aes.asm 10.5 KB
Newer Older
1
! -*- mode: asm; asm-comment-char: ?!; -*-  
Niels Möller's avatar
Niels Möller committed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
! nettle, low-level cryptographics library
! 
! Copyright (C) 2002 Niels Mller
!  
! The nettle library is free software; you can redistribute it and/or modify
! it under the terms of the GNU Lesser General Public License as published by
! the Free Software Foundation; either version 2.1 of the License, or (at your
! option) any later version.
! 
! The nettle library is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
! License for more details.
! 
! You should have received a copy of the GNU Lesser General Public License
! along with the nettle library; see the file COPYING.LIB.  If not, write to
! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
! MA 02111-1307, USA.

21
22
! NOTE: Some of the %g registers are reserved for operating system etc
! (see gcc/config/sparc.h). We should use only %g1-%g3 to be safe.
Niels Möller's avatar
Niels Möller committed
23
	
24
	! Used registers:	%l0,1,2,3,4,5,6,7
25
26
	!			%i0,1,2,3,4,5 (%i6=%fp, %i7 = return)
	!			%o0,1,2,3,4,5,7 (%o6=%sp)
27
	!			%g1,2,3,5
Niels Möller's avatar
Niels Möller committed
28
	
29
	.file	"aes.asm"
Niels Möller's avatar
Niels Möller committed
30
	
31
	.section	".text"
32
	.align 16
33
34
	.global _aes_crypt
	.type	_aes_crypt,#function
35
	.proc	020
36

37
! Arguments
38
define(ctx, %i0)
39
define(T, %i1)
40
define(length, %i2)
41
define(dst, %i3)
42
define(src, %i4)
43

44
! Loop invariants
45
define(wtxt, %l0)
46
define(tmp, %l1)
47
define(diff, %l2)
48
define(nrounds, %l3)
49
50

! Loop variables
51
define(round, %l4)
52
define(i, %l5)
53
define(key, %o4)
54

55
56
57
! Further loop invariants
define(T0, %l6)
define(T1, %l7)
58
define(T2, %g5)
59
define(T3, %o7)
60
61
define(IDX1, %i5)
define(IDX3, %o5)
62

63
! Teporaries
64
define(t0, %o0)
65
define(t1, %o1)
66
define(t2, %o2)
67
68
define(t3, %o3)

69
70
71
72
73
74
75
76
C The stack frame looks like
C
C %fp -   4: OS-dependent link field
C %fp -   8: OS-dependent link field
C %fp -  24: tmp, uint32_t[4]
C %fp -  40: wtxt, uint32_t[4]
C %fp - 136: OS register save area. 
define(<FRAME_SIZE>, 136)
77

78
_aes_crypt:
79
	save	%sp, -FRAME_SIZE, %sp
80
	cmp	length, 0
81
	be	.Lend
82
83
84
85
	! wtxt
	add	%fp, -24, wtxt
	
	add	%fp, -40, tmp
86

87
	ld	[ctx + AES_NROUNDS], nrounds
88
89
	! Compute xor, so that we can swap efficiently.
	xor	wtxt, tmp, diff
90
	! The loop variable will be multiplied by 16.
91
92
	! More loop invariants
	add	T, AES_TABLE0, T0
Niels Möller's avatar
Niels Möller committed
93
	
94
	add	T, AES_TABLE1, T1
95
96
	add	T, AES_TABLE2, T2
	add	T, AES_TABLE3, T3
97
	add	T, AES_SIDX1, IDX1
Niels Möller's avatar
Niels Möller committed
98
	
99
	add	T, AES_SIDX3, IDX3
100
	! Read src, and add initial subkey
101
	! Difference between ctx and src.
Niels Möller's avatar
Niels Möller committed
102
	! NOTE: These instructions are duplicated in the delay slot,
103
	! and the instruction before the branch.
104
105
106
	sub	ctx, src, %g2
	! Difference between wtxt and src
	sub	wtxt, src, %g3
107
.Lblock_loop:
108
109
	! For stop condition. Note that src is incremented in the
	! delay slot
110
	add	src, 8, %g1
111
	
112
.Lsource_loop:
113
114
115
116
	ldub	[src+3], t3
	ldub	[src+2], t2
	sll	t3, 24, t3
	ldub	[src+1], t1
117
	
118
119
120
121
	sll	t2, 16, t2
	or	t3, t2, t3
	ldub	[src], t0
	sll	t1, 8, t1
122
	
123
	! Get subkey
124
	ld	[src+%g2], t2
125
126
	or	t3, t1, t3
	or	t3, t0, t3
127
	xor	t3, t2, t3
128
	
129
	cmp	src, %g1
130
	st	t3, [src+%g3]
131
	bleu	.Lsource_loop
132
	add	src, 4, src
133
	
134
	sub	nrounds, 1, round
135
	add	ctx, 16, key
Niels Möller's avatar
Niels Möller committed
136
	nop
137
	! 4*i
138
	! NOTE: Instruction duplicated in delay slot
139
	mov	0, i
140
.Linner_loop:
141
	! The comments mark which j in T->table[j][ Bj(wtxt[IDXi(i)]) ]
142
143
144
145
	! the instruction is a part of. 
	!
	! The code uses the register %o[j], aka tj, as the primary 
	! register for that sub-expression. True for j==1,3.
146
147

	C i = 0
148
	ld	[IDX1], t1		! 1
149
150
	
	! IDX2(j) = j XOR 2
151
152
	mov	8, t2			! 2
	C xor	i, 8, t2		! 2
153
154
	add	wtxt, t1, t1		! 1
	ldub	[t1+2], t1		! 1
155
	ld	[IDX3], t3		! 3
156
157
	
	sll	t1, 2, t1		! 1
158
	ld	[wtxt], t0		! 0
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
	lduh	[wtxt+t2], t2		! 2
	and	t0, 255, t0		! 0
	
	ldub	[wtxt+t3], t3		! 3
	sll	t0, 2, t0		! 0
	ld	[T0+t0], t0		! 0
	and	t2, 255, t2		! 2
	
	ld	[T1+t1], t1		! 1
	sll	t2, 2, t2		! 2
	ld	[T2+t2], t2		! 2
	sll	t3, 2, t3		! 3
	
	ld	[T3+t3], t3		! 3
	xor	t0, t1, t0		! 0, 1
	xor	t0, t2, t0		! 0, 1, 2
	! Fetch roundkey
176
	ld	[key], t1
177
178
179
	
	xor	t0, t3, t0		! 0, 1, 2, 3
	xor	t0, t1, t0
180
	st	t0, [tmp]
181
182
183
	add	i, 4, i

	C i = 1
184
	ld	[IDX1+i], t1		! 1
185
	
186
187
	! IDX2(j) = j XOR 2
	xor	i, 8, t2
188
189
	add	wtxt, t1, t1		! 1
	ldub	[t1+2], t1		! 1
Niels Möller's avatar
Niels Möller committed
190
	ld	[IDX3+i], t3		! 3
191
	
192
	sll	t1, 2, t1		! 1
193
	ld	[wtxt+i], t0		! 0
194
	lduh	[wtxt+t2], t2		! 2
Niels Möller's avatar
Niels Möller committed
195
	and	t0, 255, t0		! 0
196
	
197
	ldub	[wtxt+t3], t3		! 3
198
	sll	t0, 2, t0		! 0
199
	ld	[T0+t0], t0		! 0
Niels Möller's avatar
Niels Möller committed
200
	and	t2, 255, t2		! 2
201
	
202
	ld	[T1+t1], t1		! 1
203
	sll	t2, 2, t2		! 2
204
	ld	[T2+t2], t2		! 2
Niels Möller's avatar
Niels Möller committed
205
	sll	t3, 2, t3		! 3
206
	
207
	ld	[T3+t3], t3		! 3
208
209
	xor	t0, t1, t0		! 0, 1
	xor	t0, t2, t0		! 0, 1, 2
210
	! Fetch roundkey
211
	ld	[key+i], t1
212
	
213
	xor	t0, t3, t0		! 0, 1, 2, 3
214
	xor	t0, t1, t0
215
	st	t0, [tmp+i]
216
	add	i, 4, i
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289

	C = 2
	ld	[IDX1+i], t1		! 1
	
	! IDX2(j) = j XOR 2
	xor	i, 8, t2
	add	wtxt, t1, t1		! 1
	ldub	[t1+2], t1		! 1
	ld	[IDX3+i], t3		! 3
	
	sll	t1, 2, t1		! 1
	ld	[wtxt+i], t0		! 0
	lduh	[wtxt+t2], t2		! 2
	and	t0, 255, t0		! 0
	
	ldub	[wtxt+t3], t3		! 3
	sll	t0, 2, t0		! 0
	ld	[T0+t0], t0		! 0
	and	t2, 255, t2		! 2
	
	ld	[T1+t1], t1		! 1
	sll	t2, 2, t2		! 2
	ld	[T2+t2], t2		! 2
	sll	t3, 2, t3		! 3
	
	ld	[T3+t3], t3		! 3
	xor	t0, t1, t0		! 0, 1
	xor	t0, t2, t0		! 0, 1, 2
	! Fetch roundkey
	ld	[key+i], t1
	
	xor	t0, t3, t0		! 0, 1, 2, 3
	xor	t0, t1, t0
	st	t0, [tmp+i]
	add	i, 4, i

	C = 3
	ld	[IDX1+i], t1		! 1
	
	! IDX2(j) = j XOR 2
	xor	i, 8, t2
	add	wtxt, t1, t1		! 1
	ldub	[t1+2], t1		! 1
	ld	[IDX3+i], t3		! 3
	
	sll	t1, 2, t1		! 1
	ld	[wtxt+i], t0		! 0
	lduh	[wtxt+t2], t2		! 2
	and	t0, 255, t0		! 0
	
	ldub	[wtxt+t3], t3		! 3
	sll	t0, 2, t0		! 0
	ld	[T0+t0], t0		! 0
	and	t2, 255, t2		! 2
	
	ld	[T1+t1], t1		! 1
	sll	t2, 2, t2		! 2
	ld	[T2+t2], t2		! 2
	sll	t3, 2, t3		! 3
	
	ld	[T3+t3], t3		! 3
	xor	t0, t1, t0		! 0, 1
	xor	t0, t2, t0		! 0, 1, 2
	! Fetch roundkey
	ld	[key+i], t1
	
	xor	t0, t3, t0		! 0, 1, 2, 3
	xor	t0, t1, t0
	st	t0, [tmp+i]
	add	i, 4, i
			
	C End loop
	
290
	! switch roles for tmp and wtxt
291
	xor	wtxt, diff, wtxt
292
	xor	tmp, diff, tmp
293

294
	subcc	round, 1, round
295
	add	key, 16, key
296
297
	bne	.Linner_loop
	mov	0, i
298

299
	! final round
300
301
302
	! Use round as the loop variable, as it's already zero
undefine(<i>)
define(i, round)
303

304
305
	! Comments mark which j in T->sbox[Bj(wtxt[IDXj(i)])]
	! the instruction is part of
306
	! NOTE: First instruction duplicated in delay slot
307
	ld	[IDX1+i], t1 	! 1
308
.Lfinal_loop:
309
	! IDX2(j) = j XOR 2
310
	xor	i, 8, t2
311
312
	add	wtxt, t1, t1	! 1
	ldub	[t1+2], t1	! 1
313

314
	ld	[wtxt+i], t0	! 0
315
	lduh	[wtxt+t2], t2	! 2
316
	and	t0, 255, t0	! 0
317
	ld	[IDX3 + i], t3	! 3
318
	
319
	and	t2, 255, t2	! 2
320
	ldub	[T+t1], t1	! 1
321
	ldub	[T+t0], t0	! 0
322
	sll	t1, 8, t1	! 1
323
	
324
	ldub	[wtxt+t3], t3	! 3
325
	or	t0, t1, t0	! 0, 1
326
	ldub	[T+t2], t2	! 2
327
	ldub	[T+t3], t3	! 3
328
	
329
330
	sll	t2, 16, t2	! 2
	or	t0, t2, t0	! 0, 1, 2
331
	ld	[key + i], t2
332
	sll	t3, 24, t3	! 3
333
	
334
	or	t0, t3, t0	! 0, 1, 2, 3
335
336
337
338
339
340
341
	xor	t0, t2, t0
	add	i, 4, i
	cmp	i, 12
	
	srl	t0, 24, t3
	srl	t0, 16, t2
	srl	t0, 8, t1
342
	stb	t1, [dst+1]
343
	
344
345
346
	stb	t3, [dst+3]
	stb	t2, [dst+2]
	stb	t0, [dst]
347
	add	dst, 4, dst
348
	
349
	bleu	.Lfinal_loop
350
	ld	[IDX1+i], t1 	! 1
351
	addcc	length, -16, length
352
	sub	ctx, src, %g2
353
	
354
	bne	.Lblock_loop
355
	sub	wtxt, src, %g3
356

357
.Lend:
358
	C add	%sp, FRAME_SIZE, %fp
359
360
	ret
	restore
361
362
363
364
.LLFE1:
.LLfe1:
	.size	_aes_crypt,.LLfe1-_aes_crypt

365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
	! Benchmarks on my slow sparcstation:	
	! Original C code	
	! aes128 (ECB encrypt): 14.36s, 0.696MB/s
	! aes128 (ECB decrypt): 17.19s, 0.582MB/s
	! aes128 (CBC encrypt): 16.08s, 0.622MB/s
	! aes128 ((CBC decrypt)): 18.79s, 0.532MB/s
	! 
	! aes192 (ECB encrypt): 16.85s, 0.593MB/s
	! aes192 (ECB decrypt): 19.64s, 0.509MB/s
	! aes192 (CBC encrypt): 18.43s, 0.543MB/s
	! aes192 (CBC decrypt): 20.76s, 0.482MB/s
	! 
	! aes256 (ECB encrypt): 19.12s, 0.523MB/s
	! aes256 (ECB decrypt): 22.57s, 0.443MB/s
	! aes256 (CBC encrypt): 20.92s, 0.478MB/s
	! aes256 (CBC decrypt): 23.22s, 0.431MB/s

	! After unrolling key_addition32, and getting rid of
	! some sll x, 2, x, encryption speed is 0.760 MB/s.

	! Next, the C code was optimized to use larger tables and
	! no rotates. New timings:
	! aes128 (ECB encrypt): 13.10s, 0.763MB/s
	! aes128 (ECB decrypt): 11.51s, 0.869MB/s
	! aes128 (CBC encrypt): 15.15s, 0.660MB/s
	! aes128 (CBC decrypt): 13.10s, 0.763MB/s
	! 
	! aes192 (ECB encrypt): 15.68s, 0.638MB/s
	! aes192 (ECB decrypt): 13.59s, 0.736MB/s
	! aes192 (CBC encrypt): 17.65s, 0.567MB/s
	! aes192 (CBC decrypt): 15.31s, 0.653MB/s
	! 
	! aes256 (ECB encrypt): 17.95s, 0.557MB/s
	! aes256 (ECB decrypt): 15.90s, 0.629MB/s
	! aes256 (CBC encrypt): 20.16s, 0.496MB/s
	! aes256 (CBC decrypt): 17.47s, 0.572MB/s

	! After optimization using pre-shifted indices
	! (AES_SIDX[1-3]): 
	! aes128 (ECB encrypt): 12.46s, 0.803MB/s
	! aes128 (ECB decrypt): 10.74s, 0.931MB/s
	! aes128 (CBC encrypt): 17.74s, 0.564MB/s
	! aes128 (CBC decrypt): 12.43s, 0.805MB/s
	! 
	! aes192 (ECB encrypt): 14.59s, 0.685MB/s
	! aes192 (ECB decrypt): 12.76s, 0.784MB/s
	! aes192 (CBC encrypt): 19.97s, 0.501MB/s
	! aes192 (CBC decrypt): 14.46s, 0.692MB/s
	! 
	! aes256 (ECB encrypt): 17.00s, 0.588MB/s
	! aes256 (ECB decrypt): 14.81s, 0.675MB/s
	! aes256 (CBC encrypt): 22.65s, 0.442MB/s
	! aes256 (CBC decrypt): 16.46s, 0.608MB/s
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450

	! After implementing double buffering
	! aes128 (ECB encrypt): 12.59s, 0.794MB/s
	! aes128 (ECB decrypt): 10.56s, 0.947MB/s
	! aes128 (CBC encrypt): 17.91s, 0.558MB/s
	! aes128 (CBC decrypt): 12.30s, 0.813MB/s
	! 
	! aes192 (ECB encrypt): 15.03s, 0.665MB/s
	! aes192 (ECB decrypt): 12.56s, 0.796MB/s
	! aes192 (CBC encrypt): 20.30s, 0.493MB/s
	! aes192 (CBC decrypt): 14.26s, 0.701MB/s
	! 
	! aes256 (ECB encrypt): 17.30s, 0.578MB/s
	! aes256 (ECB decrypt): 14.51s, 0.689MB/s
	! aes256 (CBC encrypt): 22.75s, 0.440MB/s
	! aes256 (CBC decrypt): 16.35s, 0.612MB/s
	
	! After reordering aes-encrypt.c and aes-decypt.c
	! (the order probably causes strange cache-effects):
	! aes128 (ECB encrypt): 9.21s, 1.086MB/s
	! aes128 (ECB decrypt): 11.13s, 0.898MB/s
	! aes128 (CBC encrypt): 14.12s, 0.708MB/s
	! aes128 (CBC decrypt): 13.77s, 0.726MB/s
	! 
	! aes192 (ECB encrypt): 10.86s, 0.921MB/s
	! aes192 (ECB decrypt): 13.17s, 0.759MB/s
	! aes192 (CBC encrypt): 15.74s, 0.635MB/s
	! aes192 (CBC decrypt): 15.91s, 0.629MB/s
	! 
	! aes256 (ECB encrypt): 12.71s, 0.787MB/s
	! aes256 (ECB decrypt): 15.38s, 0.650MB/s
	! aes256 (CBC encrypt): 17.49s, 0.572MB/s
	! aes256 (CBC decrypt): 17.87s, 0.560MB/s
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468

	! After further optimizations of the initial and final loops,
	! source_loop and final_loop. 
	! aes128 (ECB encrypt): 8.07s, 1.239MB/s
	! aes128 (ECB decrypt): 9.48s, 1.055MB/s
	! aes128 (CBC encrypt): 12.76s, 0.784MB/s
	! aes128 (CBC decrypt): 12.15s, 0.823MB/s
	! 
	! aes192 (ECB encrypt): 9.43s, 1.060MB/s
	! aes192 (ECB decrypt): 11.20s, 0.893MB/s
	! aes192 (CBC encrypt): 14.19s, 0.705MB/s
	! aes192 (CBC decrypt): 13.97s, 0.716MB/s
	! 
	! aes256 (ECB encrypt): 10.81s, 0.925MB/s
	! aes256 (ECB decrypt): 12.92s, 0.774MB/s
	! aes256 (CBC encrypt): 15.59s, 0.641MB/s
	! aes256 (CBC decrypt): 15.76s, 0.635MB/s