Mitigate the hazard of cache-collision timing attack on last round. Well,
[openssl.git] / crypto / aes / asm / aes-586.pl
1 #!/usr/bin/env perl
2 #
3 # ====================================================================
4 # Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
5 # project. Rights for redistribution and usage in source and binary
6 # forms are granted according to the OpenSSL license.
7 # ====================================================================
8 #
9 # Version 3.6.
10 #
11 # You might fail to appreciate this module performance from the first
12 # try. If compared to "vanilla" linux-ia32-icc target, i.e. considered
13 # to be *the* best Intel C compiler without -KPIC, performance appears
14 # to be virtually identical... But try to re-configure with shared
15 # library support... Aha! Intel compiler "suddenly" lags behind by 30%
16 # [on P4, more on others]:-) And if compared to position-independent
17 # code generated by GNU C, this code performs *more* than *twice* as
18 # fast! Yes, all this buzz about PIC means that unlike other hand-
19 # coded implementations, this one was explicitly designed to be safe
20 # to use even in shared library context... This also means that this
21 # code isn't necessarily absolutely fastest "ever," because in order
22 # to achieve position independence an extra register has to be
23 # off-loaded to stack, which affects the benchmark result.
24 #
25 # Special note about instruction choice. Do you recall RC4_INT code
26 # performing poorly on P4? It might be the time to figure out why.
27 # RC4_INT code implies effective address calculations in base+offset*4
28 # form. Trouble is that it seems that offset scaling turned to be
29 # critical path... At least eliminating scaling resulted in 2.8x RC4
30 # performance improvement [as you might recall]. As AES code is hungry
31 # for scaling too, I [try to] avoid the latter by favoring off-by-2
32 # shifts and masking the result with 0xFF<<2 instead of "boring" 0xFF.
33 #
34 # As was shown by Dean Gaudet <dean@arctic.org>, the above note turned
35 # void. Performance improvement with off-by-2 shifts was observed on
36 # intermediate implementation, which was spilling yet another register
37 # to stack... Final offset*4 code below runs just a tad faster on P4,
38 # but exhibits up to 10% improvement on other cores.
39 #
40 # Second version is "monolithic" replacement for aes_core.c, which in
41 # addition to AES_[de|en]crypt implements AES_set_[de|en]cryption_key.
42 # This made it possible to implement little-endian variant of the
43 # algorithm without modifying the base C code. Motivating factor for
44 # the undertaken effort was that it appeared that in tight IA-32
45 # register window little-endian flavor could achieve slightly higher
46 # Instruction Level Parallelism, and it indeed resulted in up to 15%
47 # better performance on most recent µ-archs...
48 #
49 # Third version adds AES_cbc_encrypt implementation, which resulted in
50 # up to 40% performance imrovement of CBC benchmark results. 40% was
51 # observed on P4 core, where "overall" imrovement coefficient, i.e. if
52 # compared to PIC generated by GCC and in CBC mode, was observed to be
53 # as large as 4x:-) CBC performance is virtually identical to ECB now
54 # and on some platforms even better, e.g. 17.6 "small" cycles/byte on
55 # Opteron, because certain function prologues and epilogues are
56 # effectively taken out of the loop...
57 #
58 # Version 3.2 implements compressed tables and prefetch of these tables
59 # in CBC[!] mode. Former means that 3/4 of table references are now
60 # misaligned, which unfortunately has negative impact on elder IA-32
61 # implementations, Pentium suffered 30% penalty, PIII - 10%.
62 #
63 # Version 3.3 avoids L1 cache aliasing between stack frame and
64 # S-boxes, and 3.4 - L1 cache aliasing even between key schedule. The
65 # latter is achieved by copying the key schedule to controlled place in
66 # stack. This unfortunately has rather strong impact on small block CBC
67 # performance, ~2x deterioration on 16-byte block if compared to 3.3.
68 #
69 # Version 3.5 checks if there is L1 cache aliasing between user-supplied
70 # key schedule and S-boxes and abstains from copying the former if
71 # there is no. This allows end-user to consciously retain small block
72 # performance by aligning key schedule in specific manner.
73 #
74 # Version 3.6 compresses Td4 to 256 bytes and prefetches it in ECB.
75 #
76 # Current ECB performance numbers for 128-bit key in CPU cycles per
77 # processed byte [measure commonly used by AES benchmarkers] are:
78 #
79 #               small footprint         fully unrolled
80 # P4            24                      22
81 # AMD K8        20                      19
82 # PIII          25                      23
83 # Pentium       81                      78
84
85 push(@INC,"perlasm","../../perlasm");
86 require "x86asm.pl";
87
88 &asm_init($ARGV[0],"aes-586.pl",$ARGV[$#ARGV] eq "386");
89
90 $s0="eax";
91 $s1="ebx";
92 $s2="ecx";
93 $s3="edx";
94 $key="edi";
95 $acc="esi";
96
97 $compromise=0;          # $compromise=128 abstains from copying key
98                         # schedule to stack when encrypting inputs
99                         # shorter than 128 bytes at the cost of
100                         # risksing aliasing with S-boxes. In return
101                         # you get way better, up to +70%, small block
102                         # performance.
103 $small_footprint=1;     # $small_footprint=1 code is ~5% slower [on
104                         # recent µ-archs], but ~5 times smaller!
105                         # I favor compact code to minimize cache
106                         # contention and in hope to "collect" 5% back
107                         # in real-life applications...
108 $vertical_spin=0;       # shift "verticaly" defaults to 0, because of
109                         # its proof-of-concept status...
110
111 # Note that there is no decvert(), as well as last encryption round is
112 # performed with "horizontal" shifts. This is because this "vertical"
113 # implementation [one which groups shifts on a given $s[i] to form a
114 # "column," unlike "horizontal" one, which groups shifts on different
115 # $s[i] to form a "row"] is work in progress. It was observed to run
116 # few percents faster on Intel cores, but not AMD. On AMD K8 core it's
117 # whole 12% slower:-( So we face a trade-off... Shall it be resolved
118 # some day? Till then the code is considered experimental and by
119 # default remains dormant...
120
121 sub encvert()
122 { my ($te,@s) = @_;
123   my $v0 = $acc, $v1 = $key;
124
125         &mov    ($v0,$s[3]);                            # copy s3
126         &mov    (&DWP(4,"esp"),$s[2]);                  # save s2
127         &mov    ($v1,$s[0]);                            # copy s0
128         &mov    (&DWP(8,"esp"),$s[1]);                  # save s1
129
130         &movz   ($s[2],&HB($s[0]));
131         &and    ($s[0],0xFF);
132         &mov    ($s[0],&DWP(0,$te,$s[0],8));            # s0>>0
133         &shr    ($v1,16);
134         &mov    ($s[3],&DWP(3,$te,$s[2],8));            # s0>>8
135         &movz   ($s[1],&HB($v1));
136         &and    ($v1,0xFF);
137         &mov    ($s[2],&DWP(2,$te,$v1,8));              # s0>>16
138          &mov   ($v1,$v0);
139         &mov    ($s[1],&DWP(1,$te,$s[1],8));            # s0>>24
140
141         &and    ($v0,0xFF);
142         &xor    ($s[3],&DWP(0,$te,$v0,8));              # s3>>0
143         &movz   ($v0,&HB($v1));
144         &shr    ($v1,16);
145         &xor    ($s[2],&DWP(3,$te,$v0,8));              # s3>>8
146         &movz   ($v0,&HB($v1));
147         &and    ($v1,0xFF);
148         &xor    ($s[1],&DWP(2,$te,$v1,8));              # s3>>16
149          &mov   ($v1,&DWP(4,"esp"));                    # restore s2
150         &xor    ($s[0],&DWP(1,$te,$v0,8));              # s3>>24
151
152         &mov    ($v0,$v1);
153         &and    ($v1,0xFF);
154         &xor    ($s[2],&DWP(0,$te,$v1,8));              # s2>>0
155         &movz   ($v1,&HB($v0));
156         &shr    ($v0,16);
157         &xor    ($s[1],&DWP(3,$te,$v1,8));              # s2>>8
158         &movz   ($v1,&HB($v0));
159         &and    ($v0,0xFF);
160         &xor    ($s[0],&DWP(2,$te,$v0,8));              # s2>>16
161          &mov   ($v0,&DWP(8,"esp"));                    # restore s1
162         &xor    ($s[3],&DWP(1,$te,$v1,8));              # s2>>24
163
164         &mov    ($v1,$v0);
165         &and    ($v0,0xFF);
166         &xor    ($s[1],&DWP(0,$te,$v0,8));              # s1>>0
167         &movz   ($v0,&HB($v1));
168         &shr    ($v1,16);
169         &xor    ($s[0],&DWP(3,$te,$v0,8));              # s1>>8
170         &movz   ($v0,&HB($v1));
171         &and    ($v1,0xFF);
172         &xor    ($s[3],&DWP(2,$te,$v1,8));              # s1>>16
173          &mov   ($key,&DWP(12,"esp"));                  # reincarnate v1 as key
174         &xor    ($s[2],&DWP(1,$te,$v0,8));              # s1>>24
175 }
176
177 sub encstep()
178 { my ($i,$te,@s) = @_;
179   my $tmp = $key;
180   my $out = $i==3?$s[0]:$acc;
181
182         # lines marked with #%e?x[i] denote "reordered" instructions...
183         if ($i==3)  {   &mov    ($key,&DWP(12,"esp"));          }##%edx
184         else        {   &mov    ($out,$s[0]);
185                         &and    ($out,0xFF);                    }
186         if ($i==1)  {   &shr    ($s[0],16);                     }#%ebx[1]
187         if ($i==2)  {   &shr    ($s[0],24);                     }#%ecx[2]
188                         &mov    ($out,&DWP(0,$te,$out,8));
189
190         if ($i==3)  {   $tmp=$s[1];                             }##%eax
191                         &movz   ($tmp,&HB($s[1]));
192                         &xor    ($out,&DWP(3,$te,$tmp,8));
193
194         if ($i==3)  {   $tmp=$s[2]; &mov ($s[1],&DWP(4,"esp")); }##%ebx
195         else        {   &mov    ($tmp,$s[2]);
196                         &shr    ($tmp,16);                      }
197         if ($i==2)  {   &and    ($s[1],0xFF);                   }#%edx[2]
198                         &and    ($tmp,0xFF);
199                         &xor    ($out,&DWP(2,$te,$tmp,8));
200
201         if ($i==3)  {   $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }##%ecx
202         elsif($i==2){   &movz   ($tmp,&HB($s[3]));              }#%ebx[2]
203         else        {   &mov    ($tmp,$s[3]); 
204                         &shr    ($tmp,24)                       }
205                         &xor    ($out,&DWP(1,$te,$tmp,8));
206         if ($i<2)   {   &mov    (&DWP(4+4*$i,"esp"),$out);      }
207         if ($i==3)  {   &mov    ($s[3],$acc);                   }
208                         &comment();
209 }
210
211 sub enclast()
212 { my ($i,$te,@s)=@_;
213   my $tmp = $key;
214   my $out = $i==3?$s[0]:$acc;
215
216         if ($i==3)  {   &mov    ($key,&DWP(12,"esp"));          }##%edx
217         else        {   &mov    ($out,$s[0]);                   }
218                         &and    ($out,0xFF);
219         if ($i==1)  {   &shr    ($s[0],16);                     }#%ebx[1]
220         if ($i==2)  {   &shr    ($s[0],24);                     }#%ecx[2]
221                         &mov    ($out,&DWP(2,$te,$out,8));
222                         &and    ($out,0x000000ff);
223
224         if ($i==3)  {   $tmp=$s[1];                             }##%eax
225                         &movz   ($tmp,&HB($s[1]));
226                         &mov    ($tmp,&DWP(0,$te,$tmp,8));
227                         &and    ($tmp,0x0000ff00);
228                         &xor    ($out,$tmp);
229
230         if ($i==3)  {   $tmp=$s[2]; &mov ($s[1],&DWP(4,"esp")); }##%ebx
231         else        {   mov     ($tmp,$s[2]);
232                         &shr    ($tmp,16);                      }
233         if ($i==2)  {   &and    ($s[1],0xFF);                   }#%edx[2]
234                         &and    ($tmp,0xFF);
235                         &mov    ($tmp,&DWP(0,$te,$tmp,8));
236                         &and    ($tmp,0x00ff0000);
237                         &xor    ($out,$tmp);
238
239         if ($i==3)  {   $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }##%ecx
240         elsif($i==2){   &movz   ($tmp,&HB($s[3]));              }#%ebx[2]
241         else        {   &mov    ($tmp,$s[3]);
242                         &shr    ($tmp,24);                      }
243                         &mov    ($tmp,&DWP(2,$te,$tmp,8));
244                         &and    ($tmp,0xff000000);
245                         &xor    ($out,$tmp);
246         if ($i<2)   {   &mov    (&DWP(4+4*$i,"esp"),$out);      }
247         if ($i==3)  {   &mov    ($s[3],$acc);                   }
248 }
249
250 sub _data_word() { my $i; while(defined($i=shift)) { &data_word($i,$i); } }
251
252 &public_label("AES_Te");
253 &function_begin_B("_x86_AES_encrypt");
254         if ($vertical_spin) {
255                 # I need high parts of volatile registers to be accessible...
256                 &exch   ($s1="edi",$key="ebx");
257                 &mov    ($s2="esi",$acc="ecx");
258         }
259
260         # note that caller is expected to allocate stack frame for me!
261         &mov    (&DWP(12,"esp"),$key);          # save key
262
263         &xor    ($s0,&DWP(0,$key));             # xor with key
264         &xor    ($s1,&DWP(4,$key));
265         &xor    ($s2,&DWP(8,$key));
266         &xor    ($s3,&DWP(12,$key));
267
268         &mov    ($acc,&DWP(240,$key));          # load key->rounds
269
270         if ($small_footprint) {
271             &lea        ($acc,&DWP(-2,$acc,$acc));
272             &lea        ($acc,&DWP(0,$key,$acc,8));
273             &mov        (&DWP(16,"esp"),$acc);  # end of key schedule
274             &align      (4);
275             &set_label("loop");
276                 if ($vertical_spin) {
277                     &encvert("ebp",$s0,$s1,$s2,$s3);
278                 } else {
279                     &encstep(0,"ebp",$s0,$s1,$s2,$s3);
280                     &encstep(1,"ebp",$s1,$s2,$s3,$s0);
281                     &encstep(2,"ebp",$s2,$s3,$s0,$s1);
282                     &encstep(3,"ebp",$s3,$s0,$s1,$s2);
283                 }
284                 &add    ($key,16);              # advance rd_key
285                 &xor    ($s0,&DWP(0,$key));
286                 &xor    ($s1,&DWP(4,$key));
287                 &xor    ($s2,&DWP(8,$key));
288                 &xor    ($s3,&DWP(12,$key));
289             &cmp        ($key,&DWP(16,"esp"));
290             &mov        (&DWP(12,"esp"),$key);
291             &jb         (&label("loop"));
292         }
293         else {
294             &cmp        ($acc,10);
295             &jle        (&label("10rounds"));
296             &cmp        ($acc,12);
297             &jle        (&label("12rounds"));
298
299         &set_label("14rounds");
300             for ($i=1;$i<3;$i++) {
301                 if ($vertical_spin) {
302                     &encvert("ebp",$s0,$s1,$s2,$s3);
303                 } else {
304                     &encstep(0,"ebp",$s0,$s1,$s2,$s3);
305                     &encstep(1,"ebp",$s1,$s2,$s3,$s0);
306                     &encstep(2,"ebp",$s2,$s3,$s0,$s1);
307                     &encstep(3,"ebp",$s3,$s0,$s1,$s2);
308                 }
309                 &xor    ($s0,&DWP(16*$i+0,$key));
310                 &xor    ($s1,&DWP(16*$i+4,$key));
311                 &xor    ($s2,&DWP(16*$i+8,$key));
312                 &xor    ($s3,&DWP(16*$i+12,$key));
313             }
314             &add        ($key,32);
315             &mov        (&DWP(12,"esp"),$key);  # advance rd_key
316         &set_label("12rounds");
317             for ($i=1;$i<3;$i++) {
318                 if ($vertical_spin) {
319                     &encvert("ebp",$s0,$s1,$s2,$s3);
320                 } else {
321                     &encstep(0,"ebp",$s0,$s1,$s2,$s3);
322                     &encstep(1,"ebp",$s1,$s2,$s3,$s0);
323                     &encstep(2,"ebp",$s2,$s3,$s0,$s1);
324                     &encstep(3,"ebp",$s3,$s0,$s1,$s2);
325                 }
326                 &xor    ($s0,&DWP(16*$i+0,$key));
327                 &xor    ($s1,&DWP(16*$i+4,$key));
328                 &xor    ($s2,&DWP(16*$i+8,$key));
329                 &xor    ($s3,&DWP(16*$i+12,$key));
330             }
331             &add        ($key,32);
332             &mov        (&DWP(12,"esp"),$key);  # advance rd_key
333         &set_label("10rounds");
334             for ($i=1;$i<10;$i++) {
335                 if ($vertical_spin) {
336                     &encvert("ebp",$s0,$s1,$s2,$s3);
337                 } else {
338                     &encstep(0,"ebp",$s0,$s1,$s2,$s3);
339                     &encstep(1,"ebp",$s1,$s2,$s3,$s0);
340                     &encstep(2,"ebp",$s2,$s3,$s0,$s1);
341                     &encstep(3,"ebp",$s3,$s0,$s1,$s2);
342                 }
343                 &xor    ($s0,&DWP(16*$i+0,$key));
344                 &xor    ($s1,&DWP(16*$i+4,$key));
345                 &xor    ($s2,&DWP(16*$i+8,$key));
346                 &xor    ($s3,&DWP(16*$i+12,$key));
347             }
348         }
349
350         if ($vertical_spin) {
351             # "reincarnate" some registers for "horizontal" spin...
352             &mov        ($s1="ebx",$key="edi");
353             &mov        ($s2="ecx",$acc="esi");
354         }
355         &enclast(0,"ebp",$s0,$s1,$s2,$s3);
356         &enclast(1,"ebp",$s1,$s2,$s3,$s0);
357         &enclast(2,"ebp",$s2,$s3,$s0,$s1);
358         &enclast(3,"ebp",$s3,$s0,$s1,$s2);
359
360         &add    ($key,$small_footprint?16:160);
361         &xor    ($s0,&DWP(0,$key));
362         &xor    ($s1,&DWP(4,$key));
363         &xor    ($s2,&DWP(8,$key));
364         &xor    ($s3,&DWP(12,$key));
365
366         &ret    ();
367
368 &set_label("AES_Te",64);        # Yes! I keep it in the code segment!
369         &_data_word(0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6);
370         &_data_word(0x0df2f2ff, 0xbd6b6bd6, 0xb16f6fde, 0x54c5c591);
371         &_data_word(0x50303060, 0x03010102, 0xa96767ce, 0x7d2b2b56);
372         &_data_word(0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec);
373         &_data_word(0x45caca8f, 0x9d82821f, 0x40c9c989, 0x877d7dfa);
374         &_data_word(0x15fafaef, 0xeb5959b2, 0xc947478e, 0x0bf0f0fb);
375         &_data_word(0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45);
376         &_data_word(0xbf9c9c23, 0xf7a4a453, 0x967272e4, 0x5bc0c09b);
377         &_data_word(0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c);
378         &_data_word(0x5a36366c, 0x413f3f7e, 0x02f7f7f5, 0x4fcccc83);
379         &_data_word(0x5c343468, 0xf4a5a551, 0x34e5e5d1, 0x08f1f1f9);
380         &_data_word(0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a);
381         &_data_word(0x0c040408, 0x52c7c795, 0x65232346, 0x5ec3c39d);
382         &_data_word(0x28181830, 0xa1969637, 0x0f05050a, 0xb59a9a2f);
383         &_data_word(0x0907070e, 0x36121224, 0x9b80801b, 0x3de2e2df);
384         &_data_word(0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea);
385         &_data_word(0x1b090912, 0x9e83831d, 0x742c2c58, 0x2e1a1a34);
386         &_data_word(0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b);
387         &_data_word(0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d);
388         &_data_word(0x7b292952, 0x3ee3e3dd, 0x712f2f5e, 0x97848413);
389         &_data_word(0xf55353a6, 0x68d1d1b9, 0x00000000, 0x2cededc1);
390         &_data_word(0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6);
391         &_data_word(0xbe6a6ad4, 0x46cbcb8d, 0xd9bebe67, 0x4b393972);
392         &_data_word(0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85);
393         &_data_word(0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed);
394         &_data_word(0xc5434386, 0xd74d4d9a, 0x55333366, 0x94858511);
395         &_data_word(0xcf45458a, 0x10f9f9e9, 0x06020204, 0x817f7ffe);
396         &_data_word(0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b);
397         &_data_word(0xf35151a2, 0xfea3a35d, 0xc0404080, 0x8a8f8f05);
398         &_data_word(0xad92923f, 0xbc9d9d21, 0x48383870, 0x04f5f5f1);
399         &_data_word(0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142);
400         &_data_word(0x30101020, 0x1affffe5, 0x0ef3f3fd, 0x6dd2d2bf);
401         &_data_word(0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3);
402         &_data_word(0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e);
403         &_data_word(0x57c4c493, 0xf2a7a755, 0x827e7efc, 0x473d3d7a);
404         &_data_word(0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6);
405         &_data_word(0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3);
406         &_data_word(0x66222244, 0x7e2a2a54, 0xab90903b, 0x8388880b);
407         &_data_word(0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428);
408         &_data_word(0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad);
409         &_data_word(0x3be0e0db, 0x56323264, 0x4e3a3a74, 0x1e0a0a14);
410         &_data_word(0xdb494992, 0x0a06060c, 0x6c242448, 0xe45c5cb8);
411         &_data_word(0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4);
412         &_data_word(0xa8919139, 0xa4959531, 0x37e4e4d3, 0x8b7979f2);
413         &_data_word(0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda);
414         &_data_word(0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949);
415         &_data_word(0xb46c6cd8, 0xfa5656ac, 0x07f4f4f3, 0x25eaeacf);
416         &_data_word(0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810);
417         &_data_word(0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c);
418         &_data_word(0x241c1c38, 0xf1a6a657, 0xc7b4b473, 0x51c6c697);
419         &_data_word(0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e);
420         &_data_word(0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f);
421         &_data_word(0x907070e0, 0x423e3e7c, 0xc4b5b571, 0xaa6666cc);
422         &_data_word(0xd8484890, 0x05030306, 0x01f6f6f7, 0x120e0e1c);
423         &_data_word(0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969);
424         &_data_word(0x91868617, 0x58c1c199, 0x271d1d3a, 0xb99e9e27);
425         &_data_word(0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122);
426         &_data_word(0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433);
427         &_data_word(0xb69b9b2d, 0x221e1e3c, 0x92878715, 0x20e9e9c9);
428         &_data_word(0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5);
429         &_data_word(0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a);
430         &_data_word(0xdabfbf65, 0x31e6e6d7, 0xc6424284, 0xb86868d0);
431         &_data_word(0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e);
432         &_data_word(0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c);
433 #rcon:
434         &data_word(0x00000001, 0x00000002, 0x00000004, 0x00000008);
435         &data_word(0x00000010, 0x00000020, 0x00000040, 0x00000080);
436         &data_word(0x0000001b, 0x00000036, 0, 0, 0, 0, 0, 0);
437 &function_end_B("_x86_AES_encrypt");
438
439 # void AES_encrypt (const void *inp,void *out,const AES_KEY *key);
440 &public_label("AES_Te");
441 &function_begin("AES_encrypt");
442         &mov    ($acc,&wparam(0));              # load inp
443         &mov    ($key,&wparam(2));              # load key
444
445         &mov    ($s0,"esp");
446         &sub    ("esp",24);
447         &and    ("esp",-64);
448         &add    ("esp",4);
449         &mov    (&DWP(16,"esp"),$s0);
450
451         &call   (&label("pic_point"));          # make it PIC!
452         &set_label("pic_point");
453         &blindpop("ebp");
454         &lea    ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
455
456         &mov    ($s0,&DWP(0,$acc));             # load input data
457         &mov    ($s1,&DWP(4,$acc));
458         &mov    ($s2,&DWP(8,$acc));
459         &mov    ($s3,&DWP(12,$acc));
460
461         &call   ("_x86_AES_encrypt");
462
463         &mov    ("esp",&DWP(16,"esp"));
464
465         &mov    ($acc,&wparam(1));              # load out
466         &mov    (&DWP(0,$acc),$s0);             # write output data
467         &mov    (&DWP(4,$acc),$s1);
468         &mov    (&DWP(8,$acc),$s2);
469         &mov    (&DWP(12,$acc),$s3);
470 &function_end("AES_encrypt");
471
472 #------------------------------------------------------------------#
473
474 sub decstep()
475 { my ($i,$td,@s) = @_;
476   my $tmp = $key;
477   my $out = $i==3?$s[0]:$acc;
478
479         # no instructions are reordered, as performance appears
480         # optimal... or rather that all attempts to reorder didn't
481         # result in better performance [which by the way is not a
482         # bit lower than ecryption].
483         if($i==3)   {   &mov    ($key,&DWP(12,"esp"));          }
484         else        {   &mov    ($out,$s[0]);                   }
485                         &and    ($out,0xFF);
486                         &mov    ($out,&DWP(0,$td,$out,8));
487
488         if ($i==3)  {   $tmp=$s[1];                             }
489                         &movz   ($tmp,&HB($s[1]));
490                         &xor    ($out,&DWP(3,$td,$tmp,8));
491
492         if ($i==3)  {   $tmp=$s[2]; &mov ($s[1],$acc);          }
493         else        {   &mov    ($tmp,$s[2]);                   }
494                         &shr    ($tmp,16);
495                         &and    ($tmp,0xFF);
496                         &xor    ($out,&DWP(2,$td,$tmp,8));
497
498         if ($i==3)  {   $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }
499         else        {   &mov    ($tmp,$s[3]);                   }
500                         &shr    ($tmp,24);
501                         &xor    ($out,&DWP(1,$td,$tmp,8));
502         if ($i<2)   {   &mov    (&DWP(4+4*$i,"esp"),$out);      }
503         if ($i==3)  {   &mov    ($s[3],&DWP(4,"esp"));          }
504                         &comment();
505 }
506
507 sub declast()
508 { my ($i,$td,@s)=@_;
509   my $tmp = $key;
510   my $out = $i==3?$s[0]:$acc;
511
512         if($i==3)   {   &mov    ($key,&DWP(12,"esp"));          }
513         else        {   &mov    ($out,$s[0]);                   }
514                         &and    ($out,0xFF);
515                         &movz   ($out,&DWP(2048,$td,$out,1));
516
517         if ($i==3)  {   $tmp=$s[1];                             }
518                         &movz   ($tmp,&HB($s[1]));
519                         &movz   ($tmp,&DWP(2048,$td,$tmp,1));
520                         &shl    ($tmp,8);
521                         &xor    ($out,$tmp);
522
523         if ($i==3)  {   $tmp=$s[2]; &mov ($s[1],$acc);          }
524         else        {   mov     ($tmp,$s[2]);                   }
525                         &shr    ($tmp,16);
526                         &and    ($tmp,0xFF);
527                         &movz   ($tmp,&DWP(2048,$td,$tmp,1));
528                         &shl    ($tmp,16);
529                         &xor    ($out,$tmp);
530
531         if ($i==3)  {   $tmp=$s[3]; &mov ($s[2],&DWP(8,"esp")); }
532         else        {   &mov    ($tmp,$s[3]);                   }
533                         &shr    ($tmp,24);
534                         &movz   ($tmp,&DWP(2048,$td,$tmp,1));
535                         &shl    ($tmp,24);
536                         &xor    ($out,$tmp);
537         if ($i<2)   {   &mov    (&DWP(4+4*$i,"esp"),$out);      }
538         if ($i==3)  {   &mov    ($s[3],&DWP(4,"esp"));          }
539 }
540
541 &public_label("AES_Td");
542 &function_begin_B("_x86_AES_decrypt");
543         # note that caller is expected to allocate stack frame for me!
544         &mov    (&DWP(12,"esp"),$key);          # save key
545
546         &xor    ($s0,&DWP(0,$key));             # xor with key
547         &xor    ($s1,&DWP(4,$key));
548         &xor    ($s2,&DWP(8,$key));
549         &xor    ($s3,&DWP(12,$key));
550
551         &mov    ($acc,&DWP(240,$key));          # load key->rounds
552
553         if ($small_footprint) {
554             &lea        ($acc,&DWP(-2,$acc,$acc));
555             &lea        ($acc,&DWP(0,$key,$acc,8));
556             &mov        (&DWP(16,"esp"),$acc);  # end of key schedule
557             &align      (4);
558             &set_label("loop");
559                 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
560                 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
561                 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
562                 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
563                 &add    ($key,16);              # advance rd_key
564                 &xor    ($s0,&DWP(0,$key));
565                 &xor    ($s1,&DWP(4,$key));
566                 &xor    ($s2,&DWP(8,$key));
567                 &xor    ($s3,&DWP(12,$key));
568             &cmp        ($key,&DWP(16,"esp"));
569             &mov        (&DWP(12,"esp"),$key);
570             &jb         (&label("loop"));
571         }
572         else {
573             &cmp        ($acc,10);
574             &jle        (&label("10rounds"));
575             &cmp        ($acc,12);
576             &jle        (&label("12rounds"));
577
578         &set_label("14rounds");
579             for ($i=1;$i<3;$i++) {
580                 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
581                 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
582                 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
583                 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
584                 &xor    ($s0,&DWP(16*$i+0,$key));
585                 &xor    ($s1,&DWP(16*$i+4,$key));
586                 &xor    ($s2,&DWP(16*$i+8,$key));
587                 &xor    ($s3,&DWP(16*$i+12,$key));
588             }
589             &add        ($key,32);
590             &mov        (&DWP(12,"esp"),$key);  # advance rd_key
591         &set_label("12rounds");
592             for ($i=1;$i<3;$i++) {
593                 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
594                 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
595                 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
596                 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
597                 &xor    ($s0,&DWP(16*$i+0,$key));
598                 &xor    ($s1,&DWP(16*$i+4,$key));
599                 &xor    ($s2,&DWP(16*$i+8,$key));
600                 &xor    ($s3,&DWP(16*$i+12,$key));
601             }
602             &add        ($key,32);
603             &mov        (&DWP(12,"esp"),$key);  # advance rd_key
604         &set_label("10rounds");
605             for ($i=1;$i<10;$i++) {
606                 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
607                 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
608                 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
609                 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
610                 &xor    ($s0,&DWP(16*$i+0,$key));
611                 &xor    ($s1,&DWP(16*$i+4,$key));
612                 &xor    ($s2,&DWP(16*$i+8,$key));
613                 &xor    ($s3,&DWP(16*$i+12,$key));
614             }
615         }
616
617         &declast(0,"ebp",$s0,$s3,$s2,$s1);
618         &declast(1,"ebp",$s1,$s0,$s3,$s2);
619         &declast(2,"ebp",$s2,$s1,$s0,$s3);
620         &declast(3,"ebp",$s3,$s2,$s1,$s0);
621
622         &add    ($key,$small_footprint?16:160);
623         &xor    ($s0,&DWP(0,$key));
624         &xor    ($s1,&DWP(4,$key));
625         &xor    ($s2,&DWP(8,$key));
626         &xor    ($s3,&DWP(12,$key));
627
628         &ret    ();
629
630 &set_label("AES_Td",64);        # Yes! I keep it in the code segment!
631         &_data_word(0x50a7f451, 0x5365417e, 0xc3a4171a, 0x965e273a);
632         &_data_word(0xcb6bab3b, 0xf1459d1f, 0xab58faac, 0x9303e34b);
633         &_data_word(0x55fa3020, 0xf66d76ad, 0x9176cc88, 0x254c02f5);
634         &_data_word(0xfcd7e54f, 0xd7cb2ac5, 0x80443526, 0x8fa362b5);
635         &_data_word(0x495ab1de, 0x671bba25, 0x980eea45, 0xe1c0fe5d);
636         &_data_word(0x02752fc3, 0x12f04c81, 0xa397468d, 0xc6f9d36b);
637         &_data_word(0xe75f8f03, 0x959c9215, 0xeb7a6dbf, 0xda595295);
638         &_data_word(0x2d83bed4, 0xd3217458, 0x2969e049, 0x44c8c98e);
639         &_data_word(0x6a89c275, 0x78798ef4, 0x6b3e5899, 0xdd71b927);
640         &_data_word(0xb64fe1be, 0x17ad88f0, 0x66ac20c9, 0xb43ace7d);
641         &_data_word(0x184adf63, 0x82311ae5, 0x60335197, 0x457f5362);
642         &_data_word(0xe07764b1, 0x84ae6bbb, 0x1ca081fe, 0x942b08f9);
643         &_data_word(0x58684870, 0x19fd458f, 0x876cde94, 0xb7f87b52);
644         &_data_word(0x23d373ab, 0xe2024b72, 0x578f1fe3, 0x2aab5566);
645         &_data_word(0x0728ebb2, 0x03c2b52f, 0x9a7bc586, 0xa50837d3);
646         &_data_word(0xf2872830, 0xb2a5bf23, 0xba6a0302, 0x5c8216ed);
647         &_data_word(0x2b1ccf8a, 0x92b479a7, 0xf0f207f3, 0xa1e2694e);
648         &_data_word(0xcdf4da65, 0xd5be0506, 0x1f6234d1, 0x8afea6c4);
649         &_data_word(0x9d532e34, 0xa055f3a2, 0x32e18a05, 0x75ebf6a4);
650         &_data_word(0x39ec830b, 0xaaef6040, 0x069f715e, 0x51106ebd);
651         &_data_word(0xf98a213e, 0x3d06dd96, 0xae053edd, 0x46bde64d);
652         &_data_word(0xb58d5491, 0x055dc471, 0x6fd40604, 0xff155060);
653         &_data_word(0x24fb9819, 0x97e9bdd6, 0xcc434089, 0x779ed967);
654         &_data_word(0xbd42e8b0, 0x888b8907, 0x385b19e7, 0xdbeec879);
655         &_data_word(0x470a7ca1, 0xe90f427c, 0xc91e84f8, 0x00000000);
656         &_data_word(0x83868009, 0x48ed2b32, 0xac70111e, 0x4e725a6c);
657         &_data_word(0xfbff0efd, 0x5638850f, 0x1ed5ae3d, 0x27392d36);
658         &_data_word(0x64d90f0a, 0x21a65c68, 0xd1545b9b, 0x3a2e3624);
659         &_data_word(0xb1670a0c, 0x0fe75793, 0xd296eeb4, 0x9e919b1b);
660         &_data_word(0x4fc5c080, 0xa220dc61, 0x694b775a, 0x161a121c);
661         &_data_word(0x0aba93e2, 0xe52aa0c0, 0x43e0223c, 0x1d171b12);
662         &_data_word(0x0b0d090e, 0xadc78bf2, 0xb9a8b62d, 0xc8a91e14);
663         &_data_word(0x8519f157, 0x4c0775af, 0xbbdd99ee, 0xfd607fa3);
664         &_data_word(0x9f2601f7, 0xbcf5725c, 0xc53b6644, 0x347efb5b);
665         &_data_word(0x7629438b, 0xdcc623cb, 0x68fcedb6, 0x63f1e4b8);
666         &_data_word(0xcadc31d7, 0x10856342, 0x40229713, 0x2011c684);
667         &_data_word(0x7d244a85, 0xf83dbbd2, 0x1132f9ae, 0x6da129c7);
668         &_data_word(0x4b2f9e1d, 0xf330b2dc, 0xec52860d, 0xd0e3c177);
669         &_data_word(0x6c16b32b, 0x99b970a9, 0xfa489411, 0x2264e947);
670         &_data_word(0xc48cfca8, 0x1a3ff0a0, 0xd82c7d56, 0xef903322);
671         &_data_word(0xc74e4987, 0xc1d138d9, 0xfea2ca8c, 0x360bd498);
672         &_data_word(0xcf81f5a6, 0x28de7aa5, 0x268eb7da, 0xa4bfad3f);
673         &_data_word(0xe49d3a2c, 0x0d927850, 0x9bcc5f6a, 0x62467e54);
674         &_data_word(0xc2138df6, 0xe8b8d890, 0x5ef7392e, 0xf5afc382);
675         &_data_word(0xbe805d9f, 0x7c93d069, 0xa92dd56f, 0xb31225cf);
676         &_data_word(0x3b99acc8, 0xa77d1810, 0x6e639ce8, 0x7bbb3bdb);
677         &_data_word(0x097826cd, 0xf418596e, 0x01b79aec, 0xa89a4f83);
678         &_data_word(0x656e95e6, 0x7ee6ffaa, 0x08cfbc21, 0xe6e815ef);
679         &_data_word(0xd99be7ba, 0xce366f4a, 0xd4099fea, 0xd67cb029);
680         &_data_word(0xafb2a431, 0x31233f2a, 0x3094a5c6, 0xc066a235);
681         &_data_word(0x37bc4e74, 0xa6ca82fc, 0xb0d090e0, 0x15d8a733);
682         &_data_word(0x4a9804f1, 0xf7daec41, 0x0e50cd7f, 0x2ff69117);
683         &_data_word(0x8dd64d76, 0x4db0ef43, 0x544daacc, 0xdf0496e4);
684         &_data_word(0xe3b5d19e, 0x1b886a4c, 0xb81f2cc1, 0x7f516546);
685         &_data_word(0x04ea5e9d, 0x5d358c01, 0x737487fa, 0x2e410bfb);
686         &_data_word(0x5a1d67b3, 0x52d2db92, 0x335610e9, 0x1347d66d);
687         &_data_word(0x8c61d79a, 0x7a0ca137, 0x8e14f859, 0x893c13eb);
688         &_data_word(0xee27a9ce, 0x35c961b7, 0xede51ce1, 0x3cb1477a);
689         &_data_word(0x59dfd29c, 0x3f73f255, 0x79ce1418, 0xbf37c773);
690         &_data_word(0xeacdf753, 0x5baafd5f, 0x146f3ddf, 0x86db4478);
691         &_data_word(0x81f3afca, 0x3ec468b9, 0x2c342438, 0x5f40a3c2);
692         &_data_word(0x72c31d16, 0x0c25e2bc, 0x8b493c28, 0x41950dff);
693         &_data_word(0x7101a839, 0xdeb30c08, 0x9ce4b4d8, 0x90c15664);
694         &_data_word(0x6184cb7b, 0x70b632d5, 0x745c6c48, 0x4257b8d0);
695 #Td4:
696         &data_byte(0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38);
697         &data_byte(0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb);
698         &data_byte(0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87);
699         &data_byte(0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb);
700         &data_byte(0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d);
701         &data_byte(0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e);
702         &data_byte(0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2);
703         &data_byte(0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25);
704         &data_byte(0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16);
705         &data_byte(0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92);
706         &data_byte(0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda);
707         &data_byte(0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84);
708         &data_byte(0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a);
709         &data_byte(0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06);
710         &data_byte(0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02);
711         &data_byte(0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b);
712         &data_byte(0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea);
713         &data_byte(0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73);
714         &data_byte(0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85);
715         &data_byte(0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e);
716         &data_byte(0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89);
717         &data_byte(0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b);
718         &data_byte(0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20);
719         &data_byte(0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4);
720         &data_byte(0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31);
721         &data_byte(0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f);
722         &data_byte(0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d);
723         &data_byte(0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef);
724         &data_byte(0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0);
725         &data_byte(0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61);
726         &data_byte(0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26);
727         &data_byte(0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d);
728 &function_end_B("_x86_AES_decrypt");
729
730 # void AES_decrypt (const void *inp,void *out,const AES_KEY *key);
731 &public_label("AES_Td");
732 &function_begin("AES_decrypt");
733         &mov    ($acc,&wparam(0));              # load inp
734         &mov    ($key,&wparam(2));              # load key
735
736         &mov    ($s0,"esp");
737         &sub    ("esp",24);
738         &and    ("esp",-64);
739         &add    ("esp",4);
740         &mov    (&DWP(16,"esp"),$s0);
741
742         &call   (&label("pic_point"));          # make it PIC!
743         &set_label("pic_point");
744         &blindpop("ebp");
745         &lea    ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
746
747         # prefetch Td4
748         &lea    ("ebp",&DWP(2048+128,"ebp"));
749         &mov    ($s0,&DWP(0-128,"ebp"));
750         &mov    ($s1,&DWP(32-128,"ebp"));
751         &mov    ($s2,&DWP(64-128,"ebp"));
752         &mov    ($s3,&DWP(96-128,"ebp"));
753         &mov    ($s0,&DWP(128-128,"ebp"));
754         &mov    ($s1,&DWP(160-128,"ebp"));
755         &mov    ($s2,&DWP(192-128,"ebp"));
756         &mov    ($s3,&DWP(224-128,"ebp"));
757         &lea    ("ebp",&DWP(-2048-128,"ebp"));
758
759         &mov    ($s0,&DWP(0,$acc));             # load input data
760         &mov    ($s1,&DWP(4,$acc));
761         &mov    ($s2,&DWP(8,$acc));
762         &mov    ($s3,&DWP(12,$acc));
763
764         &call   ("_x86_AES_decrypt");
765
766         &mov    ("esp",&DWP(16,"esp"));
767
768         &mov    ($acc,&wparam(1));              # load out
769         &mov    (&DWP(0,$acc),$s0);             # write output data
770         &mov    (&DWP(4,$acc),$s1);
771         &mov    (&DWP(8,$acc),$s2);
772         &mov    (&DWP(12,$acc),$s3);
773 &function_end("AES_decrypt");
774
775 # void AES_cbc_encrypt (const void char *inp, unsigned char *out,
776 #                       size_t length, const AES_KEY *key,
777 #                       unsigned char *ivp,const int enc);
778 {
779 # stack frame layout
780 # -4(%esp)      0(%esp)         return address
781 # 0(%esp)       4(%esp)         tmp1
782 # 4(%esp)       8(%esp)         tmp2
783 # 8(%esp)       12(%esp)        key
784 # 12(%esp)      16(%esp)        end of key schedule
785 my $_esp=&DWP(16,"esp");        #saved %esp
786 my $_inp=&DWP(20,"esp");        #copy of wparam(0)
787 my $_out=&DWP(24,"esp");        #copy of wparam(1)
788 my $_len=&DWP(28,"esp");        #copy of wparam(2)
789 my $_key=&DWP(32,"esp");        #copy of wparam(3)
790 my $_ivp=&DWP(36,"esp");        #copy of wparam(4)
791 my $_tmp=&DWP(40,"esp");        #volatile variable
792 my $ivec=&DWP(44,"esp");        #ivec[16]
793 my $aes_key=&DWP(60,"esp");     #copy of aes_key
794 my $mark=&DWP(60+240,"esp");    #copy of aes_key->rounds
795
796 &public_label("AES_Te");
797 &public_label("AES_Td");
798 &function_begin("AES_cbc_encrypt");
799         &mov    ($s2 eq "ecx"? $s2 : "",&wparam(2));    # load len
800         &cmp    ($s2,0);
801         &je     (&label("enc_out"));
802
803         &call   (&label("pic_point"));          # make it PIC!
804         &set_label("pic_point");
805         &blindpop("ebp");
806
807         &pushf  ();
808         &cld    ();
809
810         &cmp    (&wparam(5),0);
811         &je     (&label("DECRYPT"));
812
813         &lea    ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
814
815         # allocate aligned stack frame...
816         &lea    ($key,&DWP(-64-244,"esp"));
817         &and    ($key,-64);
818
819         # ... and make sure it doesn't alias with AES_Te modulo 4096
820         &mov    ($s0,"ebp");
821         &lea    ($s1,&DWP(2048,"ebp"));
822         &mov    ($s3,$key);
823         &and    ($s0,0xfff);            # s = %ebp&0xfff
824         &and    ($s1,0xfff);            # e = (%ebp+2048)&0xfff
825         &and    ($s3,0xfff);            # p = %esp&0xfff
826
827         &cmp    ($s3,$s1);              # if (p>=e) %esp =- (p-e);
828         &jb     (&label("te_break_out"));
829         &sub    ($s3,$s1);
830         &sub    ($key,$s3);
831         &jmp    (&label("te_ok"));
832         &set_label("te_break_out");     # else %esp -= (p-s)&0xfff + framesz;
833         &sub    ($s3,$s0);
834         &and    ($s3,0xfff);
835         &add    ($s3,64+256);
836         &sub    ($key,$s3);
837         &align  (4);
838         &set_label("te_ok");
839
840         &mov    ($s0,&wparam(0));       # load inp
841         &mov    ($s1,&wparam(1));       # load out
842         &mov    ($s3,&wparam(3));       # load key
843         &mov    ($acc,&wparam(4));      # load ivp
844
845         &exch   ("esp",$key);
846         &add    ("esp",4);              # reserve for return address!
847         &mov    ($_esp,$key);           # save %esp
848
849         &mov    ($_inp,$s0);            # save copy of inp
850         &mov    ($_out,$s1);            # save copy of out
851         &mov    ($_len,$s2);            # save copy of len
852         &mov    ($_key,$s3);            # save copy of key
853         &mov    ($_ivp,$acc);           # save copy of ivp
854
855         &mov    ($mark,0);              # copy of aes_key->rounds = 0;
856         if ($compromise) {
857                 &cmp    ($s2,$compromise);
858                 &jb     (&label("skip_ecopy"));
859         }
860         # do we copy key schedule to stack?
861         &mov    ($s1 eq "ebx" ? $s1 : "",$s3);
862         &mov    ($s2 eq "ecx" ? $s2 : "",244/4);
863         &sub    ($s1,"ebp");
864         &mov    ("esi",$s3);
865         &and    ($s1,0xfff);
866         &lea    ("edi",$aes_key);
867         &cmp    ($s1,2048);
868         &jb     (&label("do_ecopy"));
869         &cmp    ($s1,4096-244);
870         &jb     (&label("skip_ecopy"));
871         &align  (4);
872         &set_label("do_ecopy");
873                 &mov    ($_key,"edi");
874                 &data_word(0xA5F3F689); # rep movsd
875         &set_label("skip_ecopy");
876
877         &mov    ($acc,$s0);
878         &mov    ($key,16);
879         &align  (4);
880         &set_label("prefetch_te");
881                 &mov    ($s0,&DWP(0,"ebp"));
882                 &mov    ($s1,&DWP(32,"ebp"));
883                 &mov    ($s2,&DWP(64,"ebp"));
884                 &mov    ($s3,&DWP(96,"ebp"));
885                 &lea    ("ebp",&DWP(128,"ebp"));
886                 &dec    ($key);
887         &jnz    (&label("prefetch_te"));
888         &sub    ("ebp",2048);
889
890         &mov    ($s2,$_len);
891         &mov    ($key,$_ivp);
892         &test   ($s2,0xFFFFFFF0);
893         &jz     (&label("enc_tail"));           # short input...
894
895         &mov    ($s0,&DWP(0,$key));             # load iv
896         &mov    ($s1,&DWP(4,$key));
897
898         &align  (4);
899         &set_label("enc_loop");
900                 &mov    ($s2,&DWP(8,$key));
901                 &mov    ($s3,&DWP(12,$key));
902
903                 &xor    ($s0,&DWP(0,$acc));     # xor input data
904                 &xor    ($s1,&DWP(4,$acc));
905                 &xor    ($s2,&DWP(8,$acc));
906                 &xor    ($s3,&DWP(12,$acc));
907
908                 &mov    ($key,$_key);           # load key
909                 &call   ("_x86_AES_encrypt");
910
911                 &mov    ($acc,$_inp);           # load inp
912                 &mov    ($key,$_out);           # load out
913
914                 &mov    (&DWP(0,$key),$s0);     # save output data
915                 &mov    (&DWP(4,$key),$s1);
916                 &mov    (&DWP(8,$key),$s2);
917                 &mov    (&DWP(12,$key),$s3);
918
919                 &mov    ($s2,$_len);            # load len
920
921                 &lea    ($acc,&DWP(16,$acc));
922                 &mov    ($_inp,$acc);           # save inp
923
924                 &lea    ($s3,&DWP(16,$key));
925                 &mov    ($_out,$s3);            # save out
926
927                 &sub    ($s2,16);
928                 &test   ($s2,0xFFFFFFF0);
929                 &mov    ($_len,$s2);            # save len
930         &jnz    (&label("enc_loop"));
931         &test   ($s2,15);
932         &jnz    (&label("enc_tail"));
933         &mov    ($acc,$_ivp);           # load ivp
934         &mov    ($s2,&DWP(8,$key));     # restore last dwords
935         &mov    ($s3,&DWP(12,$key));
936         &mov    (&DWP(0,$acc),$s0);     # save ivec
937         &mov    (&DWP(4,$acc),$s1);
938         &mov    (&DWP(8,$acc),$s2);
939         &mov    (&DWP(12,$acc),$s3);
940
941         &cmp    ($mark,0);              # was the key schedule copied?
942         &mov    ("edi",$_key);
943         &mov    ("esp",$_esp);
944         &je     (&label("skip_ezero"));
945         # zero copy of key schedule
946         &mov    ("ecx",240/4);
947         &xor    ("eax","eax");
948         &align  (4);
949         &data_word(0xABF3F689); # rep stosd
950         &set_label("skip_ezero")
951         &popf   ();
952     &set_label("enc_out");
953         &function_end_A();
954         &pushf  ();                     # kludge, never executed
955
956     &align      (4);
957     &set_label("enc_tail");
958         &push   ($key eq "edi" ? $key : "");    # push ivp
959         &mov    ($key,$_out);                   # load out
960         &mov    ($s1,16);
961         &sub    ($s1,$s2);
962         &cmp    ($key,$acc);                    # compare with inp
963         &je     (&label("enc_in_place"));
964         &align  (4);
965         &data_word(0xA4F3F689); # rep movsb     # copy input
966         &jmp    (&label("enc_skip_in_place"));
967     &set_label("enc_in_place");
968         &lea    ($key,&DWP(0,$key,$s2));
969     &set_label("enc_skip_in_place");
970         &mov    ($s2,$s1);
971         &xor    ($s0,$s0);
972         &align  (4);
973         &data_word(0xAAF3F689); # rep stosb     # zero tail
974         &pop    ($key);                         # pop ivp
975
976         &mov    ($acc,$_out);                   # output as input
977         &mov    ($s0,&DWP(0,$key));
978         &mov    ($s1,&DWP(4,$key));
979         &mov    ($_len,16);                     # len=16
980         &jmp    (&label("enc_loop"));           # one more spin...
981
982 #----------------------------- DECRYPT -----------------------------#
983 &align  (4);
984 &set_label("DECRYPT");
985         &lea    ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
986
987         # allocate aligned stack frame...
988         &lea    ($key,&DWP(-64-244,"esp"));
989         &and    ($key,-64);
990
991         # ... and make sure it doesn't alias with AES_Td modulo 4096
992         &mov    ($s0,"ebp");
993         &lea    ($s1,&DWP(2048+256,"ebp"));
994         &mov    ($s3,$key);
995         &and    ($s0,0xfff);            # s = %ebp&0xfff
996         &and    ($s1,0xfff);            # e = (%ebp+2048+256)&0xfff
997         &and    ($s3,0xfff);            # p = %esp&0xfff
998
999         &cmp    ($s3,$s1);              # if (p>=e) %esp =- (p-e);
1000         &jb     (&label("td_break_out"));
1001         &sub    ($s3,$s1);
1002         &sub    ($key,$s3);
1003         &jmp    (&label("td_ok"));
1004         &set_label("td_break_out");     # else %esp -= (p-s)&0xfff + framesz;
1005         &sub    ($s3,$s0);
1006         &and    ($s3,0xfff);
1007         &add    ($s3,64+256);
1008         &sub    ($key,$s3);
1009         &align  (4);
1010         &set_label("td_ok");
1011
1012         &mov    ($s0,&wparam(0));       # load inp
1013         &mov    ($s1,&wparam(1));       # load out
1014         &mov    ($s3,&wparam(3));       # load key
1015         &mov    ($acc,&wparam(4));      # load ivp
1016
1017         &exch   ("esp",$key);
1018         &add    ("esp",4);              # reserve for return address!
1019         &mov    ($_esp,$key);           # save %esp
1020
1021         &mov    ($_inp,$s0);            # save copy of inp
1022         &mov    ($_out,$s1);            # save copy of out
1023         &mov    ($_len,$s2);            # save copy of len
1024         &mov    ($_key,$s3);            # save copy of key
1025         &mov    ($_ivp,$acc);           # save copy of ivp
1026
1027         &mov    ($mark,0);              # copy of aes_key->rounds = 0;
1028         if ($compromise) {
1029                 &cmp    ($s2,$compromise);
1030                 &jb     (&label("skip_dcopy"));
1031         }
1032         # do we copy key schedule to stack?
1033         &mov    ($s1 eq "ebx" ? $s1 : "",$s3);
1034         &mov    ($s2 eq "ecx" ? $s2 : "",244/4);
1035         &sub    ($s1,"ebp");
1036         &mov    ("esi",$s3);
1037         &and    ($s1,0xfff);
1038         &lea    ("edi",$aes_key);
1039         &cmp    ($s1,2048+256);
1040         &jb     (&label("do_dcopy"));
1041         &cmp    ($s1,4096-244);
1042         &jb     (&label("skip_dcopy"));
1043         &align  (4);
1044         &set_label("do_dcopy");
1045                 &mov    ($_key,"edi");
1046                 &data_word(0xA5F3F689); # rep movsd
1047         &set_label("skip_dcopy");
1048
1049         &mov    ($acc,$s0);
1050         &mov    ($key,18);
1051         &align  (4);
1052         &set_label("prefetch_td");
1053                 &mov    ($s0,&DWP(0,"ebp"));
1054                 &mov    ($s1,&DWP(32,"ebp"));
1055                 &mov    ($s2,&DWP(64,"ebp"));
1056                 &mov    ($s3,&DWP(96,"ebp"));
1057                 &lea    ("ebp",&DWP(128,"ebp"));
1058                 &dec    ($key);
1059         &jnz    (&label("prefetch_td"));
1060         &sub    ("ebp",2048+256);
1061
1062         &cmp    ($acc,$_out);
1063         &je     (&label("dec_in_place"));       # in-place processing...
1064
1065         &mov    ($key,$_ivp);           # load ivp
1066         &mov    ($_tmp,$key);
1067
1068         &align  (4);
1069         &set_label("dec_loop");
1070                 &mov    ($s0,&DWP(0,$acc));     # read input
1071                 &mov    ($s1,&DWP(4,$acc));
1072                 &mov    ($s2,&DWP(8,$acc));
1073                 &mov    ($s3,&DWP(12,$acc));
1074
1075                 &mov    ($key,$_key);           # load key
1076                 &call   ("_x86_AES_decrypt");
1077
1078                 &mov    ($key,$_tmp);           # load ivp
1079                 &mov    ($acc,$_len);           # load len
1080                 &xor    ($s0,&DWP(0,$key));     # xor iv
1081                 &xor    ($s1,&DWP(4,$key));
1082                 &xor    ($s2,&DWP(8,$key));
1083                 &xor    ($s3,&DWP(12,$key));
1084
1085                 &sub    ($acc,16);
1086                 &jc     (&label("dec_partial"));
1087                 &mov    ($_len,$acc);           # save len
1088                 &mov    ($acc,$_inp);           # load inp
1089                 &mov    ($key,$_out);           # load out
1090
1091                 &mov    (&DWP(0,$key),$s0);     # write output
1092                 &mov    (&DWP(4,$key),$s1);
1093                 &mov    (&DWP(8,$key),$s2);
1094                 &mov    (&DWP(12,$key),$s3);
1095
1096                 &mov    ($_tmp,$acc);           # save ivp
1097                 &lea    ($acc,&DWP(16,$acc));
1098                 &mov    ($_inp,$acc);           # save inp
1099
1100                 &lea    ($key,&DWP(16,$key));
1101                 &mov    ($_out,$key);           # save out
1102
1103         &jnz    (&label("dec_loop"));
1104         &mov    ($key,$_tmp);           # load temp ivp
1105     &set_label("dec_end");
1106         &mov    ($acc,$_ivp);           # load user ivp
1107         &mov    ($s0,&DWP(0,$key));     # load iv
1108         &mov    ($s1,&DWP(4,$key));
1109         &mov    ($s2,&DWP(8,$key));
1110         &mov    ($s3,&DWP(12,$key));
1111         &mov    (&DWP(0,$acc),$s0);     # copy back to user
1112         &mov    (&DWP(4,$acc),$s1);
1113         &mov    (&DWP(8,$acc),$s2);
1114         &mov    (&DWP(12,$acc),$s3);
1115         &jmp    (&label("dec_out"));
1116
1117     &align      (4);
1118     &set_label("dec_partial");
1119         &lea    ($key,$ivec);
1120         &mov    (&DWP(0,$key),$s0);     # dump output to stack
1121         &mov    (&DWP(4,$key),$s1);
1122         &mov    (&DWP(8,$key),$s2);
1123         &mov    (&DWP(12,$key),$s3);
1124         &lea    ($s2 eq "ecx" ? $s2 : "",&DWP(16,$acc));
1125         &mov    ($acc eq "esi" ? $acc : "",$key);
1126         &mov    ($key eq "edi" ? $key : "",$_out);      # load out
1127         &data_word(0xA4F3F689); # rep movsb             # copy output
1128         &mov    ($key,$_inp);                           # use inp as temp ivp
1129         &jmp    (&label("dec_end"));
1130
1131     &align      (4);
1132     &set_label("dec_in_place");
1133         &set_label("dec_in_place_loop");
1134                 &lea    ($key,$ivec);
1135                 &mov    ($s0,&DWP(0,$acc));     # read input
1136                 &mov    ($s1,&DWP(4,$acc));
1137                 &mov    ($s2,&DWP(8,$acc));
1138                 &mov    ($s3,&DWP(12,$acc));
1139
1140                 &mov    (&DWP(0,$key),$s0);     # copy to temp
1141                 &mov    (&DWP(4,$key),$s1);
1142                 &mov    (&DWP(8,$key),$s2);
1143                 &mov    (&DWP(12,$key),$s3);
1144
1145                 &mov    ($key,$_key);           # load key
1146                 &call   ("_x86_AES_decrypt");
1147
1148                 &mov    ($key,$_ivp);           # load ivp
1149                 &mov    ($acc,$_out);           # load out
1150                 &xor    ($s0,&DWP(0,$key));     # xor iv
1151                 &xor    ($s1,&DWP(4,$key));
1152                 &xor    ($s2,&DWP(8,$key));
1153                 &xor    ($s3,&DWP(12,$key));
1154
1155                 &mov    (&DWP(0,$acc),$s0);     # write output
1156                 &mov    (&DWP(4,$acc),$s1);
1157                 &mov    (&DWP(8,$acc),$s2);
1158                 &mov    (&DWP(12,$acc),$s3);
1159
1160                 &lea    ($acc,&DWP(16,$acc));
1161                 &mov    ($_out,$acc);           # save out
1162
1163                 &lea    ($acc,$ivec);
1164                 &mov    ($s0,&DWP(0,$acc));     # read temp
1165                 &mov    ($s1,&DWP(4,$acc));
1166                 &mov    ($s2,&DWP(8,$acc));
1167                 &mov    ($s3,&DWP(12,$acc));
1168
1169                 &mov    (&DWP(0,$key),$s0);     # copy iv
1170                 &mov    (&DWP(4,$key),$s1);
1171                 &mov    (&DWP(8,$key),$s2);
1172                 &mov    (&DWP(12,$key),$s3);
1173
1174                 &mov    ($acc,$_inp);           # load inp
1175
1176                 &lea    ($acc,&DWP(16,$acc));
1177                 &mov    ($_inp,$acc);           # save inp
1178
1179                 &mov    ($s2,$_len);            # load len
1180                 &sub    ($s2,16);
1181                 &jc     (&label("dec_in_place_partial"));
1182                 &mov    ($_len,$s2);            # save len
1183         &jnz    (&label("dec_in_place_loop"));
1184         &jmp    (&label("dec_out"));
1185
1186     &align      (4);
1187     &set_label("dec_in_place_partial");
1188         # one can argue if this is actually required...
1189         &mov    ($key eq "edi" ? $key : "",$_out);
1190         &lea    ($acc eq "esi" ? $acc : "",$ivec);
1191         &lea    ($key,&DWP(0,$key,$s2));
1192         &lea    ($acc,&DWP(16,$acc,$s2));
1193         &neg    ($s2 eq "ecx" ? $s2 : "");
1194         &data_word(0xA4F3F689); # rep movsb     # restore tail
1195
1196     &align      (4);
1197     &set_label("dec_out");
1198     &cmp        ($mark,0);              # was the key schedule copied?
1199     &mov        ("edi",$_key);
1200     &mov        ("esp",$_esp);
1201     &je         (&label("skip_dzero"));
1202     # zero copy of key schedule
1203     &mov        ("ecx",240/4);
1204     &xor        ("eax","eax");
1205     &align      (4);
1206     &data_word(0xABF3F689);     # rep stosd
1207     &set_label("skip_dzero")
1208     &popf       ();
1209 &function_end("AES_cbc_encrypt");
1210 }
1211
1212 #------------------------------------------------------------------#
1213
1214 sub enckey()
1215 {
1216         &movz   ("esi",&LB("edx"));             # rk[i]>>0
1217         &mov    ("ebx",&DWP(2,"ebp","esi",8));
1218         &movz   ("esi",&HB("edx"));             # rk[i]>>8
1219         &and    ("ebx",0xFF000000);
1220         &xor    ("eax","ebx");
1221
1222         &mov    ("ebx",&DWP(2,"ebp","esi",8));
1223         &shr    ("edx",16);
1224         &and    ("ebx",0x000000FF);
1225         &movz   ("esi",&LB("edx"));             # rk[i]>>16
1226         &xor    ("eax","ebx");
1227
1228         &mov    ("ebx",&DWP(0,"ebp","esi",8));
1229         &movz   ("esi",&HB("edx"));             # rk[i]>>24
1230         &and    ("ebx",0x0000FF00);
1231         &xor    ("eax","ebx");
1232
1233         &mov    ("ebx",&DWP(0,"ebp","esi",8));
1234         &and    ("ebx",0x00FF0000);
1235         &xor    ("eax","ebx");
1236
1237         &xor    ("eax",&DWP(2048,"ebp","ecx",4));       # rcon
1238 }
1239
1240 # int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
1241 #                        AES_KEY *key)
1242 &public_label("AES_Te");
1243 &function_begin("AES_set_encrypt_key");
1244         &mov    ("esi",&wparam(0));             # user supplied key
1245         &mov    ("edi",&wparam(2));             # private key schedule
1246
1247         &test   ("esi",-1);
1248         &jz     (&label("badpointer"));
1249         &test   ("edi",-1);
1250         &jz     (&label("badpointer"));
1251
1252         &call   (&label("pic_point"));
1253         &set_label("pic_point");
1254         &blindpop("ebp");
1255         &lea    ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
1256
1257         &mov    ("ecx",&wparam(1));             # number of bits in key
1258         &cmp    ("ecx",128);
1259         &je     (&label("10rounds"));
1260         &cmp    ("ecx",192);
1261         &je     (&label("12rounds"));
1262         &cmp    ("ecx",256);
1263         &je     (&label("14rounds"));
1264         &mov    ("eax",-2);                     # invalid number of bits
1265         &jmp    (&label("exit"));
1266
1267     &set_label("10rounds");
1268         &mov    ("eax",&DWP(0,"esi"));          # copy first 4 dwords
1269         &mov    ("ebx",&DWP(4,"esi"));
1270         &mov    ("ecx",&DWP(8,"esi"));
1271         &mov    ("edx",&DWP(12,"esi"));
1272         &mov    (&DWP(0,"edi"),"eax");
1273         &mov    (&DWP(4,"edi"),"ebx");
1274         &mov    (&DWP(8,"edi"),"ecx");
1275         &mov    (&DWP(12,"edi"),"edx");
1276
1277         &xor    ("ecx","ecx");
1278         &jmp    (&label("10shortcut"));
1279
1280         &align  (4);
1281         &set_label("10loop");
1282                 &mov    ("eax",&DWP(0,"edi"));          # rk[0]
1283                 &mov    ("edx",&DWP(12,"edi"));         # rk[3]
1284         &set_label("10shortcut");
1285                 &enckey ();
1286
1287                 &mov    (&DWP(16,"edi"),"eax");         # rk[4]
1288                 &xor    ("eax",&DWP(4,"edi"));
1289                 &mov    (&DWP(20,"edi"),"eax");         # rk[5]
1290                 &xor    ("eax",&DWP(8,"edi"));
1291                 &mov    (&DWP(24,"edi"),"eax");         # rk[6]
1292                 &xor    ("eax",&DWP(12,"edi"));
1293                 &mov    (&DWP(28,"edi"),"eax");         # rk[7]
1294                 &inc    ("ecx");
1295                 &add    ("edi",16);
1296                 &cmp    ("ecx",10);
1297         &jl     (&label("10loop"));
1298
1299         &mov    (&DWP(80,"edi"),10);            # setup number of rounds
1300         &xor    ("eax","eax");
1301         &jmp    (&label("exit"));
1302                 
1303     &set_label("12rounds");
1304         &mov    ("eax",&DWP(0,"esi"));          # copy first 6 dwords
1305         &mov    ("ebx",&DWP(4,"esi"));
1306         &mov    ("ecx",&DWP(8,"esi"));
1307         &mov    ("edx",&DWP(12,"esi"));
1308         &mov    (&DWP(0,"edi"),"eax");
1309         &mov    (&DWP(4,"edi"),"ebx");
1310         &mov    (&DWP(8,"edi"),"ecx");
1311         &mov    (&DWP(12,"edi"),"edx");
1312         &mov    ("ecx",&DWP(16,"esi"));
1313         &mov    ("edx",&DWP(20,"esi"));
1314         &mov    (&DWP(16,"edi"),"ecx");
1315         &mov    (&DWP(20,"edi"),"edx");
1316
1317         &xor    ("ecx","ecx");
1318         &jmp    (&label("12shortcut"));
1319
1320         &align  (4);
1321         &set_label("12loop");
1322                 &mov    ("eax",&DWP(0,"edi"));          # rk[0]
1323                 &mov    ("edx",&DWP(20,"edi"));         # rk[5]
1324         &set_label("12shortcut");
1325                 &enckey ();
1326
1327                 &mov    (&DWP(24,"edi"),"eax");         # rk[6]
1328                 &xor    ("eax",&DWP(4,"edi"));
1329                 &mov    (&DWP(28,"edi"),"eax");         # rk[7]
1330                 &xor    ("eax",&DWP(8,"edi"));
1331                 &mov    (&DWP(32,"edi"),"eax");         # rk[8]
1332                 &xor    ("eax",&DWP(12,"edi"));
1333                 &mov    (&DWP(36,"edi"),"eax");         # rk[9]
1334
1335                 &cmp    ("ecx",7);
1336                 &je     (&label("12break"));
1337                 &inc    ("ecx");
1338
1339                 &xor    ("eax",&DWP(16,"edi"));
1340                 &mov    (&DWP(40,"edi"),"eax");         # rk[10]
1341                 &xor    ("eax",&DWP(20,"edi"));
1342                 &mov    (&DWP(44,"edi"),"eax");         # rk[11]
1343
1344                 &add    ("edi",24);
1345         &jmp    (&label("12loop"));
1346
1347         &set_label("12break");
1348         &mov    (&DWP(72,"edi"),12);            # setup number of rounds
1349         &xor    ("eax","eax");
1350         &jmp    (&label("exit"));
1351
1352     &set_label("14rounds");
1353         &mov    ("eax",&DWP(0,"esi"));          # copy first 8 dwords
1354         &mov    ("ebx",&DWP(4,"esi"));
1355         &mov    ("ecx",&DWP(8,"esi"));
1356         &mov    ("edx",&DWP(12,"esi"));
1357         &mov    (&DWP(0,"edi"),"eax");
1358         &mov    (&DWP(4,"edi"),"ebx");
1359         &mov    (&DWP(8,"edi"),"ecx");
1360         &mov    (&DWP(12,"edi"),"edx");
1361         &mov    ("eax",&DWP(16,"esi"));
1362         &mov    ("ebx",&DWP(20,"esi"));
1363         &mov    ("ecx",&DWP(24,"esi"));
1364         &mov    ("edx",&DWP(28,"esi"));
1365         &mov    (&DWP(16,"edi"),"eax");
1366         &mov    (&DWP(20,"edi"),"ebx");
1367         &mov    (&DWP(24,"edi"),"ecx");
1368         &mov    (&DWP(28,"edi"),"edx");
1369
1370         &xor    ("ecx","ecx");
1371         &jmp    (&label("14shortcut"));
1372
1373         &align  (4);
1374         &set_label("14loop");
1375                 &mov    ("edx",&DWP(28,"edi"));         # rk[7]
1376         &set_label("14shortcut");
1377                 &mov    ("eax",&DWP(0,"edi"));          # rk[0]
1378
1379                 &enckey ();
1380
1381                 &mov    (&DWP(32,"edi"),"eax");         # rk[8]
1382                 &xor    ("eax",&DWP(4,"edi"));
1383                 &mov    (&DWP(36,"edi"),"eax");         # rk[9]
1384                 &xor    ("eax",&DWP(8,"edi"));
1385                 &mov    (&DWP(40,"edi"),"eax");         # rk[10]
1386                 &xor    ("eax",&DWP(12,"edi"));
1387                 &mov    (&DWP(44,"edi"),"eax");         # rk[11]
1388
1389                 &cmp    ("ecx",6);
1390                 &je     (&label("14break"));
1391                 &inc    ("ecx");
1392
1393                 &mov    ("edx","eax");
1394                 &mov    ("eax",&DWP(16,"edi"));         # rk[4]
1395                 &movz   ("esi",&LB("edx"));             # rk[11]>>0
1396                 &mov    ("ebx",&DWP(2,"ebp","esi",8));
1397                 &movz   ("esi",&HB("edx"));             # rk[11]>>8
1398                 &and    ("ebx",0x000000FF);
1399                 &xor    ("eax","ebx");
1400
1401                 &mov    ("ebx",&DWP(0,"ebp","esi",8));
1402                 &shr    ("edx",16);
1403                 &and    ("ebx",0x0000FF00);
1404                 &movz   ("esi",&LB("edx"));             # rk[11]>>16
1405                 &xor    ("eax","ebx");
1406
1407                 &mov    ("ebx",&DWP(0,"ebp","esi",8));
1408                 &movz   ("esi",&HB("edx"));             # rk[11]>>24
1409                 &and    ("ebx",0x00FF0000);
1410                 &xor    ("eax","ebx");
1411
1412                 &mov    ("ebx",&DWP(2,"ebp","esi",8));
1413                 &and    ("ebx",0xFF000000);
1414                 &xor    ("eax","ebx");
1415
1416                 &mov    (&DWP(48,"edi"),"eax");         # rk[12]
1417                 &xor    ("eax",&DWP(20,"edi"));
1418                 &mov    (&DWP(52,"edi"),"eax");         # rk[13]
1419                 &xor    ("eax",&DWP(24,"edi"));
1420                 &mov    (&DWP(56,"edi"),"eax");         # rk[14]
1421                 &xor    ("eax",&DWP(28,"edi"));
1422                 &mov    (&DWP(60,"edi"),"eax");         # rk[15]
1423
1424                 &add    ("edi",32);
1425         &jmp    (&label("14loop"));
1426
1427         &set_label("14break");
1428         &mov    (&DWP(48,"edi"),14);            # setup number of rounds
1429         &xor    ("eax","eax");
1430         &jmp    (&label("exit"));
1431
1432     &set_label("badpointer");
1433         &mov    ("eax",-1);
1434     &set_label("exit");
1435 &function_end("AES_set_encrypt_key");
1436
1437 sub deckey()
1438 { my ($i,$ptr,$te,$td) = @_;
1439
1440         &mov    ("eax",&DWP($i,$ptr));
1441         &mov    ("edx","eax");
1442         &movz   ("ebx",&HB("eax"));
1443         &shr    ("edx",16);
1444         &and    ("eax",0xFF);
1445         &movz   ("eax",&BP(2,$te,"eax",8));
1446         &movz   ("ebx",&BP(2,$te,"ebx",8));
1447         &mov    ("eax",&DWP(0,$td,"eax",8));
1448         &xor    ("eax",&DWP(3,$td,"ebx",8));
1449         &movz   ("ebx",&HB("edx"));
1450         &and    ("edx",0xFF);
1451         &movz   ("edx",&BP(2,$te,"edx",8));
1452         &movz   ("ebx",&BP(2,$te,"ebx",8));
1453         &xor    ("eax",&DWP(2,$td,"edx",8));
1454         &xor    ("eax",&DWP(1,$td,"ebx",8));
1455         &mov    (&DWP($i,$ptr),"eax");
1456 }
1457
1458 # int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
1459 #                        AES_KEY *key)
1460 &public_label("AES_Td");
1461 &public_label("AES_Te");
1462 &function_begin_B("AES_set_decrypt_key");
1463         &mov    ("eax",&wparam(0));
1464         &mov    ("ecx",&wparam(1));
1465         &mov    ("edx",&wparam(2));
1466         &sub    ("esp",12);
1467         &mov    (&DWP(0,"esp"),"eax");
1468         &mov    (&DWP(4,"esp"),"ecx");
1469         &mov    (&DWP(8,"esp"),"edx");
1470         &call   ("AES_set_encrypt_key");
1471         &add    ("esp",12);
1472         &cmp    ("eax",0);
1473         &je     (&label("proceed"));
1474         &ret    ();
1475
1476     &set_label("proceed");
1477         &push   ("ebp");
1478         &push   ("ebx");
1479         &push   ("esi");
1480         &push   ("edi");
1481
1482         &mov    ("esi",&wparam(2));
1483         &mov    ("ecx",&DWP(240,"esi"));        # pull number of rounds
1484         &lea    ("ecx",&DWP(0,"","ecx",4));
1485         &lea    ("edi",&DWP(0,"esi","ecx",4));  # pointer to last chunk
1486
1487         &align  (4);
1488         &set_label("invert");                   # invert order of chunks
1489                 &mov    ("eax",&DWP(0,"esi"));
1490                 &mov    ("ebx",&DWP(4,"esi"));
1491                 &mov    ("ecx",&DWP(0,"edi"));
1492                 &mov    ("edx",&DWP(4,"edi"));
1493                 &mov    (&DWP(0,"edi"),"eax");
1494                 &mov    (&DWP(4,"edi"),"ebx");
1495                 &mov    (&DWP(0,"esi"),"ecx");
1496                 &mov    (&DWP(4,"esi"),"edx");
1497                 &mov    ("eax",&DWP(8,"esi"));
1498                 &mov    ("ebx",&DWP(12,"esi"));
1499                 &mov    ("ecx",&DWP(8,"edi"));
1500                 &mov    ("edx",&DWP(12,"edi"));
1501                 &mov    (&DWP(8,"edi"),"eax");
1502                 &mov    (&DWP(12,"edi"),"ebx");
1503                 &mov    (&DWP(8,"esi"),"ecx");
1504                 &mov    (&DWP(12,"esi"),"edx");
1505                 &add    ("esi",16);
1506                 &sub    ("edi",16);
1507                 &cmp    ("esi","edi");
1508         &jne    (&label("invert"));
1509
1510         &call   (&label("pic_point"));
1511         &set_label("pic_point");
1512         blindpop("ebp");
1513         &lea    ("edi",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
1514         &lea    ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
1515
1516         &mov    ("esi",&wparam(2));
1517         &mov    ("ecx",&DWP(240,"esi"));        # pull number of rounds
1518         &dec    ("ecx");
1519         &align  (4);
1520         &set_label("permute");                  # permute the key schedule
1521                 &add    ("esi",16);
1522                 &deckey (0,"esi","ebp","edi");
1523                 &deckey (4,"esi","ebp","edi");
1524                 &deckey (8,"esi","ebp","edi");
1525                 &deckey (12,"esi","ebp","edi");
1526                 &dec    ("ecx");
1527         &jnz    (&label("permute"));
1528
1529         &xor    ("eax","eax");                  # return success
1530 &function_end("AES_set_decrypt_key");
1531
1532 &asm_finish();