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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 | ||
21 | struct pkcs1pad_ctx { | |
22 | struct crypto_akcipher *child; | |
23 | ||
24 | unsigned int key_size; | |
25 | }; | |
26 | ||
27 | struct pkcs1pad_request { | |
28 | struct akcipher_request child_req; | |
29 | ||
30 | struct scatterlist in_sg[3], out_sg[2]; | |
31 | uint8_t *in_buf, *out_buf; | |
32 | }; | |
33 | ||
34 | static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key, | |
35 | unsigned int keylen) | |
36 | { | |
37 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
38 | int err, size; | |
39 | ||
40 | err = crypto_akcipher_set_pub_key(ctx->child, key, keylen); | |
41 | ||
42 | if (!err) { | |
43 | /* Find out new modulus size from rsa implementation */ | |
44 | size = crypto_akcipher_maxsize(ctx->child); | |
45 | ||
46 | ctx->key_size = size > 0 ? size : 0; | |
47 | if (size <= 0) | |
48 | err = size; | |
49 | } | |
50 | ||
51 | return err; | |
52 | } | |
53 | ||
54 | static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key, | |
55 | unsigned int keylen) | |
56 | { | |
57 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
58 | int err, size; | |
59 | ||
60 | err = crypto_akcipher_set_priv_key(ctx->child, key, keylen); | |
61 | ||
62 | if (!err) { | |
63 | /* Find out new modulus size from rsa implementation */ | |
64 | size = crypto_akcipher_maxsize(ctx->child); | |
65 | ||
66 | ctx->key_size = size > 0 ? size : 0; | |
67 | if (size <= 0) | |
68 | err = size; | |
69 | } | |
70 | ||
71 | return err; | |
72 | } | |
73 | ||
74 | static int pkcs1pad_get_max_size(struct crypto_akcipher *tfm) | |
75 | { | |
76 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
77 | ||
78 | /* | |
79 | * The maximum destination buffer size for the encrypt/sign operations | |
80 | * will be the same as for RSA, even though it's smaller for | |
81 | * decrypt/verify. | |
82 | */ | |
83 | ||
84 | return ctx->key_size ?: -EINVAL; | |
85 | } | |
86 | ||
87 | static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len, | |
88 | struct scatterlist *next) | |
89 | { | |
90 | int nsegs = next ? 1 : 0; | |
91 | ||
92 | if (offset_in_page(buf) + len <= PAGE_SIZE) { | |
93 | nsegs += 1; | |
94 | sg_init_table(sg, nsegs); | |
95 | sg_set_buf(sg, buf, len); | |
96 | } else { | |
97 | nsegs += 2; | |
98 | sg_init_table(sg, nsegs); | |
99 | sg_set_buf(sg + 0, buf, PAGE_SIZE - offset_in_page(buf)); | |
100 | sg_set_buf(sg + 1, buf + PAGE_SIZE - offset_in_page(buf), | |
101 | offset_in_page(buf) + len - PAGE_SIZE); | |
102 | } | |
103 | ||
104 | if (next) | |
105 | sg_chain(sg, nsegs, next); | |
106 | } | |
107 | ||
108 | static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err) | |
109 | { | |
110 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
111 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
112 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
113 | uint8_t zeros[ctx->key_size - req_ctx->child_req.dst_len]; | |
114 | ||
115 | if (!err) { | |
116 | if (req_ctx->child_req.dst_len < ctx->key_size) { | |
117 | memset(zeros, 0, sizeof(zeros)); | |
118 | sg_copy_from_buffer(req->dst, | |
119 | sg_nents_for_len(req->dst, | |
120 | sizeof(zeros)), | |
121 | zeros, sizeof(zeros)); | |
122 | } | |
123 | ||
124 | sg_pcopy_from_buffer(req->dst, | |
125 | sg_nents_for_len(req->dst, ctx->key_size), | |
126 | req_ctx->out_buf, req_ctx->child_req.dst_len, | |
127 | sizeof(zeros)); | |
128 | } | |
129 | req->dst_len = ctx->key_size; | |
130 | ||
131 | kfree(req_ctx->in_buf); | |
132 | kzfree(req_ctx->out_buf); | |
133 | ||
134 | return err; | |
135 | } | |
136 | ||
137 | static void pkcs1pad_encrypt_sign_complete_cb( | |
138 | struct crypto_async_request *child_async_req, int err) | |
139 | { | |
140 | struct akcipher_request *req = child_async_req->data; | |
141 | struct crypto_async_request async_req; | |
142 | ||
143 | if (err == -EINPROGRESS) | |
144 | return; | |
145 | ||
146 | async_req.data = req->base.data; | |
147 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
148 | async_req.flags = child_async_req->flags; | |
149 | req->base.complete(&async_req, | |
150 | pkcs1pad_encrypt_sign_complete(req, err)); | |
151 | } | |
152 | ||
153 | static int pkcs1pad_encrypt(struct akcipher_request *req) | |
154 | { | |
155 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
156 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
157 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
158 | int err; | |
159 | unsigned int i, ps_end; | |
160 | ||
161 | if (!ctx->key_size) | |
162 | return -EINVAL; | |
163 | ||
164 | if (req->src_len > ctx->key_size - 11) | |
165 | return -EOVERFLOW; | |
166 | ||
167 | if (req->dst_len < ctx->key_size) { | |
168 | req->dst_len = ctx->key_size; | |
169 | return -EOVERFLOW; | |
170 | } | |
171 | ||
172 | if (ctx->key_size > PAGE_SIZE) | |
173 | return -ENOTSUPP; | |
174 | ||
175 | /* | |
176 | * Replace both input and output to add the padding in the input and | |
177 | * the potential missing leading zeros in the output. | |
178 | */ | |
179 | req_ctx->child_req.src = req_ctx->in_sg; | |
180 | req_ctx->child_req.src_len = ctx->key_size - 1; | |
181 | req_ctx->child_req.dst = req_ctx->out_sg; | |
182 | req_ctx->child_req.dst_len = ctx->key_size; | |
183 | ||
184 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, | |
185 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
186 | GFP_KERNEL : GFP_ATOMIC); | |
187 | if (!req_ctx->in_buf) | |
188 | return -ENOMEM; | |
189 | ||
190 | ps_end = ctx->key_size - req->src_len - 2; | |
191 | req_ctx->in_buf[0] = 0x02; | |
192 | for (i = 1; i < ps_end; i++) | |
193 | req_ctx->in_buf[i] = 1 + prandom_u32_max(255); | |
194 | req_ctx->in_buf[ps_end] = 0x00; | |
195 | ||
196 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, | |
197 | ctx->key_size - 1 - req->src_len, req->src); | |
198 | ||
199 | req_ctx->out_buf = kmalloc(ctx->key_size, | |
200 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
201 | GFP_KERNEL : GFP_ATOMIC); | |
202 | if (!req_ctx->out_buf) { | |
203 | kfree(req_ctx->in_buf); | |
204 | return -ENOMEM; | |
205 | } | |
206 | ||
207 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
208 | ctx->key_size, NULL); | |
209 | ||
210 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
211 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
212 | pkcs1pad_encrypt_sign_complete_cb, req); | |
213 | ||
214 | err = crypto_akcipher_encrypt(&req_ctx->child_req); | |
215 | if (err != -EINPROGRESS && | |
216 | (err != -EBUSY || | |
217 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
218 | return pkcs1pad_encrypt_sign_complete(req, err); | |
219 | ||
220 | return err; | |
221 | } | |
222 | ||
223 | static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) | |
224 | { | |
225 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
226 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
227 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
228 | unsigned int pos; | |
229 | ||
230 | if (err == -EOVERFLOW) | |
231 | /* Decrypted value had no leading 0 byte */ | |
232 | err = -EINVAL; | |
233 | ||
234 | if (err) | |
235 | goto done; | |
236 | ||
237 | if (req_ctx->child_req.dst_len != ctx->key_size - 1) { | |
238 | err = -EINVAL; | |
239 | goto done; | |
240 | } | |
241 | ||
242 | if (req_ctx->out_buf[0] != 0x02) { | |
243 | err = -EINVAL; | |
244 | goto done; | |
245 | } | |
246 | for (pos = 1; pos < req_ctx->child_req.dst_len; pos++) | |
247 | if (req_ctx->out_buf[pos] == 0x00) | |
248 | break; | |
249 | if (pos < 9 || pos == req_ctx->child_req.dst_len) { | |
250 | err = -EINVAL; | |
251 | goto done; | |
252 | } | |
253 | pos++; | |
254 | ||
255 | if (req->dst_len < req_ctx->child_req.dst_len - pos) | |
256 | err = -EOVERFLOW; | |
257 | req->dst_len = req_ctx->child_req.dst_len - pos; | |
258 | ||
259 | if (!err) | |
260 | sg_copy_from_buffer(req->dst, | |
261 | sg_nents_for_len(req->dst, req->dst_len), | |
262 | req_ctx->out_buf + pos, req->dst_len); | |
263 | ||
264 | done: | |
265 | kzfree(req_ctx->out_buf); | |
266 | ||
267 | return err; | |
268 | } | |
269 | ||
270 | static void pkcs1pad_decrypt_complete_cb( | |
271 | struct crypto_async_request *child_async_req, int err) | |
272 | { | |
273 | struct akcipher_request *req = child_async_req->data; | |
274 | struct crypto_async_request async_req; | |
275 | ||
276 | if (err == -EINPROGRESS) | |
277 | return; | |
278 | ||
279 | async_req.data = req->base.data; | |
280 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
281 | async_req.flags = child_async_req->flags; | |
282 | req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err)); | |
283 | } | |
284 | ||
285 | static int pkcs1pad_decrypt(struct akcipher_request *req) | |
286 | { | |
287 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
288 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
289 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
290 | int err; | |
291 | ||
292 | if (!ctx->key_size || req->src_len != ctx->key_size) | |
293 | return -EINVAL; | |
294 | ||
295 | if (ctx->key_size > PAGE_SIZE) | |
296 | return -ENOTSUPP; | |
297 | ||
298 | /* Reuse input buffer, output to a new buffer */ | |
299 | req_ctx->child_req.src = req->src; | |
300 | req_ctx->child_req.src_len = req->src_len; | |
301 | req_ctx->child_req.dst = req_ctx->out_sg; | |
302 | req_ctx->child_req.dst_len = ctx->key_size - 1; | |
303 | ||
304 | req_ctx->out_buf = kmalloc(ctx->key_size - 1, | |
305 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
306 | GFP_KERNEL : GFP_ATOMIC); | |
307 | if (!req_ctx->out_buf) | |
308 | return -ENOMEM; | |
309 | ||
310 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
311 | ctx->key_size - 1, NULL); | |
312 | ||
313 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
314 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
315 | pkcs1pad_decrypt_complete_cb, req); | |
316 | ||
317 | err = crypto_akcipher_decrypt(&req_ctx->child_req); | |
318 | if (err != -EINPROGRESS && | |
319 | (err != -EBUSY || | |
320 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
321 | return pkcs1pad_decrypt_complete(req, err); | |
322 | ||
323 | return err; | |
324 | } | |
325 | ||
326 | static int pkcs1pad_sign(struct akcipher_request *req) | |
327 | { | |
328 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
329 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
330 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
331 | int err; | |
332 | unsigned int ps_end; | |
333 | ||
334 | if (!ctx->key_size) | |
335 | return -EINVAL; | |
336 | ||
337 | if (req->src_len > ctx->key_size - 11) | |
338 | return -EOVERFLOW; | |
339 | ||
340 | if (req->dst_len < ctx->key_size) { | |
341 | req->dst_len = ctx->key_size; | |
342 | return -EOVERFLOW; | |
343 | } | |
344 | ||
345 | if (ctx->key_size > PAGE_SIZE) | |
346 | return -ENOTSUPP; | |
347 | ||
348 | /* | |
349 | * Replace both input and output to add the padding in the input and | |
350 | * the potential missing leading zeros in the output. | |
351 | */ | |
352 | req_ctx->child_req.src = req_ctx->in_sg; | |
353 | req_ctx->child_req.src_len = ctx->key_size - 1; | |
354 | req_ctx->child_req.dst = req_ctx->out_sg; | |
355 | req_ctx->child_req.dst_len = ctx->key_size; | |
356 | ||
357 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, | |
358 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
359 | GFP_KERNEL : GFP_ATOMIC); | |
360 | if (!req_ctx->in_buf) | |
361 | return -ENOMEM; | |
362 | ||
363 | ps_end = ctx->key_size - req->src_len - 2; | |
364 | req_ctx->in_buf[0] = 0x01; | |
365 | memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); | |
366 | req_ctx->in_buf[ps_end] = 0x00; | |
367 | ||
368 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, | |
369 | ctx->key_size - 1 - req->src_len, req->src); | |
370 | ||
371 | req_ctx->out_buf = kmalloc(ctx->key_size, | |
372 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
373 | GFP_KERNEL : GFP_ATOMIC); | |
374 | if (!req_ctx->out_buf) { | |
375 | kfree(req_ctx->in_buf); | |
376 | return -ENOMEM; | |
377 | } | |
378 | ||
379 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
380 | ctx->key_size, NULL); | |
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_encrypt_sign_complete_cb, req); | |
385 | ||
386 | err = crypto_akcipher_sign(&req_ctx->child_req); | |
387 | if (err != -EINPROGRESS && | |
388 | (err != -EBUSY || | |
389 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
390 | return pkcs1pad_encrypt_sign_complete(req, err); | |
391 | ||
392 | return err; | |
393 | } | |
394 | ||
395 | static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) | |
396 | { | |
397 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
398 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
399 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
400 | unsigned int pos; | |
401 | ||
402 | if (err == -EOVERFLOW) | |
403 | /* Decrypted value had no leading 0 byte */ | |
404 | err = -EINVAL; | |
405 | ||
406 | if (err) | |
407 | goto done; | |
408 | ||
409 | if (req_ctx->child_req.dst_len != ctx->key_size - 1) { | |
410 | err = -EINVAL; | |
411 | goto done; | |
412 | } | |
413 | ||
414 | if (req_ctx->out_buf[0] != 0x01) { | |
415 | err = -EINVAL; | |
416 | goto done; | |
417 | } | |
418 | for (pos = 1; pos < req_ctx->child_req.dst_len; pos++) | |
419 | if (req_ctx->out_buf[pos] != 0xff) | |
420 | break; | |
421 | if (pos < 9 || pos == req_ctx->child_req.dst_len || | |
422 | req_ctx->out_buf[pos] != 0x00) { | |
423 | err = -EINVAL; | |
424 | goto done; | |
425 | } | |
426 | pos++; | |
427 | ||
428 | if (req->dst_len < req_ctx->child_req.dst_len - pos) | |
429 | err = -EOVERFLOW; | |
430 | req->dst_len = req_ctx->child_req.dst_len - pos; | |
431 | ||
432 | if (!err) | |
433 | sg_copy_from_buffer(req->dst, | |
434 | sg_nents_for_len(req->dst, req->dst_len), | |
435 | req_ctx->out_buf + pos, req->dst_len); | |
436 | ||
437 | done: | |
438 | kzfree(req_ctx->out_buf); | |
439 | ||
440 | return err; | |
441 | } | |
442 | ||
443 | static void pkcs1pad_verify_complete_cb( | |
444 | struct crypto_async_request *child_async_req, int err) | |
445 | { | |
446 | struct akcipher_request *req = child_async_req->data; | |
447 | struct crypto_async_request async_req; | |
448 | ||
449 | if (err == -EINPROGRESS) | |
450 | return; | |
451 | ||
452 | async_req.data = req->base.data; | |
453 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
454 | async_req.flags = child_async_req->flags; | |
455 | req->base.complete(&async_req, pkcs1pad_verify_complete(req, err)); | |
456 | } | |
457 | ||
458 | /* | |
459 | * The verify operation is here for completeness similar to the verification | |
460 | * defined in RFC2313 section 10.2 except that block type 0 is not accepted, | |
461 | * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to | |
462 | * retrieve the DigestInfo from a signature, instead the user is expected | |
463 | * to call the sign operation to generate the expected signature and compare | |
464 | * signatures instead of the message-digests. | |
465 | */ | |
466 | static int pkcs1pad_verify(struct akcipher_request *req) | |
467 | { | |
468 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
469 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
470 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
471 | int err; | |
472 | ||
473 | if (!ctx->key_size || req->src_len != ctx->key_size) | |
474 | return -EINVAL; | |
475 | ||
476 | if (ctx->key_size > PAGE_SIZE) | |
477 | return -ENOTSUPP; | |
478 | ||
479 | /* Reuse input buffer, output to a new buffer */ | |
480 | req_ctx->child_req.src = req->src; | |
481 | req_ctx->child_req.src_len = req->src_len; | |
482 | req_ctx->child_req.dst = req_ctx->out_sg; | |
483 | req_ctx->child_req.dst_len = ctx->key_size - 1; | |
484 | ||
485 | req_ctx->out_buf = kmalloc(ctx->key_size - 1, | |
486 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
487 | GFP_KERNEL : GFP_ATOMIC); | |
488 | if (!req_ctx->out_buf) | |
489 | return -ENOMEM; | |
490 | ||
491 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
492 | ctx->key_size - 1, NULL); | |
493 | ||
494 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
495 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
496 | pkcs1pad_verify_complete_cb, req); | |
497 | ||
498 | err = crypto_akcipher_verify(&req_ctx->child_req); | |
499 | if (err != -EINPROGRESS && | |
500 | (err != -EBUSY || | |
501 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
502 | return pkcs1pad_verify_complete(req, err); | |
503 | ||
504 | return err; | |
505 | } | |
506 | ||
507 | static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) | |
508 | { | |
509 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); | |
510 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
511 | struct crypto_akcipher *child_tfm; | |
512 | ||
513 | child_tfm = crypto_spawn_akcipher(akcipher_instance_ctx(inst)); | |
514 | if (IS_ERR(child_tfm)) | |
515 | return PTR_ERR(child_tfm); | |
516 | ||
517 | ctx->child = child_tfm; | |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
522 | static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) | |
523 | { | |
524 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
525 | ||
526 | crypto_free_akcipher(ctx->child); | |
527 | } | |
528 | ||
529 | static void pkcs1pad_free(struct akcipher_instance *inst) | |
530 | { | |
531 | struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst); | |
532 | ||
533 | crypto_drop_akcipher(spawn); | |
534 | ||
535 | kfree(inst); | |
536 | } | |
537 | ||
538 | static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) | |
539 | { | |
540 | struct crypto_attr_type *algt; | |
541 | struct akcipher_instance *inst; | |
542 | struct crypto_akcipher_spawn *spawn; | |
543 | struct akcipher_alg *rsa_alg; | |
544 | const char *rsa_alg_name; | |
545 | int err; | |
546 | ||
547 | algt = crypto_get_attr_type(tb); | |
548 | if (IS_ERR(algt)) | |
549 | return PTR_ERR(algt); | |
550 | ||
551 | if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask) | |
552 | return -EINVAL; | |
553 | ||
554 | rsa_alg_name = crypto_attr_alg_name(tb[1]); | |
555 | if (IS_ERR(rsa_alg_name)) | |
556 | return PTR_ERR(rsa_alg_name); | |
557 | ||
558 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
559 | if (!inst) | |
560 | return -ENOMEM; | |
561 | ||
562 | spawn = akcipher_instance_ctx(inst); | |
563 | crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst)); | |
564 | err = crypto_grab_akcipher(spawn, rsa_alg_name, 0, | |
565 | crypto_requires_sync(algt->type, algt->mask)); | |
566 | if (err) | |
567 | goto out_free_inst; | |
568 | ||
569 | rsa_alg = crypto_spawn_akcipher_alg(spawn); | |
570 | ||
571 | err = -ENAMETOOLONG; | |
572 | if (snprintf(inst->alg.base.cra_name, | |
573 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
574 | rsa_alg->base.cra_name) >= | |
575 | CRYPTO_MAX_ALG_NAME || | |
576 | snprintf(inst->alg.base.cra_driver_name, | |
577 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
578 | rsa_alg->base.cra_driver_name) >= | |
579 | CRYPTO_MAX_ALG_NAME) | |
580 | goto out_drop_alg; | |
581 | ||
582 | inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC; | |
583 | inst->alg.base.cra_priority = rsa_alg->base.cra_priority; | |
584 | inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); | |
585 | ||
586 | inst->alg.init = pkcs1pad_init_tfm; | |
587 | inst->alg.exit = pkcs1pad_exit_tfm; | |
588 | ||
589 | inst->alg.encrypt = pkcs1pad_encrypt; | |
590 | inst->alg.decrypt = pkcs1pad_decrypt; | |
591 | inst->alg.sign = pkcs1pad_sign; | |
592 | inst->alg.verify = pkcs1pad_verify; | |
593 | inst->alg.set_pub_key = pkcs1pad_set_pub_key; | |
594 | inst->alg.set_priv_key = pkcs1pad_set_priv_key; | |
595 | inst->alg.max_size = pkcs1pad_get_max_size; | |
596 | inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize; | |
597 | ||
598 | inst->free = pkcs1pad_free; | |
599 | ||
600 | err = akcipher_register_instance(tmpl, inst); | |
601 | if (err) | |
602 | goto out_drop_alg; | |
603 | ||
604 | return 0; | |
605 | ||
606 | out_drop_alg: | |
607 | crypto_drop_akcipher(spawn); | |
608 | out_free_inst: | |
609 | kfree(inst); | |
610 | return err; | |
611 | } | |
612 | ||
613 | struct crypto_template rsa_pkcs1pad_tmpl = { | |
614 | .name = "pkcs1pad", | |
615 | .create = pkcs1pad_create, | |
616 | .module = THIS_MODULE, | |
617 | }; |