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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); | |
5319216d AZ |
113 | size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len; |
114 | size_t chunk_len, pad_left; | |
115 | struct sg_mapping_iter miter; | |
3d5b1ecd AZ |
116 | |
117 | if (!err) { | |
5319216d AZ |
118 | if (pad_len) { |
119 | sg_miter_start(&miter, req->dst, | |
120 | sg_nents_for_len(req->dst, pad_len), | |
121 | SG_MITER_ATOMIC | SG_MITER_TO_SG); | |
122 | ||
123 | pad_left = pad_len; | |
124 | while (pad_left) { | |
125 | sg_miter_next(&miter); | |
126 | ||
127 | chunk_len = min(miter.length, pad_left); | |
128 | memset(miter.addr, 0, chunk_len); | |
129 | pad_left -= chunk_len; | |
130 | } | |
131 | ||
132 | sg_miter_stop(&miter); | |
3d5b1ecd AZ |
133 | } |
134 | ||
135 | sg_pcopy_from_buffer(req->dst, | |
136 | sg_nents_for_len(req->dst, ctx->key_size), | |
137 | req_ctx->out_buf, req_ctx->child_req.dst_len, | |
5319216d | 138 | pad_len); |
3d5b1ecd AZ |
139 | } |
140 | req->dst_len = ctx->key_size; | |
141 | ||
142 | kfree(req_ctx->in_buf); | |
143 | kzfree(req_ctx->out_buf); | |
144 | ||
145 | return err; | |
146 | } | |
147 | ||
148 | static void pkcs1pad_encrypt_sign_complete_cb( | |
149 | struct crypto_async_request *child_async_req, int err) | |
150 | { | |
151 | struct akcipher_request *req = child_async_req->data; | |
152 | struct crypto_async_request async_req; | |
153 | ||
154 | if (err == -EINPROGRESS) | |
155 | return; | |
156 | ||
157 | async_req.data = req->base.data; | |
158 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
159 | async_req.flags = child_async_req->flags; | |
160 | req->base.complete(&async_req, | |
161 | pkcs1pad_encrypt_sign_complete(req, err)); | |
162 | } | |
163 | ||
164 | static int pkcs1pad_encrypt(struct akcipher_request *req) | |
165 | { | |
166 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
167 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
168 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
169 | int err; | |
170 | unsigned int i, ps_end; | |
171 | ||
172 | if (!ctx->key_size) | |
173 | return -EINVAL; | |
174 | ||
175 | if (req->src_len > ctx->key_size - 11) | |
176 | return -EOVERFLOW; | |
177 | ||
178 | if (req->dst_len < ctx->key_size) { | |
179 | req->dst_len = ctx->key_size; | |
180 | return -EOVERFLOW; | |
181 | } | |
182 | ||
183 | if (ctx->key_size > PAGE_SIZE) | |
184 | return -ENOTSUPP; | |
185 | ||
186 | /* | |
187 | * Replace both input and output to add the padding in the input and | |
188 | * the potential missing leading zeros in the output. | |
189 | */ | |
190 | req_ctx->child_req.src = req_ctx->in_sg; | |
191 | req_ctx->child_req.src_len = ctx->key_size - 1; | |
192 | req_ctx->child_req.dst = req_ctx->out_sg; | |
193 | req_ctx->child_req.dst_len = ctx->key_size; | |
194 | ||
195 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, | |
196 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
197 | GFP_KERNEL : GFP_ATOMIC); | |
198 | if (!req_ctx->in_buf) | |
199 | return -ENOMEM; | |
200 | ||
201 | ps_end = ctx->key_size - req->src_len - 2; | |
202 | req_ctx->in_buf[0] = 0x02; | |
203 | for (i = 1; i < ps_end; i++) | |
204 | req_ctx->in_buf[i] = 1 + prandom_u32_max(255); | |
205 | req_ctx->in_buf[ps_end] = 0x00; | |
206 | ||
207 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, | |
208 | ctx->key_size - 1 - req->src_len, req->src); | |
209 | ||
210 | req_ctx->out_buf = kmalloc(ctx->key_size, | |
211 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
212 | GFP_KERNEL : GFP_ATOMIC); | |
213 | if (!req_ctx->out_buf) { | |
214 | kfree(req_ctx->in_buf); | |
215 | return -ENOMEM; | |
216 | } | |
217 | ||
218 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
219 | ctx->key_size, NULL); | |
220 | ||
221 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
222 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
223 | pkcs1pad_encrypt_sign_complete_cb, req); | |
224 | ||
225 | err = crypto_akcipher_encrypt(&req_ctx->child_req); | |
226 | if (err != -EINPROGRESS && | |
227 | (err != -EBUSY || | |
228 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
229 | return pkcs1pad_encrypt_sign_complete(req, err); | |
230 | ||
231 | return err; | |
232 | } | |
233 | ||
234 | static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) | |
235 | { | |
236 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
237 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
238 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
239 | unsigned int pos; | |
240 | ||
241 | if (err == -EOVERFLOW) | |
242 | /* Decrypted value had no leading 0 byte */ | |
243 | err = -EINVAL; | |
244 | ||
245 | if (err) | |
246 | goto done; | |
247 | ||
248 | if (req_ctx->child_req.dst_len != ctx->key_size - 1) { | |
249 | err = -EINVAL; | |
250 | goto done; | |
251 | } | |
252 | ||
253 | if (req_ctx->out_buf[0] != 0x02) { | |
254 | err = -EINVAL; | |
255 | goto done; | |
256 | } | |
257 | for (pos = 1; pos < req_ctx->child_req.dst_len; pos++) | |
258 | if (req_ctx->out_buf[pos] == 0x00) | |
259 | break; | |
260 | if (pos < 9 || pos == req_ctx->child_req.dst_len) { | |
261 | err = -EINVAL; | |
262 | goto done; | |
263 | } | |
264 | pos++; | |
265 | ||
266 | if (req->dst_len < req_ctx->child_req.dst_len - pos) | |
267 | err = -EOVERFLOW; | |
268 | req->dst_len = req_ctx->child_req.dst_len - pos; | |
269 | ||
270 | if (!err) | |
271 | sg_copy_from_buffer(req->dst, | |
272 | sg_nents_for_len(req->dst, req->dst_len), | |
273 | req_ctx->out_buf + pos, req->dst_len); | |
274 | ||
275 | done: | |
276 | kzfree(req_ctx->out_buf); | |
277 | ||
278 | return err; | |
279 | } | |
280 | ||
281 | static void pkcs1pad_decrypt_complete_cb( | |
282 | struct crypto_async_request *child_async_req, int err) | |
283 | { | |
284 | struct akcipher_request *req = child_async_req->data; | |
285 | struct crypto_async_request async_req; | |
286 | ||
287 | if (err == -EINPROGRESS) | |
288 | return; | |
289 | ||
290 | async_req.data = req->base.data; | |
291 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
292 | async_req.flags = child_async_req->flags; | |
293 | req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err)); | |
294 | } | |
295 | ||
296 | static int pkcs1pad_decrypt(struct akcipher_request *req) | |
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); | |
301 | int err; | |
302 | ||
303 | if (!ctx->key_size || req->src_len != ctx->key_size) | |
304 | return -EINVAL; | |
305 | ||
306 | if (ctx->key_size > PAGE_SIZE) | |
307 | return -ENOTSUPP; | |
308 | ||
309 | /* Reuse input buffer, output to a new buffer */ | |
310 | req_ctx->child_req.src = req->src; | |
311 | req_ctx->child_req.src_len = req->src_len; | |
312 | req_ctx->child_req.dst = req_ctx->out_sg; | |
313 | req_ctx->child_req.dst_len = ctx->key_size - 1; | |
314 | ||
315 | req_ctx->out_buf = kmalloc(ctx->key_size - 1, | |
316 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
317 | GFP_KERNEL : GFP_ATOMIC); | |
318 | if (!req_ctx->out_buf) | |
319 | return -ENOMEM; | |
320 | ||
321 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
322 | ctx->key_size - 1, NULL); | |
323 | ||
324 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
325 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
326 | pkcs1pad_decrypt_complete_cb, req); | |
327 | ||
328 | err = crypto_akcipher_decrypt(&req_ctx->child_req); | |
329 | if (err != -EINPROGRESS && | |
330 | (err != -EBUSY || | |
331 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
332 | return pkcs1pad_decrypt_complete(req, err); | |
333 | ||
334 | return err; | |
335 | } | |
336 | ||
337 | static int pkcs1pad_sign(struct akcipher_request *req) | |
338 | { | |
339 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
340 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
341 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
342 | int err; | |
343 | unsigned int ps_end; | |
344 | ||
345 | if (!ctx->key_size) | |
346 | return -EINVAL; | |
347 | ||
348 | if (req->src_len > ctx->key_size - 11) | |
349 | return -EOVERFLOW; | |
350 | ||
351 | if (req->dst_len < ctx->key_size) { | |
352 | req->dst_len = ctx->key_size; | |
353 | return -EOVERFLOW; | |
354 | } | |
355 | ||
356 | if (ctx->key_size > PAGE_SIZE) | |
357 | return -ENOTSUPP; | |
358 | ||
359 | /* | |
360 | * Replace both input and output to add the padding in the input and | |
361 | * the potential missing leading zeros in the output. | |
362 | */ | |
363 | req_ctx->child_req.src = req_ctx->in_sg; | |
364 | req_ctx->child_req.src_len = ctx->key_size - 1; | |
365 | req_ctx->child_req.dst = req_ctx->out_sg; | |
366 | req_ctx->child_req.dst_len = ctx->key_size; | |
367 | ||
368 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, | |
369 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
370 | GFP_KERNEL : GFP_ATOMIC); | |
371 | if (!req_ctx->in_buf) | |
372 | return -ENOMEM; | |
373 | ||
374 | ps_end = ctx->key_size - req->src_len - 2; | |
375 | req_ctx->in_buf[0] = 0x01; | |
376 | memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); | |
377 | req_ctx->in_buf[ps_end] = 0x00; | |
378 | ||
379 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, | |
380 | ctx->key_size - 1 - req->src_len, req->src); | |
381 | ||
382 | req_ctx->out_buf = kmalloc(ctx->key_size, | |
383 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
384 | GFP_KERNEL : GFP_ATOMIC); | |
385 | if (!req_ctx->out_buf) { | |
386 | kfree(req_ctx->in_buf); | |
387 | return -ENOMEM; | |
388 | } | |
389 | ||
390 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
391 | ctx->key_size, NULL); | |
392 | ||
393 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
394 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
395 | pkcs1pad_encrypt_sign_complete_cb, req); | |
396 | ||
397 | err = crypto_akcipher_sign(&req_ctx->child_req); | |
398 | if (err != -EINPROGRESS && | |
399 | (err != -EBUSY || | |
400 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
401 | return pkcs1pad_encrypt_sign_complete(req, err); | |
402 | ||
403 | return err; | |
404 | } | |
405 | ||
406 | static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) | |
407 | { | |
408 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
409 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
410 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
411 | unsigned int pos; | |
412 | ||
413 | if (err == -EOVERFLOW) | |
414 | /* Decrypted value had no leading 0 byte */ | |
415 | err = -EINVAL; | |
416 | ||
417 | if (err) | |
418 | goto done; | |
419 | ||
420 | if (req_ctx->child_req.dst_len != ctx->key_size - 1) { | |
421 | err = -EINVAL; | |
422 | goto done; | |
423 | } | |
424 | ||
425 | if (req_ctx->out_buf[0] != 0x01) { | |
426 | err = -EINVAL; | |
427 | goto done; | |
428 | } | |
429 | for (pos = 1; pos < req_ctx->child_req.dst_len; pos++) | |
430 | if (req_ctx->out_buf[pos] != 0xff) | |
431 | break; | |
432 | if (pos < 9 || pos == req_ctx->child_req.dst_len || | |
433 | req_ctx->out_buf[pos] != 0x00) { | |
434 | err = -EINVAL; | |
435 | goto done; | |
436 | } | |
437 | pos++; | |
438 | ||
439 | if (req->dst_len < req_ctx->child_req.dst_len - pos) | |
440 | err = -EOVERFLOW; | |
441 | req->dst_len = req_ctx->child_req.dst_len - pos; | |
442 | ||
443 | if (!err) | |
444 | sg_copy_from_buffer(req->dst, | |
445 | sg_nents_for_len(req->dst, req->dst_len), | |
446 | req_ctx->out_buf + pos, req->dst_len); | |
447 | ||
448 | done: | |
449 | kzfree(req_ctx->out_buf); | |
450 | ||
451 | return err; | |
452 | } | |
453 | ||
454 | static void pkcs1pad_verify_complete_cb( | |
455 | struct crypto_async_request *child_async_req, int err) | |
456 | { | |
457 | struct akcipher_request *req = child_async_req->data; | |
458 | struct crypto_async_request async_req; | |
459 | ||
460 | if (err == -EINPROGRESS) | |
461 | return; | |
462 | ||
463 | async_req.data = req->base.data; | |
464 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
465 | async_req.flags = child_async_req->flags; | |
466 | req->base.complete(&async_req, pkcs1pad_verify_complete(req, err)); | |
467 | } | |
468 | ||
469 | /* | |
470 | * The verify operation is here for completeness similar to the verification | |
471 | * defined in RFC2313 section 10.2 except that block type 0 is not accepted, | |
472 | * as in RFC2437. RFC2437 section 9.2 doesn't define any operation to | |
473 | * retrieve the DigestInfo from a signature, instead the user is expected | |
474 | * to call the sign operation to generate the expected signature and compare | |
475 | * signatures instead of the message-digests. | |
476 | */ | |
477 | static int pkcs1pad_verify(struct akcipher_request *req) | |
478 | { | |
479 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
480 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
481 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
482 | int err; | |
483 | ||
484 | if (!ctx->key_size || req->src_len != ctx->key_size) | |
485 | return -EINVAL; | |
486 | ||
487 | if (ctx->key_size > PAGE_SIZE) | |
488 | return -ENOTSUPP; | |
489 | ||
490 | /* Reuse input buffer, output to a new buffer */ | |
491 | req_ctx->child_req.src = req->src; | |
492 | req_ctx->child_req.src_len = req->src_len; | |
493 | req_ctx->child_req.dst = req_ctx->out_sg; | |
494 | req_ctx->child_req.dst_len = ctx->key_size - 1; | |
495 | ||
496 | req_ctx->out_buf = kmalloc(ctx->key_size - 1, | |
497 | (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? | |
498 | GFP_KERNEL : GFP_ATOMIC); | |
499 | if (!req_ctx->out_buf) | |
500 | return -ENOMEM; | |
501 | ||
502 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
503 | ctx->key_size - 1, NULL); | |
504 | ||
505 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
506 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
507 | pkcs1pad_verify_complete_cb, req); | |
508 | ||
509 | err = crypto_akcipher_verify(&req_ctx->child_req); | |
510 | if (err != -EINPROGRESS && | |
511 | (err != -EBUSY || | |
512 | !(req->base.flags & CRYPTO_TFM_REQ_MAY_BACKLOG))) | |
513 | return pkcs1pad_verify_complete(req, err); | |
514 | ||
515 | return err; | |
516 | } | |
517 | ||
518 | static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) | |
519 | { | |
520 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); | |
521 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
522 | struct crypto_akcipher *child_tfm; | |
523 | ||
524 | child_tfm = crypto_spawn_akcipher(akcipher_instance_ctx(inst)); | |
525 | if (IS_ERR(child_tfm)) | |
526 | return PTR_ERR(child_tfm); | |
527 | ||
528 | ctx->child = child_tfm; | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) | |
534 | { | |
535 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
536 | ||
537 | crypto_free_akcipher(ctx->child); | |
538 | } | |
539 | ||
540 | static void pkcs1pad_free(struct akcipher_instance *inst) | |
541 | { | |
542 | struct crypto_akcipher_spawn *spawn = akcipher_instance_ctx(inst); | |
543 | ||
544 | crypto_drop_akcipher(spawn); | |
545 | ||
546 | kfree(inst); | |
547 | } | |
548 | ||
549 | static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) | |
550 | { | |
551 | struct crypto_attr_type *algt; | |
552 | struct akcipher_instance *inst; | |
553 | struct crypto_akcipher_spawn *spawn; | |
554 | struct akcipher_alg *rsa_alg; | |
555 | const char *rsa_alg_name; | |
556 | int err; | |
557 | ||
558 | algt = crypto_get_attr_type(tb); | |
559 | if (IS_ERR(algt)) | |
560 | return PTR_ERR(algt); | |
561 | ||
562 | if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask) | |
563 | return -EINVAL; | |
564 | ||
565 | rsa_alg_name = crypto_attr_alg_name(tb[1]); | |
566 | if (IS_ERR(rsa_alg_name)) | |
567 | return PTR_ERR(rsa_alg_name); | |
568 | ||
569 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
570 | if (!inst) | |
571 | return -ENOMEM; | |
572 | ||
573 | spawn = akcipher_instance_ctx(inst); | |
574 | crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst)); | |
575 | err = crypto_grab_akcipher(spawn, rsa_alg_name, 0, | |
576 | crypto_requires_sync(algt->type, algt->mask)); | |
577 | if (err) | |
578 | goto out_free_inst; | |
579 | ||
580 | rsa_alg = crypto_spawn_akcipher_alg(spawn); | |
581 | ||
582 | err = -ENAMETOOLONG; | |
583 | if (snprintf(inst->alg.base.cra_name, | |
584 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
585 | rsa_alg->base.cra_name) >= | |
586 | CRYPTO_MAX_ALG_NAME || | |
587 | snprintf(inst->alg.base.cra_driver_name, | |
588 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
589 | rsa_alg->base.cra_driver_name) >= | |
590 | CRYPTO_MAX_ALG_NAME) | |
591 | goto out_drop_alg; | |
592 | ||
593 | inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC; | |
594 | inst->alg.base.cra_priority = rsa_alg->base.cra_priority; | |
595 | inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); | |
596 | ||
597 | inst->alg.init = pkcs1pad_init_tfm; | |
598 | inst->alg.exit = pkcs1pad_exit_tfm; | |
599 | ||
600 | inst->alg.encrypt = pkcs1pad_encrypt; | |
601 | inst->alg.decrypt = pkcs1pad_decrypt; | |
602 | inst->alg.sign = pkcs1pad_sign; | |
603 | inst->alg.verify = pkcs1pad_verify; | |
604 | inst->alg.set_pub_key = pkcs1pad_set_pub_key; | |
605 | inst->alg.set_priv_key = pkcs1pad_set_priv_key; | |
606 | inst->alg.max_size = pkcs1pad_get_max_size; | |
607 | inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize; | |
608 | ||
609 | inst->free = pkcs1pad_free; | |
610 | ||
611 | err = akcipher_register_instance(tmpl, inst); | |
612 | if (err) | |
613 | goto out_drop_alg; | |
614 | ||
615 | return 0; | |
616 | ||
617 | out_drop_alg: | |
618 | crypto_drop_akcipher(spawn); | |
619 | out_free_inst: | |
620 | kfree(inst); | |
621 | return err; | |
622 | } | |
623 | ||
624 | struct crypto_template rsa_pkcs1pad_tmpl = { | |
625 | .name = "pkcs1pad", | |
626 | .create = pkcs1pad_create, | |
627 | .module = THIS_MODULE, | |
628 | }; |