ocfs2: improve ocfs2 Makefile
[linux/fpc-iii.git] / crypto / rsa-pkcs1pad.c
blobcfc04e15fd97506a6110c5845673db731a0cf757
1 /*
2 * RSA padding templates.
4 * Copyright (c) 2015 Intel Corporation
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
12 #include <crypto/algapi.h>
13 #include <crypto/akcipher.h>
14 #include <crypto/internal/akcipher.h>
15 #include <linux/err.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/random.h>
22 * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
24 static const u8 rsa_digest_info_md5[] = {
25 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
26 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */
27 0x05, 0x00, 0x04, 0x10
30 static const u8 rsa_digest_info_sha1[] = {
31 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
32 0x2b, 0x0e, 0x03, 0x02, 0x1a,
33 0x05, 0x00, 0x04, 0x14
36 static const u8 rsa_digest_info_rmd160[] = {
37 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
38 0x2b, 0x24, 0x03, 0x02, 0x01,
39 0x05, 0x00, 0x04, 0x14
42 static const u8 rsa_digest_info_sha224[] = {
43 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
44 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
45 0x05, 0x00, 0x04, 0x1c
48 static const u8 rsa_digest_info_sha256[] = {
49 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
50 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
51 0x05, 0x00, 0x04, 0x20
54 static const u8 rsa_digest_info_sha384[] = {
55 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
56 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
57 0x05, 0x00, 0x04, 0x30
60 static const u8 rsa_digest_info_sha512[] = {
61 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
62 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
63 0x05, 0x00, 0x04, 0x40
66 static const struct rsa_asn1_template {
67 const char *name;
68 const u8 *data;
69 size_t size;
70 } rsa_asn1_templates[] = {
71 #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
72 _(md5),
73 _(sha1),
74 _(rmd160),
75 _(sha256),
76 _(sha384),
77 _(sha512),
78 _(sha224),
79 { NULL }
80 #undef _
83 static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
85 const struct rsa_asn1_template *p;
87 for (p = rsa_asn1_templates; p->name; p++)
88 if (strcmp(name, p->name) == 0)
89 return p;
90 return NULL;
93 struct pkcs1pad_ctx {
94 struct crypto_akcipher *child;
95 unsigned int key_size;
98 struct pkcs1pad_inst_ctx {
99 struct crypto_akcipher_spawn spawn;
100 const struct rsa_asn1_template *digest_info;
103 struct pkcs1pad_request {
104 struct scatterlist in_sg[2], out_sg[1];
105 uint8_t *in_buf, *out_buf;
106 struct akcipher_request child_req;
109 static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
110 unsigned int keylen)
112 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
113 int err;
115 ctx->key_size = 0;
117 err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
118 if (err)
119 return err;
121 /* Find out new modulus size from rsa implementation */
122 err = crypto_akcipher_maxsize(ctx->child);
123 if (err > PAGE_SIZE)
124 return -ENOTSUPP;
126 ctx->key_size = err;
127 return 0;
130 static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
131 unsigned int keylen)
133 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
134 int err;
136 ctx->key_size = 0;
138 err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
139 if (err)
140 return err;
142 /* Find out new modulus size from rsa implementation */
143 err = crypto_akcipher_maxsize(ctx->child);
144 if (err > PAGE_SIZE)
145 return -ENOTSUPP;
147 ctx->key_size = err;
148 return 0;
151 static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
153 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
156 * The maximum destination buffer size for the encrypt/sign operations
157 * will be the same as for RSA, even though it's smaller for
158 * decrypt/verify.
161 return ctx->key_size;
164 static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
165 struct scatterlist *next)
167 int nsegs = next ? 2 : 1;
169 sg_init_table(sg, nsegs);
170 sg_set_buf(sg, buf, len);
172 if (next)
173 sg_chain(sg, nsegs, next);
176 static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
178 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
179 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
180 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
181 unsigned int pad_len;
182 unsigned int len;
183 u8 *out_buf;
185 if (err)
186 goto out;
188 len = req_ctx->child_req.dst_len;
189 pad_len = ctx->key_size - len;
191 /* Four billion to one */
192 if (likely(!pad_len))
193 goto out;
195 out_buf = kzalloc(ctx->key_size, GFP_KERNEL);
196 err = -ENOMEM;
197 if (!out_buf)
198 goto out;
200 sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
201 out_buf + pad_len, len);
202 sg_copy_from_buffer(req->dst,
203 sg_nents_for_len(req->dst, ctx->key_size),
204 out_buf, ctx->key_size);
205 kzfree(out_buf);
207 out:
208 req->dst_len = ctx->key_size;
210 kfree(req_ctx->in_buf);
212 return err;
215 static void pkcs1pad_encrypt_sign_complete_cb(
216 struct crypto_async_request *child_async_req, int err)
218 struct akcipher_request *req = child_async_req->data;
219 struct crypto_async_request async_req;
221 if (err == -EINPROGRESS)
222 return;
224 async_req.data = req->base.data;
225 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
226 async_req.flags = child_async_req->flags;
227 req->base.complete(&async_req,
228 pkcs1pad_encrypt_sign_complete(req, err));
231 static int pkcs1pad_encrypt(struct akcipher_request *req)
233 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
234 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
235 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
236 int err;
237 unsigned int i, ps_end;
239 if (!ctx->key_size)
240 return -EINVAL;
242 if (req->src_len > ctx->key_size - 11)
243 return -EOVERFLOW;
245 if (req->dst_len < ctx->key_size) {
246 req->dst_len = ctx->key_size;
247 return -EOVERFLOW;
250 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
251 GFP_KERNEL);
252 if (!req_ctx->in_buf)
253 return -ENOMEM;
255 ps_end = ctx->key_size - req->src_len - 2;
256 req_ctx->in_buf[0] = 0x02;
257 for (i = 1; i < ps_end; i++)
258 req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
259 req_ctx->in_buf[ps_end] = 0x00;
261 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
262 ctx->key_size - 1 - req->src_len, req->src);
264 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
265 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
266 pkcs1pad_encrypt_sign_complete_cb, req);
268 /* Reuse output buffer */
269 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
270 req->dst, ctx->key_size - 1, req->dst_len);
272 err = crypto_akcipher_encrypt(&req_ctx->child_req);
273 if (err != -EINPROGRESS && err != -EBUSY)
274 return pkcs1pad_encrypt_sign_complete(req, err);
276 return err;
279 static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
281 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
282 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
283 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
284 unsigned int dst_len;
285 unsigned int pos;
286 u8 *out_buf;
288 if (err)
289 goto done;
291 err = -EINVAL;
292 dst_len = req_ctx->child_req.dst_len;
293 if (dst_len < ctx->key_size - 1)
294 goto done;
296 out_buf = req_ctx->out_buf;
297 if (dst_len == ctx->key_size) {
298 if (out_buf[0] != 0x00)
299 /* Decrypted value had no leading 0 byte */
300 goto done;
302 dst_len--;
303 out_buf++;
306 if (out_buf[0] != 0x02)
307 goto done;
309 for (pos = 1; pos < dst_len; pos++)
310 if (out_buf[pos] == 0x00)
311 break;
312 if (pos < 9 || pos == dst_len)
313 goto done;
314 pos++;
316 err = 0;
318 if (req->dst_len < dst_len - pos)
319 err = -EOVERFLOW;
320 req->dst_len = dst_len - pos;
322 if (!err)
323 sg_copy_from_buffer(req->dst,
324 sg_nents_for_len(req->dst, req->dst_len),
325 out_buf + pos, req->dst_len);
327 done:
328 kzfree(req_ctx->out_buf);
330 return err;
333 static void pkcs1pad_decrypt_complete_cb(
334 struct crypto_async_request *child_async_req, int err)
336 struct akcipher_request *req = child_async_req->data;
337 struct crypto_async_request async_req;
339 if (err == -EINPROGRESS)
340 return;
342 async_req.data = req->base.data;
343 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
344 async_req.flags = child_async_req->flags;
345 req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err));
348 static int pkcs1pad_decrypt(struct akcipher_request *req)
350 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
351 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
352 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
353 int err;
355 if (!ctx->key_size || req->src_len != ctx->key_size)
356 return -EINVAL;
358 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
359 if (!req_ctx->out_buf)
360 return -ENOMEM;
362 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
363 ctx->key_size, NULL);
365 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
366 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
367 pkcs1pad_decrypt_complete_cb, req);
369 /* Reuse input buffer, output to a new buffer */
370 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
371 req_ctx->out_sg, req->src_len,
372 ctx->key_size);
374 err = crypto_akcipher_decrypt(&req_ctx->child_req);
375 if (err != -EINPROGRESS && err != -EBUSY)
376 return pkcs1pad_decrypt_complete(req, err);
378 return err;
381 static int pkcs1pad_sign(struct akcipher_request *req)
383 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
384 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
385 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
386 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
387 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
388 const struct rsa_asn1_template *digest_info = ictx->digest_info;
389 int err;
390 unsigned int ps_end, digest_size = 0;
392 if (!ctx->key_size)
393 return -EINVAL;
395 if (digest_info)
396 digest_size = digest_info->size;
398 if (req->src_len + digest_size > ctx->key_size - 11)
399 return -EOVERFLOW;
401 if (req->dst_len < ctx->key_size) {
402 req->dst_len = ctx->key_size;
403 return -EOVERFLOW;
406 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
407 GFP_KERNEL);
408 if (!req_ctx->in_buf)
409 return -ENOMEM;
411 ps_end = ctx->key_size - digest_size - req->src_len - 2;
412 req_ctx->in_buf[0] = 0x01;
413 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
414 req_ctx->in_buf[ps_end] = 0x00;
416 if (digest_info)
417 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
418 digest_info->size);
420 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
421 ctx->key_size - 1 - req->src_len, req->src);
423 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
424 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
425 pkcs1pad_encrypt_sign_complete_cb, req);
427 /* Reuse output buffer */
428 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
429 req->dst, ctx->key_size - 1, req->dst_len);
431 err = crypto_akcipher_sign(&req_ctx->child_req);
432 if (err != -EINPROGRESS && err != -EBUSY)
433 return pkcs1pad_encrypt_sign_complete(req, err);
435 return err;
438 static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
440 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
441 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
442 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
443 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
444 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
445 const struct rsa_asn1_template *digest_info = ictx->digest_info;
446 unsigned int dst_len;
447 unsigned int pos;
448 u8 *out_buf;
450 if (err)
451 goto done;
453 err = -EINVAL;
454 dst_len = req_ctx->child_req.dst_len;
455 if (dst_len < ctx->key_size - 1)
456 goto done;
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;
464 dst_len--;
465 out_buf++;
468 err = -EBADMSG;
469 if (out_buf[0] != 0x01)
470 goto done;
472 for (pos = 1; pos < dst_len; pos++)
473 if (out_buf[pos] != 0xff)
474 break;
476 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
477 goto done;
478 pos++;
480 if (digest_info) {
481 if (crypto_memneq(out_buf + pos, digest_info->data,
482 digest_info->size))
483 goto done;
485 pos += digest_info->size;
488 err = 0;
490 if (req->dst_len < dst_len - pos)
491 err = -EOVERFLOW;
492 req->dst_len = dst_len - pos;
494 if (!err)
495 sg_copy_from_buffer(req->dst,
496 sg_nents_for_len(req->dst, req->dst_len),
497 out_buf + pos, req->dst_len);
498 done:
499 kzfree(req_ctx->out_buf);
501 return err;
504 static void pkcs1pad_verify_complete_cb(
505 struct crypto_async_request *child_async_req, int err)
507 struct akcipher_request *req = child_async_req->data;
508 struct crypto_async_request async_req;
510 if (err == -EINPROGRESS)
511 return;
513 async_req.data = req->base.data;
514 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
515 async_req.flags = child_async_req->flags;
516 req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
520 * The verify operation is here for completeness similar to the verification
521 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
522 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
523 * retrieve the DigestInfo from a signature, instead the user is expected
524 * to call the sign operation to generate the expected signature and compare
525 * signatures instead of the message-digests.
527 static int pkcs1pad_verify(struct akcipher_request *req)
529 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
530 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
531 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
532 int err;
534 if (!ctx->key_size || req->src_len < ctx->key_size)
535 return -EINVAL;
537 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
538 if (!req_ctx->out_buf)
539 return -ENOMEM;
541 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
542 ctx->key_size, NULL);
544 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
545 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
546 pkcs1pad_verify_complete_cb, req);
548 /* Reuse input buffer, output to a new buffer */
549 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
550 req_ctx->out_sg, req->src_len,
551 ctx->key_size);
553 err = crypto_akcipher_verify(&req_ctx->child_req);
554 if (err != -EINPROGRESS && err != -EBUSY)
555 return pkcs1pad_verify_complete(req, err);
557 return err;
560 static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
562 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
563 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
564 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
565 struct crypto_akcipher *child_tfm;
567 child_tfm = crypto_spawn_akcipher(&ictx->spawn);
568 if (IS_ERR(child_tfm))
569 return PTR_ERR(child_tfm);
571 ctx->child = child_tfm;
572 return 0;
575 static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
577 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
579 crypto_free_akcipher(ctx->child);
582 static void pkcs1pad_free(struct akcipher_instance *inst)
584 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
585 struct crypto_akcipher_spawn *spawn = &ctx->spawn;
587 crypto_drop_akcipher(spawn);
588 kfree(inst);
591 static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
593 const struct rsa_asn1_template *digest_info;
594 struct crypto_attr_type *algt;
595 struct akcipher_instance *inst;
596 struct pkcs1pad_inst_ctx *ctx;
597 struct crypto_akcipher_spawn *spawn;
598 struct akcipher_alg *rsa_alg;
599 const char *rsa_alg_name;
600 const char *hash_name;
601 int err;
603 algt = crypto_get_attr_type(tb);
604 if (IS_ERR(algt))
605 return PTR_ERR(algt);
607 if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
608 return -EINVAL;
610 rsa_alg_name = crypto_attr_alg_name(tb[1]);
611 if (IS_ERR(rsa_alg_name))
612 return PTR_ERR(rsa_alg_name);
614 hash_name = crypto_attr_alg_name(tb[2]);
615 if (IS_ERR(hash_name))
616 hash_name = NULL;
618 if (hash_name) {
619 digest_info = rsa_lookup_asn1(hash_name);
620 if (!digest_info)
621 return -EINVAL;
622 } else
623 digest_info = NULL;
625 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
626 if (!inst)
627 return -ENOMEM;
629 ctx = akcipher_instance_ctx(inst);
630 spawn = &ctx->spawn;
631 ctx->digest_info = digest_info;
633 crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
634 err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
635 crypto_requires_sync(algt->type, algt->mask));
636 if (err)
637 goto out_free_inst;
639 rsa_alg = crypto_spawn_akcipher_alg(spawn);
641 err = -ENAMETOOLONG;
643 if (!hash_name) {
644 if (snprintf(inst->alg.base.cra_name,
645 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
646 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
647 goto out_drop_alg;
649 if (snprintf(inst->alg.base.cra_driver_name,
650 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
651 rsa_alg->base.cra_driver_name) >=
652 CRYPTO_MAX_ALG_NAME)
653 goto out_drop_alg;
654 } else {
655 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
656 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name,
657 hash_name) >= CRYPTO_MAX_ALG_NAME)
658 goto out_drop_alg;
660 if (snprintf(inst->alg.base.cra_driver_name,
661 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
662 rsa_alg->base.cra_driver_name,
663 hash_name) >= CRYPTO_MAX_ALG_NAME)
664 goto out_drop_alg;
667 inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
668 inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
669 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
671 inst->alg.init = pkcs1pad_init_tfm;
672 inst->alg.exit = pkcs1pad_exit_tfm;
674 inst->alg.encrypt = pkcs1pad_encrypt;
675 inst->alg.decrypt = pkcs1pad_decrypt;
676 inst->alg.sign = pkcs1pad_sign;
677 inst->alg.verify = pkcs1pad_verify;
678 inst->alg.set_pub_key = pkcs1pad_set_pub_key;
679 inst->alg.set_priv_key = pkcs1pad_set_priv_key;
680 inst->alg.max_size = pkcs1pad_get_max_size;
681 inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize;
683 inst->free = pkcs1pad_free;
685 err = akcipher_register_instance(tmpl, inst);
686 if (err)
687 goto out_drop_alg;
689 return 0;
691 out_drop_alg:
692 crypto_drop_akcipher(spawn);
693 out_free_inst:
694 kfree(inst);
695 return err;
698 struct crypto_template rsa_pkcs1pad_tmpl = {
699 .name = "pkcs1pad",
700 .create = pkcs1pad_create,
701 .module = THIS_MODULE,