summaryrefslogtreecommitdiffstats
path: root/arch/x86/crypto/chacha20-ssse3-x86_64.S
blob: d8ac75bb448f931b6065615a37d6977a3e9df8bd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
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
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
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
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
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
/*
 * ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 functions
 *
 * Copyright (C) 2015 Martin Willi
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/linkage.h>

.section	.rodata.cst16.ROT8, "aM", @progbits, 16
.align 16
ROT8:	.octa 0x0e0d0c0f0a09080b0605040702010003
.section	.rodata.cst16.ROT16, "aM", @progbits, 16
.align 16
ROT16:	.octa 0x0d0c0f0e09080b0a0504070601000302
.section	.rodata.cst16.CTRINC, "aM", @progbits, 16
.align 16
CTRINC:	.octa 0x00000003000000020000000100000000

.text

ENTRY(chacha20_block_xor_ssse3)
	# %rdi: Input state matrix, s
	# %rsi: up to 1 data block output, o
	# %rdx: up to 1 data block input, i
	# %rcx: input/output length in bytes

	# This function encrypts one ChaCha20 block by loading the state matrix
	# in four SSE registers. It performs matrix operation on four words in
	# parallel, but requires shuffling to rearrange the words after each
	# round. 8/16-bit word rotation is done with the slightly better
	# performing SSSE3 byte shuffling, 7/12-bit word rotation uses
	# traditional shift+OR.

	# x0..3 = s0..3
	movdqa		0x00(%rdi),%xmm0
	movdqa		0x10(%rdi),%xmm1
	movdqa		0x20(%rdi),%xmm2
	movdqa		0x30(%rdi),%xmm3
	movdqa		%xmm0,%xmm8
	movdqa		%xmm1,%xmm9
	movdqa		%xmm2,%xmm10
	movdqa		%xmm3,%xmm11

	movdqa		ROT8(%rip),%xmm4
	movdqa		ROT16(%rip),%xmm5

	mov		%rcx,%rax
	mov		$10,%ecx

.Ldoubleround:

	# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
	paddd		%xmm1,%xmm0
	pxor		%xmm0,%xmm3
	pshufb		%xmm5,%xmm3

	# x2 += x3, x1 = rotl32(x1 ^ x2, 12)
	paddd		%xmm3,%xmm2
	pxor		%xmm2,%xmm1
	movdqa		%xmm1,%xmm6
	pslld		$12,%xmm6
	psrld		$20,%xmm1
	por		%xmm6,%xmm1

	# x0 += x1, x3 = rotl32(x3 ^ x0, 8)
	paddd		%xmm1,%xmm0
	pxor		%xmm0,%xmm3
	pshufb		%xmm4,%xmm3

	# x2 += x3, x1 = rotl32(x1 ^ x2, 7)
	paddd		%xmm3,%xmm2
	pxor		%xmm2,%xmm1
	movdqa		%xmm1,%xmm7
	pslld		$7,%xmm7
	psrld		$25,%xmm1
	por		%xmm7,%xmm1

	# x1 = shuffle32(x1, MASK(0, 3, 2, 1))
	pshufd		$0x39,%xmm1,%xmm1
	# x2 = shuffle32(x2, MASK(1, 0, 3, 2))
	pshufd		$0x4e,%xmm2,%xmm2
	# x3 = shuffle32(x3, MASK(2, 1, 0, 3))
	pshufd		$0x93,%xmm3,%xmm3

	# x0 += x1, x3 = rotl32(x3 ^ x0, 16)
	paddd		%xmm1,%xmm0
	pxor		%xmm0,%xmm3
	pshufb		%xmm5,%xmm3

	# x2 += x3, x1 = rotl32(x1 ^ x2, 12)
	paddd		%xmm3,%xmm2
	pxor		%xmm2,%xmm1
	movdqa		%xmm1,%xmm6
	pslld		$12,%xmm6
	psrld		$20,%xmm1
	por		%xmm6,%xmm1

	# x0 += x1, x3 = rotl32(x3 ^ x0, 8)
	paddd		%xmm1,%xmm0
	pxor		%xmm0,%xmm3
	pshufb		%xmm4,%xmm3

	# x2 += x3, x1 = rotl32(x1 ^ x2, 7)
	paddd		%xmm3,%xmm2
	pxor		%xmm2,%xmm1
	movdqa		%xmm1,%xmm7
	pslld		$7,%xmm7
	psrld		$25,%xmm1
	por		%xmm7,%xmm1

	# x1 = shuffle32(x1, MASK(2, 1, 0, 3))
	pshufd		$0x93,%xmm1,%xmm1
	# x2 = shuffle32(x2, MASK(1, 0, 3, 2))
	pshufd		$0x4e,%xmm2,%xmm2
	# x3 = shuffle32(x3, MASK(0, 3, 2, 1))
	pshufd		$0x39,%xmm3,%xmm3

	dec		%ecx
	jnz		.Ldoubleround

	# o0 = i0 ^ (x0 + s0)
	paddd		%xmm8,%xmm0
	cmp		$0x10,%rax
	jl		.Lxorpart
	movdqu		0x00(%rdx),%xmm4
	pxor		%xmm4,%xmm0
	movdqu		%xmm0,0x00(%rsi)
	# o1 = i1 ^ (x1 + s1)
	paddd		%xmm9,%xmm1
	movdqa		%xmm1,%xmm0
	cmp		$0x20,%rax
	jl		.Lxorpart
	movdqu		0x10(%rdx),%xmm0
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x10(%rsi)
	# o2 = i2 ^ (x2 + s2)
	paddd		%xmm10,%xmm2
	movdqa		%xmm2,%xmm0
	cmp		$0x30,%rax
	jl		.Lxorpart
	movdqu		0x20(%rdx),%xmm0
	pxor		%xmm2,%xmm0
	movdqu		%xmm0,0x20(%rsi)
	# o3 = i3 ^ (x3 + s3)
	paddd		%xmm11,%xmm3
	movdqa		%xmm3,%xmm0
	cmp		$0x40,%rax
	jl		.Lxorpart
	movdqu		0x30(%rdx),%xmm0
	pxor		%xmm3,%xmm0
	movdqu		%xmm0,0x30(%rsi)

.Ldone:
	ret

.Lxorpart:
	# xor remaining bytes from partial register into output
	mov		%rax,%r9
	and		$0x0f,%r9
	jz		.Ldone
	and		$~0x0f,%rax

	mov		%rsi,%r11

	lea		8(%rsp),%r10
	sub		$0x10,%rsp
	and		$~31,%rsp

	lea		(%rdx,%rax),%rsi
	mov		%rsp,%rdi
	mov		%r9,%rcx
	rep movsb

	pxor		0x00(%rsp),%xmm0
	movdqa		%xmm0,0x00(%rsp)

	mov		%rsp,%rsi
	lea		(%r11,%rax),%rdi
	mov		%r9,%rcx
	rep movsb

	lea		-8(%r10),%rsp
	jmp		.Ldone

ENDPROC(chacha20_block_xor_ssse3)

ENTRY(chacha20_4block_xor_ssse3)
	# %rdi: Input state matrix, s
	# %rsi: up to 4 data blocks output, o
	# %rdx: up to 4 data blocks input, i
	# %rcx: input/output length in bytes

	# This function encrypts four consecutive ChaCha20 blocks by loading the
	# the state matrix in SSE registers four times. As we need some scratch
	# registers, we save the first four registers on the stack. The
	# algorithm performs each operation on the corresponding word of each
	# state matrix, hence requires no word shuffling. For final XORing step
	# we transpose the matrix by interleaving 32- and then 64-bit words,
	# which allows us to do XOR in SSE registers. 8/16-bit word rotation is
	# done with the slightly better performing SSSE3 byte shuffling,
	# 7/12-bit word rotation uses traditional shift+OR.

	lea		8(%rsp),%r10
	sub		$0x80,%rsp
	and		$~63,%rsp
	mov		%rcx,%rax

	# x0..15[0-3] = s0..3[0..3]
	movq		0x00(%rdi),%xmm1
	pshufd		$0x00,%xmm1,%xmm0
	pshufd		$0x55,%xmm1,%xmm1
	movq		0x08(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	movq		0x10(%rdi),%xmm5
	pshufd		$0x00,%xmm5,%xmm4
	pshufd		$0x55,%xmm5,%xmm5
	movq		0x18(%rdi),%xmm7
	pshufd		$0x00,%xmm7,%xmm6
	pshufd		$0x55,%xmm7,%xmm7
	movq		0x20(%rdi),%xmm9
	pshufd		$0x00,%xmm9,%xmm8
	pshufd		$0x55,%xmm9,%xmm9
	movq		0x28(%rdi),%xmm11
	pshufd		$0x00,%xmm11,%xmm10
	pshufd		$0x55,%xmm11,%xmm11
	movq		0x30(%rdi),%xmm13
	pshufd		$0x00,%xmm13,%xmm12
	pshufd		$0x55,%xmm13,%xmm13
	movq		0x38(%rdi),%xmm15
	pshufd		$0x00,%xmm15,%xmm14
	pshufd		$0x55,%xmm15,%xmm15
	# x0..3 on stack
	movdqa		%xmm0,0x00(%rsp)
	movdqa		%xmm1,0x10(%rsp)
	movdqa		%xmm2,0x20(%rsp)
	movdqa		%xmm3,0x30(%rsp)

	movdqa		CTRINC(%rip),%xmm1
	movdqa		ROT8(%rip),%xmm2
	movdqa		ROT16(%rip),%xmm3

	# x12 += counter values 0-3
	paddd		%xmm1,%xmm12

	mov		$10,%ecx

.Ldoubleround4:
	# x0 += x4, x12 = rotl32(x12 ^ x0, 16)
	movdqa		0x00(%rsp),%xmm0
	paddd		%xmm4,%xmm0
	movdqa		%xmm0,0x00(%rsp)
	pxor		%xmm0,%xmm12
	pshufb		%xmm3,%xmm12
	# x1 += x5, x13 = rotl32(x13 ^ x1, 16)
	movdqa		0x10(%rsp),%xmm0
	paddd		%xmm5,%xmm0
	movdqa		%xmm0,0x10(%rsp)
	pxor		%xmm0,%xmm13
	pshufb		%xmm3,%xmm13
	# x2 += x6, x14 = rotl32(x14 ^ x2, 16)
	movdqa		0x20(%rsp),%xmm0
	paddd		%xmm6,%xmm0
	movdqa		%xmm0,0x20(%rsp)
	pxor		%xmm0,%xmm14
	pshufb		%xmm3,%xmm14
	# x3 += x7, x15 = rotl32(x15 ^ x3, 16)
	movdqa		0x30(%rsp),%xmm0
	paddd		%xmm7,%xmm0
	movdqa		%xmm0,0x30(%rsp)
	pxor		%xmm0,%xmm15
	pshufb		%xmm3,%xmm15

	# x8 += x12, x4 = rotl32(x4 ^ x8, 12)
	paddd		%xmm12,%xmm8
	pxor		%xmm8,%xmm4
	movdqa		%xmm4,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm4
	por		%xmm0,%xmm4
	# x9 += x13, x5 = rotl32(x5 ^ x9, 12)
	paddd		%xmm13,%xmm9
	pxor		%xmm9,%xmm5
	movdqa		%xmm5,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm5
	por		%xmm0,%xmm5
	# x10 += x14, x6 = rotl32(x6 ^ x10, 12)
	paddd		%xmm14,%xmm10
	pxor		%xmm10,%xmm6
	movdqa		%xmm6,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm6
	por		%xmm0,%xmm6
	# x11 += x15, x7 = rotl32(x7 ^ x11, 12)
	paddd		%xmm15,%xmm11
	pxor		%xmm11,%xmm7
	movdqa		%xmm7,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm7
	por		%xmm0,%xmm7

	# x0 += x4, x12 = rotl32(x12 ^ x0, 8)
	movdqa		0x00(%rsp),%xmm0
	paddd		%xmm4,%xmm0
	movdqa		%xmm0,0x00(%rsp)
	pxor		%xmm0,%xmm12
	pshufb		%xmm2,%xmm12
	# x1 += x5, x13 = rotl32(x13 ^ x1, 8)
	movdqa		0x10(%rsp),%xmm0
	paddd		%xmm5,%xmm0
	movdqa		%xmm0,0x10(%rsp)
	pxor		%xmm0,%xmm13
	pshufb		%xmm2,%xmm13
	# x2 += x6, x14 = rotl32(x14 ^ x2, 8)
	movdqa		0x20(%rsp),%xmm0
	paddd		%xmm6,%xmm0
	movdqa		%xmm0,0x20(%rsp)
	pxor		%xmm0,%xmm14
	pshufb		%xmm2,%xmm14
	# x3 += x7, x15 = rotl32(x15 ^ x3, 8)
	movdqa		0x30(%rsp),%xmm0
	paddd		%xmm7,%xmm0
	movdqa		%xmm0,0x30(%rsp)
	pxor		%xmm0,%xmm15
	pshufb		%xmm2,%xmm15

	# x8 += x12, x4 = rotl32(x4 ^ x8, 7)
	paddd		%xmm12,%xmm8
	pxor		%xmm8,%xmm4
	movdqa		%xmm4,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm4
	por		%xmm0,%xmm4
	# x9 += x13, x5 = rotl32(x5 ^ x9, 7)
	paddd		%xmm13,%xmm9
	pxor		%xmm9,%xmm5
	movdqa		%xmm5,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm5
	por		%xmm0,%xmm5
	# x10 += x14, x6 = rotl32(x6 ^ x10, 7)
	paddd		%xmm14,%xmm10
	pxor		%xmm10,%xmm6
	movdqa		%xmm6,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm6
	por		%xmm0,%xmm6
	# x11 += x15, x7 = rotl32(x7 ^ x11, 7)
	paddd		%xmm15,%xmm11
	pxor		%xmm11,%xmm7
	movdqa		%xmm7,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm7
	por		%xmm0,%xmm7

	# x0 += x5, x15 = rotl32(x15 ^ x0, 16)
	movdqa		0x00(%rsp),%xmm0
	paddd		%xmm5,%xmm0
	movdqa		%xmm0,0x00(%rsp)
	pxor		%xmm0,%xmm15
	pshufb		%xmm3,%xmm15
	# x1 += x6, x12 = rotl32(x12 ^ x1, 16)
	movdqa		0x10(%rsp),%xmm0
	paddd		%xmm6,%xmm0
	movdqa		%xmm0,0x10(%rsp)
	pxor		%xmm0,%xmm12
	pshufb		%xmm3,%xmm12
	# x2 += x7, x13 = rotl32(x13 ^ x2, 16)
	movdqa		0x20(%rsp),%xmm0
	paddd		%xmm7,%xmm0
	movdqa		%xmm0,0x20(%rsp)
	pxor		%xmm0,%xmm13
	pshufb		%xmm3,%xmm13
	# x3 += x4, x14 = rotl32(x14 ^ x3, 16)
	movdqa		0x30(%rsp),%xmm0
	paddd		%xmm4,%xmm0
	movdqa		%xmm0,0x30(%rsp)
	pxor		%xmm0,%xmm14
	pshufb		%xmm3,%xmm14

	# x10 += x15, x5 = rotl32(x5 ^ x10, 12)
	paddd		%xmm15,%xmm10
	pxor		%xmm10,%xmm5
	movdqa		%xmm5,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm5
	por		%xmm0,%xmm5
	# x11 += x12, x6 = rotl32(x6 ^ x11, 12)
	paddd		%xmm12,%xmm11
	pxor		%xmm11,%xmm6
	movdqa		%xmm6,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm6
	por		%xmm0,%xmm6
	# x8 += x13, x7 = rotl32(x7 ^ x8, 12)
	paddd		%xmm13,%xmm8
	pxor		%xmm8,%xmm7
	movdqa		%xmm7,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm7
	por		%xmm0,%xmm7
	# x9 += x14, x4 = rotl32(x4 ^ x9, 12)
	paddd		%xmm14,%xmm9
	pxor		%xmm9,%xmm4
	movdqa		%xmm4,%xmm0
	pslld		$12,%xmm0
	psrld		$20,%xmm4
	por		%xmm0,%xmm4

	# x0 += x5, x15 = rotl32(x15 ^ x0, 8)
	movdqa		0x00(%rsp),%xmm0
	paddd		%xmm5,%xmm0
	movdqa		%xmm0,0x00(%rsp)
	pxor		%xmm0,%xmm15
	pshufb		%xmm2,%xmm15
	# x1 += x6, x12 = rotl32(x12 ^ x1, 8)
	movdqa		0x10(%rsp),%xmm0
	paddd		%xmm6,%xmm0
	movdqa		%xmm0,0x10(%rsp)
	pxor		%xmm0,%xmm12
	pshufb		%xmm2,%xmm12
	# x2 += x7, x13 = rotl32(x13 ^ x2, 8)
	movdqa		0x20(%rsp),%xmm0
	paddd		%xmm7,%xmm0
	movdqa		%xmm0,0x20(%rsp)
	pxor		%xmm0,%xmm13
	pshufb		%xmm2,%xmm13
	# x3 += x4, x14 = rotl32(x14 ^ x3, 8)
	movdqa		0x30(%rsp),%xmm0
	paddd		%xmm4,%xmm0
	movdqa		%xmm0,0x30(%rsp)
	pxor		%xmm0,%xmm14
	pshufb		%xmm2,%xmm14

	# x10 += x15, x5 = rotl32(x5 ^ x10, 7)
	paddd		%xmm15,%xmm10
	pxor		%xmm10,%xmm5
	movdqa		%xmm5,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm5
	por		%xmm0,%xmm5
	# x11 += x12, x6 = rotl32(x6 ^ x11, 7)
	paddd		%xmm12,%xmm11
	pxor		%xmm11,%xmm6
	movdqa		%xmm6,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm6
	por		%xmm0,%xmm6
	# x8 += x13, x7 = rotl32(x7 ^ x8, 7)
	paddd		%xmm13,%xmm8
	pxor		%xmm8,%xmm7
	movdqa		%xmm7,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm7
	por		%xmm0,%xmm7
	# x9 += x14, x4 = rotl32(x4 ^ x9, 7)
	paddd		%xmm14,%xmm9
	pxor		%xmm9,%xmm4
	movdqa		%xmm4,%xmm0
	pslld		$7,%xmm0
	psrld		$25,%xmm4
	por		%xmm0,%xmm4

	dec		%ecx
	jnz		.Ldoubleround4

	# x0[0-3] += s0[0]
	# x1[0-3] += s0[1]
	movq		0x00(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		0x00(%rsp),%xmm2
	movdqa		%xmm2,0x00(%rsp)
	paddd		0x10(%rsp),%xmm3
	movdqa		%xmm3,0x10(%rsp)
	# x2[0-3] += s0[2]
	# x3[0-3] += s0[3]
	movq		0x08(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		0x20(%rsp),%xmm2
	movdqa		%xmm2,0x20(%rsp)
	paddd		0x30(%rsp),%xmm3
	movdqa		%xmm3,0x30(%rsp)

	# x4[0-3] += s1[0]
	# x5[0-3] += s1[1]
	movq		0x10(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm4
	paddd		%xmm3,%xmm5
	# x6[0-3] += s1[2]
	# x7[0-3] += s1[3]
	movq		0x18(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm6
	paddd		%xmm3,%xmm7

	# x8[0-3] += s2[0]
	# x9[0-3] += s2[1]
	movq		0x20(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm8
	paddd		%xmm3,%xmm9
	# x10[0-3] += s2[2]
	# x11[0-3] += s2[3]
	movq		0x28(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm10
	paddd		%xmm3,%xmm11

	# x12[0-3] += s3[0]
	# x13[0-3] += s3[1]
	movq		0x30(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm12
	paddd		%xmm3,%xmm13
	# x14[0-3] += s3[2]
	# x15[0-3] += s3[3]
	movq		0x38(%rdi),%xmm3
	pshufd		$0x00,%xmm3,%xmm2
	pshufd		$0x55,%xmm3,%xmm3
	paddd		%xmm2,%xmm14
	paddd		%xmm3,%xmm15

	# x12 += counter values 0-3
	paddd		%xmm1,%xmm12

	# interleave 32-bit words in state n, n+1
	movdqa		0x00(%rsp),%xmm0
	movdqa		0x10(%rsp),%xmm1
	movdqa		%xmm0,%xmm2
	punpckldq	%xmm1,%xmm2
	punpckhdq	%xmm1,%xmm0
	movdqa		%xmm2,0x00(%rsp)
	movdqa		%xmm0,0x10(%rsp)
	movdqa		0x20(%rsp),%xmm0
	movdqa		0x30(%rsp),%xmm1
	movdqa		%xmm0,%xmm2
	punpckldq	%xmm1,%xmm2
	punpckhdq	%xmm1,%xmm0
	movdqa		%xmm2,0x20(%rsp)
	movdqa		%xmm0,0x30(%rsp)
	movdqa		%xmm4,%xmm0
	punpckldq	%xmm5,%xmm4
	punpckhdq	%xmm5,%xmm0
	movdqa		%xmm0,%xmm5
	movdqa		%xmm6,%xmm0
	punpckldq	%xmm7,%xmm6
	punpckhdq	%xmm7,%xmm0
	movdqa		%xmm0,%xmm7
	movdqa		%xmm8,%xmm0
	punpckldq	%xmm9,%xmm8
	punpckhdq	%xmm9,%xmm0
	movdqa		%xmm0,%xmm9
	movdqa		%xmm10,%xmm0
	punpckldq	%xmm11,%xmm10
	punpckhdq	%xmm11,%xmm0
	movdqa		%xmm0,%xmm11
	movdqa		%xmm12,%xmm0
	punpckldq	%xmm13,%xmm12
	punpckhdq	%xmm13,%xmm0
	movdqa		%xmm0,%xmm13
	movdqa		%xmm14,%xmm0
	punpckldq	%xmm15,%xmm14
	punpckhdq	%xmm15,%xmm0
	movdqa		%xmm0,%xmm15

	# interleave 64-bit words in state n, n+2
	movdqa		0x00(%rsp),%xmm0
	movdqa		0x20(%rsp),%xmm1
	movdqa		%xmm0,%xmm2
	punpcklqdq	%xmm1,%xmm2
	punpckhqdq	%xmm1,%xmm0
	movdqa		%xmm2,0x00(%rsp)
	movdqa		%xmm0,0x20(%rsp)
	movdqa		0x10(%rsp),%xmm0
	movdqa		0x30(%rsp),%xmm1
	movdqa		%xmm0,%xmm2
	punpcklqdq	%xmm1,%xmm2
	punpckhqdq	%xmm1,%xmm0
	movdqa		%xmm2,0x10(%rsp)
	movdqa		%xmm0,0x30(%rsp)
	movdqa		%xmm4,%xmm0
	punpcklqdq	%xmm6,%xmm4
	punpckhqdq	%xmm6,%xmm0
	movdqa		%xmm0,%xmm6
	movdqa		%xmm5,%xmm0
	punpcklqdq	%xmm7,%xmm5
	punpckhqdq	%xmm7,%xmm0
	movdqa		%xmm0,%xmm7
	movdqa		%xmm8,%xmm0
	punpcklqdq	%xmm10,%xmm8
	punpckhqdq	%xmm10,%xmm0
	movdqa		%xmm0,%xmm10
	movdqa		%xmm9,%xmm0
	punpcklqdq	%xmm11,%xmm9
	punpckhqdq	%xmm11,%xmm0
	movdqa		%xmm0,%xmm11
	movdqa		%xmm12,%xmm0
	punpcklqdq	%xmm14,%xmm12
	punpckhqdq	%xmm14,%xmm0
	movdqa		%xmm0,%xmm14
	movdqa		%xmm13,%xmm0
	punpcklqdq	%xmm15,%xmm13
	punpckhqdq	%xmm15,%xmm0
	movdqa		%xmm0,%xmm15

	# xor with corresponding input, write to output
	movdqa		0x00(%rsp),%xmm0
	cmp		$0x10,%rax
	jl		.Lxorpart4
	movdqu		0x00(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x00(%rsi)

	movdqu		%xmm4,%xmm0
	cmp		$0x20,%rax
	jl		.Lxorpart4
	movdqu		0x10(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x10(%rsi)

	movdqu		%xmm8,%xmm0
	cmp		$0x30,%rax
	jl		.Lxorpart4
	movdqu		0x20(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x20(%rsi)

	movdqu		%xmm12,%xmm0
	cmp		$0x40,%rax
	jl		.Lxorpart4
	movdqu		0x30(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x30(%rsi)

	movdqa		0x20(%rsp),%xmm0
	cmp		$0x50,%rax
	jl		.Lxorpart4
	movdqu		0x40(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x40(%rsi)

	movdqu		%xmm6,%xmm0
	cmp		$0x60,%rax
	jl		.Lxorpart4
	movdqu		0x50(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x50(%rsi)

	movdqu		%xmm10,%xmm0
	cmp		$0x70,%rax
	jl		.Lxorpart4
	movdqu		0x60(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x60(%rsi)

	movdqu		%xmm14,%xmm0
	cmp		$0x80,%rax
	jl		.Lxorpart4
	movdqu		0x70(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x70(%rsi)

	movdqa		0x10(%rsp),%xmm0
	cmp		$0x90,%rax
	jl		.Lxorpart4
	movdqu		0x80(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x80(%rsi)

	movdqu		%xmm5,%xmm0
	cmp		$0xa0,%rax
	jl		.Lxorpart4
	movdqu		0x90(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0x90(%rsi)

	movdqu		%xmm9,%xmm0
	cmp		$0xb0,%rax
	jl		.Lxorpart4
	movdqu		0xa0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xa0(%rsi)

	movdqu		%xmm13,%xmm0
	cmp		$0xc0,%rax
	jl		.Lxorpart4
	movdqu		0xb0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xb0(%rsi)

	movdqa		0x30(%rsp),%xmm0
	cmp		$0xd0,%rax
	jl		.Lxorpart4
	movdqu		0xc0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xc0(%rsi)

	movdqu		%xmm7,%xmm0
	cmp		$0xe0,%rax
	jl		.Lxorpart4
	movdqu		0xd0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xd0(%rsi)

	movdqu		%xmm11,%xmm0
	cmp		$0xf0,%rax
	jl		.Lxorpart4
	movdqu		0xe0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xe0(%rsi)

	movdqu		%xmm15,%xmm0
	cmp		$0x100,%rax
	jl		.Lxorpart4
	movdqu		0xf0(%rdx),%xmm1
	pxor		%xmm1,%xmm0
	movdqu		%xmm0,0xf0(%rsi)

.Ldone4:
	lea		-8(%r10),%rsp
	ret

.Lxorpart4:
	# xor remaining bytes from partial register into output
	mov		%rax,%r9
	and		$0x0f,%r9
	jz		.Ldone4
	and		$~0x0f,%rax

	mov		%rsi,%r11

	lea		(%rdx,%rax),%rsi
	mov		%rsp,%rdi
	mov		%r9,%rcx
	rep movsb

	pxor		0x00(%rsp),%xmm0
	movdqa		%xmm0,0x00(%rsp)

	mov		%rsp,%rsi
	lea		(%r11,%rax),%rdi
	mov		%r9,%rcx
	rep movsb

	jmp		.Ldone4

ENDPROC(chacha20_4block_xor_ssse3)