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
|
/**********************************************************************
Copyright(c) 2021 Arm Corporation All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of Arm Corporation nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**********************************************************************/
.arch armv8-a+crypto
.text
#include "cbc_common.S"
.altmacro
.macro _aes_decrypt_round block:req,key:req
aesd v\block\().16b,vKey\key\().16b
.if \key < 13
aesimc v\block\().16b,v\block\().16b
.endif
.if \key > 13
.error "erro her"
.endif
.endm
.macro aes_decrypt_round block,reg,key
_aes_decrypt_round In\reg\()_\block,\key
.endm
.macro load_keys first_key
.if \first_key == 4
ld1 {vKey4.4s -vKey6.4s},[keys],3*16
.endif
.ifc 2 , \first_key
ldr qKey2,[keys],1*16
ld1 {vKey3.16b -vKey6.16b},[keys],4*16
.endif
.ifc 0 , \first_key
ld1 {vKey0.16b -vKey2.16b},[keys],3*16
ld1 {vKey3.16b -vKey6.16b},[keys],4*16
.endif
ld1 {vKey7.16b -vKey10.16b},[keys],4*16
ld1 {vKey11.16b-vKey14.16b},[keys],4*16
.endm
.macro aes_decrypt_blocks_round blocks,key_idx,key_reg,next_keyreg,first_idx
.if \key_idx == 12
ldr q\next_keyreg,[keys],(\first_idx-13)*16
.else
ldr q\next_keyreg,[keys],16
.endif
n=0
.rept \blocks
_aes_decrypt_round %n,\key_reg
n=n+1
.endr
.endm
.macro aes_decrypt_rounds blocks,key_st,key_end,first_idx
j=key_st
.rept \key_end - \key_st + 1
aes_decrypt_blocks_round \blocks,%j,%(j%2),%((j+1)%2),\first_idx
j=j+1
.endr
.endm
.macro aes_cbc_decrypt_rounds blocks,first_idx,reg,next_reg
aes_decrypt_rounds \blocks,\first_idx,12,\first_idx
.endm
.macro declare_prefix idx,reg,prefix
declare_var_vector_reg \prefix\()\idx,\reg
.endm
.macro mldr reg,block,addr
ldr qIn\reg\()_\block,[\addr],16
.endm
.macro mldrin reg,blocks,addr
.if \blocks == 1
ldr qIn\reg\()_0,[\addr],16
.exitm
.endif
.if \blocks == 2
ldp qIn\reg\()_0,qIn\reg\()_1,[\addr],2*16
.exitm
.endif
.if \blocks == 3
ldr qIn\reg\()_0,[\addr],16
ldp qIn\reg\()_1,qIn\reg\()_2,[\addr],2*16
.exitm
.endif
.if \blocks == 4
ld1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 5
ldr qIn\reg\()_0,[\addr],16
ld1 {vIn\reg\()_1.16b-vIn\reg\()_4.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 6
ldp qIn\reg\()_0,qIn\reg\()_1,[\addr],2*16
ld1 {vIn\reg\()_2.16b-vIn\reg\()_5.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 7
ld1 {vIn\reg\()_0.16b-vIn\reg\()_2.16b},[\addr],3*16
ld1 {vIn\reg\()_3.16b-vIn\reg\()_6.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 8
ld1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
ld1 {vIn\reg\()_4.16b-vIn\reg\()_7.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 9
ld1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
ld1 {vIn\reg\()_4.16b-vIn\reg\()_7.16b},[\addr],4*16
ldr qIn\reg\()_8,[\addr],16
.exitm
.endif
.endm
.macro mstrout reg,blocks,addr
.if \blocks == 1
str qIn\reg\()_0,[\addr],16
.exitm
.endif
.if \blocks == 2
stp qIn\reg\()_0,qIn\reg\()_1,[\addr],2*16
.exitm
.endif
.if \blocks == 3
str qIn\reg\()_0,[\addr],16
stp qIn\reg\()_1,qIn\reg\()_2,[\addr],2*16
.exitm
.endif
.if \blocks == 4
st1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 5
str qIn\reg\()_0,[\addr],16
st1 {vIn\reg\()_1.16b-vIn\reg\()_4.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 6
stp qIn\reg\()_0,qIn\reg\()_1,[\addr],2*16
st1 {vIn\reg\()_2.16b-vIn\reg\()_5.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 7
st1 {vIn\reg\()_0.16b-vIn\reg\()_2.16b},[\addr],3*16
st1 {vIn\reg\()_3.16b-vIn\reg\()_6.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 8
st1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
st1 {vIn\reg\()_4.16b-vIn\reg\()_7.16b},[\addr],4*16
.exitm
.endif
.if \blocks == 9
st1 {vIn\reg\()_0.16b-vIn\reg\()_3.16b},[\addr],4*16
st1 {vIn\reg\()_4.16b-vIn\reg\()_7.16b},[\addr],4*16
str qIn\reg\()_8,[\addr],16
.exitm
.endif
.endm
.macro eorkey14 block,reg
eor vBlock\block\().16b,vKey14.16b,vState\reg\()_\block\().16b
.endm
.macro eorblock block,reg
eor vIn\reg\()_\block\().16b,vBlock\block\().16b,vIn\reg\()_\block\().16b
.endm
.macro movstate0 block,reg
mov vState\reg\()_0.16b,vIn\reg\()_\block\().16b
.endm
.macro cbc_decrypt_rounds blocks,reg,first_key,cur_blocks
.ifb \cur_blocks
_blocks=\blocks
.else
_blocks=\cur_blocks
.endif
key=\first_key + 1
.if 3*\blocks+1 >= 32-15+\first_key
ldr_key %key,\first_key
.endif
n=0
.rept _blocks - 1
eorkey14 %((n+1)%_blocks),\reg
aes_decrypt_round %n,\reg,\first_key
n=n+1
.endr
eorkey14 0,\reg
movstate0 %(_blocks-1),\reg
aes_decrypt_round %n,\reg,\first_key
k=0
.rept 15-\first_key-3
n=0
.if 3*\blocks+1 >= 32-15+\first_key
ldr_key %(key+k+1),\first_key
.endif
.rept _blocks
aes_decrypt_round %n,\reg,%(key+k)
n=n+1
.endr
k=k+1
.endr
n=0
.if 3*\blocks+1 >= 32-15+\first_key
ldr_key \first_key,\first_key
.endif
.rept _blocks
aes_decrypt_round %n,\reg,13
eorblock %n,\reg
n=n+1
.endr
.endm
.macro print_macro a,b,c,d,e
.print "print_macro,\a \b \c \d \e"
.endm
.macro remainder_process blocks,first_key,curblk
.if \blocks > (1<<\curblk)
tbz xlen_remainder,\curblk,1f
mldrin 0,%(1<<\curblk),in
cbc_decrypt_rounds \blocks,0,\first_key,%(1<<\curblk)
mstrout 0,%(1<<\curblk),out
1:
.endif
.endm
.macro aes_cbc_decrypt_blocks first_key,blocks
division \blocks, len_bytes,len_remainder,tmp0,tmp1
mov xlen_quotient_in,xlen_quotient
/*
input regs(2*\block) + tmp regs(\blocks) + State reg(1)
+ key regs(15-\first_key) < 32
*/
.if 3*\blocks+1 < 32-15+\first_key
n=\first_key
.rept 15-\first_key
declare_prefix %n,%(n+17),Key
n=n+1
.endr
load_keys \first_key
.else
n=\first_key
.rept 14-\first_key
declare_prefix %n,%((n%2)+29),Key
n=n+1
.endr
declare_prefix 14,31,Key
/* load first key */
ldr_key \first_key,\first_key
/* load last key */
ldr_key 14,\first_key
.endif
m=\blocks
l=\blocks-1
declare_prefix 0,0,State0_
declare_prefix 0,0,State1_
n=0
.rept \blocks
declare_prefix %n,%(n+1),In0_
declare_prefix %n,%(n+m+1),In1_
declare_prefix %n,%(n+2*m+1),Block
n=n+1
.endr
n=1
.rept \blocks -1
declare_prefix %n,%(n),State0_
declare_prefix %n,%(n+m),State1_
n=n+1
.endr
ldr qState0_0,[IV]
cbz xlen_quotient,9f
mldrin 0,\blocks,in
sub xlen_quotient_in,xlen_quotient_in,1
b 5f
3:
sub xlen_quotient,xlen_quotient,1
mstrout 1,\blocks,out
cbz xlen_quotient,9f
5:
cbz xlen_quotient_in,1f
mldrin 1,\blocks,in
sub xlen_quotient_in,xlen_quotient_in,1
1:
cbc_decrypt_rounds \blocks,0,\first_key
sub xlen_quotient,xlen_quotient,1
mstrout 0,\blocks,out
cbz xlen_quotient,9f
cbz xlen_quotient_in,1f
mldrin 0,\blocks,in
sub xlen_quotient_in,xlen_quotient_in,1
1:
cbc_decrypt_rounds \blocks,1,\first_key
b 3b
9:
remainder_process \blocks,\first_key,3
remainder_process \blocks,\first_key,2
remainder_process \blocks,\first_key,1
remainder_process \blocks,\first_key,0
.endm
.macro division blocks,quotient,remainder,tmp0,tmp1
.if \blocks == 1
mov x\remainder, 0
.exitm
.endif
.if \blocks == 2
and x\remainder, x\quotient, 1
lsr x\quotient, x\quotient, 1
.exitm
.endif
.if \blocks == 3
mov x\tmp0, -6148914691236517206
mov x\remainder, x\quotient
movk x\tmp0, 0xaaab, lsl 0
umulh x\tmp0, x\quotient, x\tmp0
and x\tmp1, x\tmp0, -2
lsr x\quotient, x\tmp0, 1
add x\tmp1, x\tmp1, x\quotient
sub x\remainder, x\remainder, x\tmp1
.exitm
.endif
.if \blocks == 4
and x\remainder, x\quotient, 3
lsr x\quotient, x\quotient, 2
.exitm
.endif
.if \blocks == 5
mov x\tmp0, -3689348814741910324
mov x\remainder, x\quotient
movk x\tmp0, 0xcccd, lsl 0
umulh x\tmp0, x\quotient, x\tmp0
and x\tmp1, x\tmp0, -4
lsr x\quotient, x\tmp0, 2
add x\tmp1, x\tmp1, x\quotient
sub x\remainder, x\remainder, x\tmp1
.exitm
.endif
.if \blocks == 6
mov x\tmp0, -6148914691236517206
mov x\tmp1, x\quotient
movk x\tmp0, 0xaaab, lsl 0
umulh x\tmp0, x\quotient, x\tmp0
lsr x\quotient, x\tmp0, 2
add x\remainder, x\quotient, x\quotient, lsl 1
sub x\remainder, x\tmp1, x\remainder, lsl 1
.exitm
.endif
.if \blocks == 7
mov x\tmp0, 9363
mov x\tmp1, x\quotient
movk x\tmp0, 0x9249, lsl 16
movk x\tmp0, 0x4924, lsl 32
movk x\tmp0, 0x2492, lsl 48
umulh x\quotient, x\quotient, x\tmp0
sub x\tmp0, x\tmp1, x\quotient
add x\tmp0, x\quotient, x\tmp0, lsr 1
lsr x\quotient, x\tmp0, 2
lsl x\remainder, x\quotient, 3
sub x\remainder, x\remainder, x\quotient
sub x\remainder, x\tmp1, x\remainder
.exitm
.endif
.if \blocks == 8
and x\remainder, x\quotient, 7
lsr x\quotient, x\quotient, 3
.exitm
.endif
.if \blocks == 9
mov x\tmp0, 58255
mov x\remainder, x\quotient
movk x\tmp0, 0x8e38, lsl 16
movk x\tmp0, 0x38e3, lsl 32
movk x\tmp0, 0xe38e, lsl 48
umulh x\tmp0, x\quotient, x\tmp0
and x\tmp1, x\tmp0, -8
lsr x\quotient, x\tmp0, 3
add x\tmp1, x\tmp1, x\quotient
sub x\remainder, x\remainder, x\tmp1
.exitm
.endif
.endm
.macro ldr_key num,first_key
ldr qKey\num,[keys,16*(\num - \first_key)]
.endm
#ifndef CBC_DECRYPT_BLOCKS_NUM
#define CBC_DECRYPT_BLOCKS_NUM 8
#endif
.macro cbc_decrypt first_key:req,blocks
lsr xlen_bytes,xlen_bytes,4
cbz xlen_bytes,10f
push_stack
aes_cbc_decrypt_blocks \first_key,\blocks
pop_stack
10:
.endm
.set stack_size,64
.macro push_stack
stp d8, d9,[sp,-stack_size]!
stp d10,d11,[sp,16]
stp d12,d13,[sp,32]
stp d14,d15,[sp,48]
.endm
.macro pop_stack
ldp d10,d11,[sp,16]
ldp d12,d13,[sp,32]
ldp d14,d15,[sp,48]
ldp d8, d9, [sp], stack_size
.endm
/*
void aes_cbc_dec_128(
void *in, //!< Input cipher text
uint8_t *IV, //!< Must be 16 bytes aligned to a 16 byte boundary
uint8_t *keys, //!< Must be on a 16 byte boundary and length of key size * key rounds or dec_keys of cbc_key_data
void *out, //!< Output plain text
uint64_t len_bytes //!< Must be a multiple of 16 bytes
);
*/
declare_var_generic_reg in ,0
declare_var_generic_reg IV ,1
declare_var_generic_reg keys ,2
declare_var_generic_reg out ,3
declare_var_generic_reg len_bytes ,4
declare_var_generic_reg len_quotient,4
declare_var_generic_reg len_remainder,5
declare_var_generic_reg tmp0 ,6
declare_var_generic_reg tmp1 ,7
declare_var_generic_reg len_quotient_in,6
.macro define_aes_cbc_dec_func mode:req,blocks:req
.global aes_cbc_dec_\mode\()_aes_\blocks
aes_cbc_dec_\mode\()_aes_\blocks:
cbc_decrypt %((256-mode)/32),\blocks
ret
.size aes_cbc_dec_\mode\()_aes_\blocks, . - aes_cbc_dec_\mode\()_aes_\blocks
.endm
.irp blocks,1,2,3,4,5,6,7,8,9
define_aes_cbc_dec_func 128,\blocks
define_aes_cbc_dec_func 192,\blocks
define_aes_cbc_dec_func 256,\blocks
.endr
|