summaryrefslogtreecommitdiff
path: root/drivers/crypto/amcc/crypto4xx_alg.c
blob: 4092c2aad8e2119038a426d899c055f506240e7f (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
/**
 * AMCC SoC PPC4xx Crypto Driver
 *
 * Copyright (c) 2008 Applied Micro Circuits Corporation.
 * All rights reserved. James Hsiao <jhsiao@amcc.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This file implements the Linux crypto algorithms.
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/spinlock_types.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <linux/hash.h>
#include <crypto/internal/hash.h>
#include <linux/dma-mapping.h>
#include <crypto/algapi.h>
#include <crypto/aead.h>
#include <crypto/aes.h>
#include <crypto/gcm.h>
#include <crypto/sha.h>
#include <crypto/ctr.h>
#include <crypto/skcipher.h>
#include "crypto4xx_reg_def.h"
#include "crypto4xx_core.h"
#include "crypto4xx_sa.h"

static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
				     u32 save_iv, u32 ld_h, u32 ld_iv,
				     u32 hdr_proc, u32 h, u32 c, u32 pad_type,
				     u32 op_grp, u32 op, u32 dir)
{
	sa->sa_command_0.w = 0;
	sa->sa_command_0.bf.save_hash_state = save_h;
	sa->sa_command_0.bf.save_iv = save_iv;
	sa->sa_command_0.bf.load_hash_state = ld_h;
	sa->sa_command_0.bf.load_iv = ld_iv;
	sa->sa_command_0.bf.hdr_proc = hdr_proc;
	sa->sa_command_0.bf.hash_alg = h;
	sa->sa_command_0.bf.cipher_alg = c;
	sa->sa_command_0.bf.pad_type = pad_type & 3;
	sa->sa_command_0.bf.extend_pad = pad_type >> 2;
	sa->sa_command_0.bf.op_group = op_grp;
	sa->sa_command_0.bf.opcode = op;
	sa->sa_command_0.bf.dir = dir;
}

static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
				     u32 hmac_mc, u32 cfb, u32 esn,
				     u32 sn_mask, u32 mute, u32 cp_pad,
				     u32 cp_pay, u32 cp_hdr)
{
	sa->sa_command_1.w = 0;
	sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
	sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
	sa->sa_command_1.bf.feedback_mode = cfb,
	sa->sa_command_1.bf.sa_rev = 1;
	sa->sa_command_1.bf.hmac_muting = hmac_mc;
	sa->sa_command_1.bf.extended_seq_num = esn;
	sa->sa_command_1.bf.seq_num_mask = sn_mask;
	sa->sa_command_1.bf.mutable_bit_proc = mute;
	sa->sa_command_1.bf.copy_pad = cp_pad;
	sa->sa_command_1.bf.copy_payload = cp_pay;
	sa->sa_command_1.bf.copy_hdr = cp_hdr;
}

static inline int crypto4xx_crypt(struct skcipher_request *req,
				  const unsigned int ivlen, bool decrypt)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	__le32 iv[AES_IV_SIZE];

	if (ivlen)
		crypto4xx_memcpy_to_le32(iv, req->iv, ivlen);

	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
		req->cryptlen, iv, ivlen, decrypt ? ctx->sa_in : ctx->sa_out,
		ctx->sa_len, 0, NULL);
}

int crypto4xx_encrypt_noiv(struct skcipher_request *req)
{
	return crypto4xx_crypt(req, 0, false);
}

int crypto4xx_encrypt_iv(struct skcipher_request *req)
{
	return crypto4xx_crypt(req, AES_IV_SIZE, false);
}

int crypto4xx_decrypt_noiv(struct skcipher_request *req)
{
	return crypto4xx_crypt(req, 0, true);
}

int crypto4xx_decrypt_iv(struct skcipher_request *req)
{
	return crypto4xx_crypt(req, AES_IV_SIZE, true);
}

/**
 * AES Functions
 */
static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher,
				const u8 *key,
				unsigned int keylen,
				unsigned char cm,
				u8 fb)
{
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	struct dynamic_sa_ctl *sa;
	int    rc;

	if (keylen != AES_KEYSIZE_256 &&
		keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
		crypto_skcipher_set_flags(cipher,
				CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	/* Create SA */
	if (ctx->sa_in || ctx->sa_out)
		crypto4xx_free_sa(ctx);

	rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
	if (rc)
		return rc;

	/* Setup SA */
	sa = ctx->sa_in;

	set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_CBC ?
				 SA_SAVE_IV : SA_NOT_SAVE_IV),
				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
				 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
				 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
				 DIR_INBOUND);

	set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
				 fb, SA_EXTENDED_SN_OFF,
				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
				 SA_NOT_COPY_HDR);
	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
				 key, keylen);
	sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
	sa->sa_command_1.bf.key_len = keylen >> 3;

	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
	sa = ctx->sa_out;
	sa->sa_command_0.bf.dir = DIR_OUTBOUND;

	return 0;
}

int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
				    CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_setkey_aes_cfb(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CFB,
				    CRYPTO_FEEDBACK_MODE_128BIT_CFB);
}

int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
				    CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_setkey_aes_ofb(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_OFB,
				    CRYPTO_FEEDBACK_MODE_64BIT_OFB);
}

int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	int rc;

	rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
		CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
	if (rc)
		return rc;

	ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
						 CTR_RFC3686_NONCE_SIZE]);

	return 0;
}

int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	__le32 iv[AES_IV_SIZE / 4] = {
		ctx->iv_nonce,
		cpu_to_le32p((u32 *) req->iv),
		cpu_to_le32p((u32 *) (req->iv + 4)),
		cpu_to_le32(1) };

	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
				  req->cryptlen, iv, AES_IV_SIZE,
				  ctx->sa_out, ctx->sa_len, 0, NULL);
}

int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	__le32 iv[AES_IV_SIZE / 4] = {
		ctx->iv_nonce,
		cpu_to_le32p((u32 *) req->iv),
		cpu_to_le32p((u32 *) (req->iv + 4)),
		cpu_to_le32(1) };

	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
				  req->cryptlen, iv, AES_IV_SIZE,
				  ctx->sa_out, ctx->sa_len, 0, NULL);
}

static int
crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	size_t iv_len = crypto_skcipher_ivsize(cipher);
	unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
	unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
			AES_BLOCK_SIZE;

	/*
	 * The hardware uses only the last 32-bits as the counter while the
	 * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
	 * the whole IV is a counter.  So fallback if the counter is going to
	 * overlow.
	 */
	if (counter + nblks < counter) {
		struct skcipher_request *subreq = skcipher_request_ctx(req);
		int ret;

		skcipher_request_set_tfm(subreq, ctx->sw_cipher.cipher);
		skcipher_request_set_callback(subreq, req->base.flags,
			NULL, NULL);
		skcipher_request_set_crypt(subreq, req->src, req->dst,
			req->cryptlen, req->iv);
		ret = encrypt ? crypto_skcipher_encrypt(subreq)
			: crypto_skcipher_decrypt(subreq);
		skcipher_request_zero(subreq);
		return ret;
	}

	return encrypt ? crypto4xx_encrypt_iv(req)
		       : crypto4xx_decrypt_iv(req);
}

static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
				       struct crypto_skcipher *cipher,
				       const u8 *key,
				       unsigned int keylen)
{
	int rc;

	crypto_skcipher_clear_flags(ctx->sw_cipher.cipher,
				    CRYPTO_TFM_REQ_MASK);
	crypto_skcipher_set_flags(ctx->sw_cipher.cipher,
		crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
	rc = crypto_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
	crypto_skcipher_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
	crypto_skcipher_set_flags(cipher,
		crypto_skcipher_get_flags(ctx->sw_cipher.cipher) &
			CRYPTO_TFM_RES_MASK);

	return rc;
}

int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
			     const u8 *key, unsigned int keylen)
{
	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
	int rc;

	rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
	if (rc)
		return rc;

	return crypto4xx_setkey_aes(cipher, key, keylen,
		CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
}

int crypto4xx_encrypt_ctr(struct skcipher_request *req)
{
	return crypto4xx_ctr_crypt(req, true);
}

int crypto4xx_decrypt_ctr(struct skcipher_request *req)
{
	return crypto4xx_ctr_crypt(req, false);
}

static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
						unsigned int len,
						bool is_ccm, bool decrypt)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);

	/* authsize has to be a multiple of 4 */
	if (aead->authsize & 3)
		return true;

	/*
	 * hardware does not handle cases where plaintext
	 * is less than a block.
	 */
	if (len < AES_BLOCK_SIZE)
		return true;

	/* assoc len needs to be a multiple of 4 and <= 1020 */
	if (req->assoclen & 0x3 || req->assoclen > 1020)
		return true;

	/* CCM supports only counter field length of 2 and 4 bytes */
	if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
		return true;

	return false;
}

static int crypto4xx_aead_fallback(struct aead_request *req,
	struct crypto4xx_ctx *ctx, bool do_decrypt)
{
	struct aead_request *subreq = aead_request_ctx(req);

	aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
	aead_request_set_callback(subreq, req->base.flags,
				  req->base.complete, req->base.data);
	aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
			       req->iv);
	aead_request_set_ad(subreq, req->assoclen);
	return do_decrypt ? crypto_aead_decrypt(subreq) :
			    crypto_aead_encrypt(subreq);
}

static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
					 struct crypto_aead *cipher,
					 const u8 *key,
					 unsigned int keylen)
{
	int rc;

	crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
	crypto_aead_set_flags(ctx->sw_cipher.aead,
		crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
	rc = crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
	crypto_aead_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
	crypto_aead_set_flags(cipher,
		crypto_aead_get_flags(ctx->sw_cipher.aead) &
			CRYPTO_TFM_RES_MASK);

	return rc;
}

/**
 * AES-CCM Functions
 */

int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
			     unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
	struct dynamic_sa_ctl *sa;
	int rc = 0;

	rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
	if (rc)
		return rc;

	if (ctx->sa_in || ctx->sa_out)
		crypto4xx_free_sa(ctx);

	rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
	if (rc)
		return rc;

	/* Setup SA */
	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
	sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);

	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
				 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
				 SA_CIPHER_ALG_AES,
				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
				 SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);

	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
				 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
				 SA_NOT_COPY_HDR);

	sa->sa_command_1.bf.key_len = keylen >> 3;

	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);

	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
	sa = (struct dynamic_sa_ctl *) ctx->sa_out;

	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
				 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
				 SA_CIPHER_ALG_AES,
				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
				 SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);

	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
				 SA_COPY_PAD, SA_COPY_PAYLOAD,
				 SA_NOT_COPY_HDR);

	sa->sa_command_1.bf.key_len = keylen >> 3;
	return 0;
}

static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
{
	struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
	struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	__le32 iv[16];
	u32 tmp_sa[SA_AES128_CCM_LEN + 4];
	struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
	unsigned int len = req->cryptlen;

	if (decrypt)
		len -= crypto_aead_authsize(aead);

	if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
		return crypto4xx_aead_fallback(req, ctx, decrypt);

	memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
	sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;

	if (req->iv[0] == 1) {
		/* CRYPTO_MODE_AES_ICM */
		sa->sa_command_1.bf.crypto_mode9_8 = 1;
	}

	iv[3] = cpu_to_le32(0);
	crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));

	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
				  len, iv, sizeof(iv),
				  sa, ctx->sa_len, req->assoclen, rctx->dst);
}

int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
{
	return crypto4xx_crypt_aes_ccm(req, false);
}

int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
{
	return crypto4xx_crypt_aes_ccm(req, true);
}

int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
			       unsigned int authsize)
{
	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);

	return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
}

/**
 * AES-GCM Functions
 */

static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
{
	switch (keylen) {
	case 16:
	case 24:
	case 32:
		return 0;
	default:
		return -EINVAL;
	}
}

static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
					     unsigned int keylen)
{
	struct crypto_cipher *aes_tfm = NULL;
	uint8_t src[16] = { 0 };
	int rc = 0;

	aes_tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(aes_tfm)) {
		rc = PTR_ERR(aes_tfm);
		pr_warn("could not load aes cipher driver: %d\n", rc);
		return rc;
	}

	rc = crypto_cipher_setkey(aes_tfm, key, keylen);
	if (rc) {
		pr_err("setkey() failed: %d\n", rc);
		goto out;
	}

	crypto_cipher_encrypt_one(aes_tfm, src, src);
	crypto4xx_memcpy_to_le32(hash_start, src, 16);
out:
	crypto_free_cipher(aes_tfm);
	return rc;
}

int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
			     const u8 *key, unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
	struct dynamic_sa_ctl *sa;
	int    rc = 0;

	if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0) {
		crypto_aead_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}

	rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
	if (rc)
		return rc;

	if (ctx->sa_in || ctx->sa_out)
		crypto4xx_free_sa(ctx);

	rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
	if (rc)
		return rc;

	sa  = (struct dynamic_sa_ctl *) ctx->sa_in;

	sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
				 SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
				 SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
				 DIR_INBOUND);
	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
				 SA_SEQ_MASK_ON, SA_MC_DISABLE,
				 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
				 SA_NOT_COPY_HDR);

	sa->sa_command_1.bf.key_len = keylen >> 3;

	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
				 key, keylen);

	rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
		key, keylen);
	if (rc) {
		pr_err("GCM hash key setting failed = %d\n", rc);
		goto err;
	}

	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
	sa = (struct dynamic_sa_ctl *) ctx->sa_out;
	sa->sa_command_0.bf.dir = DIR_OUTBOUND;
	sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;

	return 0;
err:
	crypto4xx_free_sa(ctx);
	return rc;
}

static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
					  bool decrypt)
{
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
	__le32 iv[4];
	unsigned int len = req->cryptlen;

	if (decrypt)
		len -= crypto_aead_authsize(crypto_aead_reqtfm(req));

	if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
		return crypto4xx_aead_fallback(req, ctx, decrypt);

	crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
	iv[3] = cpu_to_le32(1);

	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
				  len, iv, sizeof(iv),
				  decrypt ? ctx->sa_in : ctx->sa_out,
				  ctx->sa_len, req->assoclen, rctx->dst);
}

int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
{
	return crypto4xx_crypt_aes_gcm(req, false);
}

int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
{
	return crypto4xx_crypt_aes_gcm(req, true);
}

/**
 * HASH SHA1 Functions
 */
static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
				   unsigned int sa_len,
				   unsigned char ha,
				   unsigned char hm)
{
	struct crypto_alg *alg = tfm->__crt_alg;
	struct crypto4xx_alg *my_alg;
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
	struct dynamic_sa_hash160 *sa;
	int rc;

	my_alg = container_of(__crypto_ahash_alg(alg), struct crypto4xx_alg,
			      alg.u.hash);
	ctx->dev   = my_alg->dev;

	/* Create SA */
	if (ctx->sa_in || ctx->sa_out)
		crypto4xx_free_sa(ctx);

	rc = crypto4xx_alloc_sa(ctx, sa_len);
	if (rc)
		return rc;

	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
				 sizeof(struct crypto4xx_ctx));
	sa = (struct dynamic_sa_hash160 *)ctx->sa_in;
	set_dynamic_sa_command_0(&sa->ctrl, SA_SAVE_HASH, SA_NOT_SAVE_IV,
				 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
				 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
				 SA_OPCODE_HASH, DIR_INBOUND);
	set_dynamic_sa_command_1(&sa->ctrl, 0, SA_HASH_MODE_HASH,
				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
				 SA_NOT_COPY_HDR);
	/* Need to zero hash digest in SA */
	memset(sa->inner_digest, 0, sizeof(sa->inner_digest));
	memset(sa->outer_digest, 0, sizeof(sa->outer_digest));

	return 0;
}

int crypto4xx_hash_init(struct ahash_request *req)
{
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	int ds;
	struct dynamic_sa_ctl *sa;

	sa = ctx->sa_in;
	ds = crypto_ahash_digestsize(
			__crypto_ahash_cast(req->base.tfm));
	sa->sa_command_0.bf.digest_len = ds >> 2;
	sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;

	return 0;
}

int crypto4xx_hash_update(struct ahash_request *req)
{
	struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct scatterlist dst;
	unsigned int ds = crypto_ahash_digestsize(ahash);

	sg_init_one(&dst, req->result, ds);

	return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
				  req->nbytes, NULL, 0, ctx->sa_in,
				  ctx->sa_len, 0, NULL);
}

int crypto4xx_hash_final(struct ahash_request *req)
{
	return 0;
}

int crypto4xx_hash_digest(struct ahash_request *req)
{
	struct crypto_ahash *ahash = crypto_ahash_reqtfm(req);
	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
	struct scatterlist dst;
	unsigned int ds = crypto_ahash_digestsize(ahash);

	sg_init_one(&dst, req->result, ds);

	return crypto4xx_build_pd(&req->base, ctx, req->src, &dst,
				  req->nbytes, NULL, 0, ctx->sa_in,
				  ctx->sa_len, 0, NULL);
}

/**
 * SHA1 Algorithm
 */
int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
{
	return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
				       SA_HASH_MODE_HASH);
}