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Merge tag 'actions-arm-dt-for-4.13' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / crypto / rsa-pkcs1pad.c
CommitLineData
3d5b1ecd
AZ		 1/*
2 * RSA padding templates.
3 *
4 * Copyright (c) 2015 Intel Corporation
5 *
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.
10 */
11
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>
20
a49de377
TS		 21/*
22 * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2].
23 */
24static 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
28};
29
30static const u8 rsa_digest_info_sha1[] = {
31 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
32 0x2b, 0x0e, 0x03, 0x02, 0x1a,
33 0x05, 0x00, 0x04, 0x14
34};
35
36static const u8 rsa_digest_info_rmd160[] = {
37 0x30, 0x21, 0x30, 0x09, 0x06, 0x05,
38 0x2b, 0x24, 0x03, 0x02, 0x01,
39 0x05, 0x00, 0x04, 0x14
40};
41
42static 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
46};
47
48static 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
52};
53
54static 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
58};
59
60static 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
64};
65
66static 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 _
81};
82
83static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name)
84{
85 const struct rsa_asn1_template *p;
86
87 for (p = rsa_asn1_templates; p->name; p++)
88 if (strcmp(name, p->name) == 0)
89 return p;
90 return NULL;
91}
92
3d5b1ecd
AZ		 93struct pkcs1pad_ctx {
94 struct crypto_akcipher *child;
3d5b1ecd
AZ		 95 unsigned int key_size;
96};
97
a49de377
TS		 98struct pkcs1pad_inst_ctx {
99 struct crypto_akcipher_spawn spawn;
c0d20d22 100 const struct rsa_asn1_template *digest_info;
a49de377
TS		 101};
102
3d5b1ecd 103struct pkcs1pad_request {
0f2c8319 104 struct scatterlist in_sg[2], out_sg[1];
3d5b1ecd 105 uint8_t *in_buf, *out_buf;
a6d7bfd0 106 struct akcipher_request child_req;
3d5b1ecd
AZ		 107};
108
109static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key,
110 unsigned int keylen)
111{
112 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
73f79189
HX		 113 int err;
114
115 ctx->key_size = 0;
3d5b1ecd
AZ		 116
117 err = crypto_akcipher_set_pub_key(ctx->child, key, keylen);
73f79189
HX		 118 if (err)
119 return err;
3d5b1ecd 120
73f79189
HX		 121 /* Find out new modulus size from rsa implementation */
122 err = crypto_akcipher_maxsize(ctx->child);
123 if (err < 0)
124 return err;
3d5b1ecd 125
73f79189
HX		 126 if (err > PAGE_SIZE)
127 return -ENOTSUPP;
3d5b1ecd 128
73f79189
HX		 129 ctx->key_size = err;
130 return 0;
3d5b1ecd
AZ		 131}
132
133static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key,
134 unsigned int keylen)
135{
136 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
73f79189
HX		 137 int err;
138
139 ctx->key_size = 0;
3d5b1ecd
AZ		 140
141 err = crypto_akcipher_set_priv_key(ctx->child, key, keylen);
73f79189
HX		 142 if (err)
143 return err;
3d5b1ecd 144
73f79189
HX		 145 /* Find out new modulus size from rsa implementation */
146 err = crypto_akcipher_maxsize(ctx->child);
147 if (err < 0)
148 return err;
3d5b1ecd 149
73f79189
HX		 150 if (err > PAGE_SIZE)
151 return -ENOTSUPP;
3d5b1ecd 152
73f79189
HX		 153 ctx->key_size = err;
154 return 0;
3d5b1ecd
AZ		 155}
156
157static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm)
158{
159 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
160
161 /*
162 * The maximum destination buffer size for the encrypt/sign operations
163 * will be the same as for RSA, even though it's smaller for
164 * decrypt/verify.
165 */
166
167 return ctx->key_size ?: -EINVAL;
168}
169
170static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len,
171 struct scatterlist *next)
172{
0f2c8319
HX		 173 int nsegs = next ? 2 : 1;
174
175 sg_init_table(sg, nsegs);
176 sg_set_buf(sg, buf, len);
3d5b1ecd
AZ		 177
178 if (next)
179 sg_chain(sg, nsegs, next);
180}
181
182static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
183{
184 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
185 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
186 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
d858b071
HX		 187 unsigned int pad_len;
188 unsigned int len;
189 u8 *out_buf;
190
191 if (err)
192 goto out;
193
194 len = req_ctx->child_req.dst_len;
195 pad_len = ctx->key_size - len;
196
197 /* Four billion to one */
198 if (likely(!pad_len))
199 goto out;
200
201 out_buf = kzalloc(ctx->key_size, GFP_ATOMIC);
202 err = -ENOMEM;
203 if (!out_buf)
204 goto out;
205
206 sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
207 out_buf + pad_len, len);
208 sg_copy_from_buffer(req->dst,
209 sg_nents_for_len(req->dst, ctx->key_size),
210 out_buf, ctx->key_size);
211 kzfree(out_buf);
212
213out:
3d5b1ecd
AZ		 214 req->dst_len = ctx->key_size;
215
216 kfree(req_ctx->in_buf);
3d5b1ecd
AZ		 217
218 return err;
219}
220
221static void pkcs1pad_encrypt_sign_complete_cb(
222 struct crypto_async_request *child_async_req, int err)
223{
224 struct akcipher_request *req = child_async_req->data;
225 struct crypto_async_request async_req;
226
227 if (err == -EINPROGRESS)
228 return;
229
230 async_req.data = req->base.data;
231 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
232 async_req.flags = child_async_req->flags;
233 req->base.complete(&async_req,
234 pkcs1pad_encrypt_sign_complete(req, err));
235}
236
237static int pkcs1pad_encrypt(struct akcipher_request *req)
238{
239 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
240 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
241 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
242 int err;
243 unsigned int i, ps_end;
244
245 if (!ctx->key_size)
246 return -EINVAL;
247
248 if (req->src_len > ctx->key_size - 11)
249 return -EOVERFLOW;
250
251 if (req->dst_len < ctx->key_size) {
252 req->dst_len = ctx->key_size;
253 return -EOVERFLOW;
254 }
255
3d5b1ecd 256 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
3a32ce50 257 GFP_KERNEL);
3d5b1ecd
AZ		 258 if (!req_ctx->in_buf)
259 return -ENOMEM;
260
261 ps_end = ctx->key_size - req->src_len - 2;
262 req_ctx->in_buf[0] = 0x02;
263 for (i = 1; i < ps_end; i++)
264 req_ctx->in_buf[i] = 1 + prandom_u32_max(255);
265 req_ctx->in_buf[ps_end] = 0x00;
266
267 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
268 ctx->key_size - 1 - req->src_len, req->src);
269
3a32ce50 270 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
3d5b1ecd
AZ		 271 if (!req_ctx->out_buf) {
272 kfree(req_ctx->in_buf);
273 return -ENOMEM;
274 }
275
276 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
277 ctx->key_size, NULL);
278
279 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
280 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
281 pkcs1pad_encrypt_sign_complete_cb, req);
282
d858b071
HX		 283 /* Reuse output buffer */
284 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
285 req->dst, ctx->key_size - 1, req->dst_len);
286
3d5b1ecd
AZ		 287 err = crypto_akcipher_encrypt(&req_ctx->child_req);
288 if (err != -EINPROGRESS &&
289 (err != -EBUSY ||
290 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
291 return pkcs1pad_encrypt_sign_complete(req, err);
292
293 return err;
294}
295
296static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err)
297{
298 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
299 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
300 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
0cf43f50 301 unsigned int dst_len;
3d5b1ecd 302 unsigned int pos;
0cf43f50 303 u8 *out_buf;
3d5b1ecd
AZ		 304
305 if (err)
306 goto done;
307
0cf43f50
HX		 308 err = -EINVAL;
309 dst_len = req_ctx->child_req.dst_len;
310 if (dst_len < ctx->key_size - 1)
3d5b1ecd 311 goto done;
0cf43f50
HX		 312
313 out_buf = req_ctx->out_buf;
314 if (dst_len == ctx->key_size) {
315 if (out_buf[0] != 0x00)
316 /* Decrypted value had no leading 0 byte */
317 goto done;
318
319 dst_len--;
320 out_buf++;
3d5b1ecd
AZ		 321 }
322
0cf43f50 323 if (out_buf[0] != 0x02)
3d5b1ecd 324 goto done;
0cf43f50
HX		 325
326 for (pos = 1; pos < dst_len; pos++)
327 if (out_buf[pos] == 0x00)
3d5b1ecd 328 break;
0cf43f50 329 if (pos < 9 || pos == dst_len)
3d5b1ecd 330 goto done;
3d5b1ecd
AZ		 331 pos++;
332
0cf43f50
HX		 333 err = 0;
334
335 if (req->dst_len < dst_len - pos)
3d5b1ecd 336 err = -EOVERFLOW;
0cf43f50 337 req->dst_len = dst_len - pos;
3d5b1ecd
AZ		 338
339 if (!err)
340 sg_copy_from_buffer(req->dst,
341 sg_nents_for_len(req->dst, req->dst_len),
0cf43f50 342 out_buf + pos, req->dst_len);
3d5b1ecd
AZ		 343
344done:
345 kzfree(req_ctx->out_buf);
346
347 return err;
348}
349
350static void pkcs1pad_decrypt_complete_cb(
351 struct crypto_async_request *child_async_req, int err)
352{
353 struct akcipher_request *req = child_async_req->data;
354 struct crypto_async_request async_req;
355
356 if (err == -EINPROGRESS)
357 return;
358
359 async_req.data = req->base.data;
360 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
361 async_req.flags = child_async_req->flags;
362 req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err));
363}
364
365static int pkcs1pad_decrypt(struct akcipher_request *req)
366{
367 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
368 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
369 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
370 int err;
371
372 if (!ctx->key_size || req->src_len != ctx->key_size)
373 return -EINVAL;
374
3a32ce50 375 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
3d5b1ecd
AZ		 376 if (!req_ctx->out_buf)
377 return -ENOMEM;
378
379 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
6f0904ad 380 ctx->key_size, NULL);
3d5b1ecd
AZ		 381
382 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
383 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
384 pkcs1pad_decrypt_complete_cb, req);
385
d858b071
HX		 386 /* Reuse input buffer, output to a new buffer */
387 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
388 req_ctx->out_sg, req->src_len,
389 ctx->key_size);
390
3d5b1ecd
AZ		 391 err = crypto_akcipher_decrypt(&req_ctx->child_req);
392 if (err != -EINPROGRESS &&
393 (err != -EBUSY ||
394 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
395 return pkcs1pad_decrypt_complete(req, err);
396
397 return err;
398}
399
400static int pkcs1pad_sign(struct akcipher_request *req)
401{
402 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
403 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
404 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
c0d20d22
HX		 405 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
406 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
407 const struct rsa_asn1_template *digest_info = ictx->digest_info;
3d5b1ecd 408 int err;
a49de377 409 unsigned int ps_end, digest_size = 0;
3d5b1ecd
AZ		 410
411 if (!ctx->key_size)
412 return -EINVAL;
413
c0d20d22 414 digest_size = digest_info->size;
a49de377
TS		 415
416 if (req->src_len + digest_size > ctx->key_size - 11)
3d5b1ecd
AZ		 417 return -EOVERFLOW;
418
419 if (req->dst_len < ctx->key_size) {
420 req->dst_len = ctx->key_size;
421 return -EOVERFLOW;
422 }
423
3d5b1ecd 424 req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len,
3a32ce50 425 GFP_KERNEL);
3d5b1ecd
AZ		 426 if (!req_ctx->in_buf)
427 return -ENOMEM;
428
a49de377 429 ps_end = ctx->key_size - digest_size - req->src_len - 2;
3d5b1ecd
AZ		 430 req_ctx->in_buf[0] = 0x01;
431 memset(req_ctx->in_buf + 1, 0xff, ps_end - 1);
432 req_ctx->in_buf[ps_end] = 0x00;
433
c0d20d22
HX		 434 memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data,
435 digest_info->size);
a49de377 436
3d5b1ecd
AZ		 437 pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf,
438 ctx->key_size - 1 - req->src_len, req->src);
439
3d5b1ecd
AZ		 440 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
441 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
442 pkcs1pad_encrypt_sign_complete_cb, req);
443
d858b071
HX		 444 /* Reuse output buffer */
445 akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg,
446 req->dst, ctx->key_size - 1, req->dst_len);
447
3d5b1ecd
AZ		 448 err = crypto_akcipher_sign(&req_ctx->child_req);
449 if (err != -EINPROGRESS &&
450 (err != -EBUSY ||
451 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
452 return pkcs1pad_encrypt_sign_complete(req, err);
453
454 return err;
455}
456
457static int pkcs1pad_verify_complete(struct akcipher_request *req, int err)
458{
459 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
460 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
461 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
c0d20d22
HX		 462 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
463 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
464 const struct rsa_asn1_template *digest_info = ictx->digest_info;
27710b8e 465 unsigned int dst_len;
3d5b1ecd 466 unsigned int pos;
27710b8e 467 u8 *out_buf;
3d5b1ecd
AZ		 468
469 if (err)
470 goto done;
471
27710b8e
HX		 472 err = -EINVAL;
473 dst_len = req_ctx->child_req.dst_len;
474 if (dst_len < ctx->key_size - 1)
3d5b1ecd 475 goto done;
27710b8e
HX		 476
477 out_buf = req_ctx->out_buf;
478 if (dst_len == ctx->key_size) {
479 if (out_buf[0] != 0x00)
480 /* Decrypted value had no leading 0 byte */
481 goto done;
482
483 dst_len--;
484 out_buf++;
3d5b1ecd
AZ		 485 }
486
a49de377 487 err = -EBADMSG;
27710b8e 488 if (out_buf[0] != 0x01)
3d5b1ecd 489 goto done;
a49de377 490
27710b8e
HX		 491 for (pos = 1; pos < dst_len; pos++)
492 if (out_buf[pos] != 0xff)
3d5b1ecd 493 break;
a49de377 494
27710b8e 495 if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00)
3d5b1ecd 496 goto done;
3d5b1ecd
AZ		 497 pos++;
498
27710b8e 499 if (memcmp(out_buf + pos, digest_info->data, digest_info->size))
c0d20d22 500 goto done;
a49de377 501
c0d20d22 502 pos += digest_info->size;
a49de377
TS		 503
504 err = 0;
505
27710b8e 506 if (req->dst_len < dst_len - pos)
3d5b1ecd 507 err = -EOVERFLOW;
27710b8e 508 req->dst_len = dst_len - pos;
3d5b1ecd
AZ		 509
510 if (!err)
511 sg_copy_from_buffer(req->dst,
512 sg_nents_for_len(req->dst, req->dst_len),
27710b8e 513 out_buf + pos, req->dst_len);
3d5b1ecd
AZ		 514done:
515 kzfree(req_ctx->out_buf);
516
517 return err;
518}
519
520static void pkcs1pad_verify_complete_cb(
521 struct crypto_async_request *child_async_req, int err)
522{
523 struct akcipher_request *req = child_async_req->data;
524 struct crypto_async_request async_req;
525
526 if (err == -EINPROGRESS)
527 return;
528
529 async_req.data = req->base.data;
530 async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req));
531 async_req.flags = child_async_req->flags;
532 req->base.complete(&async_req, pkcs1pad_verify_complete(req, err));
533}
534
535/*
536 * The verify operation is here for completeness similar to the verification
537 * defined in RFC2313 section 10.2 except that block type 0 is not accepted,
538 * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to
539 * retrieve the DigestInfo from a signature, instead the user is expected
540 * to call the sign operation to generate the expected signature and compare
541 * signatures instead of the message-digests.
542 */
543static int pkcs1pad_verify(struct akcipher_request *req)
544{
545 struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
546 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
547 struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
548 int err;
549
a49de377 550 if (!ctx->key_size || req->src_len < ctx->key_size)
3d5b1ecd
AZ		 551 return -EINVAL;
552
3a32ce50 553 req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL);
3d5b1ecd
AZ		 554 if (!req_ctx->out_buf)
555 return -ENOMEM;
556
557 pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf,
6f0904ad 558 ctx->key_size, NULL);
3d5b1ecd
AZ		 559
560 akcipher_request_set_tfm(&req_ctx->child_req, ctx->child);
561 akcipher_request_set_callback(&req_ctx->child_req, req->base.flags,
562 pkcs1pad_verify_complete_cb, req);
563
d858b071
HX		 564 /* Reuse input buffer, output to a new buffer */
565 akcipher_request_set_crypt(&req_ctx->child_req, req->src,
566 req_ctx->out_sg, req->src_len,
567 ctx->key_size);
568
3d5b1ecd
AZ		 569 err = crypto_akcipher_verify(&req_ctx->child_req);
570 if (err != -EINPROGRESS &&
571 (err != -EBUSY ||
572 !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG)))
573 return pkcs1pad_verify_complete(req, err);
574
575 return err;
576}
577
578static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm)
579{
580 struct akcipher_instance *inst = akcipher_alg_instance(tfm);
a49de377 581 struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst);
3d5b1ecd
AZ		 582 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
583 struct crypto_akcipher *child_tfm;
584
c0d20d22 585 child_tfm = crypto_spawn_akcipher(&ictx->spawn);
3d5b1ecd
AZ		 586 if (IS_ERR(child_tfm))
587 return PTR_ERR(child_tfm);
588
589 ctx->child = child_tfm;
3d5b1ecd
AZ		 590 return 0;
591}
592
593static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm)
594{
595 struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
596
597 crypto_free_akcipher(ctx->child);
598}
599
600static void pkcs1pad_free(struct akcipher_instance *inst)
601{
a49de377
TS		 602 struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst);
603 struct crypto_akcipher_spawn *spawn = &ctx->spawn;
3d5b1ecd
AZ		 604
605 crypto_drop_akcipher(spawn);
3d5b1ecd
AZ		 606 kfree(inst);
607}
608
609static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
610{
c0d20d22 611 const struct rsa_asn1_template *digest_info;
3d5b1ecd
AZ		 612 struct crypto_attr_type *algt;
613 struct akcipher_instance *inst;
a49de377 614 struct pkcs1pad_inst_ctx *ctx;
3d5b1ecd
AZ		 615 struct crypto_akcipher_spawn *spawn;
616 struct akcipher_alg *rsa_alg;
617 const char *rsa_alg_name;
a49de377 618 const char *hash_name;
3d5b1ecd
AZ		 619 int err;
620
621 algt = crypto_get_attr_type(tb);
622 if (IS_ERR(algt))
623 return PTR_ERR(algt);
624
625 if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
626 return -EINVAL;
627
628 rsa_alg_name = crypto_attr_alg_name(tb[1]);
629 if (IS_ERR(rsa_alg_name))
630 return PTR_ERR(rsa_alg_name);
631
a49de377
TS		 632 hash_name = crypto_attr_alg_name(tb[2]);
633 if (IS_ERR(hash_name))
c0d20d22
HX		 634 return PTR_ERR(hash_name);
635
636 digest_info = rsa_lookup_asn1(hash_name);
637 if (!digest_info)
638 return -EINVAL;
a49de377
TS		 639
640 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
3d5b1ecd
AZ		 641 if (!inst)
642 return -ENOMEM;
643
a49de377
TS		 644 ctx = akcipher_instance_ctx(inst);
645 spawn = &ctx->spawn;
c0d20d22 646 ctx->digest_info = digest_info;
a49de377 647
3d5b1ecd
AZ		 648 crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
649 err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
650 crypto_requires_sync(algt->type, algt->mask));
651 if (err)
652 goto out_free_inst;
653
654 rsa_alg = crypto_spawn_akcipher_alg(spawn);
655
656 err = -ENAMETOOLONG;
a49de377 657
c0d20d22
HX		 658 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
659 "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, hash_name) >=
660 CRYPTO_MAX_ALG_NAME ||
661 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
662 "pkcs1pad(%s,%s)",
663 rsa_alg->base.cra_driver_name, hash_name) >=
664 CRYPTO_MAX_ALG_NAME)
3d5b1ecd
AZ		 665 goto out_drop_alg;
666
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);
670
671 inst->alg.init = pkcs1pad_init_tfm;
672 inst->alg.exit = pkcs1pad_exit_tfm;
673
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;
682
683 inst->free = pkcs1pad_free;
684
685 err = akcipher_register_instance(tmpl, inst);
686 if (err)
c0d20d22 687 goto out_drop_alg;
3d5b1ecd
AZ		 688
689 return 0;
690
691out_drop_alg:
692 crypto_drop_akcipher(spawn);
693out_free_inst:
694 kfree(inst);
695 return err;
696}
697
698struct crypto_template rsa_pkcs1pad_tmpl = {
699 .name = "pkcs1pad",
700 .create = pkcs1pad_create,
701 .module = THIS_MODULE,
702};
Linux 6.x block layer and io_uring tree(s)