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Mitigate cache-timing attack in CBC mode. This is done by implementing
[thirdparty/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 3.2.
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 # Current ECB performance numbers for 128-bit key in CPU cycles per
64 # processed byte [measure commonly used by AES benchmarkers] are:
65 #
66 # small footprint fully unrolled
67 # P4 24 22
68 # AMD K8 20 19
69 # PIII 25 23
70 # Pentium 81 78
71
72 push(@INC,"perlasm","../../perlasm");
73 require "x86asm.pl";
74
75 &asm_init($ARGV[0],"aes-586.pl",$ARGV[$#ARGV] eq "386");
76
77 $s0="eax";
78 $s1="ebx";
79 $s2="ecx";
80 $s3="edx";
81 $key="edi";
82 $acc="esi";
83
84 $small_footprint=1; # $small_footprint=1 code is ~5% slower [on
85 # recent µ-archs], but ~5 times smaller!
86 # I favor compact code to minimize cache
87 # contention and in hope to "collect" 5% back
88 # in real-life applications...
89 $vertical_spin=0; # shift "verticaly" defaults to 0, because of
90 # its proof-of-concept status...
91
92 # Note that there is no decvert(), as well as last encryption round is
93 # performed with "horizontal" shifts. This is because this "vertical"
94 # implementation [one which groups shifts on a given $s[i] to form a
95 # "column," unlike "horizontal" one, which groups shifts on different
96 # $s[i] to form a "row"] is work in progress. It was observed to run
97 # few percents faster on Intel cores, but not AMD. On AMD K8 core it's
98 # whole 12% slower:-( So we face a trade-off... Shall it be resolved
99 # some day? Till then the code is considered experimental and by
100 # default remains dormant...
101
102 sub encvert()
103 { my ($te,@s) = @_;
104 my $v0 = $acc, $v1 = $key;
105
106 &mov ($v0,$s[3]); # copy s3
107 &mov (&DWP(0,"esp"),$s[2]); # save s2
108 &mov ($v1,$s[0]); # copy s0
109 &mov (&DWP(4,"esp"),$s[1]); # save s1
110
111 &movz ($s[2],&HB($s[0]));
112 &and ($s[0],0xFF);
113 &mov ($s[0],&DWP(0,$te,$s[0],8)); # s0>>0
114 &shr ($v1,16);
115 &mov ($s[3],&DWP(3,$te,$s[2],8)); # s0>>8
116 &movz ($s[1],&HB($v1));
117 &and ($v1,0xFF);
118 &mov ($s[2],&DWP(2,$te,$v1,8)); # s0>>16
119 &mov ($v1,$v0);
120 &mov ($s[1],&DWP(1,$te,$s[1],8)); # s0>>24
121
122 &and ($v0,0xFF);
123 &xor ($s[3],&DWP(0,$te,$v0,8)); # s3>>0
124 &movz ($v0,&HB($v1));
125 &shr ($v1,16);
126 &xor ($s[2],&DWP(3,$te,$v0,8)); # s3>>8
127 &movz ($v0,&HB($v1));
128 &and ($v1,0xFF);
129 &xor ($s[1],&DWP(2,$te,$v1,8)); # s3>>16
130 &mov ($v1,&DWP(0,"esp")); # restore s2
131 &xor ($s[0],&DWP(1,$te,$v0,8)); # s3>>24
132
133 &mov ($v0,$v1);
134 &and ($v1,0xFF);
135 &xor ($s[2],&DWP(0,$te,$v1,8)); # s2>>0
136 &movz ($v1,&HB($v0));
137 &shr ($v0,16);
138 &xor ($s[1],&DWP(3,$te,$v1,8)); # s2>>8
139 &movz ($v1,&HB($v0));
140 &and ($v0,0xFF);
141 &xor ($s[0],&DWP(2,$te,$v0,8)); # s2>>16
142 &mov ($v0,&DWP(4,"esp")); # restore s1
143 &xor ($s[3],&DWP(1,$te,$v1,8)); # s2>>24
144
145 &mov ($v1,$v0);
146 &and ($v0,0xFF);
147 &xor ($s[1],&DWP(0,$te,$v0,8)); # s1>>0
148 &movz ($v0,&HB($v1));
149 &shr ($v1,16);
150 &xor ($s[0],&DWP(3,$te,$v0,8)); # s1>>8
151 &movz ($v0,&HB($v1));
152 &and ($v1,0xFF);
153 &xor ($s[3],&DWP(2,$te,$v1,8)); # s1>>16
154 &mov ($key,&DWP(12,"esp")); # reincarnate v1 as key
155 &xor ($s[2],&DWP(1,$te,$v0,8)); # s1>>24
156 }
157
158 sub encstep()
159 { my ($i,$te,@s) = @_;
160 my $tmp = $key;
161 my $out = $i==3?$s[0]:$acc;
162
163 # lines marked with #%e?x[i] denote "reordered" instructions...
164 if ($i==3) { &mov ($key,&DWP(12,"esp")); }##%edx
165 else { &mov ($out,$s[0]);
166 &and ($out,0xFF); }
167 if ($i==1) { &shr ($s[0],16); }#%ebx[1]
168 if ($i==2) { &shr ($s[0],24); }#%ecx[2]
169 &mov ($out,&DWP(0,$te,$out,8));
170
171 if ($i==3) { $tmp=$s[1]; }##%eax
172 &movz ($tmp,&HB($s[1]));
173 &xor ($out,&DWP(3,$te,$tmp,8));
174
175 if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(0,"esp")); }##%ebx
176 else { &mov ($tmp,$s[2]);
177 &shr ($tmp,16); }
178 if ($i==2) { &and ($s[1],0xFF); }#%edx[2]
179 &and ($tmp,0xFF);
180 &xor ($out,&DWP(2,$te,$tmp,8));
181
182 if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }##%ecx
183 elsif($i==2){ &movz ($tmp,&HB($s[3])); }#%ebx[2]
184 else { &mov ($tmp,$s[3]);
185 &shr ($tmp,24) }
186 &xor ($out,&DWP(1,$te,$tmp,8));
187 if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
188 if ($i==3) { &mov ($s[3],$acc); }
189 &comment();
190 }
191
192 sub enclast()
193 { my ($i,$te,@s)=@_;
194 my $tmp = $key;
195 my $out = $i==3?$s[0]:$acc;
196
197 if ($i==3) { &mov ($key,&DWP(12,"esp")); }##%edx
198 else { &mov ($out,$s[0]); }
199 &and ($out,0xFF);
200 if ($i==1) { &shr ($s[0],16); }#%ebx[1]
201 if ($i==2) { &shr ($s[0],24); }#%ecx[2]
202 &mov ($out,&DWP(2,$te,$out,8));
203 &and ($out,0x000000ff);
204
205 if ($i==3) { $tmp=$s[1]; }##%eax
206 &movz ($tmp,&HB($s[1]));
207 &mov ($tmp,&DWP(0,$te,$tmp,8));
208 &and ($tmp,0x0000ff00);
209 &xor ($out,$tmp);
210
211 if ($i==3) { $tmp=$s[2]; &mov ($s[1],&DWP(0,"esp")); }##%ebx
212 else { mov ($tmp,$s[2]);
213 &shr ($tmp,16); }
214 if ($i==2) { &and ($s[1],0xFF); }#%edx[2]
215 &and ($tmp,0xFF);
216 &mov ($tmp,&DWP(0,$te,$tmp,8));
217 &and ($tmp,0x00ff0000);
218 &xor ($out,$tmp);
219
220 if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }##%ecx
221 elsif($i==2){ &movz ($tmp,&HB($s[3])); }#%ebx[2]
222 else { &mov ($tmp,$s[3]);
223 &shr ($tmp,24); }
224 &mov ($tmp,&DWP(2,$te,$tmp,8));
225 &and ($tmp,0xff000000);
226 &xor ($out,$tmp);
227 if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
228 if ($i==3) { &mov ($s[3],$acc); }
229 }
230
231 sub _data_word() { my $i; while(defined($i=shift)) { &data_word($i,$i); } }
232
233 &public_label("AES_Te");
234 &function_begin_B("_x86_AES_encrypt");
235 if ($vertical_spin) {
236 # I need high parts of volatile registers to be accessible...
237 &exch ($s1="edi",$key="ebx");
238 &mov ($s2="esi",$acc="ecx");
239 }
240
241 # allocate aligned stack frame
242 &mov ($acc,"esp");
243 &sub ("esp",20);
244 &and ("esp",-16);
245
246 &mov (&DWP(12,"esp"),$key); # save key
247 &mov (&DWP(16,"esp"),$acc); # save %esp
248
249 &xor ($s0,&DWP(0,$key)); # xor with key
250 &xor ($s1,&DWP(4,$key));
251 &xor ($s2,&DWP(8,$key));
252 &xor ($s3,&DWP(12,$key));
253
254 &mov ($acc,&DWP(240,$key)); # load key->rounds
255
256 if ($small_footprint) {
257 &lea ($acc,&DWP(-2,$acc,$acc));
258 &lea ($acc,&DWP(0,$key,$acc,8));
259 &mov (&DWP(8,"esp"),$acc); # end of key schedule
260 &align (4);
261 &set_label("loop");
262 if ($vertical_spin) {
263 &encvert("ebp",$s0,$s1,$s2,$s3);
264 } else {
265 &encstep(0,"ebp",$s0,$s1,$s2,$s3);
266 &encstep(1,"ebp",$s1,$s2,$s3,$s0);
267 &encstep(2,"ebp",$s2,$s3,$s0,$s1);
268 &encstep(3,"ebp",$s3,$s0,$s1,$s2);
269 }
270 &add ($key,16); # advance rd_key
271 &xor ($s0,&DWP(0,$key));
272 &xor ($s1,&DWP(4,$key));
273 &xor ($s2,&DWP(8,$key));
274 &xor ($s3,&DWP(12,$key));
275 &cmp ($key,&DWP(8,"esp"));
276 &mov (&DWP(12,"esp"),$key);
277 &jb (&label("loop"));
278 }
279 else {
280 &cmp ($acc,10);
281 &jle (&label("10rounds"));
282 &cmp ($acc,12);
283 &jle (&label("12rounds"));
284
285 &set_label("14rounds");
286 for ($i=1;$i<3;$i++) {
287 if ($vertical_spin) {
288 &encvert("ebp",$s0,$s1,$s2,$s3);
289 } else {
290 &encstep(0,"ebp",$s0,$s1,$s2,$s3);
291 &encstep(1,"ebp",$s1,$s2,$s3,$s0);
292 &encstep(2,"ebp",$s2,$s3,$s0,$s1);
293 &encstep(3,"ebp",$s3,$s0,$s1,$s2);
294 }
295 &xor ($s0,&DWP(16*$i+0,$key));
296 &xor ($s1,&DWP(16*$i+4,$key));
297 &xor ($s2,&DWP(16*$i+8,$key));
298 &xor ($s3,&DWP(16*$i+12,$key));
299 }
300 &add ($key,32);
301 &mov (&DWP(12,"esp"),$key); # advance rd_key
302 &set_label("12rounds");
303 for ($i=1;$i<3;$i++) {
304 if ($vertical_spin) {
305 &encvert("ebp",$s0,$s1,$s2,$s3);
306 } else {
307 &encstep(0,"ebp",$s0,$s1,$s2,$s3);
308 &encstep(1,"ebp",$s1,$s2,$s3,$s0);
309 &encstep(2,"ebp",$s2,$s3,$s0,$s1);
310 &encstep(3,"ebp",$s3,$s0,$s1,$s2);
311 }
312 &xor ($s0,&DWP(16*$i+0,$key));
313 &xor ($s1,&DWP(16*$i+4,$key));
314 &xor ($s2,&DWP(16*$i+8,$key));
315 &xor ($s3,&DWP(16*$i+12,$key));
316 }
317 &add ($key,32);
318 &mov (&DWP(12,"esp"),$key); # advance rd_key
319 &set_label("10rounds");
320 for ($i=1;$i<10;$i++) {
321 if ($vertical_spin) {
322 &encvert("ebp",$s0,$s1,$s2,$s3);
323 } else {
324 &encstep(0,"ebp",$s0,$s1,$s2,$s3);
325 &encstep(1,"ebp",$s1,$s2,$s3,$s0);
326 &encstep(2,"ebp",$s2,$s3,$s0,$s1);
327 &encstep(3,"ebp",$s3,$s0,$s1,$s2);
328 }
329 &xor ($s0,&DWP(16*$i+0,$key));
330 &xor ($s1,&DWP(16*$i+4,$key));
331 &xor ($s2,&DWP(16*$i+8,$key));
332 &xor ($s3,&DWP(16*$i+12,$key));
333 }
334 }
335
336 if ($vertical_spin) {
337 # "reincarnate" some registers for "horizontal" spin...
338 &mov ($s1="ebx",$key="edi");
339 &mov ($s2="ecx",$acc="esi");
340 }
341 &enclast(0,"ebp",$s0,$s1,$s2,$s3);
342 &enclast(1,"ebp",$s1,$s2,$s3,$s0);
343 &enclast(2,"ebp",$s2,$s3,$s0,$s1);
344 &enclast(3,"ebp",$s3,$s0,$s1,$s2);
345
346 &mov ("esp",&DWP(16,"esp")); # restore %esp
347 &add ($key,$small_footprint?16:160);
348 &xor ($s0,&DWP(0,$key));
349 &xor ($s1,&DWP(4,$key));
350 &xor ($s2,&DWP(8,$key));
351 &xor ($s3,&DWP(12,$key));
352
353 &ret ();
354
355 &set_label("AES_Te",64); # Yes! I keep it in the code segment!
356 &_data_word(0xa56363c6, 0x847c7cf8, 0x997777ee, 0x8d7b7bf6);
357 &_data_word(0x0df2f2ff, 0xbd6b6bd6, 0xb16f6fde, 0x54c5c591);
358 &_data_word(0x50303060, 0x03010102, 0xa96767ce, 0x7d2b2b56);
359 &_data_word(0x19fefee7, 0x62d7d7b5, 0xe6abab4d, 0x9a7676ec);
360 &_data_word(0x45caca8f, 0x9d82821f, 0x40c9c989, 0x877d7dfa);
361 &_data_word(0x15fafaef, 0xeb5959b2, 0xc947478e, 0x0bf0f0fb);
362 &_data_word(0xecadad41, 0x67d4d4b3, 0xfda2a25f, 0xeaafaf45);
363 &_data_word(0xbf9c9c23, 0xf7a4a453, 0x967272e4, 0x5bc0c09b);
364 &_data_word(0xc2b7b775, 0x1cfdfde1, 0xae93933d, 0x6a26264c);
365 &_data_word(0x5a36366c, 0x413f3f7e, 0x02f7f7f5, 0x4fcccc83);
366 &_data_word(0x5c343468, 0xf4a5a551, 0x34e5e5d1, 0x08f1f1f9);
367 &_data_word(0x937171e2, 0x73d8d8ab, 0x53313162, 0x3f15152a);
368 &_data_word(0x0c040408, 0x52c7c795, 0x65232346, 0x5ec3c39d);
369 &_data_word(0x28181830, 0xa1969637, 0x0f05050a, 0xb59a9a2f);
370 &_data_word(0x0907070e, 0x36121224, 0x9b80801b, 0x3de2e2df);
371 &_data_word(0x26ebebcd, 0x6927274e, 0xcdb2b27f, 0x9f7575ea);
372 &_data_word(0x1b090912, 0x9e83831d, 0x742c2c58, 0x2e1a1a34);
373 &_data_word(0x2d1b1b36, 0xb26e6edc, 0xee5a5ab4, 0xfba0a05b);
374 &_data_word(0xf65252a4, 0x4d3b3b76, 0x61d6d6b7, 0xceb3b37d);
375 &_data_word(0x7b292952, 0x3ee3e3dd, 0x712f2f5e, 0x97848413);
376 &_data_word(0xf55353a6, 0x68d1d1b9, 0x00000000, 0x2cededc1);
377 &_data_word(0x60202040, 0x1ffcfce3, 0xc8b1b179, 0xed5b5bb6);
378 &_data_word(0xbe6a6ad4, 0x46cbcb8d, 0xd9bebe67, 0x4b393972);
379 &_data_word(0xde4a4a94, 0xd44c4c98, 0xe85858b0, 0x4acfcf85);
380 &_data_word(0x6bd0d0bb, 0x2aefefc5, 0xe5aaaa4f, 0x16fbfbed);
381 &_data_word(0xc5434386, 0xd74d4d9a, 0x55333366, 0x94858511);
382 &_data_word(0xcf45458a, 0x10f9f9e9, 0x06020204, 0x817f7ffe);
383 &_data_word(0xf05050a0, 0x443c3c78, 0xba9f9f25, 0xe3a8a84b);
384 &_data_word(0xf35151a2, 0xfea3a35d, 0xc0404080, 0x8a8f8f05);
385 &_data_word(0xad92923f, 0xbc9d9d21, 0x48383870, 0x04f5f5f1);
386 &_data_word(0xdfbcbc63, 0xc1b6b677, 0x75dadaaf, 0x63212142);
387 &_data_word(0x30101020, 0x1affffe5, 0x0ef3f3fd, 0x6dd2d2bf);
388 &_data_word(0x4ccdcd81, 0x140c0c18, 0x35131326, 0x2fececc3);
389 &_data_word(0xe15f5fbe, 0xa2979735, 0xcc444488, 0x3917172e);
390 &_data_word(0x57c4c493, 0xf2a7a755, 0x827e7efc, 0x473d3d7a);
391 &_data_word(0xac6464c8, 0xe75d5dba, 0x2b191932, 0x957373e6);
392 &_data_word(0xa06060c0, 0x98818119, 0xd14f4f9e, 0x7fdcdca3);
393 &_data_word(0x66222244, 0x7e2a2a54, 0xab90903b, 0x8388880b);
394 &_data_word(0xca46468c, 0x29eeeec7, 0xd3b8b86b, 0x3c141428);
395 &_data_word(0x79dedea7, 0xe25e5ebc, 0x1d0b0b16, 0x76dbdbad);
396 &_data_word(0x3be0e0db, 0x56323264, 0x4e3a3a74, 0x1e0a0a14);
397 &_data_word(0xdb494992, 0x0a06060c, 0x6c242448, 0xe45c5cb8);
398 &_data_word(0x5dc2c29f, 0x6ed3d3bd, 0xefacac43, 0xa66262c4);
399 &_data_word(0xa8919139, 0xa4959531, 0x37e4e4d3, 0x8b7979f2);
400 &_data_word(0x32e7e7d5, 0x43c8c88b, 0x5937376e, 0xb76d6dda);
401 &_data_word(0x8c8d8d01, 0x64d5d5b1, 0xd24e4e9c, 0xe0a9a949);
402 &_data_word(0xb46c6cd8, 0xfa5656ac, 0x07f4f4f3, 0x25eaeacf);
403 &_data_word(0xaf6565ca, 0x8e7a7af4, 0xe9aeae47, 0x18080810);
404 &_data_word(0xd5baba6f, 0x887878f0, 0x6f25254a, 0x722e2e5c);
405 &_data_word(0x241c1c38, 0xf1a6a657, 0xc7b4b473, 0x51c6c697);
406 &_data_word(0x23e8e8cb, 0x7cdddda1, 0x9c7474e8, 0x211f1f3e);
407 &_data_word(0xdd4b4b96, 0xdcbdbd61, 0x868b8b0d, 0x858a8a0f);
408 &_data_word(0x907070e0, 0x423e3e7c, 0xc4b5b571, 0xaa6666cc);
409 &_data_word(0xd8484890, 0x05030306, 0x01f6f6f7, 0x120e0e1c);
410 &_data_word(0xa36161c2, 0x5f35356a, 0xf95757ae, 0xd0b9b969);
411 &_data_word(0x91868617, 0x58c1c199, 0x271d1d3a, 0xb99e9e27);
412 &_data_word(0x38e1e1d9, 0x13f8f8eb, 0xb398982b, 0x33111122);
413 &_data_word(0xbb6969d2, 0x70d9d9a9, 0x898e8e07, 0xa7949433);
414 &_data_word(0xb69b9b2d, 0x221e1e3c, 0x92878715, 0x20e9e9c9);
415 &_data_word(0x49cece87, 0xff5555aa, 0x78282850, 0x7adfdfa5);
416 &_data_word(0x8f8c8c03, 0xf8a1a159, 0x80898909, 0x170d0d1a);
417 &_data_word(0xdabfbf65, 0x31e6e6d7, 0xc6424284, 0xb86868d0);
418 &_data_word(0xc3414182, 0xb0999929, 0x772d2d5a, 0x110f0f1e);
419 &_data_word(0xcbb0b07b, 0xfc5454a8, 0xd6bbbb6d, 0x3a16162c);
420 #rcon:
421 &data_word(0x00000001, 0x00000002, 0x00000004, 0x00000008);
422 &data_word(0x00000010, 0x00000020, 0x00000040, 0x00000080);
423 &data_word(0x0000001b, 0x00000036);
424 &function_end_B("_x86_AES_encrypt");
425
426 # void AES_encrypt (const void *inp,void *out,const AES_KEY *key);
427 &public_label("AES_Te");
428 &function_begin("AES_encrypt");
429 &mov ($acc,&wparam(0)); # load inp
430 &mov ($key,&wparam(2)); # load key
431
432 &call (&label("pic_point")); # make it PIC!
433 &set_label("pic_point");
434 &blindpop("ebp");
435 &lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
436
437 &mov ($s0,&DWP(0,$acc)); # load input data
438 &mov ($s1,&DWP(4,$acc));
439 &mov ($s2,&DWP(8,$acc));
440 &mov ($s3,&DWP(12,$acc));
441
442 &call ("_x86_AES_encrypt");
443
444 &mov ($acc,&wparam(1)); # load out
445 &mov (&DWP(0,$acc),$s0); # write output data
446 &mov (&DWP(4,$acc),$s1);
447 &mov (&DWP(8,$acc),$s2);
448 &mov (&DWP(12,$acc),$s3);
449 &function_end("AES_encrypt");
450
451 #------------------------------------------------------------------#
452
453 sub decstep()
454 { my ($i,$td,@s) = @_;
455 my $tmp = $key;
456 my $out = $i==3?$s[0]:$acc;
457
458 # no instructions are reordered, as performance appears
459 # optimal... or rather that all attempts to reorder didn't
460 # result in better performance [which by the way is not a
461 # bit lower than ecryption].
462 if($i==3) { &mov ($key,&DWP(12,"esp")); }
463 else { &mov ($out,$s[0]); }
464 &and ($out,0xFF);
465 &mov ($out,&DWP(0,$td,$out,8));
466
467 if ($i==3) { $tmp=$s[1]; }
468 &movz ($tmp,&HB($s[1]));
469 &xor ($out,&DWP(3,$td,$tmp,8));
470
471 if ($i==3) { $tmp=$s[2]; &mov ($s[1],$acc); }
472 else { &mov ($tmp,$s[2]); }
473 &shr ($tmp,16);
474 &and ($tmp,0xFF);
475 &xor ($out,&DWP(2,$td,$tmp,8));
476
477 if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }
478 else { &mov ($tmp,$s[3]); }
479 &shr ($tmp,24);
480 &xor ($out,&DWP(1,$td,$tmp,8));
481 if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
482 if ($i==3) { &mov ($s[3],&DWP(0,"esp")); }
483 &comment();
484 }
485
486 sub declast()
487 { my ($i,$td,@s)=@_;
488 my $tmp = $key;
489 my $out = $i==3?$s[0]:$acc;
490
491 if($i==3) { &mov ($key,&DWP(12,"esp")); }
492 else { &mov ($out,$s[0]); }
493 &and ($out,0xFF);
494 &mov ($out,&DWP(2048,$td,$out,4));
495 &and ($out,0x000000ff);
496
497 if ($i==3) { $tmp=$s[1]; }
498 &movz ($tmp,&HB($s[1]));
499 &mov ($tmp,&DWP(2048,$td,$tmp,4));
500 &and ($tmp,0x0000ff00);
501 &xor ($out,$tmp);
502
503 if ($i==3) { $tmp=$s[2]; &mov ($s[1],$acc); }
504 else { mov ($tmp,$s[2]); }
505 &shr ($tmp,16);
506 &and ($tmp,0xFF);
507 &mov ($tmp,&DWP(2048,$td,$tmp,4));
508 &and ($tmp,0x00ff0000);
509 &xor ($out,$tmp);
510
511 if ($i==3) { $tmp=$s[3]; &mov ($s[2],&DWP(4,"esp")); }
512 else { &mov ($tmp,$s[3]); }
513 &shr ($tmp,24);
514 &mov ($tmp,&DWP(2048,$td,$tmp,4));
515 &and ($tmp,0xff000000);
516 &xor ($out,$tmp);
517 if ($i<2) { &mov (&DWP(4*$i,"esp"),$out); }
518 if ($i==3) { &mov ($s[3],&DWP(0,"esp")); }
519 }
520
521 &public_label("AES_Td");
522 &function_begin_B("_x86_AES_decrypt");
523 # allocate aligned stack frame
524 &mov ($acc,"esp");
525 &sub ("esp",20);
526 &and ("esp",-16);
527
528 &mov (&DWP(12,"esp"),$key); # save key
529 &mov (&DWP(16,"esp"),$acc); # save %esp
530
531 &xor ($s0,&DWP(0,$key)); # xor with key
532 &xor ($s1,&DWP(4,$key));
533 &xor ($s2,&DWP(8,$key));
534 &xor ($s3,&DWP(12,$key));
535
536 &mov ($acc,&DWP(240,$key)); # load key->rounds
537
538 if ($small_footprint) {
539 &lea ($acc,&DWP(-2,$acc,$acc));
540 &lea ($acc,&DWP(0,$key,$acc,8));
541 &mov (&DWP(8,"esp"),$acc); # end of key schedule
542 &align (4);
543 &set_label("loop");
544 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
545 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
546 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
547 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
548 &add ($key,16); # advance rd_key
549 &xor ($s0,&DWP(0,$key));
550 &xor ($s1,&DWP(4,$key));
551 &xor ($s2,&DWP(8,$key));
552 &xor ($s3,&DWP(12,$key));
553 &cmp ($key,&DWP(8,"esp"));
554 &mov (&DWP(12,"esp"),$key);
555 &jb (&label("loop"));
556 }
557 else {
558 &cmp ($acc,10);
559 &jle (&label("10rounds"));
560 &cmp ($acc,12);
561 &jle (&label("12rounds"));
562
563 &set_label("14rounds");
564 for ($i=1;$i<3;$i++) {
565 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
566 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
567 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
568 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
569 &xor ($s0,&DWP(16*$i+0,$key));
570 &xor ($s1,&DWP(16*$i+4,$key));
571 &xor ($s2,&DWP(16*$i+8,$key));
572 &xor ($s3,&DWP(16*$i+12,$key));
573 }
574 &add ($key,32);
575 &mov (&DWP(12,"esp"),$key); # advance rd_key
576 &set_label("12rounds");
577 for ($i=1;$i<3;$i++) {
578 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
579 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
580 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
581 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
582 &xor ($s0,&DWP(16*$i+0,$key));
583 &xor ($s1,&DWP(16*$i+4,$key));
584 &xor ($s2,&DWP(16*$i+8,$key));
585 &xor ($s3,&DWP(16*$i+12,$key));
586 }
587 &add ($key,32);
588 &mov (&DWP(12,"esp"),$key); # advance rd_key
589 &set_label("10rounds");
590 for ($i=1;$i<10;$i++) {
591 &decstep(0,"ebp",$s0,$s3,$s2,$s1);
592 &decstep(1,"ebp",$s1,$s0,$s3,$s2);
593 &decstep(2,"ebp",$s2,$s1,$s0,$s3);
594 &decstep(3,"ebp",$s3,$s2,$s1,$s0);
595 &xor ($s0,&DWP(16*$i+0,$key));
596 &xor ($s1,&DWP(16*$i+4,$key));
597 &xor ($s2,&DWP(16*$i+8,$key));
598 &xor ($s3,&DWP(16*$i+12,$key));
599 }
600 }
601
602 &declast(0,"ebp",$s0,$s3,$s2,$s1);
603 &declast(1,"ebp",$s1,$s0,$s3,$s2);
604 &declast(2,"ebp",$s2,$s1,$s0,$s3);
605 &declast(3,"ebp",$s3,$s2,$s1,$s0);
606
607 &mov ("esp",&DWP(16,"esp")); # restore %esp
608 &add ($key,$small_footprint?16:160);
609 &xor ($s0,&DWP(0,$key));
610 &xor ($s1,&DWP(4,$key));
611 &xor ($s2,&DWP(8,$key));
612 &xor ($s3,&DWP(12,$key));
613
614 &ret ();
615
616 &set_label("AES_Td",64); # Yes! I keep it in the code segment!
617 &_data_word(0x50a7f451, 0x5365417e, 0xc3a4171a, 0x965e273a);
618 &_data_word(0xcb6bab3b, 0xf1459d1f, 0xab58faac, 0x9303e34b);
619 &_data_word(0x55fa3020, 0xf66d76ad, 0x9176cc88, 0x254c02f5);
620 &_data_word(0xfcd7e54f, 0xd7cb2ac5, 0x80443526, 0x8fa362b5);
621 &_data_word(0x495ab1de, 0x671bba25, 0x980eea45, 0xe1c0fe5d);
622 &_data_word(0x02752fc3, 0x12f04c81, 0xa397468d, 0xc6f9d36b);
623 &_data_word(0xe75f8f03, 0x959c9215, 0xeb7a6dbf, 0xda595295);
624 &_data_word(0x2d83bed4, 0xd3217458, 0x2969e049, 0x44c8c98e);
625 &_data_word(0x6a89c275, 0x78798ef4, 0x6b3e5899, 0xdd71b927);
626 &_data_word(0xb64fe1be, 0x17ad88f0, 0x66ac20c9, 0xb43ace7d);
627 &_data_word(0x184adf63, 0x82311ae5, 0x60335197, 0x457f5362);
628 &_data_word(0xe07764b1, 0x84ae6bbb, 0x1ca081fe, 0x942b08f9);
629 &_data_word(0x58684870, 0x19fd458f, 0x876cde94, 0xb7f87b52);
630 &_data_word(0x23d373ab, 0xe2024b72, 0x578f1fe3, 0x2aab5566);
631 &_data_word(0x0728ebb2, 0x03c2b52f, 0x9a7bc586, 0xa50837d3);
632 &_data_word(0xf2872830, 0xb2a5bf23, 0xba6a0302, 0x5c8216ed);
633 &_data_word(0x2b1ccf8a, 0x92b479a7, 0xf0f207f3, 0xa1e2694e);
634 &_data_word(0xcdf4da65, 0xd5be0506, 0x1f6234d1, 0x8afea6c4);
635 &_data_word(0x9d532e34, 0xa055f3a2, 0x32e18a05, 0x75ebf6a4);
636 &_data_word(0x39ec830b, 0xaaef6040, 0x069f715e, 0x51106ebd);
637 &_data_word(0xf98a213e, 0x3d06dd96, 0xae053edd, 0x46bde64d);
638 &_data_word(0xb58d5491, 0x055dc471, 0x6fd40604, 0xff155060);
639 &_data_word(0x24fb9819, 0x97e9bdd6, 0xcc434089, 0x779ed967);
640 &_data_word(0xbd42e8b0, 0x888b8907, 0x385b19e7, 0xdbeec879);
641 &_data_word(0x470a7ca1, 0xe90f427c, 0xc91e84f8, 0x00000000);
642 &_data_word(0x83868009, 0x48ed2b32, 0xac70111e, 0x4e725a6c);
643 &_data_word(0xfbff0efd, 0x5638850f, 0x1ed5ae3d, 0x27392d36);
644 &_data_word(0x64d90f0a, 0x21a65c68, 0xd1545b9b, 0x3a2e3624);
645 &_data_word(0xb1670a0c, 0x0fe75793, 0xd296eeb4, 0x9e919b1b);
646 &_data_word(0x4fc5c080, 0xa220dc61, 0x694b775a, 0x161a121c);
647 &_data_word(0x0aba93e2, 0xe52aa0c0, 0x43e0223c, 0x1d171b12);
648 &_data_word(0x0b0d090e, 0xadc78bf2, 0xb9a8b62d, 0xc8a91e14);
649 &_data_word(0x8519f157, 0x4c0775af, 0xbbdd99ee, 0xfd607fa3);
650 &_data_word(0x9f2601f7, 0xbcf5725c, 0xc53b6644, 0x347efb5b);
651 &_data_word(0x7629438b, 0xdcc623cb, 0x68fcedb6, 0x63f1e4b8);
652 &_data_word(0xcadc31d7, 0x10856342, 0x40229713, 0x2011c684);
653 &_data_word(0x7d244a85, 0xf83dbbd2, 0x1132f9ae, 0x6da129c7);
654 &_data_word(0x4b2f9e1d, 0xf330b2dc, 0xec52860d, 0xd0e3c177);
655 &_data_word(0x6c16b32b, 0x99b970a9, 0xfa489411, 0x2264e947);
656 &_data_word(0xc48cfca8, 0x1a3ff0a0, 0xd82c7d56, 0xef903322);
657 &_data_word(0xc74e4987, 0xc1d138d9, 0xfea2ca8c, 0x360bd498);
658 &_data_word(0xcf81f5a6, 0x28de7aa5, 0x268eb7da, 0xa4bfad3f);
659 &_data_word(0xe49d3a2c, 0x0d927850, 0x9bcc5f6a, 0x62467e54);
660 &_data_word(0xc2138df6, 0xe8b8d890, 0x5ef7392e, 0xf5afc382);
661 &_data_word(0xbe805d9f, 0x7c93d069, 0xa92dd56f, 0xb31225cf);
662 &_data_word(0x3b99acc8, 0xa77d1810, 0x6e639ce8, 0x7bbb3bdb);
663 &_data_word(0x097826cd, 0xf418596e, 0x01b79aec, 0xa89a4f83);
664 &_data_word(0x656e95e6, 0x7ee6ffaa, 0x08cfbc21, 0xe6e815ef);
665 &_data_word(0xd99be7ba, 0xce366f4a, 0xd4099fea, 0xd67cb029);
666 &_data_word(0xafb2a431, 0x31233f2a, 0x3094a5c6, 0xc066a235);
667 &_data_word(0x37bc4e74, 0xa6ca82fc, 0xb0d090e0, 0x15d8a733);
668 &_data_word(0x4a9804f1, 0xf7daec41, 0x0e50cd7f, 0x2ff69117);
669 &_data_word(0x8dd64d76, 0x4db0ef43, 0x544daacc, 0xdf0496e4);
670 &_data_word(0xe3b5d19e, 0x1b886a4c, 0xb81f2cc1, 0x7f516546);
671 &_data_word(0x04ea5e9d, 0x5d358c01, 0x737487fa, 0x2e410bfb);
672 &_data_word(0x5a1d67b3, 0x52d2db92, 0x335610e9, 0x1347d66d);
673 &_data_word(0x8c61d79a, 0x7a0ca137, 0x8e14f859, 0x893c13eb);
674 &_data_word(0xee27a9ce, 0x35c961b7, 0xede51ce1, 0x3cb1477a);
675 &_data_word(0x59dfd29c, 0x3f73f255, 0x79ce1418, 0xbf37c773);
676 &_data_word(0xeacdf753, 0x5baafd5f, 0x146f3ddf, 0x86db4478);
677 &_data_word(0x81f3afca, 0x3ec468b9, 0x2c342438, 0x5f40a3c2);
678 &_data_word(0x72c31d16, 0x0c25e2bc, 0x8b493c28, 0x41950dff);
679 &_data_word(0x7101a839, 0xdeb30c08, 0x9ce4b4d8, 0x90c15664);
680 &_data_word(0x6184cb7b, 0x70b632d5, 0x745c6c48, 0x4257b8d0);
681 #Td4:
682 &data_word(0x52525252, 0x09090909, 0x6a6a6a6a, 0xd5d5d5d5);
683 &data_word(0x30303030, 0x36363636, 0xa5a5a5a5, 0x38383838);
684 &data_word(0xbfbfbfbf, 0x40404040, 0xa3a3a3a3, 0x9e9e9e9e);
685 &data_word(0x81818181, 0xf3f3f3f3, 0xd7d7d7d7, 0xfbfbfbfb);
686 &data_word(0x7c7c7c7c, 0xe3e3e3e3, 0x39393939, 0x82828282);
687 &data_word(0x9b9b9b9b, 0x2f2f2f2f, 0xffffffff, 0x87878787);
688 &data_word(0x34343434, 0x8e8e8e8e, 0x43434343, 0x44444444);
689 &data_word(0xc4c4c4c4, 0xdededede, 0xe9e9e9e9, 0xcbcbcbcb);
690 &data_word(0x54545454, 0x7b7b7b7b, 0x94949494, 0x32323232);
691 &data_word(0xa6a6a6a6, 0xc2c2c2c2, 0x23232323, 0x3d3d3d3d);
692 &data_word(0xeeeeeeee, 0x4c4c4c4c, 0x95959595, 0x0b0b0b0b);
693 &data_word(0x42424242, 0xfafafafa, 0xc3c3c3c3, 0x4e4e4e4e);
694 &data_word(0x08080808, 0x2e2e2e2e, 0xa1a1a1a1, 0x66666666);
695 &data_word(0x28282828, 0xd9d9d9d9, 0x24242424, 0xb2b2b2b2);
696 &data_word(0x76767676, 0x5b5b5b5b, 0xa2a2a2a2, 0x49494949);
697 &data_word(0x6d6d6d6d, 0x8b8b8b8b, 0xd1d1d1d1, 0x25252525);
698 &data_word(0x72727272, 0xf8f8f8f8, 0xf6f6f6f6, 0x64646464);
699 &data_word(0x86868686, 0x68686868, 0x98989898, 0x16161616);
700 &data_word(0xd4d4d4d4, 0xa4a4a4a4, 0x5c5c5c5c, 0xcccccccc);
701 &data_word(0x5d5d5d5d, 0x65656565, 0xb6b6b6b6, 0x92929292);
702 &data_word(0x6c6c6c6c, 0x70707070, 0x48484848, 0x50505050);
703 &data_word(0xfdfdfdfd, 0xedededed, 0xb9b9b9b9, 0xdadadada);
704 &data_word(0x5e5e5e5e, 0x15151515, 0x46464646, 0x57575757);
705 &data_word(0xa7a7a7a7, 0x8d8d8d8d, 0x9d9d9d9d, 0x84848484);
706 &data_word(0x90909090, 0xd8d8d8d8, 0xabababab, 0x00000000);
707 &data_word(0x8c8c8c8c, 0xbcbcbcbc, 0xd3d3d3d3, 0x0a0a0a0a);
708 &data_word(0xf7f7f7f7, 0xe4e4e4e4, 0x58585858, 0x05050505);
709 &data_word(0xb8b8b8b8, 0xb3b3b3b3, 0x45454545, 0x06060606);
710 &data_word(0xd0d0d0d0, 0x2c2c2c2c, 0x1e1e1e1e, 0x8f8f8f8f);
711 &data_word(0xcacacaca, 0x3f3f3f3f, 0x0f0f0f0f, 0x02020202);
712 &data_word(0xc1c1c1c1, 0xafafafaf, 0xbdbdbdbd, 0x03030303);
713 &data_word(0x01010101, 0x13131313, 0x8a8a8a8a, 0x6b6b6b6b);
714 &data_word(0x3a3a3a3a, 0x91919191, 0x11111111, 0x41414141);
715 &data_word(0x4f4f4f4f, 0x67676767, 0xdcdcdcdc, 0xeaeaeaea);
716 &data_word(0x97979797, 0xf2f2f2f2, 0xcfcfcfcf, 0xcececece);
717 &data_word(0xf0f0f0f0, 0xb4b4b4b4, 0xe6e6e6e6, 0x73737373);
718 &data_word(0x96969696, 0xacacacac, 0x74747474, 0x22222222);
719 &data_word(0xe7e7e7e7, 0xadadadad, 0x35353535, 0x85858585);
720 &data_word(0xe2e2e2e2, 0xf9f9f9f9, 0x37373737, 0xe8e8e8e8);
721 &data_word(0x1c1c1c1c, 0x75757575, 0xdfdfdfdf, 0x6e6e6e6e);
722 &data_word(0x47474747, 0xf1f1f1f1, 0x1a1a1a1a, 0x71717171);
723 &data_word(0x1d1d1d1d, 0x29292929, 0xc5c5c5c5, 0x89898989);
724 &data_word(0x6f6f6f6f, 0xb7b7b7b7, 0x62626262, 0x0e0e0e0e);
725 &data_word(0xaaaaaaaa, 0x18181818, 0xbebebebe, 0x1b1b1b1b);
726 &data_word(0xfcfcfcfc, 0x56565656, 0x3e3e3e3e, 0x4b4b4b4b);
727 &data_word(0xc6c6c6c6, 0xd2d2d2d2, 0x79797979, 0x20202020);
728 &data_word(0x9a9a9a9a, 0xdbdbdbdb, 0xc0c0c0c0, 0xfefefefe);
729 &data_word(0x78787878, 0xcdcdcdcd, 0x5a5a5a5a, 0xf4f4f4f4);
730 &data_word(0x1f1f1f1f, 0xdddddddd, 0xa8a8a8a8, 0x33333333);
731 &data_word(0x88888888, 0x07070707, 0xc7c7c7c7, 0x31313131);
732 &data_word(0xb1b1b1b1, 0x12121212, 0x10101010, 0x59595959);
733 &data_word(0x27272727, 0x80808080, 0xecececec, 0x5f5f5f5f);
734 &data_word(0x60606060, 0x51515151, 0x7f7f7f7f, 0xa9a9a9a9);
735 &data_word(0x19191919, 0xb5b5b5b5, 0x4a4a4a4a, 0x0d0d0d0d);
736 &data_word(0x2d2d2d2d, 0xe5e5e5e5, 0x7a7a7a7a, 0x9f9f9f9f);
737 &data_word(0x93939393, 0xc9c9c9c9, 0x9c9c9c9c, 0xefefefef);
738 &data_word(0xa0a0a0a0, 0xe0e0e0e0, 0x3b3b3b3b, 0x4d4d4d4d);
739 &data_word(0xaeaeaeae, 0x2a2a2a2a, 0xf5f5f5f5, 0xb0b0b0b0);
740 &data_word(0xc8c8c8c8, 0xebebebeb, 0xbbbbbbbb, 0x3c3c3c3c);
741 &data_word(0x83838383, 0x53535353, 0x99999999, 0x61616161);
742 &data_word(0x17171717, 0x2b2b2b2b, 0x04040404, 0x7e7e7e7e);
743 &data_word(0xbabababa, 0x77777777, 0xd6d6d6d6, 0x26262626);
744 &data_word(0xe1e1e1e1, 0x69696969, 0x14141414, 0x63636363);
745 &data_word(0x55555555, 0x21212121, 0x0c0c0c0c, 0x7d7d7d7d);
746 &function_end_B("_x86_AES_decrypt");
747
748 # void AES_decrypt (const void *inp,void *out,const AES_KEY *key);
749 &public_label("AES_Td");
750 &function_begin("AES_decrypt");
751 &mov ($acc,&wparam(0)); # load inp
752 &mov ($key,&wparam(2)); # load key
753
754 &call (&label("pic_point")); # make it PIC!
755 &set_label("pic_point");
756 &blindpop("ebp");
757 &lea ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"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 ($acc,&wparam(1)); # load out
767 &mov (&DWP(0,$acc),$s0); # write output data
768 &mov (&DWP(4,$acc),$s1);
769 &mov (&DWP(8,$acc),$s2);
770 &mov (&DWP(12,$acc),$s3);
771 &function_end("AES_decrypt");
772
773 # void AES_cbc_encrypt (const void char *inp, unsigned char *out,
774 # size_t length, const AES_KEY *key,
775 # unsigned char *ivp,const int enc);
776 &public_label("AES_Te");
777 &public_label("AES_Td");
778 &function_begin("AES_cbc_encrypt");
779 &mov ($s2 eq "ecx"? $s2 : "",&wparam(2)); # load len
780 &cmp ($s2,0);
781 &je (&label("enc_out"));
782
783 &call (&label("pic_point")); # make it PIC!
784 &set_label("pic_point");
785 &blindpop("ebp");
786
787 &cmp (&wparam(5),0);
788 &je (&label("DECRYPT"));
789
790 &lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
791
792 &mov ($acc,&wparam(0)); # load inp
793 &mov ($key,&wparam(4)); # load ivp
794
795 &test ($s2,0xFFFFFFF0);
796 &jz (&label("enc_tail")); # short input...
797
798 # prefetch AES_Te
799 for ($i=0;$i<2048;$i+=128)
800 { &mov ($s0,&DWP($i+0,"ebp"));
801 &mov ($s1,&DWP($i+32,"ebp"));
802 &mov ($s2,&DWP($i+64,"ebp"));
803 &mov ($s3,&DWP($i+96,"ebp"));
804 }
805
806 &mov ($s0,&DWP(0,$key)); # load iv
807 &mov ($s1,&DWP(4,$key));
808
809 &align (4);
810 &set_label("enc_loop");
811 &mov ($s2,&DWP(8,$key));
812 &mov ($s3,&DWP(12,$key));
813
814 &xor ($s0,&DWP(0,$acc)); # xor input data
815 &xor ($s1,&DWP(4,$acc));
816 &xor ($s2,&DWP(8,$acc));
817 &xor ($s3,&DWP(12,$acc));
818
819 &mov ($key,&wparam(3)); # load key
820 &call ("_x86_AES_encrypt");
821
822 &mov ($acc,&wparam(0)); # load inp
823 &mov ($key,&wparam(1)); # load out
824
825 &mov (&DWP(0,$key),$s0); # save output data
826 &mov (&DWP(4,$key),$s1);
827 &mov (&DWP(8,$key),$s2);
828 &mov (&DWP(12,$key),$s3);
829
830 &mov ($s2,&wparam(2)); # load len
831
832 &lea ($acc,&DWP(16,$acc));
833 &mov (&wparam(0),$acc); # save inp
834
835 &lea ($s3,&DWP(16,$key));
836 &mov (&wparam(1),$s3); # save out
837
838 &sub ($s2,16);
839 &test ($s2,0xFFFFFFF0);
840 &mov (&wparam(2),$s2); # save len
841 &jnz (&label("enc_loop"));
842 &test ($s2,15);
843 &jnz (&label("enc_tail"));
844 &mov ($acc,&wparam(4)); # load ivp
845 &mov ($s2,&DWP(8,$key)); # restore last dwords
846 &mov ($s3,&DWP(12,$key));
847 &mov (&DWP(0,$acc),$s0); # save iv
848 &mov (&DWP(4,$acc),$s1);
849 &mov (&DWP(8,$acc),$s2);
850 &mov (&DWP(12,$acc),$s3);
851 &set_label("enc_out");
852 &function_end_A();
853
854 &align (4);
855 &set_label("enc_tail");
856 &push ($key eq "edi" ? $key : ""); # push ivp
857 &pushf ();
858 &mov ($key,&wparam(1)); # load out
859 &mov ($s1,16);
860 &sub ($s1,$s2);
861 &cmp ($key,$acc); # compare with inp
862 &je (&label("enc_in_place"));
863 &data_word(0x90A4F3FC); # cld; rep movsb; nop # copy input
864 &jmp (&label("enc_skip_in_place"));
865 &set_label("enc_in_place");
866 &lea ($key,&DWP(0,$key,$s2));
867 &set_label("enc_skip_in_place");
868 &mov ($s2,$s1);
869 &xor ($s0,$s0);
870 &data_word(0x90AAF3FC); # cld; rep stosb; nop # zero tail
871 &popf ();
872 &pop ($key); # pop ivp
873
874 # prefetch AES_Te
875 for ($i=0;$i<2048;$i+=128)
876 { &mov ($s0,&DWP($i+0,"ebp"));
877 &mov ($s1,&DWP($i+32,"ebp"));
878 &mov ($s2,&DWP($i+64,"ebp"));
879 &mov ($s3,&DWP($i+96,"ebp"));
880 }
881
882 &mov ($acc,&wparam(1)); # output as input
883 &mov ($s0,&DWP(0,$key));
884 &mov ($s1,&DWP(4,$key));
885 &mov (&wparam(2),16); # len=16
886 &jmp (&label("enc_loop")); # one more spin...
887
888 #----------------------------- DECRYPT -----------------------------#
889 &align (4);
890 &set_label("DECRYPT");
891 &stack_push(5); # allocate temp + ivp
892
893 &lea ("ebp",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
894
895 # prefetch AES_Td
896 for ($i=0;$i<3072;$i+=128)
897 { &mov ($s0,&DWP($i+0,"ebp"));
898 &mov ($s1,&DWP($i+32,"ebp"));
899 &mov ($s2,&DWP($i+64,"ebp"));
900 &mov ($s3,&DWP($i+96,"ebp"));
901 }
902
903 &mov ($acc,&wparam(0)); # load inp
904 &cmp ($acc,&wparam(1));
905 &je (&label("dec_in_place")); # in-place processing...
906
907 &mov ($key,&wparam(4)); # load ivp
908 &mov (&swtmp(4),$key);
909
910 &align (4);
911 &set_label("dec_loop");
912 &mov ($s0,&DWP(0,$acc)); # read input
913 &mov ($s1,&DWP(4,$acc));
914 &mov ($s2,&DWP(8,$acc));
915 &mov ($s3,&DWP(12,$acc));
916
917 &mov ($key,&wparam(3)); # load key
918 &call ("_x86_AES_decrypt");
919
920 &mov ($key,&swtmp(4)); # load ivp
921 &mov ($acc,&wparam(2)); # load len
922 &xor ($s0,&DWP(0,$key)); # xor iv
923 &xor ($s1,&DWP(4,$key));
924 &xor ($s2,&DWP(8,$key));
925 &xor ($s3,&DWP(12,$key));
926
927 &sub ($acc,16);
928 &jc (&label("dec_partial"));
929 &mov (&wparam(2),$acc); # save len
930 &mov ($acc,&wparam(0)); # load inp
931 &mov ($key,&wparam(1)); # load out
932
933 &mov (&DWP(0,$key),$s0); # write output
934 &mov (&DWP(4,$key),$s1);
935 &mov (&DWP(8,$key),$s2);
936 &mov (&DWP(12,$key),$s3);
937
938 &mov (&swtmp(4),$acc); # save ivp
939 &lea ($acc,&DWP(16,$acc));
940 &mov (&wparam(0),$acc); # save inp
941
942 &lea ($key,&DWP(16,$key));
943 &mov (&wparam(1),$key); # save out
944
945 &jnz (&label("dec_loop"));
946 &mov ($key,&swtmp(4)); # load temp ivp
947 &set_label("dec_end");
948 &mov ($acc,&wparam(4)); # load user ivp
949 &mov ($s0,&DWP(0,$key)); # load iv
950 &mov ($s1,&DWP(4,$key));
951 &mov ($s2,&DWP(8,$key));
952 &mov ($s3,&DWP(12,$key));
953 &mov (&DWP(0,$acc),$s0); # copy back to user
954 &mov (&DWP(4,$acc),$s1);
955 &mov (&DWP(8,$acc),$s2);
956 &mov (&DWP(12,$acc),$s3);
957 &jmp (&label("dec_out"));
958
959 &align (4);
960 &set_label("dec_partial");
961 &lea ($key,&swtmp(0));
962 &mov (&DWP(0,$key),$s0); # dump output to stack
963 &mov (&DWP(4,$key),$s1);
964 &mov (&DWP(8,$key),$s2);
965 &mov (&DWP(12,$key),$s3);
966 &lea ($s2 eq "ecx" ? $s2 : "",&DWP(16,$acc));
967 &mov ($acc eq "esi" ? $acc : "",$key);
968 &mov ($key eq "edi" ? $key : "",&wparam(1));
969 &pushf ();
970 &data_word(0x90A4F3FC); # cld; rep movsb; nop # copy output
971 &popf ();
972 &mov ($key,&wparam(0)); # load temp ivp
973 &jmp (&label("dec_end"));
974
975 &align (4);
976 &set_label("dec_in_place");
977 &set_label("dec_in_place_loop");
978 &lea ($key,&swtmp(0));
979 &mov ($s0,&DWP(0,$acc)); # read input
980 &mov ($s1,&DWP(4,$acc));
981 &mov ($s2,&DWP(8,$acc));
982 &mov ($s3,&DWP(12,$acc));
983
984 &mov (&DWP(0,$key),$s0); # copy to temp
985 &mov (&DWP(4,$key),$s1);
986 &mov (&DWP(8,$key),$s2);
987 &mov (&DWP(12,$key),$s3);
988
989 &mov ($key,&wparam(3)); # load key
990 &call ("_x86_AES_decrypt");
991
992 &mov ($key,&wparam(4)); # load ivp
993 &mov ($acc,&wparam(1)); # load out
994 &xor ($s0,&DWP(0,$key)); # xor iv
995 &xor ($s1,&DWP(4,$key));
996 &xor ($s2,&DWP(8,$key));
997 &xor ($s3,&DWP(12,$key));
998
999 &mov (&DWP(0,$acc),$s0); # write output
1000 &mov (&DWP(4,$acc),$s1);
1001 &mov (&DWP(8,$acc),$s2);
1002 &mov (&DWP(12,$acc),$s3);
1003
1004 &lea ($acc,&DWP(16,$acc));
1005 &mov (&wparam(1),$acc); # save out
1006
1007 &lea ($acc,&swtmp(0));
1008 &mov ($s0,&DWP(0,$acc)); # read temp
1009 &mov ($s1,&DWP(4,$acc));
1010 &mov ($s2,&DWP(8,$acc));
1011 &mov ($s3,&DWP(12,$acc));
1012
1013 &mov (&DWP(0,$key),$s0); # copy iv
1014 &mov (&DWP(4,$key),$s1);
1015 &mov (&DWP(8,$key),$s2);
1016 &mov (&DWP(12,$key),$s3);
1017
1018 &mov ($acc,&wparam(0)); # load inp
1019
1020 &lea ($acc,&DWP(16,$acc));
1021 &mov (&wparam(0),$acc); # save inp
1022
1023 &mov ($s2,&wparam(2)); # load len
1024 &sub ($s2,16);
1025 &jc (&label("dec_in_place_partial"));
1026 &mov (&wparam(2),$s2); # save len
1027 &jnz (&label("dec_in_place_loop"));
1028 &jmp (&label("dec_out"));
1029
1030 &align (4);
1031 &set_label("dec_in_place_partial");
1032 # one can argue if this is actually required...
1033 &mov ($key eq "edi" ? $key : "",&wparam(1));
1034 &lea ($acc eq "esi" ? $acc : "",&swtmp(0));
1035 &lea ($key,&DWP(0,$key,$s2));
1036 &lea ($acc,&DWP(16,$acc,$s2));
1037 &neg ($s2 eq "ecx" ? $s2 : "");
1038 &pushf ();
1039 &data_word(0x90A4F3FC); # cld; rep movsb; nop # restore tail
1040 &popf ();
1041
1042 &align (4);
1043 &set_label("dec_out");
1044 &stack_pop(5);
1045 &function_end("AES_cbc_encrypt");
1046
1047 #------------------------------------------------------------------#
1048
1049 sub enckey()
1050 {
1051 &movz ("esi",&LB("edx")); # rk[i]>>0
1052 &mov ("ebx",&DWP(2,"ebp","esi",8));
1053 &movz ("esi",&HB("edx")); # rk[i]>>8
1054 &and ("ebx",0xFF000000);
1055 &xor ("eax","ebx");
1056
1057 &mov ("ebx",&DWP(2,"ebp","esi",8));
1058 &shr ("edx",16);
1059 &and ("ebx",0x000000FF);
1060 &movz ("esi",&LB("edx")); # rk[i]>>16
1061 &xor ("eax","ebx");
1062
1063 &mov ("ebx",&DWP(0,"ebp","esi",8));
1064 &movz ("esi",&HB("edx")); # rk[i]>>24
1065 &and ("ebx",0x0000FF00);
1066 &xor ("eax","ebx");
1067
1068 &mov ("ebx",&DWP(0,"ebp","esi",8));
1069 &and ("ebx",0x00FF0000);
1070 &xor ("eax","ebx");
1071
1072 &xor ("eax",&DWP(2048,"ebp","ecx",4)); # rcon
1073 }
1074
1075 # int AES_set_encrypt_key(const unsigned char *userKey, const int bits,
1076 # AES_KEY *key)
1077 &public_label("AES_Te");
1078 &function_begin("AES_set_encrypt_key");
1079 &mov ("esi",&wparam(0)); # user supplied key
1080 &mov ("edi",&wparam(2)); # private key schedule
1081
1082 &test ("esi",-1);
1083 &jz (&label("badpointer"));
1084 &test ("edi",-1);
1085 &jz (&label("badpointer"));
1086
1087 &call (&label("pic_point"));
1088 &set_label("pic_point");
1089 &blindpop("ebp");
1090 &lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
1091
1092 &mov ("ecx",&wparam(1)); # number of bits in key
1093 &cmp ("ecx",128);
1094 &je (&label("10rounds"));
1095 &cmp ("ecx",192);
1096 &je (&label("12rounds"));
1097 &cmp ("ecx",256);
1098 &je (&label("14rounds"));
1099 &mov ("eax",-2); # invalid number of bits
1100 &jmp (&label("exit"));
1101
1102 &set_label("10rounds");
1103 &mov ("eax",&DWP(0,"esi")); # copy first 4 dwords
1104 &mov ("ebx",&DWP(4,"esi"));
1105 &mov ("ecx",&DWP(8,"esi"));
1106 &mov ("edx",&DWP(12,"esi"));
1107 &mov (&DWP(0,"edi"),"eax");
1108 &mov (&DWP(4,"edi"),"ebx");
1109 &mov (&DWP(8,"edi"),"ecx");
1110 &mov (&DWP(12,"edi"),"edx");
1111
1112 &xor ("ecx","ecx");
1113 &jmp (&label("10shortcut"));
1114
1115 &align (4);
1116 &set_label("10loop");
1117 &mov ("eax",&DWP(0,"edi")); # rk[0]
1118 &mov ("edx",&DWP(12,"edi")); # rk[3]
1119 &set_label("10shortcut");
1120 &enckey ();
1121
1122 &mov (&DWP(16,"edi"),"eax"); # rk[4]
1123 &xor ("eax",&DWP(4,"edi"));
1124 &mov (&DWP(20,"edi"),"eax"); # rk[5]
1125 &xor ("eax",&DWP(8,"edi"));
1126 &mov (&DWP(24,"edi"),"eax"); # rk[6]
1127 &xor ("eax",&DWP(12,"edi"));
1128 &mov (&DWP(28,"edi"),"eax"); # rk[7]
1129 &inc ("ecx");
1130 &add ("edi",16);
1131 &cmp ("ecx",10);
1132 &jl (&label("10loop"));
1133
1134 &mov (&DWP(80,"edi"),10); # setup number of rounds
1135 &xor ("eax","eax");
1136 &jmp (&label("exit"));
1137
1138 &set_label("12rounds");
1139 &mov ("eax",&DWP(0,"esi")); # copy first 6 dwords
1140 &mov ("ebx",&DWP(4,"esi"));
1141 &mov ("ecx",&DWP(8,"esi"));
1142 &mov ("edx",&DWP(12,"esi"));
1143 &mov (&DWP(0,"edi"),"eax");
1144 &mov (&DWP(4,"edi"),"ebx");
1145 &mov (&DWP(8,"edi"),"ecx");
1146 &mov (&DWP(12,"edi"),"edx");
1147 &mov ("ecx",&DWP(16,"esi"));
1148 &mov ("edx",&DWP(20,"esi"));
1149 &mov (&DWP(16,"edi"),"ecx");
1150 &mov (&DWP(20,"edi"),"edx");
1151
1152 &xor ("ecx","ecx");
1153 &jmp (&label("12shortcut"));
1154
1155 &align (4);
1156 &set_label("12loop");
1157 &mov ("eax",&DWP(0,"edi")); # rk[0]
1158 &mov ("edx",&DWP(20,"edi")); # rk[5]
1159 &set_label("12shortcut");
1160 &enckey ();
1161
1162 &mov (&DWP(24,"edi"),"eax"); # rk[6]
1163 &xor ("eax",&DWP(4,"edi"));
1164 &mov (&DWP(28,"edi"),"eax"); # rk[7]
1165 &xor ("eax",&DWP(8,"edi"));
1166 &mov (&DWP(32,"edi"),"eax"); # rk[8]
1167 &xor ("eax",&DWP(12,"edi"));
1168 &mov (&DWP(36,"edi"),"eax"); # rk[9]
1169
1170 &cmp ("ecx",7);
1171 &je (&label("12break"));
1172 &inc ("ecx");
1173
1174 &xor ("eax",&DWP(16,"edi"));
1175 &mov (&DWP(40,"edi"),"eax"); # rk[10]
1176 &xor ("eax",&DWP(20,"edi"));
1177 &mov (&DWP(44,"edi"),"eax"); # rk[11]
1178
1179 &add ("edi",24);
1180 &jmp (&label("12loop"));
1181
1182 &set_label("12break");
1183 &mov (&DWP(72,"edi"),12); # setup number of rounds
1184 &xor ("eax","eax");
1185 &jmp (&label("exit"));
1186
1187 &set_label("14rounds");
1188 &mov ("eax",&DWP(0,"esi")); # copy first 8 dwords
1189 &mov ("ebx",&DWP(4,"esi"));
1190 &mov ("ecx",&DWP(8,"esi"));
1191 &mov ("edx",&DWP(12,"esi"));
1192 &mov (&DWP(0,"edi"),"eax");
1193 &mov (&DWP(4,"edi"),"ebx");
1194 &mov (&DWP(8,"edi"),"ecx");
1195 &mov (&DWP(12,"edi"),"edx");
1196 &mov ("eax",&DWP(16,"esi"));
1197 &mov ("ebx",&DWP(20,"esi"));
1198 &mov ("ecx",&DWP(24,"esi"));
1199 &mov ("edx",&DWP(28,"esi"));
1200 &mov (&DWP(16,"edi"),"eax");
1201 &mov (&DWP(20,"edi"),"ebx");
1202 &mov (&DWP(24,"edi"),"ecx");
1203 &mov (&DWP(28,"edi"),"edx");
1204
1205 &xor ("ecx","ecx");
1206 &jmp (&label("14shortcut"));
1207
1208 &align (4);
1209 &set_label("14loop");
1210 &mov ("edx",&DWP(28,"edi")); # rk[7]
1211 &set_label("14shortcut");
1212 &mov ("eax",&DWP(0,"edi")); # rk[0]
1213
1214 &enckey ();
1215
1216 &mov (&DWP(32,"edi"),"eax"); # rk[8]
1217 &xor ("eax",&DWP(4,"edi"));
1218 &mov (&DWP(36,"edi"),"eax"); # rk[9]
1219 &xor ("eax",&DWP(8,"edi"));
1220 &mov (&DWP(40,"edi"),"eax"); # rk[10]
1221 &xor ("eax",&DWP(12,"edi"));
1222 &mov (&DWP(44,"edi"),"eax"); # rk[11]
1223
1224 &cmp ("ecx",6);
1225 &je (&label("14break"));
1226 &inc ("ecx");
1227
1228 &mov ("edx","eax");
1229 &mov ("eax",&DWP(16,"edi")); # rk[4]
1230 &movz ("esi",&LB("edx")); # rk[11]>>0
1231 &mov ("ebx",&DWP(2,"ebp","esi",8));
1232 &movz ("esi",&HB("edx")); # rk[11]>>8
1233 &and ("ebx",0x000000FF);
1234 &xor ("eax","ebx");
1235
1236 &mov ("ebx",&DWP(0,"ebp","esi",8));
1237 &shr ("edx",16);
1238 &and ("ebx",0x0000FF00);
1239 &movz ("esi",&LB("edx")); # rk[11]>>16
1240 &xor ("eax","ebx");
1241
1242 &mov ("ebx",&DWP(0,"ebp","esi",8));
1243 &movz ("esi",&HB("edx")); # rk[11]>>24
1244 &and ("ebx",0x00FF0000);
1245 &xor ("eax","ebx");
1246
1247 &mov ("ebx",&DWP(2,"ebp","esi",8));
1248 &and ("ebx",0xFF000000);
1249 &xor ("eax","ebx");
1250
1251 &mov (&DWP(48,"edi"),"eax"); # rk[12]
1252 &xor ("eax",&DWP(20,"edi"));
1253 &mov (&DWP(52,"edi"),"eax"); # rk[13]
1254 &xor ("eax",&DWP(24,"edi"));
1255 &mov (&DWP(56,"edi"),"eax"); # rk[14]
1256 &xor ("eax",&DWP(28,"edi"));
1257 &mov (&DWP(60,"edi"),"eax"); # rk[15]
1258
1259 &add ("edi",32);
1260 &jmp (&label("14loop"));
1261
1262 &set_label("14break");
1263 &mov (&DWP(48,"edi"),14); # setup number of rounds
1264 &xor ("eax","eax");
1265 &jmp (&label("exit"));
1266
1267 &set_label("badpointer");
1268 &mov ("eax",-1);
1269 &set_label("exit");
1270 &function_end("AES_set_encrypt_key");
1271
1272 sub deckey()
1273 { my ($i,$ptr,$te,$td) = @_;
1274
1275 &mov ("eax",&DWP($i,$ptr));
1276 &mov ("edx","eax");
1277 &movz ("ebx",&HB("eax"));
1278 &shr ("edx",16);
1279 &and ("eax",0xFF);
1280 &movz ("eax",&BP(2,$te,"eax",8));
1281 &movz ("ebx",&BP(2,$te,"ebx",8));
1282 &mov ("eax",&DWP(0,$td,"eax",8));
1283 &xor ("eax",&DWP(3,$td,"ebx",8));
1284 &movz ("ebx",&HB("edx"));
1285 &and ("edx",0xFF);
1286 &movz ("edx",&BP(2,$te,"edx",8));
1287 &movz ("ebx",&BP(2,$te,"ebx",8));
1288 &xor ("eax",&DWP(2,$td,"edx",8));
1289 &xor ("eax",&DWP(1,$td,"ebx",8));
1290 &mov (&DWP($i,$ptr),"eax");
1291 }
1292
1293 # int AES_set_decrypt_key(const unsigned char *userKey, const int bits,
1294 # AES_KEY *key)
1295 &public_label("AES_Td");
1296 &public_label("AES_Te");
1297 &function_begin_B("AES_set_decrypt_key");
1298 &mov ("eax",&wparam(0));
1299 &mov ("ecx",&wparam(1));
1300 &mov ("edx",&wparam(2));
1301 &sub ("esp",12);
1302 &mov (&DWP(0,"esp"),"eax");
1303 &mov (&DWP(4,"esp"),"ecx");
1304 &mov (&DWP(8,"esp"),"edx");
1305 &call ("AES_set_encrypt_key");
1306 &add ("esp",12);
1307 &cmp ("eax",0);
1308 &je (&label("proceed"));
1309 &ret ();
1310
1311 &set_label("proceed");
1312 &push ("ebp");
1313 &push ("ebx");
1314 &push ("esi");
1315 &push ("edi");
1316
1317 &mov ("esi",&wparam(2));
1318 &mov ("ecx",&DWP(240,"esi")); # pull number of rounds
1319 &lea ("ecx",&DWP(0,"","ecx",4));
1320 &lea ("edi",&DWP(0,"esi","ecx",4)); # pointer to last chunk
1321
1322 &align (4);
1323 &set_label("invert"); # invert order of chunks
1324 &mov ("eax",&DWP(0,"esi"));
1325 &mov ("ebx",&DWP(4,"esi"));
1326 &mov ("ecx",&DWP(0,"edi"));
1327 &mov ("edx",&DWP(4,"edi"));
1328 &mov (&DWP(0,"edi"),"eax");
1329 &mov (&DWP(4,"edi"),"ebx");
1330 &mov (&DWP(0,"esi"),"ecx");
1331 &mov (&DWP(4,"esi"),"edx");
1332 &mov ("eax",&DWP(8,"esi"));
1333 &mov ("ebx",&DWP(12,"esi"));
1334 &mov ("ecx",&DWP(8,"edi"));
1335 &mov ("edx",&DWP(12,"edi"));
1336 &mov (&DWP(8,"edi"),"eax");
1337 &mov (&DWP(12,"edi"),"ebx");
1338 &mov (&DWP(8,"esi"),"ecx");
1339 &mov (&DWP(12,"esi"),"edx");
1340 &add ("esi",16);
1341 &sub ("edi",16);
1342 &cmp ("esi","edi");
1343 &jne (&label("invert"));
1344
1345 &call (&label("pic_point"));
1346 &set_label("pic_point");
1347 blindpop("ebp");
1348 &lea ("edi",&DWP(&label("AES_Td")."-".&label("pic_point"),"ebp"));
1349 &lea ("ebp",&DWP(&label("AES_Te")."-".&label("pic_point"),"ebp"));
1350
1351 &mov ("esi",&wparam(2));
1352 &mov ("ecx",&DWP(240,"esi")); # pull number of rounds
1353 &dec ("ecx");
1354 &align (4);
1355 &set_label("permute"); # permute the key schedule
1356 &add ("esi",16);
1357 &deckey (0,"esi","ebp","edi");
1358 &deckey (4,"esi","ebp","edi");
1359 &deckey (8,"esi","ebp","edi");
1360 &deckey (12,"esi","ebp","edi");
1361 &dec ("ecx");
1362 &jnz (&label("permute"));
1363
1364 &xor ("eax","eax"); # return success
1365 &function_end("AES_set_decrypt_key");
1366
1367 &asm_finish();
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