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
|
/*
* linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES
*
* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* included by aes-ce.S and aes-neon.S */
.text
.align 4
/*
* There are several ways to instantiate this code:
* - no interleave, all inline
* - 2-way interleave, 2x calls out of line (-DINTERLEAVE=2)
* - 2-way interleave, all inline (-DINTERLEAVE=2 -DINTERLEAVE_INLINE)
* - 4-way interleave, 4x calls out of line (-DINTERLEAVE=4)
* - 4-way interleave, all inline (-DINTERLEAVE=4 -DINTERLEAVE_INLINE)
*
* Macros imported by this code:
* - enc_prepare - setup NEON registers for encryption
* - dec_prepare - setup NEON registers for decryption
* - enc_switch_key - change to new key after having prepared for encryption
* - encrypt_block - encrypt a single block
* - decrypt block - decrypt a single block
* - encrypt_block2x - encrypt 2 blocks in parallel (if INTERLEAVE == 2)
* - decrypt_block2x - decrypt 2 blocks in parallel (if INTERLEAVE == 2)
* - encrypt_block4x - encrypt 4 blocks in parallel (if INTERLEAVE == 4)
* - decrypt_block4x - decrypt 4 blocks in parallel (if INTERLEAVE == 4)
*/
#if defined(INTERLEAVE) && !defined(INTERLEAVE_INLINE)
#define FRAME_PUSH stp x29, x30, [sp,#-16]! ; mov x29, sp
#define FRAME_POP ldp x29, x30, [sp],#16
#if INTERLEAVE == 2
aes_encrypt_block2x:
encrypt_block2x v0, v1, w3, x2, x6, w7
ret
ENDPROC(aes_encrypt_block2x)
aes_decrypt_block2x:
decrypt_block2x v0, v1, w3, x2, x6, w7
ret
ENDPROC(aes_decrypt_block2x)
#elif INTERLEAVE == 4
aes_encrypt_block4x:
encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
ret
ENDPROC(aes_encrypt_block4x)
aes_decrypt_block4x:
decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
ret
ENDPROC(aes_decrypt_block4x)
#else
#error INTERLEAVE should equal 2 or 4
#endif
.macro do_encrypt_block2x
bl aes_encrypt_block2x
.endm
.macro do_decrypt_block2x
bl aes_decrypt_block2x
.endm
.macro do_encrypt_block4x
bl aes_encrypt_block4x
.endm
.macro do_decrypt_block4x
bl aes_decrypt_block4x
.endm
#else
#define FRAME_PUSH
#define FRAME_POP
.macro do_encrypt_block2x
encrypt_block2x v0, v1, w3, x2, x6, w7
.endm
.macro do_decrypt_block2x
decrypt_block2x v0, v1, w3, x2, x6, w7
.endm
.macro do_encrypt_block4x
encrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
.endm
.macro do_decrypt_block4x
decrypt_block4x v0, v1, v2, v3, w3, x2, x6, w7
.endm
#endif
/*
* aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, int first)
* aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, int first)
*/
AES_ENTRY(aes_ecb_encrypt)
FRAME_PUSH
cbz w5, .LecbencloopNx
enc_prepare w3, x2, x5
.LecbencloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lecbenc1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
do_encrypt_block2x
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
do_encrypt_block4x
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LecbencloopNx
.Lecbenc1x:
adds w4, w4, #INTERLEAVE
beq .Lecbencout
#endif
.Lecbencloop:
ld1 {v0.16b}, [x1], #16 /* get next pt block */
encrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbencloop
.Lecbencout:
FRAME_POP
ret
AES_ENDPROC(aes_ecb_encrypt)
AES_ENTRY(aes_ecb_decrypt)
FRAME_PUSH
cbz w5, .LecbdecloopNx
dec_prepare w3, x2, x5
.LecbdecloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lecbdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
do_decrypt_block2x
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
do_decrypt_block4x
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LecbdecloopNx
.Lecbdec1x:
adds w4, w4, #INTERLEAVE
beq .Lecbdecout
#endif
.Lecbdecloop:
ld1 {v0.16b}, [x1], #16 /* get next ct block */
decrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lecbdecloop
.Lecbdecout:
FRAME_POP
ret
AES_ENDPROC(aes_ecb_decrypt)
/*
* aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[], int first)
* aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 iv[], int first)
*/
AES_ENTRY(aes_cbc_encrypt)
cbz w6, .Lcbcencloop
ld1 {v0.16b}, [x5] /* get iv */
enc_prepare w3, x2, x5
.Lcbcencloop:
ld1 {v1.16b}, [x1], #16 /* get next pt block */
eor v0.16b, v0.16b, v1.16b /* ..and xor with iv */
encrypt_block v0, w3, x2, x5, w6
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcencloop
ret
AES_ENDPROC(aes_cbc_encrypt)
AES_ENTRY(aes_cbc_decrypt)
FRAME_PUSH
cbz w6, .LcbcdecloopNx
ld1 {v7.16b}, [x5] /* get iv */
dec_prepare w3, x2, x5
.LcbcdecloopNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lcbcdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
mov v2.16b, v0.16b
mov v3.16b, v1.16b
do_decrypt_block2x
eor v0.16b, v0.16b, v7.16b
eor v1.16b, v1.16b, v2.16b
mov v7.16b, v3.16b
st1 {v0.16b-v1.16b}, [x0], #32
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
mov v4.16b, v0.16b
mov v5.16b, v1.16b
mov v6.16b, v2.16b
do_decrypt_block4x
sub x1, x1, #16
eor v0.16b, v0.16b, v7.16b
eor v1.16b, v1.16b, v4.16b
ld1 {v7.16b}, [x1], #16 /* reload 1 ct block */
eor v2.16b, v2.16b, v5.16b
eor v3.16b, v3.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
#endif
b .LcbcdecloopNx
.Lcbcdec1x:
adds w4, w4, #INTERLEAVE
beq .Lcbcdecout
#endif
.Lcbcdecloop:
ld1 {v1.16b}, [x1], #16 /* get next ct block */
mov v0.16b, v1.16b /* ...and copy to v0 */
decrypt_block v0, w3, x2, x5, w6
eor v0.16b, v0.16b, v7.16b /* xor with iv => pt */
mov v7.16b, v1.16b /* ct is next iv */
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
bne .Lcbcdecloop
.Lcbcdecout:
FRAME_POP
ret
AES_ENDPROC(aes_cbc_decrypt)
/*
* aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds,
* int blocks, u8 ctr[], int first)
*/
AES_ENTRY(aes_ctr_encrypt)
FRAME_PUSH
cbnz w6, .Lctrfirst /* 1st time around? */
umov x5, v4.d[1] /* keep swabbed ctr in reg */
rev x5, x5
#if INTERLEAVE >= 2
cmn w5, w4 /* 32 bit overflow? */
bcs .Lctrinc
add x5, x5, #1 /* increment BE ctr */
b .LctrincNx
#else
b .Lctrinc
#endif
.Lctrfirst:
enc_prepare w3, x2, x6
ld1 {v4.16b}, [x5]
umov x5, v4.d[1] /* keep swabbed ctr in reg */
rev x5, x5
#if INTERLEAVE >= 2
cmn w5, w4 /* 32 bit overflow? */
bcs .Lctrloop
.LctrloopNx:
subs w4, w4, #INTERLEAVE
bmi .Lctr1x
#if INTERLEAVE == 2
mov v0.8b, v4.8b
mov v1.8b, v4.8b
rev x7, x5
add x5, x5, #1
ins v0.d[1], x7
rev x7, x5
add x5, x5, #1
ins v1.d[1], x7
ld1 {v2.16b-v3.16b}, [x1], #32 /* get 2 input blocks */
do_encrypt_block2x
eor v0.16b, v0.16b, v2.16b
eor v1.16b, v1.16b, v3.16b
st1 {v0.16b-v1.16b}, [x0], #32
#else
ldr q8, =0x30000000200000001 /* addends 1,2,3[,0] */
dup v7.4s, w5
mov v0.16b, v4.16b
add v7.4s, v7.4s, v8.4s
mov v1.16b, v4.16b
rev32 v8.16b, v7.16b
mov v2.16b, v4.16b
mov v3.16b, v4.16b
mov v1.s[3], v8.s[0]
mov v2.s[3], v8.s[1]
mov v3.s[3], v8.s[2]
ld1 {v5.16b-v7.16b}, [x1], #48 /* get 3 input blocks */
do_encrypt_block4x
eor v0.16b, v5.16b, v0.16b
ld1 {v5.16b}, [x1], #16 /* get 1 input block */
eor v1.16b, v6.16b, v1.16b
eor v2.16b, v7.16b, v2.16b
eor v3.16b, v5.16b, v3.16b
st1 {v0.16b-v3.16b}, [x0], #64
add x5, x5, #INTERLEAVE
#endif
cbz w4, .LctroutNx
.LctrincNx:
rev x7, x5
ins v4.d[1], x7
b .LctrloopNx
.LctroutNx:
sub x5, x5, #1
rev x7, x5
ins v4.d[1], x7
b .Lctrout
.Lctr1x:
adds w4, w4, #INTERLEAVE
beq .Lctrout
#endif
.Lctrloop:
mov v0.16b, v4.16b
encrypt_block v0, w3, x2, x6, w7
subs w4, w4, #1
bmi .Lctrhalfblock /* blocks < 0 means 1/2 block */
ld1 {v3.16b}, [x1], #16
eor v3.16b, v0.16b, v3.16b
st1 {v3.16b}, [x0], #16
beq .Lctrout
.Lctrinc:
adds x5, x5, #1 /* increment BE ctr */
rev x7, x5
ins v4.d[1], x7
bcc .Lctrloop /* no overflow? */
umov x7, v4.d[0] /* load upper word of ctr */
rev x7, x7 /* ... to handle the carry */
add x7, x7, #1
rev x7, x7
ins v4.d[0], x7
b .Lctrloop
.Lctrhalfblock:
ld1 {v3.8b}, [x1]
eor v3.8b, v0.8b, v3.8b
st1 {v3.8b}, [x0]
.Lctrout:
FRAME_POP
ret
AES_ENDPROC(aes_ctr_encrypt)
.ltorg
/*
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 const rk2[], u8 iv[], int first)
* aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds,
* int blocks, u8 const rk2[], u8 iv[], int first)
*/
.macro next_tweak, out, in, const, tmp
sshr \tmp\().2d, \in\().2d, #63
and \tmp\().16b, \tmp\().16b, \const\().16b
add \out\().2d, \in\().2d, \in\().2d
ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8
eor \out\().16b, \out\().16b, \tmp\().16b
.endm
.Lxts_mul_x:
CPU_LE( .quad 1, 0x87 )
CPU_BE( .quad 0x87, 1 )
AES_ENTRY(aes_xts_encrypt)
FRAME_PUSH
cbz w7, .LxtsencloopNx
ld1 {v4.16b}, [x6]
enc_prepare w3, x5, x6
encrypt_block v4, w3, x5, x6, w7 /* first tweak */
enc_switch_key w3, x2, x6
ldr q7, .Lxts_mul_x
b .LxtsencNx
.LxtsencloopNx:
ldr q7, .Lxts_mul_x
next_tweak v4, v4, v7, v8
.LxtsencNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lxtsenc1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 pt blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
do_encrypt_block2x
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
st1 {v0.16b-v1.16b}, [x0], #32
cbz w4, .LxtsencoutNx
next_tweak v4, v5, v7, v8
b .LxtsencNx
.LxtsencoutNx:
mov v4.16b, v5.16b
b .Lxtsencout
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v7, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v7, v8
eor v3.16b, v3.16b, v7.16b
do_encrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsencout
b .LxtsencloopNx
#endif
.Lxtsenc1x:
adds w4, w4, #INTERLEAVE
beq .Lxtsencout
#endif
.Lxtsencloop:
ld1 {v1.16b}, [x1], #16
eor v0.16b, v1.16b, v4.16b
encrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
beq .Lxtsencout
next_tweak v4, v4, v7, v8
b .Lxtsencloop
.Lxtsencout:
FRAME_POP
ret
AES_ENDPROC(aes_xts_encrypt)
AES_ENTRY(aes_xts_decrypt)
FRAME_PUSH
cbz w7, .LxtsdecloopNx
ld1 {v4.16b}, [x6]
enc_prepare w3, x5, x6
encrypt_block v4, w3, x5, x6, w7 /* first tweak */
dec_prepare w3, x2, x6
ldr q7, .Lxts_mul_x
b .LxtsdecNx
.LxtsdecloopNx:
ldr q7, .Lxts_mul_x
next_tweak v4, v4, v7, v8
.LxtsdecNx:
#if INTERLEAVE >= 2
subs w4, w4, #INTERLEAVE
bmi .Lxtsdec1x
#if INTERLEAVE == 2
ld1 {v0.16b-v1.16b}, [x1], #32 /* get 2 ct blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
do_decrypt_block2x
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
st1 {v0.16b-v1.16b}, [x0], #32
cbz w4, .LxtsdecoutNx
next_tweak v4, v5, v7, v8
b .LxtsdecNx
.LxtsdecoutNx:
mov v4.16b, v5.16b
b .Lxtsdecout
#else
ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */
next_tweak v5, v4, v7, v8
eor v0.16b, v0.16b, v4.16b
next_tweak v6, v5, v7, v8
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
next_tweak v7, v6, v7, v8
eor v3.16b, v3.16b, v7.16b
do_decrypt_block4x
eor v3.16b, v3.16b, v7.16b
eor v0.16b, v0.16b, v4.16b
eor v1.16b, v1.16b, v5.16b
eor v2.16b, v2.16b, v6.16b
st1 {v0.16b-v3.16b}, [x0], #64
mov v4.16b, v7.16b
cbz w4, .Lxtsdecout
b .LxtsdecloopNx
#endif
.Lxtsdec1x:
adds w4, w4, #INTERLEAVE
beq .Lxtsdecout
#endif
.Lxtsdecloop:
ld1 {v1.16b}, [x1], #16
eor v0.16b, v1.16b, v4.16b
decrypt_block v0, w3, x2, x6, w7
eor v0.16b, v0.16b, v4.16b
st1 {v0.16b}, [x0], #16
subs w4, w4, #1
beq .Lxtsdecout
next_tweak v4, v4, v7, v8
b .Lxtsdecloop
.Lxtsdecout:
FRAME_POP
ret
AES_ENDPROC(aes_xts_decrypt)
|
