,$t)=@_;
80
81         &mov(   $u,             &wparam(2));                    # 2
82         &mov(   $t,             $R);
83         &shr(   $t,             16);                            # 1
84         &mov(   $tmp2,          &wparam(3));                    # 2
85         &xor(   $t,             $R);                            # 1
86
87         &and(   $u,             $t);                            # 2
88         &and(   $t,             $tmp2);                         # 2
89
90         &mov(   $tmp1,          $u);
91         &shl(   $tmp1,          16);                            # 1
92         &mov(   $tmp2,          $t);
93         &shl(   $tmp2,          16);                            # 1
94         &xor(   $u,             $tmp1);                         # 2
95         &xor(   $t,             $tmp2);                         # 2
96         &mov(   $tmp1,          &DWP(&n2a($S*4),$trans,"",0));  # 2
97         &xor(   $u,             $tmp1);
98         &mov(   $tmp2,          &DWP(&n2a(($S+1)*4),$trans,"",0));      # 2
99         &xor(   $u,             $R);
100         &xor(   $t,             $R);
101         &xor(   $t,             $tmp2);
102
103         &and(   $u,             "0xfcfcfcfc"    );              # 2
104         &xor(   $tmp1,          $tmp1);                         # 1
105         &and(   $t,             "0xcfcfcfcf"    );              # 2
106         &xor(   $tmp2,          $tmp2); 
107         &movb(  &LB($tmp1),     &LB($u) );
108         &movb(  &LB($tmp2),     &HB($u) );
109         &rotr(  $t,             4               );
110         &mov(   $trans,         &swtmp(1));
111         &xor(   $L,             &DWP("     ",$trans,$tmp1,0));
112         &movb(  &LB($tmp1),     &LB($t) );
113         &xor(   $L,             &DWP("0x200",$trans,$tmp2,0));
114         &movb(  &LB($tmp2),     &HB($t) );
115         &shr(   $u,             16);
116         &xor(   $L,             &DWP("0x100",$trans,$tmp1,0));
117         &movb(  &LB($tmp1),     &HB($u) );
118         &shr(   $t,             16);
119         &xor(   $L,             &DWP("0x300",$trans,$tmp2,0));
120         &movb(  &LB($tmp2),     &HB($t) );
121         &and(   $u,             "0xff"  );
122         &and(   $t,             "0xff"  );
123         &mov(   $tmp1,          &DWP("0x600",$trans,$tmp1,0));
124         &xor(   $L,             $tmp1);
125         &mov(   $tmp1,          &DWP("0x700",$trans,$tmp2,0));
126         &xor(   $L,             $tmp1);
127         &mov(   $tmp1,          &DWP("0x400",$trans,$u,0));
128         &xor(   $L,             $tmp1);
129         &mov(   $tmp1,          &DWP("0x500",$trans,$t,0));
130         &xor(   $L,             $tmp1);
131         &mov(   $trans,         &wparam(1));
132         }
133
134 sub n2a
135         {
136         sprintf("%d",$_[0]);
137         }
138
139 # now has a side affect of rotating $a by $shift
140 sub R_PERM_OP
141         {
142         local($a,$b,$tt,$shift,$mask,$last)=@_;
143
144         &rotl(  $a,             $shift          ) if ($shift != 0);
145         &mov(   $tt,            $a              );
146         &xor(   $a,             $b              );
147         &and(   $a,             $mask           );
148         if ($notlast eq $b)
149                 {
150                 &xor(   $b,             $a              );
151                 &xor(   $tt,            $a              );
152                 }
153         else
154                 {
155                 &xor(   $tt,            $a              );
156                 &xor(   $b,             $a              );
157                 }
158         &comment("");
159         }
160
161 sub IP_new
162         {
163         local($l,$r,$tt,$lr)=@_;
164
165         &R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
166         &R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
167         &R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
168         &R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
169         &R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
170         
171         if ($lr != 3)
172                 {
173                 if (($lr-3) < 0)
174                         { &rotr($tt,    3-$lr); }
175                 else    { &rotl($tt,    $lr-3); }
176                 }
177         if ($lr != 2)
178                 {
179                 if (($lr-2) < 0)
180                         { &rotr($r,     2-$lr); }
181                 else    { &rotl($r,     $lr-2); }
182                 }
183         }
184
185 sub FP_new
186         {
187         local($l,$r,$tt,$lr)=@_;
188
189         if ($lr != 2)
190                 {
191                 if (($lr-2) < 0)
192                         { &rotl($r,     2-$lr); }
193                 else    { &rotr($r,     $lr-2); }
194                 }
195         if ($lr != 3)
196                 {
197                 if (($lr-3) < 0)
198                         { &rotl($l,     3-$lr); }
199                 else    { &rotr($l,     $lr-3); }
200                 }
201
202         &R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
203         &R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
204         &R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
205         &R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
206         &R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
207         &rotr($tt       , 4);
208         }
209