summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/cavium/nitrox/nitrox_skcipher.c
blob: 248b4fff1c729d6a80361b294356098ea0fbffc1 (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
// SPDX-License-Identifier: GPL-2.0
#include <linux/crypto.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/printk.h>

#include <crypto/aes.h>
#include <crypto/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/ctr.h>
#include <crypto/internal/des.h>
#include <crypto/xts.h>

#include "nitrox_dev.h"
#include "nitrox_common.h"
#include "nitrox_req.h"

struct nitrox_cipher {
	const char *name;
	enum flexi_cipher value;
};

/*
 * supported cipher list
 */
static const struct nitrox_cipher flexi_cipher_table[] = {
	{ "null",		CIPHER_NULL },
	{ "cbc(des3_ede)",	CIPHER_3DES_CBC },
	{ "ecb(des3_ede)",	CIPHER_3DES_ECB },
	{ "cbc(aes)",		CIPHER_AES_CBC },
	{ "ecb(aes)",		CIPHER_AES_ECB },
	{ "cfb(aes)",		CIPHER_AES_CFB },
	{ "rfc3686(ctr(aes))",	CIPHER_AES_CTR },
	{ "xts(aes)",		CIPHER_AES_XTS },
	{ "cts(cbc(aes))",	CIPHER_AES_CBC_CTS },
	{ NULL,			CIPHER_INVALID }
};

static enum flexi_cipher flexi_cipher_type(const char *name)
{
	const struct nitrox_cipher *cipher = flexi_cipher_table;

	while (cipher->name) {
		if (!strcmp(cipher->name, name))
			break;
		cipher++;
	}
	return cipher->value;
}

static void free_src_sglist(struct skcipher_request *skreq)
{
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);

	kfree(nkreq->src);
}

static void free_dst_sglist(struct skcipher_request *skreq)
{
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);

	kfree(nkreq->dst);
}

static void nitrox_skcipher_callback(void *arg, int err)
{
	struct skcipher_request *skreq = arg;

	free_src_sglist(skreq);
	free_dst_sglist(skreq);
	if (err) {
		pr_err_ratelimited("request failed status 0x%0x\n", err);
		err = -EINVAL;
	}

	skcipher_request_complete(skreq, err);
}

static void nitrox_cbc_cipher_callback(void *arg, int err)
{
	struct skcipher_request *skreq = arg;
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
	int ivsize = crypto_skcipher_ivsize(cipher);
	unsigned int start = skreq->cryptlen - ivsize;

	if (err) {
		nitrox_skcipher_callback(arg, err);
		return;
	}

	if (nkreq->creq.ctrl.s.arg == ENCRYPT) {
		scatterwalk_map_and_copy(skreq->iv, skreq->dst, start, ivsize,
					 0);
	} else {
		if (skreq->src != skreq->dst) {
			scatterwalk_map_and_copy(skreq->iv, skreq->src, start,
						 ivsize, 0);
		} else {
			memcpy(skreq->iv, nkreq->iv_out, ivsize);
			kfree(nkreq->iv_out);
		}
	}

	nitrox_skcipher_callback(arg, err);
}

static int nitrox_skcipher_init(struct crypto_skcipher *tfm)
{
	struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);
	struct crypto_ctx_hdr *chdr;

	/* get the first device */
	nctx->ndev = nitrox_get_first_device();
	if (!nctx->ndev)
		return -ENODEV;

	/* allocate nitrox crypto context */
	chdr = crypto_alloc_context(nctx->ndev);
	if (!chdr) {
		nitrox_put_device(nctx->ndev);
		return -ENOMEM;
	}

	nctx->callback = nitrox_skcipher_callback;
	nctx->chdr = chdr;
	nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
					 sizeof(struct ctx_hdr));
	crypto_skcipher_set_reqsize(tfm, crypto_skcipher_reqsize(tfm) +
				    sizeof(struct nitrox_kcrypt_request));
	return 0;
}

static int nitrox_cbc_init(struct crypto_skcipher *tfm)
{
	int err;
	struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);

	err = nitrox_skcipher_init(tfm);
	if (err)
		return err;

	nctx->callback = nitrox_cbc_cipher_callback;
	return 0;
}

static void nitrox_skcipher_exit(struct crypto_skcipher *tfm)
{
	struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(tfm);

	/* free the nitrox crypto context */
	if (nctx->u.ctx_handle) {
		struct flexi_crypto_context *fctx = nctx->u.fctx;

		memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
		memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
		crypto_free_context((void *)nctx->chdr);
	}
	nitrox_put_device(nctx->ndev);

	nctx->u.ctx_handle = 0;
	nctx->ndev = NULL;
}

static inline int nitrox_skcipher_setkey(struct crypto_skcipher *cipher,
					 int aes_keylen, const u8 *key,
					 unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
	struct flexi_crypto_context *fctx;
	union fc_ctx_flags *flags;
	enum flexi_cipher cipher_type;
	const char *name;

	name = crypto_tfm_alg_name(tfm);
	cipher_type = flexi_cipher_type(name);
	if (unlikely(cipher_type == CIPHER_INVALID)) {
		pr_err("unsupported cipher: %s\n", name);
		return -EINVAL;
	}

	/* fill crypto context */
	fctx = nctx->u.fctx;
	flags = &fctx->flags;
	flags->f = 0;
	flags->w0.cipher_type = cipher_type;
	flags->w0.aes_keylen = aes_keylen;
	flags->w0.iv_source = IV_FROM_DPTR;
	flags->f = cpu_to_be64(*(u64 *)&flags->w0);
	/* copy the key to context */
	memcpy(fctx->crypto.u.key, key, keylen);

	return 0;
}

static int nitrox_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
			     unsigned int keylen)
{
	int aes_keylen;

	aes_keylen = flexi_aes_keylen(keylen);
	if (aes_keylen < 0)
		return -EINVAL;
	return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}

static int alloc_src_sglist(struct skcipher_request *skreq, int ivsize)
{
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
	int nents = sg_nents(skreq->src) + 1;
	int ret;

	/* Allocate buffer to hold IV and input scatterlist array */
	ret = alloc_src_req_buf(nkreq, nents, ivsize);
	if (ret)
		return ret;

	nitrox_creq_copy_iv(nkreq->src, skreq->iv, ivsize);
	nitrox_creq_set_src_sg(nkreq, nents, ivsize, skreq->src,
			       skreq->cryptlen);

	return 0;
}

static int alloc_dst_sglist(struct skcipher_request *skreq, int ivsize)
{
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
	int nents = sg_nents(skreq->dst) + 3;
	int ret;

	/* Allocate buffer to hold ORH, COMPLETION and output scatterlist
	 * array
	 */
	ret = alloc_dst_req_buf(nkreq, nents);
	if (ret)
		return ret;

	nitrox_creq_set_orh(nkreq);
	nitrox_creq_set_comp(nkreq);
	nitrox_creq_set_dst_sg(nkreq, nents, ivsize, skreq->dst,
			       skreq->cryptlen);

	return 0;
}

static int nitrox_skcipher_crypt(struct skcipher_request *skreq, bool enc)
{
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
	struct nitrox_crypto_ctx *nctx = crypto_skcipher_ctx(cipher);
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
	int ivsize = crypto_skcipher_ivsize(cipher);
	struct se_crypto_request *creq;
	int ret;

	creq = &nkreq->creq;
	creq->flags = skreq->base.flags;
	creq->gfp = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
		     GFP_KERNEL : GFP_ATOMIC;

	/* fill the request */
	creq->ctrl.value = 0;
	creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
	creq->ctrl.s.arg = (enc ? ENCRYPT : DECRYPT);
	/* param0: length of the data to be encrypted */
	creq->gph.param0 = cpu_to_be16(skreq->cryptlen);
	creq->gph.param1 = 0;
	/* param2: encryption data offset */
	creq->gph.param2 = cpu_to_be16(ivsize);
	creq->gph.param3 = 0;

	creq->ctx_handle = nctx->u.ctx_handle;
	creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);

	ret = alloc_src_sglist(skreq, ivsize);
	if (ret)
		return ret;

	ret = alloc_dst_sglist(skreq, ivsize);
	if (ret) {
		free_src_sglist(skreq);
		return ret;
	}

	/* send the crypto request */
	return nitrox_process_se_request(nctx->ndev, creq, nctx->callback,
					 skreq);
}

static int nitrox_cbc_decrypt(struct skcipher_request *skreq)
{
	struct nitrox_kcrypt_request *nkreq = skcipher_request_ctx(skreq);
	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(skreq);
	int ivsize = crypto_skcipher_ivsize(cipher);
	gfp_t flags = (skreq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
			GFP_KERNEL : GFP_ATOMIC;
	unsigned int start = skreq->cryptlen - ivsize;

	if (skreq->src != skreq->dst)
		return nitrox_skcipher_crypt(skreq, false);

	nkreq->iv_out = kmalloc(ivsize, flags);
	if (!nkreq->iv_out)
		return -ENOMEM;

	scatterwalk_map_and_copy(nkreq->iv_out, skreq->src, start, ivsize, 0);
	return nitrox_skcipher_crypt(skreq, false);
}

static int nitrox_aes_encrypt(struct skcipher_request *skreq)
{
	return nitrox_skcipher_crypt(skreq, true);
}

static int nitrox_aes_decrypt(struct skcipher_request *skreq)
{
	return nitrox_skcipher_crypt(skreq, false);
}

static int nitrox_3des_setkey(struct crypto_skcipher *cipher,
			      const u8 *key, unsigned int keylen)
{
	return verify_skcipher_des3_key(cipher, key) ?:
	       nitrox_skcipher_setkey(cipher, 0, key, keylen);
}

static int nitrox_3des_encrypt(struct skcipher_request *skreq)
{
	return nitrox_skcipher_crypt(skreq, true);
}

static int nitrox_3des_decrypt(struct skcipher_request *skreq)
{
	return nitrox_skcipher_crypt(skreq, false);
}

static int nitrox_aes_xts_setkey(struct crypto_skcipher *cipher,
				 const u8 *key, unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
	struct flexi_crypto_context *fctx;
	int aes_keylen, ret;

	ret = xts_check_key(tfm, key, keylen);
	if (ret)
		return ret;

	keylen /= 2;

	aes_keylen = flexi_aes_keylen(keylen);
	if (aes_keylen < 0)
		return -EINVAL;

	fctx = nctx->u.fctx;
	/* copy KEY2 */
	memcpy(fctx->auth.u.key2, (key + keylen), keylen);

	return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}

static int nitrox_aes_ctr_rfc3686_setkey(struct crypto_skcipher *cipher,
					 const u8 *key, unsigned int keylen)
{
	struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
	struct nitrox_crypto_ctx *nctx = crypto_tfm_ctx(tfm);
	struct flexi_crypto_context *fctx;
	int aes_keylen;

	if (keylen < CTR_RFC3686_NONCE_SIZE)
		return -EINVAL;

	fctx = nctx->u.fctx;

	memcpy(fctx->crypto.iv, key + (keylen - CTR_RFC3686_NONCE_SIZE),
	       CTR_RFC3686_NONCE_SIZE);

	keylen -= CTR_RFC3686_NONCE_SIZE;

	aes_keylen = flexi_aes_keylen(keylen);
	if (aes_keylen < 0)
		return -EINVAL;
	return nitrox_skcipher_setkey(cipher, aes_keylen, key, keylen);
}

static struct skcipher_alg nitrox_skciphers[] = { {
	.base = {
		.cra_name = "cbc(aes)",
		.cra_driver_name = "n5_cbc(aes)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = AES_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = nitrox_aes_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_cbc_decrypt,
	.init = nitrox_cbc_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "ecb(aes)",
		.cra_driver_name = "n5_ecb(aes)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = AES_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = nitrox_aes_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_aes_decrypt,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "cfb(aes)",
		.cra_driver_name = "n5_cfb(aes)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = AES_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = nitrox_aes_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_aes_decrypt,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "xts(aes)",
		.cra_driver_name = "n5_xts(aes)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = AES_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = 2 * AES_MIN_KEY_SIZE,
	.max_keysize = 2 * AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = nitrox_aes_xts_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_aes_decrypt,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "rfc3686(ctr(aes))",
		.cra_driver_name = "n5_rfc3686(ctr(aes))",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = 1,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
	.ivsize = CTR_RFC3686_IV_SIZE,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
	.setkey = nitrox_aes_ctr_rfc3686_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_aes_decrypt,
}, {
	.base = {
		.cra_name = "cts(cbc(aes))",
		.cra_driver_name = "n5_cts(cbc(aes))",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = AES_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = nitrox_aes_setkey,
	.encrypt = nitrox_aes_encrypt,
	.decrypt = nitrox_aes_decrypt,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "cbc(des3_ede)",
		.cra_driver_name = "n5_cbc(des3_ede)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = DES3_EDE_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = DES3_EDE_KEY_SIZE,
	.max_keysize = DES3_EDE_KEY_SIZE,
	.ivsize = DES3_EDE_BLOCK_SIZE,
	.setkey = nitrox_3des_setkey,
	.encrypt = nitrox_3des_encrypt,
	.decrypt = nitrox_cbc_decrypt,
	.init = nitrox_cbc_init,
	.exit = nitrox_skcipher_exit,
}, {
	.base = {
		.cra_name = "ecb(des3_ede)",
		.cra_driver_name = "n5_ecb(des3_ede)",
		.cra_priority = PRIO,
		.cra_flags = CRYPTO_ALG_ASYNC | CRYPTO_ALG_ALLOCATES_MEMORY,
		.cra_blocksize = DES3_EDE_BLOCK_SIZE,
		.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
		.cra_alignmask = 0,
		.cra_module = THIS_MODULE,
	},
	.min_keysize = DES3_EDE_KEY_SIZE,
	.max_keysize = DES3_EDE_KEY_SIZE,
	.ivsize = DES3_EDE_BLOCK_SIZE,
	.setkey = nitrox_3des_setkey,
	.encrypt = nitrox_3des_encrypt,
	.decrypt = nitrox_3des_decrypt,
	.init = nitrox_skcipher_init,
	.exit = nitrox_skcipher_exit,
}

};

int nitrox_register_skciphers(void)
{
	return crypto_register_skciphers(nitrox_skciphers,
					 ARRAY_SIZE(nitrox_skciphers));
}

void nitrox_unregister_skciphers(void)
{
	crypto_unregister_skciphers(nitrox_skciphers,
				    ARRAY_SIZE(nitrox_skciphers));
}