summaryrefslogtreecommitdiff
path: root/arch/arm64/crypto/aes-glue.c
blob: 2fa850e86aa808d1f8ce3f2b25e91f59a14e49ee (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
/*
 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
 *
 * Copyright (C) 2013 - 2017 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.
 */

#include <asm/neon.h>
#include <asm/hwcap.h>
#include <asm/simd.h>
#include <crypto/aes.h>
#include <crypto/internal/hash.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <crypto/xts.h>

#include "aes-ce-setkey.h"
#include "aes-ctr-fallback.h"

#ifdef USE_V8_CRYPTO_EXTENSIONS
#define MODE			"ce"
#define PRIO			300
#define aes_setkey		ce_aes_setkey
#define aes_expandkey		ce_aes_expandkey
#define aes_ecb_encrypt		ce_aes_ecb_encrypt
#define aes_ecb_decrypt		ce_aes_ecb_decrypt
#define aes_cbc_encrypt		ce_aes_cbc_encrypt
#define aes_cbc_decrypt		ce_aes_cbc_decrypt
#define aes_ctr_encrypt		ce_aes_ctr_encrypt
#define aes_xts_encrypt		ce_aes_xts_encrypt
#define aes_xts_decrypt		ce_aes_xts_decrypt
#define aes_mac_update		ce_aes_mac_update
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
#else
#define MODE			"neon"
#define PRIO			200
#define aes_setkey		crypto_aes_set_key
#define aes_expandkey		crypto_aes_expand_key
#define aes_ecb_encrypt		neon_aes_ecb_encrypt
#define aes_ecb_decrypt		neon_aes_ecb_decrypt
#define aes_cbc_encrypt		neon_aes_cbc_encrypt
#define aes_cbc_decrypt		neon_aes_cbc_decrypt
#define aes_ctr_encrypt		neon_aes_ctr_encrypt
#define aes_xts_encrypt		neon_aes_xts_encrypt
#define aes_xts_decrypt		neon_aes_xts_decrypt
#define aes_mac_update		neon_aes_mac_update
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
MODULE_ALIAS_CRYPTO("ecb(aes)");
MODULE_ALIAS_CRYPTO("cbc(aes)");
MODULE_ALIAS_CRYPTO("ctr(aes)");
MODULE_ALIAS_CRYPTO("xts(aes)");
MODULE_ALIAS_CRYPTO("cmac(aes)");
MODULE_ALIAS_CRYPTO("xcbc(aes)");
MODULE_ALIAS_CRYPTO("cbcmac(aes)");
#endif

MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

/* defined in aes-modes.S */
asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, int first);
asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, int first);

asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 iv[], int first);
asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 iv[], int first);

asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 ctr[], int first);

asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
				int rounds, int blocks, u8 const rk2[], u8 iv[],
				int first);
asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
				int rounds, int blocks, u8 const rk2[], u8 iv[],
				int first);

asmlinkage void aes_mac_update(u8 const in[], u32 const rk[], int rounds,
			       int blocks, u8 dg[], int enc_before,
			       int enc_after);

struct crypto_aes_xts_ctx {
	struct crypto_aes_ctx key1;
	struct crypto_aes_ctx __aligned(8) key2;
};

struct mac_tfm_ctx {
	struct crypto_aes_ctx key;
	u8 __aligned(8) consts[];
};

struct mac_desc_ctx {
	unsigned int len;
	u8 dg[AES_BLOCK_SIZE];
};

static int skcipher_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
			       unsigned int key_len)
{
	return aes_setkey(crypto_skcipher_tfm(tfm), in_key, key_len);
}

static int xts_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
		       unsigned int key_len)
{
	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int ret;

	ret = xts_verify_key(tfm, in_key, key_len);
	if (ret)
		return ret;

	ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
	if (!ret)
		ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2],
				    key_len / 2);
	if (!ret)
		return 0;

	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
}

static int ecb_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int ecb_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_dec, rounds, blocks, first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int cbc_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
				first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int cbc_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_dec, rounds, blocks, walk.iv,
				first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int ctr_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	first = 1;
	kernel_neon_begin();
	while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
		aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
				first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
		first = 0;
	}
	if (walk.nbytes) {
		u8 __aligned(8) tail[AES_BLOCK_SIZE];
		unsigned int nbytes = walk.nbytes;
		u8 *tdst = walk.dst.virt.addr;
		u8 *tsrc = walk.src.virt.addr;

		/*
		 * Tell aes_ctr_encrypt() to process a tail block.
		 */
		blocks = -1;

		aes_ctr_encrypt(tail, NULL, (u8 *)ctx->key_enc, rounds,
				blocks, walk.iv, first);
		crypto_xor_cpy(tdst, tsrc, tail, nbytes);
		err = skcipher_walk_done(&walk, 0);
	}
	kernel_neon_end();

	return err;
}

static int ctr_encrypt_sync(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);

	if (!may_use_simd())
		return aes_ctr_encrypt_fallback(ctx, req);

	return ctr_encrypt(req);
}

static int xts_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key1.key_enc, rounds, blocks,
				(u8 *)ctx->key2.key_enc, walk.iv, first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
}

static int xts_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key1.key_dec, rounds, blocks,
				(u8 *)ctx->key2.key_enc, walk.iv, first);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
}

static struct skcipher_alg aes_algs[] = { {
	.base = {
		.cra_name		= "__ecb(aes)",
		.cra_driver_name	= "__ecb-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_flags		= CRYPTO_ALG_INTERNAL,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.setkey		= skcipher_aes_setkey,
	.encrypt	= ecb_encrypt,
	.decrypt	= ecb_decrypt,
}, {
	.base = {
		.cra_name		= "__cbc(aes)",
		.cra_driver_name	= "__cbc-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_flags		= CRYPTO_ALG_INTERNAL,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.setkey		= skcipher_aes_setkey,
	.encrypt	= cbc_encrypt,
	.decrypt	= cbc_decrypt,
}, {
	.base = {
		.cra_name		= "__ctr(aes)",
		.cra_driver_name	= "__ctr-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_flags		= CRYPTO_ALG_INTERNAL,
		.cra_blocksize		= 1,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.chunksize	= AES_BLOCK_SIZE,
	.setkey		= skcipher_aes_setkey,
	.encrypt	= ctr_encrypt,
	.decrypt	= ctr_encrypt,
}, {
	.base = {
		.cra_name		= "ctr(aes)",
		.cra_driver_name	= "ctr-aes-" MODE,
		.cra_priority		= PRIO - 1,
		.cra_blocksize		= 1,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.chunksize	= AES_BLOCK_SIZE,
	.setkey		= skcipher_aes_setkey,
	.encrypt	= ctr_encrypt_sync,
	.decrypt	= ctr_encrypt_sync,
}, {
	.base = {
		.cra_name		= "__xts(aes)",
		.cra_driver_name	= "__xts-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_flags		= CRYPTO_ALG_INTERNAL,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_xts_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= 2 * AES_MIN_KEY_SIZE,
	.max_keysize	= 2 * AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.setkey		= xts_set_key,
	.encrypt	= xts_encrypt,
	.decrypt	= xts_decrypt,
} };

static int cbcmac_setkey(struct crypto_shash *tfm, const u8 *in_key,
			 unsigned int key_len)
{
	struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
	int err;

	err = aes_expandkey(&ctx->key, in_key, key_len);
	if (err)
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);

	return err;
}

static void cmac_gf128_mul_by_x(be128 *y, const be128 *x)
{
	u64 a = be64_to_cpu(x->a);
	u64 b = be64_to_cpu(x->b);

	y->a = cpu_to_be64((a << 1) | (b >> 63));
	y->b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0));
}

static int cmac_setkey(struct crypto_shash *tfm, const u8 *in_key,
		       unsigned int key_len)
{
	struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
	be128 *consts = (be128 *)ctx->consts;
	u8 *rk = (u8 *)ctx->key.key_enc;
	int rounds = 6 + key_len / 4;
	int err;

	err = cbcmac_setkey(tfm, in_key, key_len);
	if (err)
		return err;

	/* encrypt the zero vector */
	kernel_neon_begin();
	aes_ecb_encrypt(ctx->consts, (u8[AES_BLOCK_SIZE]){}, rk, rounds, 1, 1);
	kernel_neon_end();

	cmac_gf128_mul_by_x(consts, consts);
	cmac_gf128_mul_by_x(consts + 1, consts);

	return 0;
}

static int xcbc_setkey(struct crypto_shash *tfm, const u8 *in_key,
		       unsigned int key_len)
{
	static u8 const ks[3][AES_BLOCK_SIZE] = {
		{ [0 ... AES_BLOCK_SIZE - 1] = 0x1 },
		{ [0 ... AES_BLOCK_SIZE - 1] = 0x2 },
		{ [0 ... AES_BLOCK_SIZE - 1] = 0x3 },
	};

	struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
	u8 *rk = (u8 *)ctx->key.key_enc;
	int rounds = 6 + key_len / 4;
	u8 key[AES_BLOCK_SIZE];
	int err;

	err = cbcmac_setkey(tfm, in_key, key_len);
	if (err)
		return err;

	kernel_neon_begin();
	aes_ecb_encrypt(key, ks[0], rk, rounds, 1, 1);
	aes_ecb_encrypt(ctx->consts, ks[1], rk, rounds, 2, 0);
	kernel_neon_end();

	return cbcmac_setkey(tfm, key, sizeof(key));
}

static int mac_init(struct shash_desc *desc)
{
	struct mac_desc_ctx *ctx = shash_desc_ctx(desc);

	memset(ctx->dg, 0, AES_BLOCK_SIZE);
	ctx->len = 0;

	return 0;
}

static void mac_do_update(struct crypto_aes_ctx *ctx, u8 const in[], int blocks,
			  u8 dg[], int enc_before, int enc_after)
{
	int rounds = 6 + ctx->key_length / 4;

	if (may_use_simd()) {
		kernel_neon_begin();
		aes_mac_update(in, ctx->key_enc, rounds, blocks, dg, enc_before,
			       enc_after);
		kernel_neon_end();
	} else {
		if (enc_before)
			__aes_arm64_encrypt(ctx->key_enc, dg, dg, rounds);

		while (blocks--) {
			crypto_xor(dg, in, AES_BLOCK_SIZE);
			in += AES_BLOCK_SIZE;

			if (blocks || enc_after)
				__aes_arm64_encrypt(ctx->key_enc, dg, dg,
						    rounds);
		}
	}
}

static int mac_update(struct shash_desc *desc, const u8 *p, unsigned int len)
{
	struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct mac_desc_ctx *ctx = shash_desc_ctx(desc);

	while (len > 0) {
		unsigned int l;

		if ((ctx->len % AES_BLOCK_SIZE) == 0 &&
		    (ctx->len + len) > AES_BLOCK_SIZE) {

			int blocks = len / AES_BLOCK_SIZE;

			len %= AES_BLOCK_SIZE;

			mac_do_update(&tctx->key, p, blocks, ctx->dg,
				      (ctx->len != 0), (len != 0));

			p += blocks * AES_BLOCK_SIZE;

			if (!len) {
				ctx->len = AES_BLOCK_SIZE;
				break;
			}
			ctx->len = 0;
		}

		l = min(len, AES_BLOCK_SIZE - ctx->len);

		if (l <= AES_BLOCK_SIZE) {
			crypto_xor(ctx->dg + ctx->len, p, l);
			ctx->len += l;
			len -= l;
			p += l;
		}
	}

	return 0;
}

static int cbcmac_final(struct shash_desc *desc, u8 *out)
{
	struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct mac_desc_ctx *ctx = shash_desc_ctx(desc);

	mac_do_update(&tctx->key, NULL, 0, ctx->dg, 1, 0);

	memcpy(out, ctx->dg, AES_BLOCK_SIZE);

	return 0;
}

static int cmac_final(struct shash_desc *desc, u8 *out)
{
	struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
	struct mac_desc_ctx *ctx = shash_desc_ctx(desc);
	u8 *consts = tctx->consts;

	if (ctx->len != AES_BLOCK_SIZE) {
		ctx->dg[ctx->len] ^= 0x80;
		consts += AES_BLOCK_SIZE;
	}

	mac_do_update(&tctx->key, consts, 1, ctx->dg, 0, 1);

	memcpy(out, ctx->dg, AES_BLOCK_SIZE);

	return 0;
}

static struct shash_alg mac_algs[] = { {
	.base.cra_name		= "cmac(aes)",
	.base.cra_driver_name	= "cmac-aes-" MODE,
	.base.cra_priority	= PRIO,
	.base.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct mac_tfm_ctx) +
				  2 * AES_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= AES_BLOCK_SIZE,
	.init			= mac_init,
	.update			= mac_update,
	.final			= cmac_final,
	.setkey			= cmac_setkey,
	.descsize		= sizeof(struct mac_desc_ctx),
}, {
	.base.cra_name		= "xcbc(aes)",
	.base.cra_driver_name	= "xcbc-aes-" MODE,
	.base.cra_priority	= PRIO,
	.base.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
	.base.cra_blocksize	= AES_BLOCK_SIZE,
	.base.cra_ctxsize	= sizeof(struct mac_tfm_ctx) +
				  2 * AES_BLOCK_SIZE,
	.base.cra_module	= THIS_MODULE,

	.digestsize		= AES_BLOCK_SIZE,
	.init			= mac_init,
	.update			= mac_update,
	.final			= cmac_final,
	.setkey			= xcbc_setkey,
	.descsize		= sizeof(struct mac_desc_ctx),
}, {
	.base.cra_name		= "cbcmac(aes)",
	.base.cra_driver_name	= "cbcmac-aes-" MODE,
	.base.cra_priority	= PRIO,
	.base.cra_flags		= CRYPTO_ALG_TYPE_SHASH,
	.base.cra_blocksize	= 1,
	.base.cra_ctxsize	= sizeof(struct mac_tfm_ctx),
	.base.cra_module	= THIS_MODULE,

	.digestsize		= AES_BLOCK_SIZE,
	.init			= mac_init,
	.update			= mac_update,
	.final			= cbcmac_final,
	.setkey			= cbcmac_setkey,
	.descsize		= sizeof(struct mac_desc_ctx),
} };

static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];

static void aes_exit(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++)
		if (aes_simd_algs[i])
			simd_skcipher_free(aes_simd_algs[i]);

	crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs));
	crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
}

static int __init aes_init(void)
{
	struct simd_skcipher_alg *simd;
	const char *basename;
	const char *algname;
	const char *drvname;
	int err;
	int i;

	err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
	if (err)
		return err;

	err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs));
	if (err)
		goto unregister_ciphers;

	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
		if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL))
			continue;

		algname = aes_algs[i].base.cra_name + 2;
		drvname = aes_algs[i].base.cra_driver_name + 2;
		basename = aes_algs[i].base.cra_driver_name;
		simd = simd_skcipher_create_compat(algname, drvname, basename);
		err = PTR_ERR(simd);
		if (IS_ERR(simd))
			goto unregister_simds;

		aes_simd_algs[i] = simd;
	}

	return 0;

unregister_simds:
	aes_exit();
	return err;
unregister_ciphers:
	crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
	return err;
}

#ifdef USE_V8_CRYPTO_EXTENSIONS
module_cpu_feature_match(AES, aes_init);
#else
module_init(aes_init);
EXPORT_SYMBOL(neon_aes_ecb_encrypt);
EXPORT_SYMBOL(neon_aes_cbc_encrypt);
#endif
module_exit(aes_exit);