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 */
22 static 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
28 static 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
34 static 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
40 static 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
46 static 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
52 static 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
58 static 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
64 static 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
rsa_lookup_asn1(const char * name)81 static 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
91 struct pkcs1pad_ctx {
92 struct crypto_akcipher *child;
93 unsigned int key_size;
94 };
95
96 struct pkcs1pad_inst_ctx {
97 struct crypto_akcipher_spawn spawn;
98 const struct rsa_asn1_template *digest_info;
99 };
100
101 struct 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
pkcs1pad_set_pub_key(struct crypto_akcipher * tfm,const void * key,unsigned int keylen)107 static 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
pkcs1pad_set_priv_key(struct crypto_akcipher * tfm,const void * key,unsigned int keylen)128 static 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
pkcs1pad_get_max_size(struct crypto_akcipher * tfm)149 static 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
pkcs1pad_sg_set_buf(struct scatterlist * sg,void * buf,size_t len,struct scatterlist * next)162 static 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
pkcs1pad_encrypt_sign_complete(struct akcipher_request * req,int err)174 static 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_ATOMIC);
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
205 out:
206 req->dst_len = ctx->key_size;
207
208 kfree(req_ctx->in_buf);
209
210 return err;
211 }
212
pkcs1pad_encrypt_sign_complete_cb(void * data,int err)213 static void pkcs1pad_encrypt_sign_complete_cb(void *data, int err)
214 {
215 struct akcipher_request *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] = get_random_u32_inclusive(1, 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 kfree_sensitive(req_ctx->out_buf);
324
325 return err;
326 }
327
pkcs1pad_decrypt_complete_cb(void * data,int err)328 static void pkcs1pad_decrypt_complete_cb(void *data, int err)
329 {
330 struct akcipher_request *req = data;
331
332 if (err == -EINPROGRESS)
333 goto out;
334
335 err = pkcs1pad_decrypt_complete(req, err);
336
337 out:
338 akcipher_request_complete(req, err);
339 }
340
pkcs1pad_decrypt(struct akcipher_request * req)341 static int pkcs1pad_decrypt(struct akcipher_request *req)
342 {
343 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
344 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
345 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
346 int err;
347
348 if (!ctx->key_size || req->src_len != ctx->key_size)
349 return -EINVAL;
350
351 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
352 if (!req_ctx->out_buf)
353 return -ENOMEM;
354
355 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
356 ctx->key_size, NULL);
357
358 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
359 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
360 pkcs1pad_decrypt_complete_cb, req);
361
362 /* Reuse input buffer, output to a new buffer */
363 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
364 req_ctx->out_sg, req->src_len,
365 ctx->key_size);
366
367 err = crypto_akcipher_decrypt(&req_ctx->child_req);
368 if (err != -EINPROGRESS && err != -EBUSY)
369 return pkcs1pad_decrypt_complete(req, err);
370
371 return err;
372 }
373
pkcs1pad_sign(struct akcipher_request * req)374 static int pkcs1pad_sign(struct akcipher_request *req)
375 {
376 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
377 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
378 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
379 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
380 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
381 const struct rsa_asn1_template *digest_info = ictx->digest_info;
382 int err;
383 unsigned int ps_end, digest_info_size = 0;
384
385 if (!ctx->key_size)
386 return -EINVAL;
387
388 if (digest_info)
389 digest_info_size = digest_info->size;
390
391 if (req->src_len + digest_info_size > ctx->key_size - 11)
392 return -EOVERFLOW;
393
394 if (req->dst_len < ctx->key_size) {
395 req->dst_len = ctx->key_size;
396 return -EOVERFLOW;
397 }
398
399 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
400 GFP_KERNEL);
401 if (!req_ctx->in_buf)
402 return -ENOMEM;
403
404 ps_end = ctx->key_size - digest_info_size - req->src_len - 2;
405 req_ctx->in_buf[0] = 0x01;
406 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
407 req_ctx->in_buf[ps_end] = 0x00;
408
409 if (digest_info)
410 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
411 digest_info->size);
412
413 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
414 ctx->key_size - 1 - req->src_len, req->src);
415
416 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
417 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
418 pkcs1pad_encrypt_sign_complete_cb, req);
419
420 /* Reuse output buffer */
421 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
422 req->dst, ctx->key_size - 1, req->dst_len);
423
424 err = crypto_akcipher_decrypt(&req_ctx->child_req);
425 if (err != -EINPROGRESS && err != -EBUSY)
426 return pkcs1pad_encrypt_sign_complete(req, err);
427
428 return err;
429 }
430
pkcs1pad_verify_complete(struct akcipher_request * req,int err)431 static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
432 {
433 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
434 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
435 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
436 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
437 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
438 const struct rsa_asn1_template *digest_info = ictx->digest_info;
439 const unsigned int sig_size = req->src_len;
440 const unsigned int digest_size = req->dst_len;
441 unsigned int dst_len;
442 unsigned int pos;
443 u8 *out_buf;
444
445 if (err)
446 goto done;
447
448 err = -EINVAL;
449 dst_len = req_ctx->child_req.dst_len;
450 if (dst_len < ctx->key_size - 1)
451 goto done;
452
453 out_buf = req_ctx->out_buf;
454 if (dst_len == ctx->key_size) {
455 if (out_buf[0] != 0x00)
456 /* Decrypted value had no leading 0 byte */
457 goto done;
458
459 dst_len--;
460 out_buf++;
461 }
462
463 err = -EBADMSG;
464 if (out_buf[0] != 0x01)
465 goto done;
466
467 for (pos = 1; pos < dst_len; pos++)
468 if (out_buf[pos] != 0xff)
469 break;
470
471 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
472 goto done;
473 pos++;
474
475 if (digest_info) {
476 if (digest_info->size > dst_len - pos)
477 goto done;
478 if (crypto_memneq(out_buf + pos, digest_info->data,
479 digest_info->size))
480 goto done;
481
482 pos += digest_info->size;
483 }
484
485 err = 0;
486
487 if (digest_size != dst_len - pos) {
488 err = -EKEYREJECTED;
489 req->dst_len = dst_len - pos;
490 goto done;
491 }
492 /* Extract appended digest. */
493 sg_pcopy_to_buffer(req->src,
494 sg_nents_for_len(req->src, sig_size + digest_size),
495 req_ctx->out_buf + ctx->key_size,
496 digest_size, sig_size);
497 /* Do the actual verification step. */
498 if (memcmp(req_ctx->out_buf + ctx->key_size, out_buf + pos,
499 digest_size) != 0)
500 err = -EKEYREJECTED;
501 done:
502 kfree_sensitive(req_ctx->out_buf);
503
504 return err;
505 }
506
pkcs1pad_verify_complete_cb(void * data,int err)507 static void pkcs1pad_verify_complete_cb(void *data, int err)
508 {
509 struct akcipher_request *req = data;
510
511 if (err == -EINPROGRESS)
512 goto out;
513
514 err = pkcs1pad_verify_complete(req, err);
515
516 out:
517 akcipher_request_complete(req, err);
518 }
519
520 /*
521 * The verify operation is here for completeness similar to the verification
522 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
523 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
524 * retrieve the DigestInfo from a signature, instead the user is expected
525 * to call the sign operation to generate the expected signature and compare
526 * signatures instead of the message-digests.
527 */
pkcs1pad_verify(struct akcipher_request * req)528 static int pkcs1pad_verify(struct akcipher_request *req)
529 {
530 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
531 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
532 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
533 const unsigned int sig_size = req->src_len;
534 const unsigned int digest_size = req->dst_len;
535 int err;
536
537 if (WARN_ON(req->dst) || WARN_ON(!digest_size) ||
538 !ctx->key_size || sig_size != ctx->key_size)
539 return -EINVAL;
540
541 req_ctx->out_buf = kmalloc(ctx->key_size + digest_size, 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, sig_size, ctx->key_size);
555
556 err = crypto_akcipher_encrypt(&req_ctx->child_req);
557 if (err != -EINPROGRESS && err != -EBUSY)
558 return pkcs1pad_verify_complete(req, err);
559
560 return err;
561 }
562
pkcs1pad_init_tfm(struct crypto_akcipher * tfm)563 static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
564 {
565 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
566 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
567 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
568 struct crypto_akcipher *child_tfm;
569
570 child_tfm = crypto_spawn_akcipher(&ictx->spawn);
571 if (IS_ERR(child_tfm))
572 return PTR_ERR(child_tfm);
573
574 ctx->child = child_tfm;
575
576 akcipher_set_reqsize(tfm, sizeof(struct pkcs1pad_request) +
577 crypto_akcipher_reqsize(child_tfm));
578
579 return 0;
580 }
581
pkcs1pad_exit_tfm(struct crypto_akcipher * tfm)582 static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
583 {
584 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
585
586 crypto_free_akcipher(ctx->child);
587 }
588
pkcs1pad_free(struct akcipher_instance * inst)589 static void pkcs1pad_free(struct akcipher_instance *inst)
590 {
591 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
592 struct crypto_akcipher_spawn *spawn = &ctx->spawn;
593
594 crypto_drop_akcipher(spawn);
595 kfree(inst);
596 }
597
pkcs1pad_create(struct crypto_template * tmpl,struct rtattr ** tb)598 static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
599 {
600 u32 mask;
601 struct akcipher_instance *inst;
602 struct pkcs1pad_inst_ctx *ctx;
603 struct akcipher_alg *rsa_alg;
604 const char *hash_name;
605 int err;
606
607 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, &mask);
608 if (err)
609 return err;
610
611 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
612 if (!inst)
613 return -ENOMEM;
614
615 ctx = akcipher_instance_ctx(inst);
616
617 err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),
618 crypto_attr_alg_name(tb[1]), 0, mask);
619 if (err)
620 goto err_free_inst;
621
622 rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
623
624 if (strcmp(rsa_alg->base.cra_name, "rsa") != 0) {
625 err = -EINVAL;
626 goto err_free_inst;
627 }
628
629 err = -ENAMETOOLONG;
630 hash_name = crypto_attr_alg_name(tb[2]);
631 if (IS_ERR(hash_name)) {
632 if (snprintf(inst->alg.base.cra_name,
633 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
634 rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
635 goto err_free_inst;
636
637 if (snprintf(inst->alg.base.cra_driver_name,
638 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
639 rsa_alg->base.cra_driver_name) >=
640 CRYPTO_MAX_ALG_NAME)
641 goto err_free_inst;
642 } else {
643 ctx->digest_info = rsa_lookup_asn1(hash_name);
644 if (!ctx->digest_info) {
645 err = -EINVAL;
646 goto err_free_inst;
647 }
648
649 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
650 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name,
651 hash_name) >= CRYPTO_MAX_ALG_NAME)
652 goto err_free_inst;
653
654 if (snprintf(inst->alg.base.cra_driver_name,
655 CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
656 rsa_alg->base.cra_driver_name,
657 hash_name) >= CRYPTO_MAX_ALG_NAME)
658 goto err_free_inst;
659 }
660
661 inst->alg.base.cra_priority = rsa_alg->base.cra_priority;
662 inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx);
663
664 inst->alg.init = pkcs1pad_init_tfm;
665 inst->alg.exit = pkcs1pad_exit_tfm;
666
667 inst->alg.encrypt = pkcs1pad_encrypt;
668 inst->alg.decrypt = pkcs1pad_decrypt;
669 inst->alg.sign = pkcs1pad_sign;
670 inst->alg.verify = pkcs1pad_verify;
671 inst->alg.set_pub_key = pkcs1pad_set_pub_key;
672 inst->alg.set_priv_key = pkcs1pad_set_priv_key;
673 inst->alg.max_size = pkcs1pad_get_max_size;
674
675 inst->free = pkcs1pad_free;
676
677 err = akcipher_register_instance(tmpl, inst);
678 if (err) {
679 err_free_inst:
680 pkcs1pad_free(inst);
681 }
682 return err;
683 }
684
685 struct crypto_template rsa_pkcs1pad_tmpl = {
686 .name = "pkcs1pad",
687 .create = pkcs1pad_create,
688 .module = THIS_MODULE,
689 };
690