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
18 /*
19 * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
20 */
21 static const u8 rsa_digest_info_md5[] = {
22 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08,
23 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */
24 0x05, 0x00, 0x04, 0x10
25 };
26
27 static const u8 rsa_digest_info_sha1[] = {
28 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
29 0x2b, 0x0e, 0x03, 0x02, 0x1a,
30 0x05, 0x00, 0x04, 0x14
31 };
32
33 static const u8 rsa_digest_info_rmd160[] = {
34 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
35 0x2b, 0x24, 0x03, 0x02, 0x01,
36 0x05, 0x00, 0x04, 0x14
37 };
38
39 static const u8 rsa_digest_info_sha224[] = {
40 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09,
41 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04,
42 0x05, 0x00, 0x04, 0x1c
43 };
44
45 static const u8 rsa_digest_info_sha256[] = {
46 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09,
47 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01,
48 0x05, 0x00, 0x04, 0x20
49 };
50
51 static const u8 rsa_digest_info_sha384[] = {
52 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09,
53 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02,
54 0x05, 0x00, 0x04, 0x30
55 };
56
57 static const u8 rsa_digest_info_sha512[] = {
58 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09,
59 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03,
60 0x05, 0x00, 0x04, 0x40
61 };
62
63 static const struct rsa_asn1_template {
64 const char *name;
65 const u8 *data;
66 size_t size;
67 } rsa_asn1_templates[] = {
68 #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) }
69 _(md5),
70 _(sha1),
71 _(rmd160),
72 _(sha256),
73 _(sha384),
74 _(sha512),
75 _(sha224),
76 { NULL }
77 #undef _
78 };
79
rsa_lookup_asn1(const char * name)80 static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
81 {
82 const struct rsa_asn1_template *p;
83
84 for (p = rsa_asn1_templates; p->name; p++)
85 if (strcmp(name, p->name) == 0)
86 return p;
87 return NULL;
88 }
89
90 struct pkcs1pad_ctx {
91 struct crypto_akcipher *child;
92 unsigned int key_size;
93 };
94
95 struct pkcs1pad_inst_ctx {
96 struct crypto_akcipher_spawn spawn;
97 const struct rsa_asn1_template *digest_info;
98 };
99
100 struct pkcs1pad_request {
101 struct scatterlist in_sg[2], out_sg[1];
102 uint8_t *in_buf, *out_buf;
103 struct akcipher_request child_req;
104 };
105
pkcs1pad_set_pub_key(struct crypto_akcipher * tfm,const void * key,unsigned int keylen)106 static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
107 unsigned int keylen)
108 {
109 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
110 int err;
111
112 ctx->key_size = 0;
113
114 err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
115 if (err)
116 return err;
117
118 /* Find out new modulus size from rsa implementation */
119 err = crypto_akcipher_maxsize(ctx->child);
120 if (err > PAGE_SIZE)
121 return -ENOTSUPP;
122
123 ctx->key_size = err;
124 return 0;
125 }
126
pkcs1pad_set_priv_key(struct crypto_akcipher * tfm,const void * key,unsigned int keylen)127 static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
128 unsigned int keylen)
129 {
130 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
131 int err;
132
133 ctx->key_size = 0;
134
135 err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
136 if (err)
137 return err;
138
139 /* Find out new modulus size from rsa implementation */
140 err = crypto_akcipher_maxsize(ctx->child);
141 if (err > PAGE_SIZE)
142 return -ENOTSUPP;
143
144 ctx->key_size = err;
145 return 0;
146 }
147
pkcs1pad_get_max_size(struct crypto_akcipher * tfm)148 static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
149 {
150 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
151
152 /*
153 * The maximum destination buffer size for the encrypt/sign operations
154 * will be the same as for RSA, even though it's smaller for
155 * decrypt/verify.
156 */
157
158 return ctx->key_size;
159 }
160
pkcs1pad_sg_set_buf(struct scatterlist * sg,void * buf,size_t len,struct scatterlist * next)161 static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
162 struct scatterlist *next)
163 {
164 int nsegs = next ? 2 : 1;
165
166 sg_init_table(sg, nsegs);
167 sg_set_buf(sg, buf, len);
168
169 if (next)
170 sg_chain(sg, nsegs, next);
171 }
172
pkcs1pad_encrypt_sign_complete(struct akcipher_request * req,int err)173 static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
174 {
175 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
176 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
177 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
178 unsigned int pad_len;
179 unsigned int len;
180 u8 *out_buf;
181
182 if (err)
183 goto out;
184
185 len = req_ctx->child_req.dst_len;
186 pad_len = ctx->key_size - len;
187
188 /* Four billion to one */
189 if (likely(!pad_len))
190 goto out;
191
192 out_buf = kzalloc(ctx->key_size, GFP_KERNEL);
193 err = -ENOMEM;
194 if (!out_buf)
195 goto out;
196
197 sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
198 out_buf + pad_len, len);
199 sg_copy_from_buffer(req->dst,
200 sg_nents_for_len(req->dst, ctx->key_size),
201 out_buf, ctx->key_size);
202 kzfree(out_buf);
203
204 out:
205 req->dst_len = ctx->key_size;
206
207 kfree(req_ctx->in_buf);
208
209 return err;
210 }
211
pkcs1pad_encrypt_sign_complete_cb(struct crypto_async_request * child_async_req,int err)212 static void pkcs1pad_encrypt_sign_complete_cb(
213 struct crypto_async_request *child_async_req, int err)
214 {
215 struct akcipher_request *req = child_async_req->data;
216
217 if (err == -EINPROGRESS)
218 goto out;
219
220 err = pkcs1pad_encrypt_sign_complete(req, err);
221
222 out:
223 akcipher_request_complete(req, err);
224 }
225
pkcs1pad_encrypt(struct akcipher_request * req)226 static int pkcs1pad_encrypt(struct akcipher_request *req)
227 {
228 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
229 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
230 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
231 int err;
232 unsigned int i, ps_end;
233
234 if (!ctx->key_size)
235 return -EINVAL;
236
237 if (req->src_len > ctx->key_size - 11)
238 return -EOVERFLOW;
239
240 if (req->dst_len < ctx->key_size) {
241 req->dst_len = ctx->key_size;
242 return -EOVERFLOW;
243 }
244
245 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
246 GFP_KERNEL);
247 if (!req_ctx->in_buf)
248 return -ENOMEM;
249
250 ps_end = ctx->key_size - req->src_len - 2;
251 req_ctx->in_buf[0] = 0x02;
252 for (i = 1; i < ps_end; i++)
253 req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
254 req_ctx->in_buf[ps_end] = 0x00;
255
256 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
257 ctx->key_size - 1 - req->src_len, req->src);
258
259 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
260 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
261 pkcs1pad_encrypt_sign_complete_cb, req);
262
263 /* Reuse output buffer */
264 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
265 req->dst, ctx->key_size - 1, req->dst_len);
266
267 err = crypto_akcipher_encrypt(&req_ctx->child_req);
268 if (err != -EINPROGRESS && err != -EBUSY)
269 return pkcs1pad_encrypt_sign_complete(req, err);
270
271 return err;
272 }
273
pkcs1pad_decrypt_complete(struct akcipher_request * req,int err)274 static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
275 {
276 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
277 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
278 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
279 unsigned int dst_len;
280 unsigned int pos;
281 u8 *out_buf;
282
283 if (err)
284 goto done;
285
286 err = -EINVAL;
287 dst_len = req_ctx->child_req.dst_len;
288 if (dst_len < ctx->key_size - 1)
289 goto done;
290
291 out_buf = req_ctx->out_buf;
292 if (dst_len == ctx->key_size) {
293 if (out_buf[0] != 0x00)
294 /* Decrypted value had no leading 0 byte */
295 goto done;
296
297 dst_len--;
298 out_buf++;
299 }
300
301 if (out_buf[0] != 0x02)
302 goto done;
303
304 for (pos = 1; pos < dst_len; pos++)
305 if (out_buf[pos] == 0x00)
306 break;
307 if (pos < 9 || pos == dst_len)
308 goto done;
309 pos++;
310
311 err = 0;
312
313 if (req->dst_len < dst_len - pos)
314 err = -EOVERFLOW;
315 req->dst_len = dst_len - pos;
316
317 if (!err)
318 sg_copy_from_buffer(req->dst,
319 sg_nents_for_len(req->dst, req->dst_len),
320 out_buf + pos, req->dst_len);
321
322 done:
323 kzfree(req_ctx->out_buf);
324
325 return err;
326 }
327
pkcs1pad_decrypt_complete_cb(struct crypto_async_request * child_async_req,int err)328 static void pkcs1pad_decrypt_complete_cb(
329 struct crypto_async_request *child_async_req, int err)
330 {
331 struct akcipher_request *req = child_async_req->data;
332
333 if (err == -EINPROGRESS)
334 goto out;
335
336 err = pkcs1pad_decrypt_complete(req, err);
337
338 out:
339 akcipher_request_complete(req, err);
340 }
341
pkcs1pad_decrypt(struct akcipher_request * req)342 static int pkcs1pad_decrypt(struct akcipher_request *req)
343 {
344 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
345 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
346 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
347 int err;
348
349 if (!ctx->key_size || req->src_len != ctx->key_size)
350 return -EINVAL;
351
352 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
353 if (!req_ctx->out_buf)
354 return -ENOMEM;
355
356 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
357 ctx->key_size, NULL);
358
359 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
360 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
361 pkcs1pad_decrypt_complete_cb, req);
362
363 /* Reuse input buffer, output to a new buffer */
364 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
365 req_ctx->out_sg, req->src_len,
366 ctx->key_size);
367
368 err = crypto_akcipher_decrypt(&req_ctx->child_req);
369 if (err != -EINPROGRESS && err != -EBUSY)
370 return pkcs1pad_decrypt_complete(req, err);
371
372 return err;
373 }
374
pkcs1pad_sign(struct akcipher_request * req)375 static int pkcs1pad_sign(struct akcipher_request *req)
376 {
377 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
378 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
379 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
380 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
381 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
382 const struct rsa_asn1_template *digest_info = ictx->digest_info;
383 int err;
384 unsigned int ps_end, digest_size = 0;
385
386 if (!ctx->key_size)
387 return -EINVAL;
388
389 if (digest_info)
390 digest_size = digest_info->size;
391
392 if (req->src_len + digest_size > ctx->key_size - 11)
393 return -EOVERFLOW;
394
395 if (req->dst_len < ctx->key_size) {
396 req->dst_len = ctx->key_size;
397 return -EOVERFLOW;
398 }
399
400 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
401 GFP_KERNEL);
402 if (!req_ctx->in_buf)
403 return -ENOMEM;
404
405 ps_end = ctx->key_size - digest_size - req->src_len - 2;
406 req_ctx->in_buf[0] = 0x01;
407 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
408 req_ctx->in_buf[ps_end] = 0x00;
409
410 if (digest_info)
411 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
412 digest_info->size);
413
414 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
415 ctx->key_size - 1 - req->src_len, req->src);
416
417 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
418 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
419 pkcs1pad_encrypt_sign_complete_cb, req);
420
421 /* Reuse output buffer */
422 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
423 req->dst, ctx->key_size - 1, req->dst_len);
424
425 err = crypto_akcipher_decrypt(&req_ctx->child_req);
426 if (err != -EINPROGRESS && err != -EBUSY)
427 return pkcs1pad_encrypt_sign_complete(req, err);
428
429 return err;
430 }
431
pkcs1pad_verify_complete(struct akcipher_request * req,int err)432 static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
433 {
434 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
435 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
436 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
437 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
438 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
439 const struct rsa_asn1_template *digest_info = ictx->digest_info;
440 unsigned int dst_len;
441 unsigned int pos;
442 u8 *out_buf;
443
444 if (err)
445 goto done;
446
447 err = -EINVAL;
448 dst_len = req_ctx->child_req.dst_len;
449 if (dst_len < ctx->key_size - 1)
450 goto done;
451
452 out_buf = req_ctx->out_buf;
453 if (dst_len == ctx->key_size) {
454 if (out_buf[0] != 0x00)
455 /* Decrypted value had no leading 0 byte */
456 goto done;
457
458 dst_len--;
459 out_buf++;
460 }
461
462 err = -EBADMSG;
463 if (out_buf[0] != 0x01)
464 goto done;
465
466 for (pos = 1; pos < dst_len; pos++)
467 if (out_buf[pos] != 0xff)
468 break;
469
470 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
471 goto done;
472 pos++;
473
474 if (digest_info) {
475 if (digest_info->size > dst_len - pos)
476 goto done;
477 if (crypto_memneq(out_buf + pos, digest_info->data,
478 digest_info->size))
479 goto done;
480
481 pos += digest_info->size;
482 }
483
484 err = 0;
485
486 if (req->dst_len != dst_len - pos) {
487 err = -EKEYREJECTED;
488 req->dst_len = dst_len - pos;
489 goto done;
490 }
491 /* Extract appended digest. */
492 sg_pcopy_to_buffer(req->src,
493 sg_nents_for_len(req->src,
494 req->src_len + req->dst_len),
495 req_ctx->out_buf + ctx->key_size,
496 req->dst_len, req->src_len);
497 /* Do the actual verification step. */
498 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos,
499 req->dst_len) != 0)
500 err = -EKEYREJECTED;
501 done:
502 kzfree(req_ctx->out_buf);
503
504 return err;
505 }
506
pkcs1pad_verify_complete_cb(struct crypto_async_request * child_async_req,int err)507 static void pkcs1pad_verify_complete_cb(
508 struct crypto_async_request *child_async_req, int err)
509 {
510 struct akcipher_request *req = child_async_req->data;
511
512 if (err == -EINPROGRESS)
513 goto out;
514
515 err = pkcs1pad_verify_complete(req, err);
516
517 out:
518 akcipher_request_complete(req, err);
519 }
520
521 /*
522 * The verify operation is here for completeness similar to the verification
523 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
524 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
525 * retrieve the DigestInfo from a signature, instead the user is expected
526 * to call the sign operation to generate the expected signature and compare
527 * signatures instead of the message-digests.
528 */
pkcs1pad_verify(struct akcipher_request * req)529 static int pkcs1pad_verify(struct akcipher_request *req)
530 {
531 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
532 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
533 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
534 int err;
535
536 if (WARN_ON(req->dst) ||
537 WARN_ON(!req->dst_len) ||
538 !ctx->key_size || req->src_len != ctx->key_size)
539 return -EINVAL;
540
541 req_ctx->out_buf = kmalloc(ctx->key_size + req->dst_len, GFP_KERNEL);
542 if (!req_ctx->out_buf)
543 return -ENOMEM;
544
545 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
546 ctx->key_size, NULL);
547
548 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
549 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
550 pkcs1pad_verify_complete_cb, req);
551
552 /* Reuse input buffer, output to a new buffer */
553 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
554 req_ctx->out_sg, req->src_len,
555 ctx->key_size);
556
557 err = crypto_akcipher_encrypt(&req_ctx->child_req);
558 if (err != -EINPROGRESS && err != -EBUSY)
559 return pkcs1pad_verify_complete(req, err);
560
561 return err;
562 }
563
pkcs1pad_init_tfm(struct crypto_akcipher * tfm)564 static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
565 {
566 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
567 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
568 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
569 struct crypto_akcipher *child_tfm;
570
571 child_tfm = crypto_spawn_akcipher(&ictx->spawn);
572 if (IS_ERR(child_tfm))
573 return PTR_ERR(child_tfm);
574
575 ctx->child = child_tfm;
576 return 0;
577 }
578
pkcs1pad_exit_tfm(struct crypto_akcipher * tfm)579 static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
580 {
581 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
582
583 crypto_free_akcipher(ctx->child);
584 }
585
pkcs1pad_free(struct akcipher_instance * inst)586 static void pkcs1pad_free(struct akcipher_instance *inst)
587 {
588 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
589 struct crypto_akcipher_spawn *spawn = &ctx->spawn;
590
591 crypto_drop_akcipher(spawn);
592 kfree(inst);
593 }
594
pkcs1pad_create(struct crypto_template * tmpl,struct rtattr ** tb)595 static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
596 {
597 const struct rsa_asn1_template *digest_info;
598 struct crypto_attr_type *algt;
599 struct akcipher_instance *inst;
600 struct pkcs1pad_inst_ctx *ctx;
601 struct crypto_akcipher_spawn *spawn;
602 struct akcipher_alg *rsa_alg;
603 const char *rsa_alg_name;
604 const char *hash_name;
605 int err;
606
607 algt = crypto_get_attr_type(tb);
608 if (IS_ERR(algt))
609 return PTR_ERR(algt);
610
611 if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
612 return -EINVAL;
613
614 rsa_alg_name = crypto_attr_alg_name(tb[1]);
615 if (IS_ERR(rsa_alg_name))
616 return PTR_ERR(rsa_alg_name);
617
618 hash_name = crypto_attr_alg_name(tb[2]);
619 if (IS_ERR(hash_name))
620 hash_name = NULL;
621
622 if (hash_name) {
623 digest_info = rsa_lookup_asn1(hash_name);
624 if (!digest_info)
625 return -EINVAL;
626 } else
627 digest_info = NULL;
628
629 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
630 if (!inst)
631 return -ENOMEM;
632
633 ctx = akcipher_instance_ctx(inst);
634 spawn = &ctx->spawn;
635 ctx->digest_info = digest_info;
636
637 crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
638 err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
639 crypto_requires_sync(algt->type, algt->mask));
640 if (err)
641 goto out_free_inst;
642
643 rsa_alg = crypto_spawn_akcipher_alg(spawn);
644
645 err = -ENAMETOOLONG;
646
647 if (!hash_name) {
648 if (snprintf(inst->alg.base.cra_name,
649 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
650 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
651 goto out_drop_alg;
652
653 if (snprintf(inst->alg.base.cra_driver_name,
654 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
655 rsa_alg->base.cra_driver_name) >=
656 CRYPTO_MAX_ALG_NAME)
657 goto out_drop_alg;
658 } else {
659 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
660 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name,
661 hash_name) >= CRYPTO_MAX_ALG_NAME)
662 goto out_drop_alg;
663
664 if (snprintf(inst->alg.base.cra_driver_name,
665 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
666 rsa_alg->base.cra_driver_name,
667 hash_name) >= CRYPTO_MAX_ALG_NAME)
668 goto out_drop_alg;
669 }
670
671 inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
672 inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
673 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
674
675 inst->alg.init = pkcs1pad_init_tfm;
676 inst->alg.exit = pkcs1pad_exit_tfm;
677
678 inst->alg.encrypt = pkcs1pad_encrypt;
679 inst->alg.decrypt = pkcs1pad_decrypt;
680 inst->alg.sign = pkcs1pad_sign;
681 inst->alg.verify = pkcs1pad_verify;
682 inst->alg.set_pub_key = pkcs1pad_set_pub_key;
683 inst->alg.set_priv_key = pkcs1pad_set_priv_key;
684 inst->alg.max_size = pkcs1pad_get_max_size;
685 inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize;
686
687 inst->free = pkcs1pad_free;
688
689 err = akcipher_register_instance(tmpl, inst);
690 if (err)
691 goto out_drop_alg;
692
693 return 0;
694
695 out_drop_alg:
696 crypto_drop_akcipher(spawn);
697 out_free_inst:
698 kfree(inst);
699 return err;
700 }
701
702 struct crypto_template rsa_pkcs1pad_tmpl = {
703 .name = "pkcs1pad",
704 .create = pkcs1pad_create,
705 .module = THIS_MODULE,
706 };
707