1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * RSA padding templates.
4 *
5 * Copyright (c) 2015  Intel Corporation
6 */
7
8#include <crypto/algapi.h>
9#include <crypto/akcipher.h>
10#include <crypto/internal/akcipher.h>
11#include <crypto/internal/rsa.h>
12#include <linux/err.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/scatterlist.h>
18
19/*
20 * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
21 */
22static const u8 rsa_digest_info_md5[] = {
23	0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
24	0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */
25	0x05, 0x00, 0x04, 0x10
26};
27
28static const u8 rsa_digest_info_sha1[] = {
29	0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
30	0x2b, 0x0e, 0x03, 0x02, 0x1a,
31	0x05, 0x00, 0x04, 0x14
32};
33
34static const u8 rsa_digest_info_rmd160[] = {
35	0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
36	0x2b, 0x24, 0x03, 0x02, 0x01,
37	0x05, 0x00, 0x04, 0x14
38};
39
40static const u8 rsa_digest_info_sha224[] = {
41	0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
42	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
43	0x05, 0x00, 0x04, 0x1c
44};
45
46static const u8 rsa_digest_info_sha256[] = {
47	0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
48	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
49	0x05, 0x00, 0x04, 0x20
50};
51
52static const u8 rsa_digest_info_sha384[] = {
53	0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
54	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
55	0x05, 0x00, 0x04, 0x30
56};
57
58static const u8 rsa_digest_info_sha512[] = {
59	0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
60	0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
61	0x05, 0x00, 0x04, 0x40
62};
63
64static const struct rsa_asn1_template {
65	const char	*name;
66	const u8	*data;
67	size_t		size;
68} rsa_asn1_templates[] = {
69#define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
70	_(md5),
71	_(sha1),
72	_(rmd160),
73	_(sha256),
74	_(sha384),
75	_(sha512),
76	_(sha224),
77	{ NULL }
78#undef _
79};
80
81static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
82{
83	const struct rsa_asn1_template *p;
84
85	for (p = rsa_asn1_templates; p->name; p++)
86		if (strcmp(name, p->name) == 0)
87			return p;
88	return NULL;
89}
90
91struct pkcs1pad_ctx {
92	struct crypto_akcipher *child;
93	unsigned int key_size;
94};
95
96struct pkcs1pad_inst_ctx {
97	struct crypto_akcipher_spawn spawn;
98	const struct rsa_asn1_template *digest_info;
99};
100
101struct pkcs1pad_request {
102	struct scatterlist in_sg[2], out_sg[1];
103	uint8_t *in_buf, *out_buf;
104	struct akcipher_request child_req;
105};
106
107static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
108		unsigned int keylen)
109{
110	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
111	int err;
112
113	ctx->key_size = 0;
114
115	err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
116	if (err)
117		return err;
118
119	/* Find out new modulus size from rsa implementation */
120	err = crypto_akcipher_maxsize(ctx->child);
121	if (err > PAGE_SIZE)
122		return -ENOTSUPP;
123
124	ctx->key_size = err;
125	return 0;
126}
127
128static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
129		unsigned int keylen)
130{
131	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
132	int err;
133
134	ctx->key_size = 0;
135
136	err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
137	if (err)
138		return err;
139
140	/* Find out new modulus size from rsa implementation */
141	err = crypto_akcipher_maxsize(ctx->child);
142	if (err > PAGE_SIZE)
143		return -ENOTSUPP;
144
145	ctx->key_size = err;
146	return 0;
147}
148
149static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
150{
151	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
152
153	/*
154	 * The maximum destination buffer size for the encrypt/sign operations
155	 * will be the same as for RSA, even though it's smaller for
156	 * decrypt/verify.
157	 */
158
159	return ctx->key_size;
160}
161
162static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
163		struct scatterlist *next)
164{
165	int nsegs = next ? 2 : 1;
166
167	sg_init_table(sg, nsegs);
168	sg_set_buf(sg, buf, len);
169
170	if (next)
171		sg_chain(sg, nsegs, next);
172}
173
174static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
175{
176	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
177	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
178	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
179	unsigned int pad_len;
180	unsigned int len;
181	u8 *out_buf;
182
183	if (err)
184		goto out;
185
186	len = req_ctx->child_req.dst_len;
187	pad_len = ctx->key_size - len;
188
189	/* Four billion to one */
190	if (likely(!pad_len))
191		goto out;
192
193	out_buf = kzalloc(ctx->key_size, GFP_KERNEL);
194	err = -ENOMEM;
195	if (!out_buf)
196		goto out;
197
198	sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
199			  out_buf + pad_len, len);
200	sg_copy_from_buffer(req->dst,
201			    sg_nents_for_len(req->dst, ctx->key_size),
202			    out_buf, ctx->key_size);
203	kfree_sensitive(out_buf);
204
205out:
206	req->dst_len = ctx->key_size;
207
208	kfree(req_ctx->in_buf);
209
210	return err;
211}
212
213static void pkcs1pad_encrypt_sign_complete_cb(
214		struct crypto_async_request *child_async_req, int err)
215{
216	struct akcipher_request *req = child_async_req->data;
217	struct crypto_async_request async_req;
218
219	if (err == -EINPROGRESS)
220		return;
221
222	async_req.data = req->base.data;
223	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
224	async_req.flags = child_async_req->flags;
225	req->base.complete(&async_req,
226			pkcs1pad_encrypt_sign_complete(req, err));
227}
228
229static int pkcs1pad_encrypt(struct akcipher_request *req)
230{
231	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
232	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
233	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
234	int err;
235	unsigned int i, ps_end;
236
237	if (!ctx->key_size)
238		return -EINVAL;
239
240	if (req->src_len > ctx->key_size - 11)
241		return -EOVERFLOW;
242
243	if (req->dst_len < ctx->key_size) {
244		req->dst_len = ctx->key_size;
245		return -EOVERFLOW;
246	}
247
248	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
249				  GFP_KERNEL);
250	if (!req_ctx->in_buf)
251		return -ENOMEM;
252
253	ps_end = ctx->key_size - req->src_len - 2;
254	req_ctx->in_buf[0] = 0x02;
255	for (i = 1; i < ps_end; i++)
256		req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
257	req_ctx->in_buf[ps_end] = 0x00;
258
259	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
260			ctx->key_size - 1 - req->src_len, req->src);
261
262	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
263	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
264			pkcs1pad_encrypt_sign_complete_cb, req);
265
266	/* Reuse output buffer */
267	akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
268				   req->dst, ctx->key_size - 1, req->dst_len);
269
270	err = crypto_akcipher_encrypt(&req_ctx->child_req);
271	if (err != -EINPROGRESS && err != -EBUSY)
272		return pkcs1pad_encrypt_sign_complete(req, err);
273
274	return err;
275}
276
277static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
278{
279	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
280	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
281	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
282	unsigned int dst_len;
283	unsigned int pos;
284	u8 *out_buf;
285
286	if (err)
287		goto done;
288
289	err = -EINVAL;
290	dst_len = req_ctx->child_req.dst_len;
291	if (dst_len < ctx->key_size - 1)
292		goto done;
293
294	out_buf = req_ctx->out_buf;
295	if (dst_len == ctx->key_size) {
296		if (out_buf[0] != 0x00)
297			/* Decrypted value had no leading 0 byte */
298			goto done;
299
300		dst_len--;
301		out_buf++;
302	}
303
304	if (out_buf[0] != 0x02)
305		goto done;
306
307	for (pos = 1; pos < dst_len; pos++)
308		if (out_buf[pos] == 0x00)
309			break;
310	if (pos < 9 || pos == dst_len)
311		goto done;
312	pos++;
313
314	err = 0;
315
316	if (req->dst_len < dst_len - pos)
317		err = -EOVERFLOW;
318	req->dst_len = dst_len - pos;
319
320	if (!err)
321		sg_copy_from_buffer(req->dst,
322				sg_nents_for_len(req->dst, req->dst_len),
323				out_buf + pos, req->dst_len);
324
325done:
326	kfree_sensitive(req_ctx->out_buf);
327
328	return err;
329}
330
331static void pkcs1pad_decrypt_complete_cb(
332		struct crypto_async_request *child_async_req, int err)
333{
334	struct akcipher_request *req = child_async_req->data;
335	struct crypto_async_request async_req;
336
337	if (err == -EINPROGRESS)
338		return;
339
340	async_req.data = req->base.data;
341	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
342	async_req.flags = child_async_req->flags;
343	req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err));
344}
345
346static int pkcs1pad_decrypt(struct akcipher_request *req)
347{
348	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
349	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
350	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
351	int err;
352
353	if (!ctx->key_size || req->src_len != ctx->key_size)
354		return -EINVAL;
355
356	req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
357	if (!req_ctx->out_buf)
358		return -ENOMEM;
359
360	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
361			    ctx->key_size, NULL);
362
363	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
364	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
365			pkcs1pad_decrypt_complete_cb, req);
366
367	/* Reuse input buffer, output to a new buffer */
368	akcipher_request_set_crypt(&req_ctx->child_req, req->src,
369				   req_ctx->out_sg, req->src_len,
370				   ctx->key_size);
371
372	err = crypto_akcipher_decrypt(&req_ctx->child_req);
373	if (err != -EINPROGRESS && err != -EBUSY)
374		return pkcs1pad_decrypt_complete(req, err);
375
376	return err;
377}
378
379static int pkcs1pad_sign(struct akcipher_request *req)
380{
381	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
382	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
383	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
384	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
385	struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
386	const struct rsa_asn1_template *digest_info = ictx->digest_info;
387	int err;
388	unsigned int ps_end, digest_info_size = 0;
389
390	if (!ctx->key_size)
391		return -EINVAL;
392
393	if (digest_info)
394		digest_info_size = digest_info->size;
395
396	if (req->src_len + digest_info_size > ctx->key_size - 11)
397		return -EOVERFLOW;
398
399	if (req->dst_len < ctx->key_size) {
400		req->dst_len = ctx->key_size;
401		return -EOVERFLOW;
402	}
403
404	req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
405				  GFP_KERNEL);
406	if (!req_ctx->in_buf)
407		return -ENOMEM;
408
409	ps_end = ctx->key_size - digest_info_size - req->src_len - 2;
410	req_ctx->in_buf[0] = 0x01;
411	memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
412	req_ctx->in_buf[ps_end] = 0x00;
413
414	if (digest_info)
415		memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
416		       digest_info->size);
417
418	pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
419			ctx->key_size - 1 - req->src_len, req->src);
420
421	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
422	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
423			pkcs1pad_encrypt_sign_complete_cb, req);
424
425	/* Reuse output buffer */
426	akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
427				   req->dst, ctx->key_size - 1, req->dst_len);
428
429	err = crypto_akcipher_decrypt(&req_ctx->child_req);
430	if (err != -EINPROGRESS && err != -EBUSY)
431		return pkcs1pad_encrypt_sign_complete(req, err);
432
433	return err;
434}
435
436static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
437{
438	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
439	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
440	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
441	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
442	struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
443	const struct rsa_asn1_template *digest_info = ictx->digest_info;
444	const unsigned int sig_size = req->src_len;
445	const unsigned int digest_size = req->dst_len;
446	unsigned int dst_len;
447	unsigned int pos;
448	u8 *out_buf;
449
450	if (err)
451		goto done;
452
453	err = -EINVAL;
454	dst_len = req_ctx->child_req.dst_len;
455	if (dst_len < ctx->key_size - 1)
456		goto done;
457
458	out_buf = req_ctx->out_buf;
459	if (dst_len == ctx->key_size) {
460		if (out_buf[0] != 0x00)
461			/* Decrypted value had no leading 0 byte */
462			goto done;
463
464		dst_len--;
465		out_buf++;
466	}
467
468	err = -EBADMSG;
469	if (out_buf[0] != 0x01)
470		goto done;
471
472	for (pos = 1; pos < dst_len; pos++)
473		if (out_buf[pos] != 0xff)
474			break;
475
476	if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
477		goto done;
478	pos++;
479
480	if (digest_info) {
481		if (digest_info->size > dst_len - pos)
482			goto done;
483		if (crypto_memneq(out_buf + pos, digest_info->data,
484				  digest_info->size))
485			goto done;
486
487		pos += digest_info->size;
488	}
489
490	err = 0;
491
492	if (digest_size != dst_len - pos) {
493		err = -EKEYREJECTED;
494		req->dst_len = dst_len - pos;
495		goto done;
496	}
497	/* Extract appended digest. */
498	sg_pcopy_to_buffer(req->src,
499			   sg_nents_for_len(req->src, sig_size + digest_size),
500			   req_ctx->out_buf + ctx->key_size,
501			   digest_size, sig_size);
502	/* Do the actual verification step. */
503	if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos,
504		   digest_size) != 0)
505		err = -EKEYREJECTED;
506done:
507	kfree_sensitive(req_ctx->out_buf);
508
509	return err;
510}
511
512static void pkcs1pad_verify_complete_cb(
513		struct crypto_async_request *child_async_req, int err)
514{
515	struct akcipher_request *req = child_async_req->data;
516	struct crypto_async_request async_req;
517
518	if (err == -EINPROGRESS)
519		return;
520
521	async_req.data = req->base.data;
522	async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
523	async_req.flags = child_async_req->flags;
524	req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
525}
526
527/*
528 * The verify operation is here for completeness similar to the verification
529 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
530 * as in RFC2437.  RFC2437 section 9.2 doesn't define any operation to
531 * retrieve the DigestInfo from a signature, instead the user is expected
532 * to call the sign operation to generate the expected signature and compare
533 * signatures instead of the message-digests.
534 */
535static int pkcs1pad_verify(struct akcipher_request *req)
536{
537	struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
538	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
539	struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
540	const unsigned int sig_size = req->src_len;
541	const unsigned int digest_size = req->dst_len;
542	int err;
543
544	if (WARN_ON(req->dst) || WARN_ON(!digest_size) ||
545	    !ctx->key_size || sig_size != ctx->key_size)
546		return -EINVAL;
547
548	req_ctx->out_buf = kmalloc(ctx->key_size + digest_size, GFP_KERNEL);
549	if (!req_ctx->out_buf)
550		return -ENOMEM;
551
552	pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
553			    ctx->key_size, NULL);
554
555	akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
556	akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
557			pkcs1pad_verify_complete_cb, req);
558
559	/* Reuse input buffer, output to a new buffer */
560	akcipher_request_set_crypt(&req_ctx->child_req, req->src,
561				   req_ctx->out_sg, sig_size, ctx->key_size);
562
563	err = crypto_akcipher_encrypt(&req_ctx->child_req);
564	if (err != -EINPROGRESS && err != -EBUSY)
565		return pkcs1pad_verify_complete(req, err);
566
567	return err;
568}
569
570static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
571{
572	struct akcipher_instance *inst = akcipher_alg_instance(tfm);
573	struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
574	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
575	struct crypto_akcipher *child_tfm;
576
577	child_tfm = crypto_spawn_akcipher(&ictx->spawn);
578	if (IS_ERR(child_tfm))
579		return PTR_ERR(child_tfm);
580
581	ctx->child = child_tfm;
582	return 0;
583}
584
585static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
586{
587	struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
588
589	crypto_free_akcipher(ctx->child);
590}
591
592static void pkcs1pad_free(struct akcipher_instance *inst)
593{
594	struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
595	struct crypto_akcipher_spawn *spawn = &ctx->spawn;
596
597	crypto_drop_akcipher(spawn);
598	kfree(inst);
599}
600
601static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
602{
603	u32 mask;
604	struct akcipher_instance *inst;
605	struct pkcs1pad_inst_ctx *ctx;
606	struct akcipher_alg *rsa_alg;
607	const char *hash_name;
608	int err;
609
610	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask);
611	if (err)
612		return err;
613
614	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
615	if (!inst)
616		return -ENOMEM;
617
618	ctx = akcipher_instance_ctx(inst);
619
620	err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),
621				   crypto_attr_alg_name(tb[1]), 0, mask);
622	if (err)
623		goto err_free_inst;
624
625	rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
626
627	if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) {
628		err = -EINVAL;
629		goto err_free_inst;
630	}
631
632	err = -ENAMETOOLONG;
633	hash_name = crypto_attr_alg_name(tb[2]);
634	if (IS_ERR(hash_name)) {
635		if (snprintf(inst->alg.base.cra_name,
636			     CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
637			     rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
638			goto err_free_inst;
639
640		if (snprintf(inst->alg.base.cra_driver_name,
641			     CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
642			     rsa_alg->base.cra_driver_name) >=
643			     CRYPTO_MAX_ALG_NAME)
644			goto err_free_inst;
645	} else {
646		ctx->digest_info = rsa_lookup_asn1(hash_name);
647		if (!ctx->digest_info) {
648			err = -EINVAL;
649			goto err_free_inst;
650		}
651
652		if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
653			     "pkcs1pad(%s,%s)", rsa_alg->base.cra_name,
654			     hash_name) >= CRYPTO_MAX_ALG_NAME)
655			goto err_free_inst;
656
657		if (snprintf(inst->alg.base.cra_driver_name,
658			     CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
659			     rsa_alg->base.cra_driver_name,
660			     hash_name) >= CRYPTO_MAX_ALG_NAME)
661			goto err_free_inst;
662	}
663
664	inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
665	inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
666
667	inst->alg.init = pkcs1pad_init_tfm;
668	inst->alg.exit = pkcs1pad_exit_tfm;
669
670	inst->alg.encrypt = pkcs1pad_encrypt;
671	inst->alg.decrypt = pkcs1pad_decrypt;
672	inst->alg.sign = pkcs1pad_sign;
673	inst->alg.verify = pkcs1pad_verify;
674	inst->alg.set_pub_key = pkcs1pad_set_pub_key;
675	inst->alg.set_priv_key = pkcs1pad_set_priv_key;
676	inst->alg.max_size = pkcs1pad_get_max_size;
677	inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize;
678
679	inst->free = pkcs1pad_free;
680
681	err = akcipher_register_instance(tmpl, inst);
682	if (err) {
683err_free_inst:
684		pkcs1pad_free(inst);
685	}
686	return err;
687}
688
689struct crypto_template rsa_pkcs1pad_tmpl = {
690	.name = "pkcs1pad",
691	.create = pkcs1pad_create,
692	.module = THIS_MODULE,
693};
694