-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathchacha20poly1305_amd64.s
2715 lines (2395 loc) · 106 KB
/
chacha20poly1305_amd64.s
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
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file was originally from https://golang.org/cl/24717 by Vlad Krasnov of CloudFlare.
//go:build gc && !purego
#include "textflag.h"
// General register allocation
#define oup DI
#define inp SI
#define inl BX
#define adp CX // free to reuse, after we hash the additional data
#define keyp R8 // free to reuse, when we copy the key to stack
#define itr2 R9 // general iterator
#define itr1 CX // general iterator
#define acc0 R10
#define acc1 R11
#define acc2 R12
#define t0 R13
#define t1 R14
#define t2 R15
#define t3 R8
// Register and stack allocation for the SSE code
#define rStore (0*16)(BP)
#define sStore (1*16)(BP)
#define state1Store (2*16)(BP)
#define state2Store (3*16)(BP)
#define tmpStore (4*16)(BP)
#define ctr0Store (5*16)(BP)
#define ctr1Store (6*16)(BP)
#define ctr2Store (7*16)(BP)
#define ctr3Store (8*16)(BP)
#define A0 X0
#define A1 X1
#define A2 X2
#define B0 X3
#define B1 X4
#define B2 X5
#define C0 X6
#define C1 X7
#define C2 X8
#define D0 X9
#define D1 X10
#define D2 X11
#define T0 X12
#define T1 X13
#define T2 X14
#define T3 X15
#define A3 T0
#define B3 T1
#define C3 T2
#define D3 T3
// Register and stack allocation for the AVX2 code
#define rsStoreAVX2 (0*32)(BP)
#define state1StoreAVX2 (1*32)(BP)
#define state2StoreAVX2 (2*32)(BP)
#define ctr0StoreAVX2 (3*32)(BP)
#define ctr1StoreAVX2 (4*32)(BP)
#define ctr2StoreAVX2 (5*32)(BP)
#define ctr3StoreAVX2 (6*32)(BP)
#define tmpStoreAVX2 (7*32)(BP) // 256 bytes on stack
#define AA0 Y0
#define AA1 Y5
#define AA2 Y6
#define AA3 Y7
#define BB0 Y14
#define BB1 Y9
#define BB2 Y10
#define BB3 Y11
#define CC0 Y12
#define CC1 Y13
#define CC2 Y8
#define CC3 Y15
#define DD0 Y4
#define DD1 Y1
#define DD2 Y2
#define DD3 Y3
#define TT0 DD3
#define TT1 AA3
#define TT2 BB3
#define TT3 CC3
// ChaCha20 constants
DATA ·chacha20Constants<>+0x00(SB)/4, $0x61707865
DATA ·chacha20Constants<>+0x04(SB)/4, $0x3320646e
DATA ·chacha20Constants<>+0x08(SB)/4, $0x79622d32
DATA ·chacha20Constants<>+0x0c(SB)/4, $0x6b206574
DATA ·chacha20Constants<>+0x10(SB)/4, $0x61707865
DATA ·chacha20Constants<>+0x14(SB)/4, $0x3320646e
DATA ·chacha20Constants<>+0x18(SB)/4, $0x79622d32
DATA ·chacha20Constants<>+0x1c(SB)/4, $0x6b206574
// <<< 16 with PSHUFB
DATA ·rol16<>+0x00(SB)/8, $0x0504070601000302
DATA ·rol16<>+0x08(SB)/8, $0x0D0C0F0E09080B0A
DATA ·rol16<>+0x10(SB)/8, $0x0504070601000302
DATA ·rol16<>+0x18(SB)/8, $0x0D0C0F0E09080B0A
// <<< 8 with PSHUFB
DATA ·rol8<>+0x00(SB)/8, $0x0605040702010003
DATA ·rol8<>+0x08(SB)/8, $0x0E0D0C0F0A09080B
DATA ·rol8<>+0x10(SB)/8, $0x0605040702010003
DATA ·rol8<>+0x18(SB)/8, $0x0E0D0C0F0A09080B
DATA ·avx2InitMask<>+0x00(SB)/8, $0x0
DATA ·avx2InitMask<>+0x08(SB)/8, $0x0
DATA ·avx2InitMask<>+0x10(SB)/8, $0x1
DATA ·avx2InitMask<>+0x18(SB)/8, $0x0
DATA ·avx2IncMask<>+0x00(SB)/8, $0x2
DATA ·avx2IncMask<>+0x08(SB)/8, $0x0
DATA ·avx2IncMask<>+0x10(SB)/8, $0x2
DATA ·avx2IncMask<>+0x18(SB)/8, $0x0
// Poly1305 key clamp
DATA ·polyClampMask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
DATA ·polyClampMask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
DATA ·polyClampMask<>+0x10(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA ·polyClampMask<>+0x18(SB)/8, $0xFFFFFFFFFFFFFFFF
DATA ·sseIncMask<>+0x00(SB)/8, $0x1
DATA ·sseIncMask<>+0x08(SB)/8, $0x0
// To load/store the last < 16 bytes in a buffer
DATA ·andMask<>+0x00(SB)/8, $0x00000000000000ff
DATA ·andMask<>+0x08(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x10(SB)/8, $0x000000000000ffff
DATA ·andMask<>+0x18(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x20(SB)/8, $0x0000000000ffffff
DATA ·andMask<>+0x28(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x30(SB)/8, $0x00000000ffffffff
DATA ·andMask<>+0x38(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x40(SB)/8, $0x000000ffffffffff
DATA ·andMask<>+0x48(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x50(SB)/8, $0x0000ffffffffffff
DATA ·andMask<>+0x58(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x60(SB)/8, $0x00ffffffffffffff
DATA ·andMask<>+0x68(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x70(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0x78(SB)/8, $0x0000000000000000
DATA ·andMask<>+0x80(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0x88(SB)/8, $0x00000000000000ff
DATA ·andMask<>+0x90(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0x98(SB)/8, $0x000000000000ffff
DATA ·andMask<>+0xa0(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0xa8(SB)/8, $0x0000000000ffffff
DATA ·andMask<>+0xb0(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0xb8(SB)/8, $0x00000000ffffffff
DATA ·andMask<>+0xc0(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0xc8(SB)/8, $0x000000ffffffffff
DATA ·andMask<>+0xd0(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0xd8(SB)/8, $0x0000ffffffffffff
DATA ·andMask<>+0xe0(SB)/8, $0xffffffffffffffff
DATA ·andMask<>+0xe8(SB)/8, $0x00ffffffffffffff
GLOBL ·chacha20Constants<>(SB), (NOPTR+RODATA), $32
GLOBL ·rol16<>(SB), (NOPTR+RODATA), $32
GLOBL ·rol8<>(SB), (NOPTR+RODATA), $32
GLOBL ·sseIncMask<>(SB), (NOPTR+RODATA), $16
GLOBL ·avx2IncMask<>(SB), (NOPTR+RODATA), $32
GLOBL ·avx2InitMask<>(SB), (NOPTR+RODATA), $32
GLOBL ·polyClampMask<>(SB), (NOPTR+RODATA), $32
GLOBL ·andMask<>(SB), (NOPTR+RODATA), $240
// No PALIGNR in Go ASM yet (but VPALIGNR is present).
#define shiftB0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X3, X3
#define shiftB1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x04 // PALIGNR $4, X4, X4
#define shiftB2Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X5, X5
#define shiftB3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x04 // PALIGNR $4, X13, X13
#define shiftC0Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X6, X6
#define shiftC1Left BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x08 // PALIGNR $8, X7, X7
#define shiftC2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc0; BYTE $0x08 // PALIGNR $8, X8, X8
#define shiftC3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xf6; BYTE $0x08 // PALIGNR $8, X14, X14
#define shiftD0Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x0c // PALIGNR $12, X9, X9
#define shiftD1Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x0c // PALIGNR $12, X10, X10
#define shiftD2Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X11, X11
#define shiftD3Left BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x0c // PALIGNR $12, X15, X15
#define shiftB0Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x0c // PALIGNR $12, X3, X3
#define shiftB1Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xe4; BYTE $0x0c // PALIGNR $12, X4, X4
#define shiftB2Right BYTE $0x66; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X5, X5
#define shiftB3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xed; BYTE $0x0c // PALIGNR $12, X13, X13
#define shiftC0Right shiftC0Left
#define shiftC1Right shiftC1Left
#define shiftC2Right shiftC2Left
#define shiftC3Right shiftC3Left
#define shiftD0Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xc9; BYTE $0x04 // PALIGNR $4, X9, X9
#define shiftD1Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xd2; BYTE $0x04 // PALIGNR $4, X10, X10
#define shiftD2Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xdb; BYTE $0x04 // PALIGNR $4, X11, X11
#define shiftD3Right BYTE $0x66; BYTE $0x45; BYTE $0x0f; BYTE $0x3a; BYTE $0x0f; BYTE $0xff; BYTE $0x04 // PALIGNR $4, X15, X15
// Some macros
// ROL rotates the uint32s in register R left by N bits, using temporary T.
#define ROL(N, R, T) \
MOVO R, T; PSLLL $(N), T; PSRLL $(32-(N)), R; PXOR T, R
// ROL16 rotates the uint32s in register R left by 16, using temporary T if needed.
#ifdef GOAMD64_v2
#define ROL16(R, T) PSHUFB ·rol16<>(SB), R
#else
#define ROL16(R, T) ROL(16, R, T)
#endif
// ROL8 rotates the uint32s in register R left by 8, using temporary T if needed.
#ifdef GOAMD64_v2
#define ROL8(R, T) PSHUFB ·rol8<>(SB), R
#else
#define ROL8(R, T) ROL(8, R, T)
#endif
#define chachaQR(A, B, C, D, T) \
PADDD B, A; PXOR A, D; ROL16(D, T) \
PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $12, T; PSRLL $20, B; PXOR T, B \
PADDD B, A; PXOR A, D; ROL8(D, T) \
PADDD D, C; PXOR C, B; MOVO B, T; PSLLL $7, T; PSRLL $25, B; PXOR T, B
#define chachaQR_AVX2(A, B, C, D, T) \
VPADDD B, A, A; VPXOR A, D, D; VPSHUFB ·rol16<>(SB), D, D \
VPADDD D, C, C; VPXOR C, B, B; VPSLLD $12, B, T; VPSRLD $20, B, B; VPXOR T, B, B \
VPADDD B, A, A; VPXOR A, D, D; VPSHUFB ·rol8<>(SB), D, D \
VPADDD D, C, C; VPXOR C, B, B; VPSLLD $7, B, T; VPSRLD $25, B, B; VPXOR T, B, B
#define polyAdd(S) ADDQ S, acc0; ADCQ 8+S, acc1; ADCQ $1, acc2
#define polyMulStage1 MOVQ (0*8)(BP), AX; MOVQ AX, t2; MULQ acc0; MOVQ AX, t0; MOVQ DX, t1; MOVQ (0*8)(BP), AX; MULQ acc1; IMULQ acc2, t2; ADDQ AX, t1; ADCQ DX, t2
#define polyMulStage2 MOVQ (1*8)(BP), AX; MOVQ AX, t3; MULQ acc0; ADDQ AX, t1; ADCQ $0, DX; MOVQ DX, acc0; MOVQ (1*8)(BP), AX; MULQ acc1; ADDQ AX, t2; ADCQ $0, DX
#define polyMulStage3 IMULQ acc2, t3; ADDQ acc0, t2; ADCQ DX, t3
#define polyMulReduceStage MOVQ t0, acc0; MOVQ t1, acc1; MOVQ t2, acc2; ANDQ $3, acc2; MOVQ t2, t0; ANDQ $-4, t0; MOVQ t3, t1; SHRQ $2, t3, t2; SHRQ $2, t3; ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $0, acc2; ADDQ t2, acc0; ADCQ t3, acc1; ADCQ $0, acc2
#define polyMulStage1_AVX2 MOVQ (0*8)(BP), DX; MOVQ DX, t2; MULXQ acc0, t0, t1; IMULQ acc2, t2; MULXQ acc1, AX, DX; ADDQ AX, t1; ADCQ DX, t2
#define polyMulStage2_AVX2 MOVQ (1*8)(BP), DX; MULXQ acc0, acc0, AX; ADDQ acc0, t1; MULXQ acc1, acc1, t3; ADCQ acc1, t2; ADCQ $0, t3
#define polyMulStage3_AVX2 IMULQ acc2, DX; ADDQ AX, t2; ADCQ DX, t3
#define polyMul polyMulStage1; polyMulStage2; polyMulStage3; polyMulReduceStage
#define polyMulAVX2 polyMulStage1_AVX2; polyMulStage2_AVX2; polyMulStage3_AVX2; polyMulReduceStage
// ----------------------------------------------------------------------------
TEXT polyHashADInternal<>(SB), NOSPLIT, $0
// adp points to beginning of additional data
// itr2 holds ad length
XORQ acc0, acc0
XORQ acc1, acc1
XORQ acc2, acc2
CMPQ itr2, $13
JNE hashADLoop
openFastTLSAD:
// Special treatment for the TLS case of 13 bytes
MOVQ (adp), acc0
MOVQ 5(adp), acc1
SHRQ $24, acc1
MOVQ $1, acc2
polyMul
RET
hashADLoop:
// Hash in 16 byte chunks
CMPQ itr2, $16
JB hashADTail
polyAdd(0(adp))
LEAQ (1*16)(adp), adp
SUBQ $16, itr2
polyMul
JMP hashADLoop
hashADTail:
CMPQ itr2, $0
JE hashADDone
// Hash last < 16 byte tail
XORQ t0, t0
XORQ t1, t1
XORQ t2, t2
ADDQ itr2, adp
hashADTailLoop:
SHLQ $8, t0, t1
SHLQ $8, t0
MOVB -1(adp), t2
XORQ t2, t0
DECQ adp
DECQ itr2
JNE hashADTailLoop
hashADTailFinish:
ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
polyMul
// Finished AD
hashADDone:
RET
// ----------------------------------------------------------------------------
// func chacha20Poly1305Open(dst, key, src, ad []byte) bool
TEXT ·chacha20Poly1305Open(SB), 0, $288-97
// For aligned stack access
MOVQ SP, BP
ADDQ $32, BP
ANDQ $-32, BP
MOVQ dst+0(FP), oup
MOVQ key+24(FP), keyp
MOVQ src+48(FP), inp
MOVQ src_len+56(FP), inl
MOVQ ad+72(FP), adp
// Check for AVX2 support
CMPB ·useAVX2(SB), $1
JE chacha20Poly1305Open_AVX2
// Special optimization, for very short buffers
CMPQ inl, $128
JBE openSSE128 // About 16% faster
// For long buffers, prepare the poly key first
MOVOU ·chacha20Constants<>(SB), A0
MOVOU (1*16)(keyp), B0
MOVOU (2*16)(keyp), C0
MOVOU (3*16)(keyp), D0
MOVO D0, T1
// Store state on stack for future use
MOVO B0, state1Store
MOVO C0, state2Store
MOVO D0, ctr3Store
MOVQ $10, itr2
openSSEPreparePolyKey:
chachaQR(A0, B0, C0, D0, T0)
shiftB0Left; shiftC0Left; shiftD0Left
chachaQR(A0, B0, C0, D0, T0)
shiftB0Right; shiftC0Right; shiftD0Right
DECQ itr2
JNE openSSEPreparePolyKey
// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
PADDL ·chacha20Constants<>(SB), A0; PADDL state1Store, B0
// Clamp and store the key
PAND ·polyClampMask<>(SB), A0
MOVO A0, rStore; MOVO B0, sStore
// Hash AAD
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal<>(SB)
openSSEMainLoop:
CMPQ inl, $256
JB openSSEMainLoopDone
// Load state, increment counter blocks
MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
// Store counters
MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
// There are 10 ChaCha20 iterations of 2QR each, so for 6 iterations we hash 2 blocks, and for the remaining 4 only 1 block - for a total of 16
MOVQ $4, itr1
MOVQ inp, itr2
openSSEInternalLoop:
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyAdd(0(itr2))
shiftB0Left; shiftB1Left; shiftB2Left; shiftB3Left
shiftC0Left; shiftC1Left; shiftC2Left; shiftC3Left
shiftD0Left; shiftD1Left; shiftD2Left; shiftD3Left
polyMulStage1
polyMulStage2
LEAQ (2*8)(itr2), itr2
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
polyMulStage3
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyMulReduceStage
shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
DECQ itr1
JGE openSSEInternalLoop
polyAdd(0(itr2))
polyMul
LEAQ (2*8)(itr2), itr2
CMPQ itr1, $-6
JG openSSEInternalLoop
// Add in the state
PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
// Load - xor - store
MOVO D3, tmpStore
MOVOU (0*16)(inp), D3; PXOR D3, A0; MOVOU A0, (0*16)(oup)
MOVOU (1*16)(inp), D3; PXOR D3, B0; MOVOU B0, (1*16)(oup)
MOVOU (2*16)(inp), D3; PXOR D3, C0; MOVOU C0, (2*16)(oup)
MOVOU (3*16)(inp), D3; PXOR D3, D0; MOVOU D0, (3*16)(oup)
MOVOU (4*16)(inp), D0; PXOR D0, A1; MOVOU A1, (4*16)(oup)
MOVOU (5*16)(inp), D0; PXOR D0, B1; MOVOU B1, (5*16)(oup)
MOVOU (6*16)(inp), D0; PXOR D0, C1; MOVOU C1, (6*16)(oup)
MOVOU (7*16)(inp), D0; PXOR D0, D1; MOVOU D1, (7*16)(oup)
MOVOU (8*16)(inp), D0; PXOR D0, A2; MOVOU A2, (8*16)(oup)
MOVOU (9*16)(inp), D0; PXOR D0, B2; MOVOU B2, (9*16)(oup)
MOVOU (10*16)(inp), D0; PXOR D0, C2; MOVOU C2, (10*16)(oup)
MOVOU (11*16)(inp), D0; PXOR D0, D2; MOVOU D2, (11*16)(oup)
MOVOU (12*16)(inp), D0; PXOR D0, A3; MOVOU A3, (12*16)(oup)
MOVOU (13*16)(inp), D0; PXOR D0, B3; MOVOU B3, (13*16)(oup)
MOVOU (14*16)(inp), D0; PXOR D0, C3; MOVOU C3, (14*16)(oup)
MOVOU (15*16)(inp), D0; PXOR tmpStore, D0; MOVOU D0, (15*16)(oup)
LEAQ 256(inp), inp
LEAQ 256(oup), oup
SUBQ $256, inl
JMP openSSEMainLoop
openSSEMainLoopDone:
// Handle the various tail sizes efficiently
TESTQ inl, inl
JE openSSEFinalize
CMPQ inl, $64
JBE openSSETail64
CMPQ inl, $128
JBE openSSETail128
CMPQ inl, $192
JBE openSSETail192
JMP openSSETail256
openSSEFinalize:
// Hash in the PT, AAD lengths
ADDQ ad_len+80(FP), acc0; ADCQ src_len+56(FP), acc1; ADCQ $1, acc2
polyMul
// Final reduce
MOVQ acc0, t0
MOVQ acc1, t1
MOVQ acc2, t2
SUBQ $-5, acc0
SBBQ $-1, acc1
SBBQ $3, acc2
CMOVQCS t0, acc0
CMOVQCS t1, acc1
CMOVQCS t2, acc2
// Add in the "s" part of the key
ADDQ 0+sStore, acc0
ADCQ 8+sStore, acc1
// Finally, constant time compare to the tag at the end of the message
XORQ AX, AX
MOVQ $1, DX
XORQ (0*8)(inp), acc0
XORQ (1*8)(inp), acc1
ORQ acc1, acc0
CMOVQEQ DX, AX
// Return true iff tags are equal
MOVB AX, ret+96(FP)
RET
// ----------------------------------------------------------------------------
// Special optimization for buffers smaller than 129 bytes
openSSE128:
// For up to 128 bytes of ciphertext and 64 bytes for the poly key, we require to process three blocks
MOVOU ·chacha20Constants<>(SB), A0; MOVOU (1*16)(keyp), B0; MOVOU (2*16)(keyp), C0; MOVOU (3*16)(keyp), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
MOVO B0, T1; MOVO C0, T2; MOVO D1, T3
MOVQ $10, itr2
openSSE128InnerCipherLoop:
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Left; shiftB1Left; shiftB2Left
shiftC0Left; shiftC1Left; shiftC2Left
shiftD0Left; shiftD1Left; shiftD2Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Right; shiftB1Right; shiftB2Right
shiftC0Right; shiftC1Right; shiftC2Right
shiftD0Right; shiftD1Right; shiftD2Right
DECQ itr2
JNE openSSE128InnerCipherLoop
// A0|B0 hold the Poly1305 32-byte key, C0,D0 can be discarded
PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
PADDL T1, B0; PADDL T1, B1; PADDL T1, B2
PADDL T2, C1; PADDL T2, C2
PADDL T3, D1; PADDL ·sseIncMask<>(SB), T3; PADDL T3, D2
// Clamp and store the key
PAND ·polyClampMask<>(SB), A0
MOVOU A0, rStore; MOVOU B0, sStore
// Hash
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal<>(SB)
openSSE128Open:
CMPQ inl, $16
JB openSSETail16
SUBQ $16, inl
// Load for hashing
polyAdd(0(inp))
// Load for decryption
MOVOU (inp), T0; PXOR T0, A1; MOVOU A1, (oup)
LEAQ (1*16)(inp), inp
LEAQ (1*16)(oup), oup
polyMul
// Shift the stream "left"
MOVO B1, A1
MOVO C1, B1
MOVO D1, C1
MOVO A2, D1
MOVO B2, A2
MOVO C2, B2
MOVO D2, C2
JMP openSSE128Open
openSSETail16:
TESTQ inl, inl
JE openSSEFinalize
// We can safely load the CT from the end, because it is padded with the MAC
MOVQ inl, itr2
SHLQ $4, itr2
LEAQ ·andMask<>(SB), t0
MOVOU (inp), T0
ADDQ inl, inp
PAND -16(t0)(itr2*1), T0
MOVO T0, 0+tmpStore
MOVQ T0, t0
MOVQ 8+tmpStore, t1
PXOR A1, T0
// We can only store one byte at a time, since plaintext can be shorter than 16 bytes
openSSETail16Store:
MOVQ T0, t3
MOVB t3, (oup)
PSRLDQ $1, T0
INCQ oup
DECQ inl
JNE openSSETail16Store
ADDQ t0, acc0; ADCQ t1, acc1; ADCQ $1, acc2
polyMul
JMP openSSEFinalize
// ----------------------------------------------------------------------------
// Special optimization for the last 64 bytes of ciphertext
openSSETail64:
// Need to decrypt up to 64 bytes - prepare single block
MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr0Store
XORQ itr2, itr2
MOVQ inl, itr1
CMPQ itr1, $16
JB openSSETail64LoopB
openSSETail64LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
SUBQ $16, itr1
openSSETail64LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0)
shiftB0Left; shiftC0Left; shiftD0Left
chachaQR(A0, B0, C0, D0, T0)
shiftB0Right; shiftC0Right; shiftD0Right
CMPQ itr1, $16
JAE openSSETail64LoopA
CMPQ itr2, $160
JNE openSSETail64LoopB
PADDL ·chacha20Constants<>(SB), A0; PADDL state1Store, B0; PADDL state2Store, C0; PADDL ctr0Store, D0
openSSETail64DecLoop:
CMPQ inl, $16
JB openSSETail64DecLoopDone
SUBQ $16, inl
MOVOU (inp), T0
PXOR T0, A0
MOVOU A0, (oup)
LEAQ 16(inp), inp
LEAQ 16(oup), oup
MOVO B0, A0
MOVO C0, B0
MOVO D0, C0
JMP openSSETail64DecLoop
openSSETail64DecLoopDone:
MOVO A0, A1
JMP openSSETail16
// ----------------------------------------------------------------------------
// Special optimization for the last 128 bytes of ciphertext
openSSETail128:
// Need to decrypt up to 128 bytes - prepare two blocks
MOVO ·chacha20Constants<>(SB), A1; MOVO state1Store, B1; MOVO state2Store, C1; MOVO ctr3Store, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr0Store
MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr1Store
XORQ itr2, itr2
MOVQ inl, itr1
ANDQ $-16, itr1
openSSETail128LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
openSSETail128LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
shiftB0Left; shiftC0Left; shiftD0Left
shiftB1Left; shiftC1Left; shiftD1Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0)
shiftB0Right; shiftC0Right; shiftD0Right
shiftB1Right; shiftC1Right; shiftD1Right
CMPQ itr2, itr1
JB openSSETail128LoopA
CMPQ itr2, $160
JNE openSSETail128LoopB
PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1
PADDL state1Store, B0; PADDL state1Store, B1
PADDL state2Store, C0; PADDL state2Store, C1
PADDL ctr1Store, D0; PADDL ctr0Store, D1
MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
PXOR T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
MOVOU A1, (0*16)(oup); MOVOU B1, (1*16)(oup); MOVOU C1, (2*16)(oup); MOVOU D1, (3*16)(oup)
SUBQ $64, inl
LEAQ 64(inp), inp
LEAQ 64(oup), oup
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// Special optimization for the last 192 bytes of ciphertext
openSSETail192:
// Need to decrypt up to 192 bytes - prepare three blocks
MOVO ·chacha20Constants<>(SB), A2; MOVO state1Store, B2; MOVO state2Store, C2; MOVO ctr3Store, D2; PADDL ·sseIncMask<>(SB), D2; MOVO D2, ctr0Store
MOVO A2, A1; MOVO B2, B1; MOVO C2, C1; MOVO D2, D1; PADDL ·sseIncMask<>(SB), D1; MOVO D1, ctr1Store
MOVO A1, A0; MOVO B1, B0; MOVO C1, C0; MOVO D1, D0; PADDL ·sseIncMask<>(SB), D0; MOVO D0, ctr2Store
MOVQ inl, itr1
MOVQ $160, itr2
CMPQ itr1, $160
CMOVQGT itr2, itr1
ANDQ $-16, itr1
XORQ itr2, itr2
openSSLTail192LoopA:
// Perform ChaCha rounds, while hashing the remaining input
polyAdd(0(inp)(itr2*1))
polyMul
openSSLTail192LoopB:
ADDQ $16, itr2
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Left; shiftC0Left; shiftD0Left
shiftB1Left; shiftC1Left; shiftD1Left
shiftB2Left; shiftC2Left; shiftD2Left
chachaQR(A0, B0, C0, D0, T0); chachaQR(A1, B1, C1, D1, T0); chachaQR(A2, B2, C2, D2, T0)
shiftB0Right; shiftC0Right; shiftD0Right
shiftB1Right; shiftC1Right; shiftD1Right
shiftB2Right; shiftC2Right; shiftD2Right
CMPQ itr2, itr1
JB openSSLTail192LoopA
CMPQ itr2, $160
JNE openSSLTail192LoopB
CMPQ inl, $176
JB openSSLTail192Store
polyAdd(160(inp))
polyMul
CMPQ inl, $192
JB openSSLTail192Store
polyAdd(176(inp))
polyMul
openSSLTail192Store:
PADDL ·chacha20Constants<>(SB), A0; PADDL ·chacha20Constants<>(SB), A1; PADDL ·chacha20Constants<>(SB), A2
PADDL state1Store, B0; PADDL state1Store, B1; PADDL state1Store, B2
PADDL state2Store, C0; PADDL state2Store, C1; PADDL state2Store, C2
PADDL ctr2Store, D0; PADDL ctr1Store, D1; PADDL ctr0Store, D2
MOVOU (0*16)(inp), T0; MOVOU (1*16)(inp), T1; MOVOU (2*16)(inp), T2; MOVOU (3*16)(inp), T3
PXOR T0, A2; PXOR T1, B2; PXOR T2, C2; PXOR T3, D2
MOVOU A2, (0*16)(oup); MOVOU B2, (1*16)(oup); MOVOU C2, (2*16)(oup); MOVOU D2, (3*16)(oup)
MOVOU (4*16)(inp), T0; MOVOU (5*16)(inp), T1; MOVOU (6*16)(inp), T2; MOVOU (7*16)(inp), T3
PXOR T0, A1; PXOR T1, B1; PXOR T2, C1; PXOR T3, D1
MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
SUBQ $128, inl
LEAQ 128(inp), inp
LEAQ 128(oup), oup
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// Special optimization for the last 256 bytes of ciphertext
openSSETail256:
// Need to decrypt up to 256 bytes - prepare four blocks
MOVO ·chacha20Constants<>(SB), A0; MOVO state1Store, B0; MOVO state2Store, C0; MOVO ctr3Store, D0; PADDL ·sseIncMask<>(SB), D0
MOVO A0, A1; MOVO B0, B1; MOVO C0, C1; MOVO D0, D1; PADDL ·sseIncMask<>(SB), D1
MOVO A1, A2; MOVO B1, B2; MOVO C1, C2; MOVO D1, D2; PADDL ·sseIncMask<>(SB), D2
MOVO A2, A3; MOVO B2, B3; MOVO C2, C3; MOVO D2, D3; PADDL ·sseIncMask<>(SB), D3
// Store counters
MOVO D0, ctr0Store; MOVO D1, ctr1Store; MOVO D2, ctr2Store; MOVO D3, ctr3Store
XORQ itr2, itr2
openSSETail256Loop:
// This loop inteleaves 8 ChaCha quarter rounds with 1 poly multiplication
polyAdd(0(inp)(itr2*1))
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
shiftB0Left; shiftB1Left; shiftB2Left; shiftB3Left
shiftC0Left; shiftC1Left; shiftC2Left; shiftC3Left
shiftD0Left; shiftD1Left; shiftD2Left; shiftD3Left
polyMulStage1
polyMulStage2
MOVO C3, tmpStore
chachaQR(A0, B0, C0, D0, C3); chachaQR(A1, B1, C1, D1, C3); chachaQR(A2, B2, C2, D2, C3)
MOVO tmpStore, C3
MOVO C1, tmpStore
chachaQR(A3, B3, C3, D3, C1)
MOVO tmpStore, C1
polyMulStage3
polyMulReduceStage
shiftB0Right; shiftB1Right; shiftB2Right; shiftB3Right
shiftC0Right; shiftC1Right; shiftC2Right; shiftC3Right
shiftD0Right; shiftD1Right; shiftD2Right; shiftD3Right
ADDQ $2*8, itr2
CMPQ itr2, $160
JB openSSETail256Loop
MOVQ inl, itr1
ANDQ $-16, itr1
openSSETail256HashLoop:
polyAdd(0(inp)(itr2*1))
polyMul
ADDQ $2*8, itr2
CMPQ itr2, itr1
JB openSSETail256HashLoop
// Add in the state
PADDD ·chacha20Constants<>(SB), A0; PADDD ·chacha20Constants<>(SB), A1; PADDD ·chacha20Constants<>(SB), A2; PADDD ·chacha20Constants<>(SB), A3
PADDD state1Store, B0; PADDD state1Store, B1; PADDD state1Store, B2; PADDD state1Store, B3
PADDD state2Store, C0; PADDD state2Store, C1; PADDD state2Store, C2; PADDD state2Store, C3
PADDD ctr0Store, D0; PADDD ctr1Store, D1; PADDD ctr2Store, D2; PADDD ctr3Store, D3
MOVO D3, tmpStore
// Load - xor - store
MOVOU (0*16)(inp), D3; PXOR D3, A0
MOVOU (1*16)(inp), D3; PXOR D3, B0
MOVOU (2*16)(inp), D3; PXOR D3, C0
MOVOU (3*16)(inp), D3; PXOR D3, D0
MOVOU A0, (0*16)(oup)
MOVOU B0, (1*16)(oup)
MOVOU C0, (2*16)(oup)
MOVOU D0, (3*16)(oup)
MOVOU (4*16)(inp), A0; MOVOU (5*16)(inp), B0; MOVOU (6*16)(inp), C0; MOVOU (7*16)(inp), D0
PXOR A0, A1; PXOR B0, B1; PXOR C0, C1; PXOR D0, D1
MOVOU A1, (4*16)(oup); MOVOU B1, (5*16)(oup); MOVOU C1, (6*16)(oup); MOVOU D1, (7*16)(oup)
MOVOU (8*16)(inp), A0; MOVOU (9*16)(inp), B0; MOVOU (10*16)(inp), C0; MOVOU (11*16)(inp), D0
PXOR A0, A2; PXOR B0, B2; PXOR C0, C2; PXOR D0, D2
MOVOU A2, (8*16)(oup); MOVOU B2, (9*16)(oup); MOVOU C2, (10*16)(oup); MOVOU D2, (11*16)(oup)
LEAQ 192(inp), inp
LEAQ 192(oup), oup
SUBQ $192, inl
MOVO A3, A0
MOVO B3, B0
MOVO C3, C0
MOVO tmpStore, D0
JMP openSSETail64DecLoop
// ----------------------------------------------------------------------------
// ------------------------- AVX2 Code ----------------------------------------
chacha20Poly1305Open_AVX2:
VZEROUPPER
VMOVDQU ·chacha20Constants<>(SB), AA0
BYTE $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x70; BYTE $0x10 // broadcasti128 16(r8), ymm14
BYTE $0xc4; BYTE $0x42; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x20 // broadcasti128 32(r8), ymm12
BYTE $0xc4; BYTE $0xc2; BYTE $0x7d; BYTE $0x5a; BYTE $0x60; BYTE $0x30 // broadcasti128 48(r8), ymm4
VPADDD ·avx2InitMask<>(SB), DD0, DD0
// Special optimization, for very short buffers
CMPQ inl, $192
JBE openAVX2192
CMPQ inl, $320
JBE openAVX2320
// For the general key prepare the key first - as a byproduct we have 64 bytes of cipher stream
VMOVDQA BB0, state1StoreAVX2
VMOVDQA CC0, state2StoreAVX2
VMOVDQA DD0, ctr3StoreAVX2
MOVQ $10, itr2
openAVX2PreparePolyKey:
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $12, DD0, DD0, DD0
chachaQR_AVX2(AA0, BB0, CC0, DD0, TT0)
VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $4, DD0, DD0, DD0
DECQ itr2
JNE openAVX2PreparePolyKey
VPADDD ·chacha20Constants<>(SB), AA0, AA0
VPADDD state1StoreAVX2, BB0, BB0
VPADDD state2StoreAVX2, CC0, CC0
VPADDD ctr3StoreAVX2, DD0, DD0
VPERM2I128 $0x02, AA0, BB0, TT0
// Clamp and store poly key
VPAND ·polyClampMask<>(SB), TT0, TT0
VMOVDQA TT0, rsStoreAVX2
// Stream for the first 64 bytes
VPERM2I128 $0x13, AA0, BB0, AA0
VPERM2I128 $0x13, CC0, DD0, BB0
// Hash AD + first 64 bytes
MOVQ ad_len+80(FP), itr2
CALL polyHashADInternal<>(SB)
XORQ itr1, itr1
openAVX2InitialHash64:
polyAdd(0(inp)(itr1*1))
polyMulAVX2
ADDQ $16, itr1
CMPQ itr1, $64
JNE openAVX2InitialHash64
// Decrypt the first 64 bytes
VPXOR (0*32)(inp), AA0, AA0
VPXOR (1*32)(inp), BB0, BB0
VMOVDQU AA0, (0*32)(oup)
VMOVDQU BB0, (1*32)(oup)
LEAQ (2*32)(inp), inp
LEAQ (2*32)(oup), oup
SUBQ $64, inl
openAVX2MainLoop:
CMPQ inl, $512
JB openAVX2MainLoopDone
// Load state, increment counter blocks, store the incremented counters
VMOVDQU ·chacha20Constants<>(SB), AA0; VMOVDQA AA0, AA1; VMOVDQA AA0, AA2; VMOVDQA AA0, AA3
VMOVDQA state1StoreAVX2, BB0; VMOVDQA BB0, BB1; VMOVDQA BB0, BB2; VMOVDQA BB0, BB3
VMOVDQA state2StoreAVX2, CC0; VMOVDQA CC0, CC1; VMOVDQA CC0, CC2; VMOVDQA CC0, CC3
VMOVDQA ctr3StoreAVX2, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD0; VPADDD ·avx2IncMask<>(SB), DD0, DD1; VPADDD ·avx2IncMask<>(SB), DD1, DD2; VPADDD ·avx2IncMask<>(SB), DD2, DD3
VMOVDQA DD0, ctr0StoreAVX2; VMOVDQA DD1, ctr1StoreAVX2; VMOVDQA DD2, ctr2StoreAVX2; VMOVDQA DD3, ctr3StoreAVX2
XORQ itr1, itr1
openAVX2InternalLoop:
// Lets just say this spaghetti loop interleaves 2 quarter rounds with 3 poly multiplications
// Effectively per 512 bytes of stream we hash 480 bytes of ciphertext
polyAdd(0*8(inp)(itr1*1))
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
polyMulStage1_AVX2
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
polyMulStage2_AVX2
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
polyMulStage3_AVX2
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulReduceStage
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
polyAdd(2*8(inp)(itr1*1))
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
polyMulStage1_AVX2
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulStage2_AVX2
VPALIGNR $4, BB0, BB0, BB0; VPALIGNR $4, BB1, BB1, BB1; VPALIGNR $4, BB2, BB2, BB2; VPALIGNR $4, BB3, BB3, BB3
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
VPALIGNR $12, DD0, DD0, DD0; VPALIGNR $12, DD1, DD1, DD1; VPALIGNR $12, DD2, DD2, DD2; VPALIGNR $12, DD3, DD3, DD3
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
polyMulStage3_AVX2
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
VPSHUFB ·rol16<>(SB), DD0, DD0; VPSHUFB ·rol16<>(SB), DD1, DD1; VPSHUFB ·rol16<>(SB), DD2, DD2; VPSHUFB ·rol16<>(SB), DD3, DD3
polyMulReduceStage
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
polyAdd(4*8(inp)(itr1*1))
LEAQ (6*8)(itr1), itr1
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $12, BB0, CC3; VPSRLD $20, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $12, BB1, CC3; VPSRLD $20, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $12, BB2, CC3; VPSRLD $20, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $12, BB3, CC3; VPSRLD $20, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulStage1_AVX2
VPADDD BB0, AA0, AA0; VPADDD BB1, AA1, AA1; VPADDD BB2, AA2, AA2; VPADDD BB3, AA3, AA3
VPXOR AA0, DD0, DD0; VPXOR AA1, DD1, DD1; VPXOR AA2, DD2, DD2; VPXOR AA3, DD3, DD3
polyMulStage2_AVX2
VPSHUFB ·rol8<>(SB), DD0, DD0; VPSHUFB ·rol8<>(SB), DD1, DD1; VPSHUFB ·rol8<>(SB), DD2, DD2; VPSHUFB ·rol8<>(SB), DD3, DD3
VPADDD DD0, CC0, CC0; VPADDD DD1, CC1, CC1; VPADDD DD2, CC2, CC2; VPADDD DD3, CC3, CC3
polyMulStage3_AVX2
VPXOR CC0, BB0, BB0; VPXOR CC1, BB1, BB1; VPXOR CC2, BB2, BB2; VPXOR CC3, BB3, BB3
VMOVDQA CC3, tmpStoreAVX2
VPSLLD $7, BB0, CC3; VPSRLD $25, BB0, BB0; VPXOR CC3, BB0, BB0
VPSLLD $7, BB1, CC3; VPSRLD $25, BB1, BB1; VPXOR CC3, BB1, BB1
VPSLLD $7, BB2, CC3; VPSRLD $25, BB2, BB2; VPXOR CC3, BB2, BB2
VPSLLD $7, BB3, CC3; VPSRLD $25, BB3, BB3; VPXOR CC3, BB3, BB3
VMOVDQA tmpStoreAVX2, CC3
polyMulReduceStage
VPALIGNR $12, BB0, BB0, BB0; VPALIGNR $12, BB1, BB1, BB1; VPALIGNR $12, BB2, BB2, BB2; VPALIGNR $12, BB3, BB3, BB3
VPALIGNR $8, CC0, CC0, CC0; VPALIGNR $8, CC1, CC1, CC1; VPALIGNR $8, CC2, CC2, CC2; VPALIGNR $8, CC3, CC3, CC3
VPALIGNR $4, DD0, DD0, DD0; VPALIGNR $4, DD1, DD1, DD1; VPALIGNR $4, DD2, DD2, DD2; VPALIGNR $4, DD3, DD3, DD3
CMPQ itr1, $480
JNE openAVX2InternalLoop
VPADDD ·chacha20Constants<>(SB), AA0, AA0; VPADDD ·chacha20Constants<>(SB), AA1, AA1; VPADDD ·chacha20Constants<>(SB), AA2, AA2; VPADDD ·chacha20Constants<>(SB), AA3, AA3
VPADDD state1StoreAVX2, BB0, BB0; VPADDD state1StoreAVX2, BB1, BB1; VPADDD state1StoreAVX2, BB2, BB2; VPADDD state1StoreAVX2, BB3, BB3
VPADDD state2StoreAVX2, CC0, CC0; VPADDD state2StoreAVX2, CC1, CC1; VPADDD state2StoreAVX2, CC2, CC2; VPADDD state2StoreAVX2, CC3, CC3
VPADDD ctr0StoreAVX2, DD0, DD0; VPADDD ctr1StoreAVX2, DD1, DD1; VPADDD ctr2StoreAVX2, DD2, DD2; VPADDD ctr3StoreAVX2, DD3, DD3
VMOVDQA CC3, tmpStoreAVX2
// We only hashed 480 of the 512 bytes available - hash the remaining 32 here
polyAdd(480(inp))
polyMulAVX2
VPERM2I128 $0x02, AA0, BB0, CC3; VPERM2I128 $0x13, AA0, BB0, BB0; VPERM2I128 $0x02, CC0, DD0, AA0; VPERM2I128 $0x13, CC0, DD0, CC0
VPXOR (0*32)(inp), CC3, CC3; VPXOR (1*32)(inp), AA0, AA0; VPXOR (2*32)(inp), BB0, BB0; VPXOR (3*32)(inp), CC0, CC0
VMOVDQU CC3, (0*32)(oup); VMOVDQU AA0, (1*32)(oup); VMOVDQU BB0, (2*32)(oup); VMOVDQU CC0, (3*32)(oup)
VPERM2I128 $0x02, AA1, BB1, AA0; VPERM2I128 $0x02, CC1, DD1, BB0; VPERM2I128 $0x13, AA1, BB1, CC0; VPERM2I128 $0x13, CC1, DD1, DD0
VPXOR (4*32)(inp), AA0, AA0; VPXOR (5*32)(inp), BB0, BB0; VPXOR (6*32)(inp), CC0, CC0; VPXOR (7*32)(inp), DD0, DD0
VMOVDQU AA0, (4*32)(oup); VMOVDQU BB0, (5*32)(oup); VMOVDQU CC0, (6*32)(oup); VMOVDQU DD0, (7*32)(oup)
// and here
polyAdd(496(inp))
polyMulAVX2
VPERM2I128 $0x02, AA2, BB2, AA0; VPERM2I128 $0x02, CC2, DD2, BB0; VPERM2I128 $0x13, AA2, BB2, CC0; VPERM2I128 $0x13, CC2, DD2, DD0
VPXOR (8*32)(inp), AA0, AA0; VPXOR (9*32)(inp), BB0, BB0; VPXOR (10*32)(inp), CC0, CC0; VPXOR (11*32)(inp), DD0, DD0
VMOVDQU AA0, (8*32)(oup); VMOVDQU BB0, (9*32)(oup); VMOVDQU CC0, (10*32)(oup); VMOVDQU DD0, (11*32)(oup)
VPERM2I128 $0x02, AA3, BB3, AA0; VPERM2I128 $0x02, tmpStoreAVX2, DD3, BB0; VPERM2I128 $0x13, AA3, BB3, CC0; VPERM2I128 $0x13, tmpStoreAVX2, DD3, DD0
VPXOR (12*32)(inp), AA0, AA0; VPXOR (13*32)(inp), BB0, BB0; VPXOR (14*32)(inp), CC0, CC0; VPXOR (15*32)(inp), DD0, DD0
VMOVDQU AA0, (12*32)(oup); VMOVDQU BB0, (13*32)(oup); VMOVDQU CC0, (14*32)(oup); VMOVDQU DD0, (15*32)(oup)
LEAQ (32*16)(inp), inp
LEAQ (32*16)(oup), oup
SUBQ $(32*16), inl
JMP openAVX2MainLoop
openAVX2MainLoopDone:
// Handle the various tail sizes efficiently
TESTQ inl, inl
JE openSSEFinalize
CMPQ inl, $128
JBE openAVX2Tail128
CMPQ inl, $256
JBE openAVX2Tail256
CMPQ inl, $384
JBE openAVX2Tail384
JMP openAVX2Tail512
// ----------------------------------------------------------------------------
// Special optimization for buffers smaller than 193 bytes
openAVX2192:
// For up to 192 bytes of ciphertext and 64 bytes for the poly key, we process four blocks
VMOVDQA AA0, AA1
VMOVDQA BB0, BB1
VMOVDQA CC0, CC1
VPADDD ·avx2IncMask<>(SB), DD0, DD1
VMOVDQA AA0, AA2
VMOVDQA BB0, BB2
VMOVDQA CC0, CC2