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 u8 rsa_digest_info_sha3_256[] = { |
65 | 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, |
66 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x08, |
67 | 0x05, 0x00, 0x04, 0x20 |
68 | }; |
69 | |
70 | static const u8 rsa_digest_info_sha3_384[] = { |
71 | 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, |
72 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x09, |
73 | 0x05, 0x00, 0x04, 0x30 |
74 | }; |
75 | |
76 | static const u8 rsa_digest_info_sha3_512[] = { |
77 | 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, |
78 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x0A, |
79 | 0x05, 0x00, 0x04, 0x40 |
80 | }; |
81 | |
82 | static const struct rsa_asn1_template { |
83 | const char *name; |
84 | const u8 *data; |
85 | size_t size; |
86 | } rsa_asn1_templates[] = { |
87 | #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) } |
88 | _(md5), |
89 | _(sha1), |
90 | _(rmd160), |
91 | _(sha256), |
92 | _(sha384), |
93 | _(sha512), |
94 | _(sha224), |
95 | #undef _ |
96 | #define _(X) { "sha3-" #X, rsa_digest_info_sha3_##X, sizeof(rsa_digest_info_sha3_##X) } |
97 | _(256), |
98 | _(384), |
99 | _(512), |
100 | #undef _ |
101 | { NULL } |
102 | }; |
103 | |
104 | static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name) |
105 | { |
106 | const struct rsa_asn1_template *p; |
107 | |
108 | for (p = rsa_asn1_templates; p->name; p++) |
109 | if (strcmp(name, p->name) == 0) |
110 | return p; |
111 | return NULL; |
112 | } |
113 | |
114 | struct pkcs1pad_ctx { |
115 | struct crypto_akcipher *child; |
116 | unsigned int key_size; |
117 | }; |
118 | |
119 | struct pkcs1pad_inst_ctx { |
120 | struct crypto_akcipher_spawn spawn; |
121 | const struct rsa_asn1_template *digest_info; |
122 | }; |
123 | |
124 | struct pkcs1pad_request { |
125 | struct scatterlist in_sg[2], out_sg[1]; |
126 | uint8_t *in_buf, *out_buf; |
127 | struct akcipher_request child_req; |
128 | }; |
129 | |
130 | static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key, |
131 | unsigned int keylen) |
132 | { |
133 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
134 | int err; |
135 | |
136 | ctx->key_size = 0; |
137 | |
138 | err = crypto_akcipher_set_pub_key(tfm: ctx->child, key, keylen); |
139 | if (err) |
140 | return err; |
141 | |
142 | /* Find out new modulus size from rsa implementation */ |
143 | err = crypto_akcipher_maxsize(tfm: ctx->child); |
144 | if (err > PAGE_SIZE) |
145 | return -ENOTSUPP; |
146 | |
147 | ctx->key_size = err; |
148 | return 0; |
149 | } |
150 | |
151 | static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key, |
152 | unsigned int keylen) |
153 | { |
154 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
155 | int err; |
156 | |
157 | ctx->key_size = 0; |
158 | |
159 | err = crypto_akcipher_set_priv_key(tfm: ctx->child, key, keylen); |
160 | if (err) |
161 | return err; |
162 | |
163 | /* Find out new modulus size from rsa implementation */ |
164 | err = crypto_akcipher_maxsize(tfm: ctx->child); |
165 | if (err > PAGE_SIZE) |
166 | return -ENOTSUPP; |
167 | |
168 | ctx->key_size = err; |
169 | return 0; |
170 | } |
171 | |
172 | static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm) |
173 | { |
174 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
175 | |
176 | /* |
177 | * The maximum destination buffer size for the encrypt/sign operations |
178 | * will be the same as for RSA, even though it's smaller for |
179 | * decrypt/verify. |
180 | */ |
181 | |
182 | return ctx->key_size; |
183 | } |
184 | |
185 | static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len, |
186 | struct scatterlist *next) |
187 | { |
188 | int nsegs = next ? 2 : 1; |
189 | |
190 | sg_init_table(sg, nsegs); |
191 | sg_set_buf(sg, buf, buflen: len); |
192 | |
193 | if (next) |
194 | sg_chain(prv: sg, prv_nents: nsegs, sgl: next); |
195 | } |
196 | |
197 | static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err) |
198 | { |
199 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
200 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
201 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
202 | unsigned int pad_len; |
203 | unsigned int len; |
204 | u8 *out_buf; |
205 | |
206 | if (err) |
207 | goto out; |
208 | |
209 | len = req_ctx->child_req.dst_len; |
210 | pad_len = ctx->key_size - len; |
211 | |
212 | /* Four billion to one */ |
213 | if (likely(!pad_len)) |
214 | goto out; |
215 | |
216 | out_buf = kzalloc(size: ctx->key_size, GFP_ATOMIC); |
217 | err = -ENOMEM; |
218 | if (!out_buf) |
219 | goto out; |
220 | |
221 | sg_copy_to_buffer(sgl: req->dst, nents: sg_nents_for_len(sg: req->dst, len), |
222 | buf: out_buf + pad_len, buflen: len); |
223 | sg_copy_from_buffer(sgl: req->dst, |
224 | nents: sg_nents_for_len(sg: req->dst, len: ctx->key_size), |
225 | buf: out_buf, buflen: ctx->key_size); |
226 | kfree_sensitive(objp: out_buf); |
227 | |
228 | out: |
229 | req->dst_len = ctx->key_size; |
230 | |
231 | kfree(objp: req_ctx->in_buf); |
232 | |
233 | return err; |
234 | } |
235 | |
236 | static void pkcs1pad_encrypt_sign_complete_cb(void *data, int err) |
237 | { |
238 | struct akcipher_request *req = data; |
239 | |
240 | if (err == -EINPROGRESS) |
241 | goto out; |
242 | |
243 | err = pkcs1pad_encrypt_sign_complete(req, err); |
244 | |
245 | out: |
246 | akcipher_request_complete(req, err); |
247 | } |
248 | |
249 | static int pkcs1pad_encrypt(struct akcipher_request *req) |
250 | { |
251 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
252 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
253 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
254 | int err; |
255 | unsigned int i, ps_end; |
256 | |
257 | if (!ctx->key_size) |
258 | return -EINVAL; |
259 | |
260 | if (req->src_len > ctx->key_size - 11) |
261 | return -EOVERFLOW; |
262 | |
263 | if (req->dst_len < ctx->key_size) { |
264 | req->dst_len = ctx->key_size; |
265 | return -EOVERFLOW; |
266 | } |
267 | |
268 | req_ctx->in_buf = kmalloc(size: ctx->key_size - 1 - req->src_len, |
269 | GFP_KERNEL); |
270 | if (!req_ctx->in_buf) |
271 | return -ENOMEM; |
272 | |
273 | ps_end = ctx->key_size - req->src_len - 2; |
274 | req_ctx->in_buf[0] = 0x02; |
275 | for (i = 1; i < ps_end; i++) |
276 | req_ctx->in_buf[i] = get_random_u32_inclusive(floor: 1, ceil: 255); |
277 | req_ctx->in_buf[ps_end] = 0x00; |
278 | |
279 | pkcs1pad_sg_set_buf(sg: req_ctx->in_sg, buf: req_ctx->in_buf, |
280 | len: ctx->key_size - 1 - req->src_len, next: req->src); |
281 | |
282 | akcipher_request_set_tfm(req: &req_ctx->child_req, tfm: ctx->child); |
283 | akcipher_request_set_callback(req: &req_ctx->child_req, flgs: req->base.flags, |
284 | cmpl: pkcs1pad_encrypt_sign_complete_cb, data: req); |
285 | |
286 | /* Reuse output buffer */ |
287 | akcipher_request_set_crypt(req: &req_ctx->child_req, src: req_ctx->in_sg, |
288 | dst: req->dst, src_len: ctx->key_size - 1, dst_len: req->dst_len); |
289 | |
290 | err = crypto_akcipher_encrypt(req: &req_ctx->child_req); |
291 | if (err != -EINPROGRESS && err != -EBUSY) |
292 | return pkcs1pad_encrypt_sign_complete(req, err); |
293 | |
294 | return err; |
295 | } |
296 | |
297 | static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) |
298 | { |
299 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
300 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
301 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
302 | unsigned int dst_len; |
303 | unsigned int pos; |
304 | u8 *out_buf; |
305 | |
306 | if (err) |
307 | goto done; |
308 | |
309 | err = -EINVAL; |
310 | dst_len = req_ctx->child_req.dst_len; |
311 | if (dst_len < ctx->key_size - 1) |
312 | goto done; |
313 | |
314 | out_buf = req_ctx->out_buf; |
315 | if (dst_len == ctx->key_size) { |
316 | if (out_buf[0] != 0x00) |
317 | /* Decrypted value had no leading 0 byte */ |
318 | goto done; |
319 | |
320 | dst_len--; |
321 | out_buf++; |
322 | } |
323 | |
324 | if (out_buf[0] != 0x02) |
325 | goto done; |
326 | |
327 | for (pos = 1; pos < dst_len; pos++) |
328 | if (out_buf[pos] == 0x00) |
329 | break; |
330 | if (pos < 9 || pos == dst_len) |
331 | goto done; |
332 | pos++; |
333 | |
334 | err = 0; |
335 | |
336 | if (req->dst_len < dst_len - pos) |
337 | err = -EOVERFLOW; |
338 | req->dst_len = dst_len - pos; |
339 | |
340 | if (!err) |
341 | sg_copy_from_buffer(sgl: req->dst, |
342 | nents: sg_nents_for_len(sg: req->dst, len: req->dst_len), |
343 | buf: out_buf + pos, buflen: req->dst_len); |
344 | |
345 | done: |
346 | kfree_sensitive(objp: req_ctx->out_buf); |
347 | |
348 | return err; |
349 | } |
350 | |
351 | static void pkcs1pad_decrypt_complete_cb(void *data, int err) |
352 | { |
353 | struct akcipher_request *req = data; |
354 | |
355 | if (err == -EINPROGRESS) |
356 | goto out; |
357 | |
358 | err = pkcs1pad_decrypt_complete(req, err); |
359 | |
360 | out: |
361 | akcipher_request_complete(req, err); |
362 | } |
363 | |
364 | static int pkcs1pad_decrypt(struct akcipher_request *req) |
365 | { |
366 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
367 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
368 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
369 | int err; |
370 | |
371 | if (!ctx->key_size || req->src_len != ctx->key_size) |
372 | return -EINVAL; |
373 | |
374 | req_ctx->out_buf = kmalloc(size: ctx->key_size, GFP_KERNEL); |
375 | if (!req_ctx->out_buf) |
376 | return -ENOMEM; |
377 | |
378 | pkcs1pad_sg_set_buf(sg: req_ctx->out_sg, buf: req_ctx->out_buf, |
379 | len: ctx->key_size, NULL); |
380 | |
381 | akcipher_request_set_tfm(req: &req_ctx->child_req, tfm: ctx->child); |
382 | akcipher_request_set_callback(req: &req_ctx->child_req, flgs: req->base.flags, |
383 | cmpl: pkcs1pad_decrypt_complete_cb, data: req); |
384 | |
385 | /* Reuse input buffer, output to a new buffer */ |
386 | akcipher_request_set_crypt(req: &req_ctx->child_req, src: req->src, |
387 | dst: req_ctx->out_sg, src_len: req->src_len, |
388 | dst_len: ctx->key_size); |
389 | |
390 | err = crypto_akcipher_decrypt(req: &req_ctx->child_req); |
391 | if (err != -EINPROGRESS && err != -EBUSY) |
392 | return pkcs1pad_decrypt_complete(req, err); |
393 | |
394 | return err; |
395 | } |
396 | |
397 | static int pkcs1pad_sign(struct akcipher_request *req) |
398 | { |
399 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
400 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
401 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
402 | struct akcipher_instance *inst = akcipher_alg_instance(akcipher: tfm); |
403 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); |
404 | const struct rsa_asn1_template *digest_info = ictx->digest_info; |
405 | int err; |
406 | unsigned int ps_end, digest_info_size = 0; |
407 | |
408 | if (!ctx->key_size) |
409 | return -EINVAL; |
410 | |
411 | if (digest_info) |
412 | digest_info_size = digest_info->size; |
413 | |
414 | if (req->src_len + digest_info_size > ctx->key_size - 11) |
415 | return -EOVERFLOW; |
416 | |
417 | if (req->dst_len < ctx->key_size) { |
418 | req->dst_len = ctx->key_size; |
419 | return -EOVERFLOW; |
420 | } |
421 | |
422 | req_ctx->in_buf = kmalloc(size: ctx->key_size - 1 - req->src_len, |
423 | GFP_KERNEL); |
424 | if (!req_ctx->in_buf) |
425 | return -ENOMEM; |
426 | |
427 | ps_end = ctx->key_size - digest_info_size - req->src_len - 2; |
428 | req_ctx->in_buf[0] = 0x01; |
429 | memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); |
430 | req_ctx->in_buf[ps_end] = 0x00; |
431 | |
432 | if (digest_info) |
433 | memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, |
434 | digest_info->size); |
435 | |
436 | pkcs1pad_sg_set_buf(sg: req_ctx->in_sg, buf: req_ctx->in_buf, |
437 | len: ctx->key_size - 1 - req->src_len, next: req->src); |
438 | |
439 | akcipher_request_set_tfm(req: &req_ctx->child_req, tfm: ctx->child); |
440 | akcipher_request_set_callback(req: &req_ctx->child_req, flgs: req->base.flags, |
441 | cmpl: pkcs1pad_encrypt_sign_complete_cb, data: req); |
442 | |
443 | /* Reuse output buffer */ |
444 | akcipher_request_set_crypt(req: &req_ctx->child_req, src: req_ctx->in_sg, |
445 | dst: req->dst, src_len: ctx->key_size - 1, dst_len: req->dst_len); |
446 | |
447 | err = crypto_akcipher_decrypt(req: &req_ctx->child_req); |
448 | if (err != -EINPROGRESS && err != -EBUSY) |
449 | return pkcs1pad_encrypt_sign_complete(req, err); |
450 | |
451 | return err; |
452 | } |
453 | |
454 | static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) |
455 | { |
456 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
457 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
458 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
459 | struct akcipher_instance *inst = akcipher_alg_instance(akcipher: tfm); |
460 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); |
461 | const struct rsa_asn1_template *digest_info = ictx->digest_info; |
462 | const unsigned int sig_size = req->src_len; |
463 | const unsigned int digest_size = req->dst_len; |
464 | unsigned int dst_len; |
465 | unsigned int pos; |
466 | u8 *out_buf; |
467 | |
468 | if (err) |
469 | goto done; |
470 | |
471 | err = -EINVAL; |
472 | dst_len = req_ctx->child_req.dst_len; |
473 | if (dst_len < ctx->key_size - 1) |
474 | goto done; |
475 | |
476 | out_buf = req_ctx->out_buf; |
477 | if (dst_len == ctx->key_size) { |
478 | if (out_buf[0] != 0x00) |
479 | /* Decrypted value had no leading 0 byte */ |
480 | goto done; |
481 | |
482 | dst_len--; |
483 | out_buf++; |
484 | } |
485 | |
486 | err = -EBADMSG; |
487 | if (out_buf[0] != 0x01) |
488 | goto done; |
489 | |
490 | for (pos = 1; pos < dst_len; pos++) |
491 | if (out_buf[pos] != 0xff) |
492 | break; |
493 | |
494 | if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00) |
495 | goto done; |
496 | pos++; |
497 | |
498 | if (digest_info) { |
499 | if (digest_info->size > dst_len - pos) |
500 | goto done; |
501 | if (crypto_memneq(a: out_buf + pos, b: digest_info->data, |
502 | size: digest_info->size)) |
503 | goto done; |
504 | |
505 | pos += digest_info->size; |
506 | } |
507 | |
508 | err = 0; |
509 | |
510 | if (digest_size != dst_len - pos) { |
511 | err = -EKEYREJECTED; |
512 | req->dst_len = dst_len - pos; |
513 | goto done; |
514 | } |
515 | /* Extract appended digest. */ |
516 | sg_pcopy_to_buffer(sgl: req->src, |
517 | nents: sg_nents_for_len(sg: req->src, len: sig_size + digest_size), |
518 | buf: req_ctx->out_buf + ctx->key_size, |
519 | buflen: digest_size, skip: sig_size); |
520 | /* Do the actual verification step. */ |
521 | if (memcmp(p: req_ctx->out_buf + ctx->key_size, q: out_buf + pos, |
522 | size: digest_size) != 0) |
523 | err = -EKEYREJECTED; |
524 | done: |
525 | kfree_sensitive(objp: req_ctx->out_buf); |
526 | |
527 | return err; |
528 | } |
529 | |
530 | static void pkcs1pad_verify_complete_cb(void *data, int err) |
531 | { |
532 | struct akcipher_request *req = data; |
533 | |
534 | if (err == -EINPROGRESS) |
535 | goto out; |
536 | |
537 | err = pkcs1pad_verify_complete(req, err); |
538 | |
539 | out: |
540 | akcipher_request_complete(req, err); |
541 | } |
542 | |
543 | /* |
544 | * The verify operation is here for completeness similar to the verification |
545 | * defined in RFC2313 section 10.2 except that block type 0 is not accepted, |
546 | * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to |
547 | * retrieve the DigestInfo from a signature, instead the user is expected |
548 | * to call the sign operation to generate the expected signature and compare |
549 | * signatures instead of the message-digests. |
550 | */ |
551 | static int pkcs1pad_verify(struct akcipher_request *req) |
552 | { |
553 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); |
554 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
555 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); |
556 | const unsigned int sig_size = req->src_len; |
557 | const unsigned int digest_size = req->dst_len; |
558 | int err; |
559 | |
560 | if (WARN_ON(req->dst) || WARN_ON(!digest_size) || |
561 | !ctx->key_size || sig_size != ctx->key_size) |
562 | return -EINVAL; |
563 | |
564 | req_ctx->out_buf = kmalloc(size: ctx->key_size + digest_size, GFP_KERNEL); |
565 | if (!req_ctx->out_buf) |
566 | return -ENOMEM; |
567 | |
568 | pkcs1pad_sg_set_buf(sg: req_ctx->out_sg, buf: req_ctx->out_buf, |
569 | len: ctx->key_size, NULL); |
570 | |
571 | akcipher_request_set_tfm(req: &req_ctx->child_req, tfm: ctx->child); |
572 | akcipher_request_set_callback(req: &req_ctx->child_req, flgs: req->base.flags, |
573 | cmpl: pkcs1pad_verify_complete_cb, data: req); |
574 | |
575 | /* Reuse input buffer, output to a new buffer */ |
576 | akcipher_request_set_crypt(req: &req_ctx->child_req, src: req->src, |
577 | dst: req_ctx->out_sg, src_len: sig_size, dst_len: ctx->key_size); |
578 | |
579 | err = crypto_akcipher_encrypt(req: &req_ctx->child_req); |
580 | if (err != -EINPROGRESS && err != -EBUSY) |
581 | return pkcs1pad_verify_complete(req, err); |
582 | |
583 | return err; |
584 | } |
585 | |
586 | static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) |
587 | { |
588 | struct akcipher_instance *inst = akcipher_alg_instance(akcipher: tfm); |
589 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); |
590 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
591 | struct crypto_akcipher *child_tfm; |
592 | |
593 | child_tfm = crypto_spawn_akcipher(spawn: &ictx->spawn); |
594 | if (IS_ERR(ptr: child_tfm)) |
595 | return PTR_ERR(ptr: child_tfm); |
596 | |
597 | ctx->child = child_tfm; |
598 | |
599 | akcipher_set_reqsize(akcipher: tfm, reqsize: sizeof(struct pkcs1pad_request) + |
600 | crypto_akcipher_reqsize(tfm: child_tfm)); |
601 | |
602 | return 0; |
603 | } |
604 | |
605 | static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) |
606 | { |
607 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
608 | |
609 | crypto_free_akcipher(tfm: ctx->child); |
610 | } |
611 | |
612 | static void pkcs1pad_free(struct akcipher_instance *inst) |
613 | { |
614 | struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst); |
615 | struct crypto_akcipher_spawn *spawn = &ctx->spawn; |
616 | |
617 | crypto_drop_akcipher(spawn); |
618 | kfree(objp: inst); |
619 | } |
620 | |
621 | static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) |
622 | { |
623 | u32 mask; |
624 | struct akcipher_instance *inst; |
625 | struct pkcs1pad_inst_ctx *ctx; |
626 | struct akcipher_alg *rsa_alg; |
627 | const char *hash_name; |
628 | int err; |
629 | |
630 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AKCIPHER, mask_ret: &mask); |
631 | if (err) |
632 | return err; |
633 | |
634 | inst = kzalloc(size: sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
635 | if (!inst) |
636 | return -ENOMEM; |
637 | |
638 | ctx = akcipher_instance_ctx(inst); |
639 | |
640 | err = crypto_grab_akcipher(spawn: &ctx->spawn, inst: akcipher_crypto_instance(inst), |
641 | name: crypto_attr_alg_name(rta: tb[1]), type: 0, mask); |
642 | if (err) |
643 | goto err_free_inst; |
644 | |
645 | rsa_alg = crypto_spawn_akcipher_alg(spawn: &ctx->spawn); |
646 | |
647 | if (strcmp(rsa_alg->base.cra_name, "rsa" ) != 0) { |
648 | err = -EINVAL; |
649 | goto err_free_inst; |
650 | } |
651 | |
652 | err = -ENAMETOOLONG; |
653 | hash_name = crypto_attr_alg_name(rta: tb[2]); |
654 | if (IS_ERR(ptr: hash_name)) { |
655 | if (snprintf(buf: inst->alg.base.cra_name, |
656 | CRYPTO_MAX_ALG_NAME, fmt: "pkcs1pad(%s)" , |
657 | rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) |
658 | goto err_free_inst; |
659 | |
660 | if (snprintf(buf: inst->alg.base.cra_driver_name, |
661 | CRYPTO_MAX_ALG_NAME, fmt: "pkcs1pad(%s)" , |
662 | rsa_alg->base.cra_driver_name) >= |
663 | CRYPTO_MAX_ALG_NAME) |
664 | goto err_free_inst; |
665 | } else { |
666 | ctx->digest_info = rsa_lookup_asn1(name: hash_name); |
667 | if (!ctx->digest_info) { |
668 | err = -EINVAL; |
669 | goto err_free_inst; |
670 | } |
671 | |
672 | if (snprintf(buf: inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
673 | fmt: "pkcs1pad(%s,%s)" , rsa_alg->base.cra_name, |
674 | hash_name) >= CRYPTO_MAX_ALG_NAME) |
675 | goto err_free_inst; |
676 | |
677 | if (snprintf(buf: inst->alg.base.cra_driver_name, |
678 | CRYPTO_MAX_ALG_NAME, fmt: "pkcs1pad(%s,%s)" , |
679 | rsa_alg->base.cra_driver_name, |
680 | hash_name) >= CRYPTO_MAX_ALG_NAME) |
681 | goto err_free_inst; |
682 | } |
683 | |
684 | inst->alg.base.cra_priority = rsa_alg->base.cra_priority; |
685 | inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); |
686 | |
687 | inst->alg.init = pkcs1pad_init_tfm; |
688 | inst->alg.exit = pkcs1pad_exit_tfm; |
689 | |
690 | inst->alg.encrypt = pkcs1pad_encrypt; |
691 | inst->alg.decrypt = pkcs1pad_decrypt; |
692 | inst->alg.sign = pkcs1pad_sign; |
693 | inst->alg.verify = pkcs1pad_verify; |
694 | inst->alg.set_pub_key = pkcs1pad_set_pub_key; |
695 | inst->alg.set_priv_key = pkcs1pad_set_priv_key; |
696 | inst->alg.max_size = pkcs1pad_get_max_size; |
697 | |
698 | inst->free = pkcs1pad_free; |
699 | |
700 | err = akcipher_register_instance(tmpl, inst); |
701 | if (err) { |
702 | err_free_inst: |
703 | pkcs1pad_free(inst); |
704 | } |
705 | return err; |
706 | } |
707 | |
708 | struct crypto_template rsa_pkcs1pad_tmpl = { |
709 | .name = "pkcs1pad" , |
710 | .create = pkcs1pad_create, |
711 | .module = THIS_MODULE, |
712 | }; |
713 | |
714 | MODULE_ALIAS_CRYPTO("pkcs1pad" ); |
715 | |