1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linear symmetric key cipher operations.
4 *
5 * Generic encrypt/decrypt wrapper for ciphers.
6 *
7 * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
8 */
9
10#include <linux/cryptouser.h>
11#include <linux/err.h>
12#include <linux/export.h>
13#include <linux/kernel.h>
14#include <linux/seq_file.h>
15#include <linux/slab.h>
16#include <linux/string.h>
17#include <net/netlink.h>
18#include "skcipher.h"
19
20static inline struct crypto_lskcipher *__crypto_lskcipher_cast(
21	struct crypto_tfm *tfm)
22{
23	return container_of(tfm, struct crypto_lskcipher, base);
24}
25
26static inline struct lskcipher_alg *__crypto_lskcipher_alg(
27	struct crypto_alg *alg)
28{
29	return container_of(alg, struct lskcipher_alg, co.base);
30}
31
32static inline struct crypto_istat_cipher *lskcipher_get_stat(
33	struct lskcipher_alg *alg)
34{
35	return skcipher_get_stat_common(&alg->co);
36}
37
38static inline int crypto_lskcipher_errstat(struct lskcipher_alg *alg, int err)
39{
40	struct crypto_istat_cipher *istat = lskcipher_get_stat(alg);
41
42	if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
43		return err;
44
45	if (err)
46		atomic64_inc(&istat->err_cnt);
47
48	return err;
49}
50
51static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm,
52				      const u8 *key, unsigned int keylen)
53{
54	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
55	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
56	u8 *buffer, *alignbuffer;
57	unsigned long absize;
58	int ret;
59
60	absize = keylen + alignmask;
61	buffer = kmalloc(absize, GFP_ATOMIC);
62	if (!buffer)
63		return -ENOMEM;
64
65	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
66	memcpy(alignbuffer, key, keylen);
67	ret = cipher->setkey(tfm, alignbuffer, keylen);
68	kfree_sensitive(buffer);
69	return ret;
70}
71
72int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key,
73			    unsigned int keylen)
74{
75	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
76	struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm);
77
78	if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize)
79		return -EINVAL;
80
81	if ((unsigned long)key & alignmask)
82		return lskcipher_setkey_unaligned(tfm, key, keylen);
83	else
84		return cipher->setkey(tfm, key, keylen);
85}
86EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey);
87
88static int crypto_lskcipher_crypt_unaligned(
89	struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len,
90	u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src,
91			     u8 *dst, unsigned len, u8 *iv, u32 flags))
92{
93	unsigned statesize = crypto_lskcipher_statesize(tfm);
94	unsigned ivsize = crypto_lskcipher_ivsize(tfm);
95	unsigned bs = crypto_lskcipher_blocksize(tfm);
96	unsigned cs = crypto_lskcipher_chunksize(tfm);
97	int err;
98	u8 *tiv;
99	u8 *p;
100
101	BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE ||
102		     MAX_CIPHER_ALIGNMASK >= PAGE_SIZE);
103
104	tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC);
105	if (!tiv)
106		return -ENOMEM;
107
108	memcpy(tiv, iv, ivsize + statesize);
109
110	p = kmalloc(PAGE_SIZE, GFP_ATOMIC);
111	err = -ENOMEM;
112	if (!p)
113		goto out;
114
115	while (len >= bs) {
116		unsigned chunk = min((unsigned)PAGE_SIZE, len);
117		int err;
118
119		if (chunk > cs)
120			chunk &= ~(cs - 1);
121
122		memcpy(p, src, chunk);
123		err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL);
124		if (err)
125			goto out;
126
127		memcpy(dst, p, chunk);
128		src += chunk;
129		dst += chunk;
130		len -= chunk;
131	}
132
133	err = len ? -EINVAL : 0;
134
135out:
136	memcpy(iv, tiv, ivsize + statesize);
137	kfree_sensitive(p);
138	kfree_sensitive(tiv);
139	return err;
140}
141
142static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src,
143				  u8 *dst, unsigned len, u8 *iv,
144				  int (*crypt)(struct crypto_lskcipher *tfm,
145					       const u8 *src, u8 *dst,
146					       unsigned len, u8 *iv,
147					       u32 flags))
148{
149	unsigned long alignmask = crypto_lskcipher_alignmask(tfm);
150	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
151	int ret;
152
153	if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) &
154	    alignmask) {
155		ret = crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv,
156						       crypt);
157		goto out;
158	}
159
160	ret = crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL);
161
162out:
163	return crypto_lskcipher_errstat(alg, ret);
164}
165
166int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src,
167			     u8 *dst, unsigned len, u8 *iv)
168{
169	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
170
171	if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
172		struct crypto_istat_cipher *istat = lskcipher_get_stat(alg);
173
174		atomic64_inc(&istat->encrypt_cnt);
175		atomic64_add(len, &istat->encrypt_tlen);
176	}
177
178	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt);
179}
180EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt);
181
182int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src,
183			     u8 *dst, unsigned len, u8 *iv)
184{
185	struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm);
186
187	if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
188		struct crypto_istat_cipher *istat = lskcipher_get_stat(alg);
189
190		atomic64_inc(&istat->decrypt_cnt);
191		atomic64_add(len, &istat->decrypt_tlen);
192	}
193
194	return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt);
195}
196EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt);
197
198static int crypto_lskcipher_crypt_sg(struct skcipher_request *req,
199				     int (*crypt)(struct crypto_lskcipher *tfm,
200						  const u8 *src, u8 *dst,
201						  unsigned len, u8 *ivs,
202						  u32 flags))
203{
204	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
205	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
206	u8 *ivs = skcipher_request_ctx(req);
207	struct crypto_lskcipher *tfm = *ctx;
208	struct skcipher_walk walk;
209	unsigned ivsize;
210	u32 flags;
211	int err;
212
213	ivsize = crypto_lskcipher_ivsize(tfm);
214	ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1);
215	memcpy(ivs, req->iv, ivsize);
216
217	flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
218
219	if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT)
220		flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
221
222	if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL))
223		flags |= CRYPTO_LSKCIPHER_FLAG_FINAL;
224
225	err = skcipher_walk_virt(&walk, req, false);
226
227	while (walk.nbytes) {
228		err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr,
229			    walk.nbytes, ivs,
230			    flags & ~(walk.nbytes == walk.total ?
231			    0 : CRYPTO_LSKCIPHER_FLAG_FINAL));
232		err = skcipher_walk_done(&walk, err);
233		flags |= CRYPTO_LSKCIPHER_FLAG_CONT;
234	}
235
236	memcpy(req->iv, ivs, ivsize);
237
238	return err;
239}
240
241int crypto_lskcipher_encrypt_sg(struct skcipher_request *req)
242{
243	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
244	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
245	struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);
246
247	return crypto_lskcipher_crypt_sg(req, alg->encrypt);
248}
249
250int crypto_lskcipher_decrypt_sg(struct skcipher_request *req)
251{
252	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
253	struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher);
254	struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx);
255
256	return crypto_lskcipher_crypt_sg(req, alg->decrypt);
257}
258
259static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm)
260{
261	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
262	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);
263
264	alg->exit(skcipher);
265}
266
267static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm)
268{
269	struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm);
270	struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher);
271
272	if (alg->exit)
273		skcipher->base.exit = crypto_lskcipher_exit_tfm;
274
275	if (alg->init)
276		return alg->init(skcipher);
277
278	return 0;
279}
280
281static void crypto_lskcipher_free_instance(struct crypto_instance *inst)
282{
283	struct lskcipher_instance *skcipher =
284		container_of(inst, struct lskcipher_instance, s.base);
285
286	skcipher->free(skcipher);
287}
288
289static void __maybe_unused crypto_lskcipher_show(
290	struct seq_file *m, struct crypto_alg *alg)
291{
292	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
293
294	seq_printf(m, "type         : lskcipher\n");
295	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
296	seq_printf(m, "min keysize  : %u\n", skcipher->co.min_keysize);
297	seq_printf(m, "max keysize  : %u\n", skcipher->co.max_keysize);
298	seq_printf(m, "ivsize       : %u\n", skcipher->co.ivsize);
299	seq_printf(m, "chunksize    : %u\n", skcipher->co.chunksize);
300	seq_printf(m, "statesize    : %u\n", skcipher->co.statesize);
301}
302
303static int __maybe_unused crypto_lskcipher_report(
304	struct sk_buff *skb, struct crypto_alg *alg)
305{
306	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
307	struct crypto_report_blkcipher rblkcipher;
308
309	memset(&rblkcipher, 0, sizeof(rblkcipher));
310
311	strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type));
312	strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv));
313
314	rblkcipher.blocksize = alg->cra_blocksize;
315	rblkcipher.min_keysize = skcipher->co.min_keysize;
316	rblkcipher.max_keysize = skcipher->co.max_keysize;
317	rblkcipher.ivsize = skcipher->co.ivsize;
318
319	return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER,
320		       sizeof(rblkcipher), &rblkcipher);
321}
322
323static int __maybe_unused crypto_lskcipher_report_stat(
324	struct sk_buff *skb, struct crypto_alg *alg)
325{
326	struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg);
327	struct crypto_istat_cipher *istat;
328	struct crypto_stat_cipher rcipher;
329
330	istat = lskcipher_get_stat(skcipher);
331
332	memset(&rcipher, 0, sizeof(rcipher));
333
334	strscpy(rcipher.type, "cipher", sizeof(rcipher.type));
335
336	rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
337	rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
338	rcipher.stat_decrypt_cnt =  atomic64_read(&istat->decrypt_cnt);
339	rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
340	rcipher.stat_err_cnt =  atomic64_read(&istat->err_cnt);
341
342	return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher);
343}
344
345static const struct crypto_type crypto_lskcipher_type = {
346	.extsize = crypto_alg_extsize,
347	.init_tfm = crypto_lskcipher_init_tfm,
348	.free = crypto_lskcipher_free_instance,
349#ifdef CONFIG_PROC_FS
350	.show = crypto_lskcipher_show,
351#endif
352#if IS_ENABLED(CONFIG_CRYPTO_USER)
353	.report = crypto_lskcipher_report,
354#endif
355#ifdef CONFIG_CRYPTO_STATS
356	.report_stat = crypto_lskcipher_report_stat,
357#endif
358	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
359	.maskset = CRYPTO_ALG_TYPE_MASK,
360	.type = CRYPTO_ALG_TYPE_LSKCIPHER,
361	.tfmsize = offsetof(struct crypto_lskcipher, base),
362};
363
364static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm)
365{
366	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
367
368	crypto_free_lskcipher(*ctx);
369}
370
371int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm)
372{
373	struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm);
374	struct crypto_alg *calg = tfm->__crt_alg;
375	struct crypto_lskcipher *skcipher;
376
377	if (!crypto_mod_get(calg))
378		return -EAGAIN;
379
380	skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type);
381	if (IS_ERR(skcipher)) {
382		crypto_mod_put(calg);
383		return PTR_ERR(skcipher);
384	}
385
386	*ctx = skcipher;
387	tfm->exit = crypto_lskcipher_exit_tfm_sg;
388
389	return 0;
390}
391
392int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn,
393			  struct crypto_instance *inst,
394			  const char *name, u32 type, u32 mask)
395{
396	spawn->base.frontend = &crypto_lskcipher_type;
397	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
398}
399EXPORT_SYMBOL_GPL(crypto_grab_lskcipher);
400
401struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name,
402						u32 type, u32 mask)
403{
404	return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask);
405}
406EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher);
407
408static int lskcipher_prepare_alg(struct lskcipher_alg *alg)
409{
410	struct crypto_alg *base = &alg->co.base;
411	int err;
412
413	err = skcipher_prepare_alg_common(&alg->co);
414	if (err)
415		return err;
416
417	if (alg->co.chunksize & (alg->co.chunksize - 1))
418		return -EINVAL;
419
420	base->cra_type = &crypto_lskcipher_type;
421	base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER;
422
423	return 0;
424}
425
426int crypto_register_lskcipher(struct lskcipher_alg *alg)
427{
428	struct crypto_alg *base = &alg->co.base;
429	int err;
430
431	err = lskcipher_prepare_alg(alg);
432	if (err)
433		return err;
434
435	return crypto_register_alg(base);
436}
437EXPORT_SYMBOL_GPL(crypto_register_lskcipher);
438
439void crypto_unregister_lskcipher(struct lskcipher_alg *alg)
440{
441	crypto_unregister_alg(&alg->co.base);
442}
443EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher);
444
445int crypto_register_lskciphers(struct lskcipher_alg *algs, int count)
446{
447	int i, ret;
448
449	for (i = 0; i < count; i++) {
450		ret = crypto_register_lskcipher(&algs[i]);
451		if (ret)
452			goto err;
453	}
454
455	return 0;
456
457err:
458	for (--i; i >= 0; --i)
459		crypto_unregister_lskcipher(&algs[i]);
460
461	return ret;
462}
463EXPORT_SYMBOL_GPL(crypto_register_lskciphers);
464
465void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count)
466{
467	int i;
468
469	for (i = count - 1; i >= 0; --i)
470		crypto_unregister_lskcipher(&algs[i]);
471}
472EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers);
473
474int lskcipher_register_instance(struct crypto_template *tmpl,
475				struct lskcipher_instance *inst)
476{
477	int err;
478
479	if (WARN_ON(!inst->free))
480		return -EINVAL;
481
482	err = lskcipher_prepare_alg(&inst->alg);
483	if (err)
484		return err;
485
486	return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst));
487}
488EXPORT_SYMBOL_GPL(lskcipher_register_instance);
489
490static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key,
491				   unsigned int keylen)
492{
493	struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm);
494
495	crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
496	crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &
497				   CRYPTO_TFM_REQ_MASK);
498	return crypto_lskcipher_setkey(cipher, key, keylen);
499}
500
501static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm)
502{
503	struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);
504	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
505	struct crypto_lskcipher_spawn *spawn;
506	struct crypto_lskcipher *cipher;
507
508	spawn = lskcipher_instance_ctx(inst);
509	cipher = crypto_spawn_lskcipher(spawn);
510	if (IS_ERR(cipher))
511		return PTR_ERR(cipher);
512
513	*ctx = cipher;
514	return 0;
515}
516
517static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm)
518{
519	struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm);
520
521	crypto_free_lskcipher(*ctx);
522}
523
524static void lskcipher_free_instance_simple(struct lskcipher_instance *inst)
525{
526	crypto_drop_lskcipher(lskcipher_instance_ctx(inst));
527	kfree(inst);
528}
529
530/**
531 * lskcipher_alloc_instance_simple - allocate instance of simple block cipher
532 *
533 * Allocate an lskcipher_instance for a simple block cipher mode of operation,
534 * e.g. cbc or ecb.  The instance context will have just a single crypto_spawn,
535 * that for the underlying cipher.  The {min,max}_keysize, ivsize, blocksize,
536 * alignmask, and priority are set from the underlying cipher but can be
537 * overridden if needed.  The tfm context defaults to
538 * struct crypto_lskcipher *, and default ->setkey(), ->init(), and
539 * ->exit() methods are installed.
540 *
541 * @tmpl: the template being instantiated
542 * @tb: the template parameters
543 *
544 * Return: a pointer to the new instance, or an ERR_PTR().  The caller still
545 *	   needs to register the instance.
546 */
547struct lskcipher_instance *lskcipher_alloc_instance_simple(
548	struct crypto_template *tmpl, struct rtattr **tb)
549{
550	u32 mask;
551	struct lskcipher_instance *inst;
552	struct crypto_lskcipher_spawn *spawn;
553	char ecb_name[CRYPTO_MAX_ALG_NAME];
554	struct lskcipher_alg *cipher_alg;
555	const char *cipher_name;
556	int err;
557
558	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
559	if (err)
560		return ERR_PTR(err);
561
562	cipher_name = crypto_attr_alg_name(tb[1]);
563	if (IS_ERR(cipher_name))
564		return ERR_CAST(cipher_name);
565
566	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
567	if (!inst)
568		return ERR_PTR(-ENOMEM);
569
570	spawn = lskcipher_instance_ctx(inst);
571	err = crypto_grab_lskcipher(spawn,
572				    lskcipher_crypto_instance(inst),
573				    cipher_name, 0, mask);
574
575	ecb_name[0] = 0;
576	if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) {
577		err = -ENAMETOOLONG;
578		if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)",
579			     cipher_name) >= CRYPTO_MAX_ALG_NAME)
580			goto err_free_inst;
581
582		err = crypto_grab_lskcipher(spawn,
583					    lskcipher_crypto_instance(inst),
584					    ecb_name, 0, mask);
585	}
586
587	if (err)
588		goto err_free_inst;
589
590	cipher_alg = crypto_lskcipher_spawn_alg(spawn);
591
592	err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
593				  &cipher_alg->co.base);
594	if (err)
595		goto err_free_inst;
596
597	if (ecb_name[0]) {
598		int len;
599
600		err = -EINVAL;
601		len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4],
602			      sizeof(ecb_name));
603		if (len < 2)
604			goto err_free_inst;
605
606		if (ecb_name[len - 1] != ')')
607			goto err_free_inst;
608
609		ecb_name[len - 1] = 0;
610
611		err = -ENAMETOOLONG;
612		if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME,
613			     "%s(%s)", tmpl->name, ecb_name) >=
614		    CRYPTO_MAX_ALG_NAME)
615			goto err_free_inst;
616
617		if (strcmp(ecb_name, cipher_name) &&
618		    snprintf(inst->alg.co.base.cra_driver_name,
619			     CRYPTO_MAX_ALG_NAME,
620			     "%s(%s)", tmpl->name, cipher_name) >=
621		    CRYPTO_MAX_ALG_NAME)
622			goto err_free_inst;
623	} else {
624		/* Don't allow nesting. */
625		err = -ELOOP;
626		if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE))
627			goto err_free_inst;
628	}
629
630	err = -EINVAL;
631	if (cipher_alg->co.ivsize)
632		goto err_free_inst;
633
634	inst->free = lskcipher_free_instance_simple;
635
636	/* Default algorithm properties, can be overridden */
637	inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize;
638	inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask;
639	inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority;
640	inst->alg.co.min_keysize = cipher_alg->co.min_keysize;
641	inst->alg.co.max_keysize = cipher_alg->co.max_keysize;
642	inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize;
643	inst->alg.co.statesize = cipher_alg->co.statesize;
644
645	/* Use struct crypto_lskcipher * by default, can be overridden */
646	inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *);
647	inst->alg.setkey = lskcipher_setkey_simple;
648	inst->alg.init = lskcipher_init_tfm_simple;
649	inst->alg.exit = lskcipher_exit_tfm_simple;
650
651	return inst;
652
653err_free_inst:
654	lskcipher_free_instance_simple(inst);
655	return ERR_PTR(err);
656}
657EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple);
658