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Commit | Line | Data |
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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> | |
a1180cff | 15 | #include <crypto/internal/rsa.h> |
3d5b1ecd AZ |
16 | #include <linux/err.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/random.h> | |
21 | ||
a49de377 TS |
22 | /* |
23 | * Hash algorithm OIDs plus ASN.1 DER wrappings [RFC4880 sec 5.2.2]. | |
24 | */ | |
25 | static const u8 rsa_digest_info_md5[] = { | |
26 | 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, | |
27 | 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, /* OID */ | |
28 | 0x05, 0x00, 0x04, 0x10 | |
29 | }; | |
30 | ||
31 | static const u8 rsa_digest_info_sha1[] = { | |
32 | 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, | |
33 | 0x2b, 0x0e, 0x03, 0x02, 0x1a, | |
34 | 0x05, 0x00, 0x04, 0x14 | |
35 | }; | |
36 | ||
37 | static const u8 rsa_digest_info_rmd160[] = { | |
38 | 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, | |
39 | 0x2b, 0x24, 0x03, 0x02, 0x01, | |
40 | 0x05, 0x00, 0x04, 0x14 | |
41 | }; | |
42 | ||
43 | static const u8 rsa_digest_info_sha224[] = { | |
44 | 0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, | |
45 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, | |
46 | 0x05, 0x00, 0x04, 0x1c | |
47 | }; | |
48 | ||
49 | static const u8 rsa_digest_info_sha256[] = { | |
50 | 0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, | |
51 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, | |
52 | 0x05, 0x00, 0x04, 0x20 | |
53 | }; | |
54 | ||
55 | static const u8 rsa_digest_info_sha384[] = { | |
56 | 0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, | |
57 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, | |
58 | 0x05, 0x00, 0x04, 0x30 | |
59 | }; | |
60 | ||
61 | static const u8 rsa_digest_info_sha512[] = { | |
62 | 0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, | |
63 | 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, | |
64 | 0x05, 0x00, 0x04, 0x40 | |
65 | }; | |
66 | ||
67 | static const struct rsa_asn1_template { | |
68 | const char *name; | |
69 | const u8 *data; | |
70 | size_t size; | |
71 | } rsa_asn1_templates[] = { | |
72 | #define _(X) { #X, rsa_digest_info_##X, sizeof(rsa_digest_info_##X) } | |
73 | _(md5), | |
74 | _(sha1), | |
75 | _(rmd160), | |
76 | _(sha256), | |
77 | _(sha384), | |
78 | _(sha512), | |
79 | _(sha224), | |
80 | { NULL } | |
81 | #undef _ | |
82 | }; | |
83 | ||
84 | static const struct rsa_asn1_template *rsa_lookup_asn1(const char *name) | |
85 | { | |
86 | const struct rsa_asn1_template *p; | |
87 | ||
88 | for (p = rsa_asn1_templates; p->name; p++) | |
89 | if (strcmp(name, p->name) == 0) | |
90 | return p; | |
91 | return NULL; | |
92 | } | |
93 | ||
3d5b1ecd AZ |
94 | struct pkcs1pad_ctx { |
95 | struct crypto_akcipher *child; | |
3d5b1ecd AZ |
96 | unsigned int key_size; |
97 | }; | |
98 | ||
a49de377 TS |
99 | struct pkcs1pad_inst_ctx { |
100 | struct crypto_akcipher_spawn spawn; | |
c0d20d22 | 101 | const struct rsa_asn1_template *digest_info; |
a49de377 TS |
102 | }; |
103 | ||
3d5b1ecd | 104 | struct pkcs1pad_request { |
0f2c8319 | 105 | struct scatterlist in_sg[2], out_sg[1]; |
3d5b1ecd | 106 | uint8_t *in_buf, *out_buf; |
a6d7bfd0 | 107 | struct akcipher_request child_req; |
3d5b1ecd AZ |
108 | }; |
109 | ||
110 | static int pkcs1pad_set_pub_key(struct crypto_akcipher *tfm, const void *key, | |
111 | unsigned int keylen) | |
112 | { | |
113 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
73f79189 HX |
114 | int err; |
115 | ||
116 | ctx->key_size = 0; | |
3d5b1ecd AZ |
117 | |
118 | err = crypto_akcipher_set_pub_key(ctx->child, key, keylen); | |
73f79189 HX |
119 | if (err) |
120 | return err; | |
3d5b1ecd | 121 | |
73f79189 HX |
122 | /* Find out new modulus size from rsa implementation */ |
123 | err = crypto_akcipher_maxsize(ctx->child); | |
73f79189 HX |
124 | if (err > PAGE_SIZE) |
125 | return -ENOTSUPP; | |
3d5b1ecd | 126 | |
73f79189 HX |
127 | ctx->key_size = err; |
128 | return 0; | |
3d5b1ecd AZ |
129 | } |
130 | ||
131 | static int pkcs1pad_set_priv_key(struct crypto_akcipher *tfm, const void *key, | |
132 | unsigned int keylen) | |
133 | { | |
134 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
73f79189 HX |
135 | int err; |
136 | ||
137 | ctx->key_size = 0; | |
3d5b1ecd AZ |
138 | |
139 | err = crypto_akcipher_set_priv_key(ctx->child, key, keylen); | |
73f79189 HX |
140 | if (err) |
141 | return err; | |
3d5b1ecd | 142 | |
73f79189 HX |
143 | /* Find out new modulus size from rsa implementation */ |
144 | err = crypto_akcipher_maxsize(ctx->child); | |
73f79189 HX |
145 | if (err > PAGE_SIZE) |
146 | return -ENOTSUPP; | |
3d5b1ecd | 147 | |
73f79189 HX |
148 | ctx->key_size = err; |
149 | return 0; | |
3d5b1ecd AZ |
150 | } |
151 | ||
543de102 | 152 | static unsigned int pkcs1pad_get_max_size(struct crypto_akcipher *tfm) |
3d5b1ecd AZ |
153 | { |
154 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
155 | ||
156 | /* | |
157 | * The maximum destination buffer size for the encrypt/sign operations | |
158 | * will be the same as for RSA, even though it's smaller for | |
159 | * decrypt/verify. | |
160 | */ | |
161 | ||
543de102 | 162 | return ctx->key_size; |
3d5b1ecd AZ |
163 | } |
164 | ||
165 | static void pkcs1pad_sg_set_buf(struct scatterlist *sg, void *buf, size_t len, | |
166 | struct scatterlist *next) | |
167 | { | |
0f2c8319 HX |
168 | int nsegs = next ? 2 : 1; |
169 | ||
170 | sg_init_table(sg, nsegs); | |
171 | sg_set_buf(sg, buf, len); | |
3d5b1ecd AZ |
172 | |
173 | if (next) | |
174 | sg_chain(sg, nsegs, next); | |
175 | } | |
176 | ||
177 | static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err) | |
178 | { | |
179 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
180 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
181 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
d858b071 HX |
182 | unsigned int pad_len; |
183 | unsigned int len; | |
184 | u8 *out_buf; | |
185 | ||
186 | if (err) | |
187 | goto out; | |
188 | ||
189 | len = req_ctx->child_req.dst_len; | |
190 | pad_len = ctx->key_size - len; | |
191 | ||
192 | /* Four billion to one */ | |
193 | if (likely(!pad_len)) | |
194 | goto out; | |
195 | ||
1ca28098 | 196 | out_buf = kzalloc(ctx->key_size, GFP_KERNEL); |
d858b071 HX |
197 | err = -ENOMEM; |
198 | if (!out_buf) | |
199 | goto out; | |
200 | ||
201 | sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len), | |
202 | out_buf + pad_len, len); | |
203 | sg_copy_from_buffer(req->dst, | |
204 | sg_nents_for_len(req->dst, ctx->key_size), | |
205 | out_buf, ctx->key_size); | |
206 | kzfree(out_buf); | |
207 | ||
208 | out: | |
3d5b1ecd AZ |
209 | req->dst_len = ctx->key_size; |
210 | ||
211 | kfree(req_ctx->in_buf); | |
3d5b1ecd AZ |
212 | |
213 | return err; | |
214 | } | |
215 | ||
216 | static void pkcs1pad_encrypt_sign_complete_cb( | |
217 | struct crypto_async_request *child_async_req, int err) | |
218 | { | |
219 | struct akcipher_request *req = child_async_req->data; | |
220 | struct crypto_async_request async_req; | |
221 | ||
222 | if (err == -EINPROGRESS) | |
223 | return; | |
224 | ||
225 | async_req.data = req->base.data; | |
226 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
227 | async_req.flags = child_async_req->flags; | |
228 | req->base.complete(&async_req, | |
229 | pkcs1pad_encrypt_sign_complete(req, err)); | |
230 | } | |
231 | ||
232 | static int pkcs1pad_encrypt(struct akcipher_request *req) | |
233 | { | |
234 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
235 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
236 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
237 | int err; | |
238 | unsigned int i, ps_end; | |
239 | ||
240 | if (!ctx->key_size) | |
241 | return -EINVAL; | |
242 | ||
243 | if (req->src_len > ctx->key_size - 11) | |
244 | return -EOVERFLOW; | |
245 | ||
246 | if (req->dst_len < ctx->key_size) { | |
247 | req->dst_len = ctx->key_size; | |
248 | return -EOVERFLOW; | |
249 | } | |
250 | ||
3d5b1ecd | 251 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, |
3a32ce50 | 252 | GFP_KERNEL); |
3d5b1ecd AZ |
253 | if (!req_ctx->in_buf) |
254 | return -ENOMEM; | |
255 | ||
256 | ps_end = ctx->key_size - req->src_len - 2; | |
257 | req_ctx->in_buf[0] = 0x02; | |
258 | for (i = 1; i < ps_end; i++) | |
259 | req_ctx->in_buf[i] = 1 + prandom_u32_max(255); | |
260 | req_ctx->in_buf[ps_end] = 0x00; | |
261 | ||
262 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, | |
263 | ctx->key_size - 1 - req->src_len, req->src); | |
264 | ||
3d5b1ecd AZ |
265 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); |
266 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
267 | pkcs1pad_encrypt_sign_complete_cb, req); | |
268 | ||
d858b071 HX |
269 | /* Reuse output buffer */ |
270 | akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, | |
271 | req->dst, ctx->key_size - 1, req->dst_len); | |
272 | ||
3d5b1ecd | 273 | err = crypto_akcipher_encrypt(&req_ctx->child_req); |
4e5b0ad5 | 274 | if (err != -EINPROGRESS && err != -EBUSY) |
3d5b1ecd AZ |
275 | return pkcs1pad_encrypt_sign_complete(req, err); |
276 | ||
277 | return err; | |
278 | } | |
279 | ||
280 | static int pkcs1pad_decrypt_complete(struct akcipher_request *req, int err) | |
281 | { | |
282 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
283 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
284 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
0cf43f50 | 285 | unsigned int dst_len; |
3d5b1ecd | 286 | unsigned int pos; |
0cf43f50 | 287 | u8 *out_buf; |
3d5b1ecd AZ |
288 | |
289 | if (err) | |
290 | goto done; | |
291 | ||
0cf43f50 HX |
292 | err = -EINVAL; |
293 | dst_len = req_ctx->child_req.dst_len; | |
294 | if (dst_len < ctx->key_size - 1) | |
3d5b1ecd | 295 | goto done; |
0cf43f50 HX |
296 | |
297 | out_buf = req_ctx->out_buf; | |
298 | if (dst_len == ctx->key_size) { | |
299 | if (out_buf[0] != 0x00) | |
300 | /* Decrypted value had no leading 0 byte */ | |
301 | goto done; | |
302 | ||
303 | dst_len--; | |
304 | out_buf++; | |
3d5b1ecd AZ |
305 | } |
306 | ||
0cf43f50 | 307 | if (out_buf[0] != 0x02) |
3d5b1ecd | 308 | goto done; |
0cf43f50 HX |
309 | |
310 | for (pos = 1; pos < dst_len; pos++) | |
311 | if (out_buf[pos] == 0x00) | |
3d5b1ecd | 312 | break; |
0cf43f50 | 313 | if (pos < 9 || pos == dst_len) |
3d5b1ecd | 314 | goto done; |
3d5b1ecd AZ |
315 | pos++; |
316 | ||
0cf43f50 HX |
317 | err = 0; |
318 | ||
319 | if (req->dst_len < dst_len - pos) | |
3d5b1ecd | 320 | err = -EOVERFLOW; |
0cf43f50 | 321 | req->dst_len = dst_len - pos; |
3d5b1ecd AZ |
322 | |
323 | if (!err) | |
324 | sg_copy_from_buffer(req->dst, | |
325 | sg_nents_for_len(req->dst, req->dst_len), | |
0cf43f50 | 326 | out_buf + pos, req->dst_len); |
3d5b1ecd AZ |
327 | |
328 | done: | |
329 | kzfree(req_ctx->out_buf); | |
330 | ||
331 | return err; | |
332 | } | |
333 | ||
334 | static void pkcs1pad_decrypt_complete_cb( | |
335 | struct crypto_async_request *child_async_req, int err) | |
336 | { | |
337 | struct akcipher_request *req = child_async_req->data; | |
338 | struct crypto_async_request async_req; | |
339 | ||
340 | if (err == -EINPROGRESS) | |
341 | return; | |
342 | ||
343 | async_req.data = req->base.data; | |
344 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
345 | async_req.flags = child_async_req->flags; | |
346 | req->base.complete(&async_req, pkcs1pad_decrypt_complete(req, err)); | |
347 | } | |
348 | ||
349 | static int pkcs1pad_decrypt(struct akcipher_request *req) | |
350 | { | |
351 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
352 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
353 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
354 | int err; | |
355 | ||
356 | if (!ctx->key_size || req->src_len != ctx->key_size) | |
357 | return -EINVAL; | |
358 | ||
3a32ce50 | 359 | req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); |
3d5b1ecd AZ |
360 | if (!req_ctx->out_buf) |
361 | return -ENOMEM; | |
362 | ||
363 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
6f0904ad | 364 | ctx->key_size, NULL); |
3d5b1ecd AZ |
365 | |
366 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
367 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
368 | pkcs1pad_decrypt_complete_cb, req); | |
369 | ||
d858b071 HX |
370 | /* Reuse input buffer, output to a new buffer */ |
371 | akcipher_request_set_crypt(&req_ctx->child_req, req->src, | |
372 | req_ctx->out_sg, req->src_len, | |
373 | ctx->key_size); | |
374 | ||
3d5b1ecd | 375 | err = crypto_akcipher_decrypt(&req_ctx->child_req); |
4e5b0ad5 | 376 | if (err != -EINPROGRESS && err != -EBUSY) |
3d5b1ecd AZ |
377 | return pkcs1pad_decrypt_complete(req, err); |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
382 | static int pkcs1pad_sign(struct akcipher_request *req) | |
383 | { | |
384 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
385 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
386 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
c0d20d22 HX |
387 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); |
388 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); | |
389 | const struct rsa_asn1_template *digest_info = ictx->digest_info; | |
3d5b1ecd | 390 | int err; |
a49de377 | 391 | unsigned int ps_end, digest_size = 0; |
3d5b1ecd AZ |
392 | |
393 | if (!ctx->key_size) | |
394 | return -EINVAL; | |
395 | ||
b3a8c8a5 DK |
396 | if (digest_info) |
397 | digest_size = digest_info->size; | |
a49de377 TS |
398 | |
399 | if (req->src_len + digest_size > ctx->key_size - 11) | |
3d5b1ecd AZ |
400 | return -EOVERFLOW; |
401 | ||
402 | if (req->dst_len < ctx->key_size) { | |
403 | req->dst_len = ctx->key_size; | |
404 | return -EOVERFLOW; | |
405 | } | |
406 | ||
3d5b1ecd | 407 | req_ctx->in_buf = kmalloc(ctx->key_size - 1 - req->src_len, |
3a32ce50 | 408 | GFP_KERNEL); |
3d5b1ecd AZ |
409 | if (!req_ctx->in_buf) |
410 | return -ENOMEM; | |
411 | ||
a49de377 | 412 | ps_end = ctx->key_size - digest_size - req->src_len - 2; |
3d5b1ecd AZ |
413 | req_ctx->in_buf[0] = 0x01; |
414 | memset(req_ctx->in_buf + 1, 0xff, ps_end - 1); | |
415 | req_ctx->in_buf[ps_end] = 0x00; | |
416 | ||
b3a8c8a5 DK |
417 | if (digest_info) |
418 | memcpy(req_ctx->in_buf + ps_end + 1, digest_info->data, | |
419 | digest_info->size); | |
a49de377 | 420 | |
3d5b1ecd AZ |
421 | pkcs1pad_sg_set_buf(req_ctx->in_sg, req_ctx->in_buf, |
422 | ctx->key_size - 1 - req->src_len, req->src); | |
423 | ||
3d5b1ecd AZ |
424 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); |
425 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
426 | pkcs1pad_encrypt_sign_complete_cb, req); | |
427 | ||
d858b071 HX |
428 | /* Reuse output buffer */ |
429 | akcipher_request_set_crypt(&req_ctx->child_req, req_ctx->in_sg, | |
430 | req->dst, ctx->key_size - 1, req->dst_len); | |
431 | ||
3ecc9725 | 432 | err = crypto_akcipher_decrypt(&req_ctx->child_req); |
4e5b0ad5 | 433 | if (err != -EINPROGRESS && err != -EBUSY) |
3d5b1ecd AZ |
434 | return pkcs1pad_encrypt_sign_complete(req, err); |
435 | ||
436 | return err; | |
437 | } | |
438 | ||
439 | static int pkcs1pad_verify_complete(struct akcipher_request *req, int err) | |
440 | { | |
441 | struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req); | |
442 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
443 | struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req); | |
c0d20d22 HX |
444 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); |
445 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); | |
446 | const struct rsa_asn1_template *digest_info = ictx->digest_info; | |
27710b8e | 447 | unsigned int dst_len; |
3d5b1ecd | 448 | unsigned int pos; |
27710b8e | 449 | u8 *out_buf; |
3d5b1ecd AZ |
450 | |
451 | if (err) | |
452 | goto done; | |
453 | ||
27710b8e HX |
454 | err = -EINVAL; |
455 | dst_len = req_ctx->child_req.dst_len; | |
456 | if (dst_len < ctx->key_size - 1) | |
3d5b1ecd | 457 | goto done; |
27710b8e HX |
458 | |
459 | out_buf = req_ctx->out_buf; | |
460 | if (dst_len == ctx->key_size) { | |
461 | if (out_buf[0] != 0x00) | |
462 | /* Decrypted value had no leading 0 byte */ | |
463 | goto done; | |
464 | ||
465 | dst_len--; | |
466 | out_buf++; | |
3d5b1ecd AZ |
467 | } |
468 | ||
a49de377 | 469 | err = -EBADMSG; |
27710b8e | 470 | if (out_buf[0] != 0x01) |
3d5b1ecd | 471 | goto done; |
a49de377 | 472 | |
27710b8e HX |
473 | for (pos = 1; pos < dst_len; pos++) |
474 | if (out_buf[pos] != 0xff) | |
3d5b1ecd | 475 | break; |
a49de377 | 476 | |
27710b8e | 477 | if (pos < 9 || pos == dst_len || out_buf[pos] != 0x00) |
3d5b1ecd | 478 | goto done; |
3d5b1ecd AZ |
479 | pos++; |
480 | ||
b3a8c8a5 DK |
481 | if (digest_info) { |
482 | if (crypto_memneq(out_buf + pos, digest_info->data, | |
483 | digest_info->size)) | |
484 | goto done; | |
a49de377 | 485 | |
b3a8c8a5 DK |
486 | pos += digest_info->size; |
487 | } | |
a49de377 TS |
488 | |
489 | err = 0; | |
490 | ||
27710b8e | 491 | if (req->dst_len < dst_len - pos) |
3d5b1ecd | 492 | err = -EOVERFLOW; |
27710b8e | 493 | req->dst_len = dst_len - pos; |
3d5b1ecd AZ |
494 | |
495 | if (!err) | |
496 | sg_copy_from_buffer(req->dst, | |
497 | sg_nents_for_len(req->dst, req->dst_len), | |
27710b8e | 498 | out_buf + pos, req->dst_len); |
3d5b1ecd AZ |
499 | done: |
500 | kzfree(req_ctx->out_buf); | |
501 | ||
502 | return err; | |
503 | } | |
504 | ||
505 | static void pkcs1pad_verify_complete_cb( | |
506 | struct crypto_async_request *child_async_req, int err) | |
507 | { | |
508 | struct akcipher_request *req = child_async_req->data; | |
509 | struct crypto_async_request async_req; | |
510 | ||
511 | if (err == -EINPROGRESS) | |
512 | return; | |
513 | ||
514 | async_req.data = req->base.data; | |
515 | async_req.tfm = crypto_akcipher_tfm(crypto_akcipher_reqtfm(req)); | |
516 | async_req.flags = child_async_req->flags; | |
517 | req->base.complete(&async_req, pkcs1pad_verify_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 | */ | |
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 | int err; | |
534 | ||
a49de377 | 535 | if (!ctx->key_size || req->src_len < ctx->key_size) |
3d5b1ecd AZ |
536 | return -EINVAL; |
537 | ||
3a32ce50 | 538 | req_ctx->out_buf = kmalloc(ctx->key_size, GFP_KERNEL); |
3d5b1ecd AZ |
539 | if (!req_ctx->out_buf) |
540 | return -ENOMEM; | |
541 | ||
542 | pkcs1pad_sg_set_buf(req_ctx->out_sg, req_ctx->out_buf, | |
6f0904ad | 543 | ctx->key_size, NULL); |
3d5b1ecd AZ |
544 | |
545 | akcipher_request_set_tfm(&req_ctx->child_req, ctx->child); | |
546 | akcipher_request_set_callback(&req_ctx->child_req, req->base.flags, | |
547 | pkcs1pad_verify_complete_cb, req); | |
548 | ||
d858b071 HX |
549 | /* Reuse input buffer, output to a new buffer */ |
550 | akcipher_request_set_crypt(&req_ctx->child_req, req->src, | |
551 | req_ctx->out_sg, req->src_len, | |
552 | ctx->key_size); | |
553 | ||
3ecc9725 | 554 | err = crypto_akcipher_encrypt(&req_ctx->child_req); |
4e5b0ad5 | 555 | if (err != -EINPROGRESS && err != -EBUSY) |
3d5b1ecd AZ |
556 | return pkcs1pad_verify_complete(req, err); |
557 | ||
558 | return err; | |
559 | } | |
560 | ||
561 | static int pkcs1pad_init_tfm(struct crypto_akcipher *tfm) | |
562 | { | |
563 | struct akcipher_instance *inst = akcipher_alg_instance(tfm); | |
a49de377 | 564 | struct pkcs1pad_inst_ctx *ictx = akcipher_instance_ctx(inst); |
3d5b1ecd AZ |
565 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); |
566 | struct crypto_akcipher *child_tfm; | |
567 | ||
c0d20d22 | 568 | child_tfm = crypto_spawn_akcipher(&ictx->spawn); |
3d5b1ecd AZ |
569 | if (IS_ERR(child_tfm)) |
570 | return PTR_ERR(child_tfm); | |
571 | ||
572 | ctx->child = child_tfm; | |
3d5b1ecd AZ |
573 | return 0; |
574 | } | |
575 | ||
576 | static void pkcs1pad_exit_tfm(struct crypto_akcipher *tfm) | |
577 | { | |
578 | struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm); | |
579 | ||
580 | crypto_free_akcipher(ctx->child); | |
581 | } | |
582 | ||
583 | static void pkcs1pad_free(struct akcipher_instance *inst) | |
584 | { | |
a49de377 TS |
585 | struct pkcs1pad_inst_ctx *ctx = akcipher_instance_ctx(inst); |
586 | struct crypto_akcipher_spawn *spawn = &ctx->spawn; | |
3d5b1ecd AZ |
587 | |
588 | crypto_drop_akcipher(spawn); | |
3d5b1ecd AZ |
589 | kfree(inst); |
590 | } | |
591 | ||
592 | static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb) | |
593 | { | |
c0d20d22 | 594 | const struct rsa_asn1_template *digest_info; |
3d5b1ecd AZ |
595 | struct crypto_attr_type *algt; |
596 | struct akcipher_instance *inst; | |
a49de377 | 597 | struct pkcs1pad_inst_ctx *ctx; |
3d5b1ecd AZ |
598 | struct crypto_akcipher_spawn *spawn; |
599 | struct akcipher_alg *rsa_alg; | |
600 | const char *rsa_alg_name; | |
a49de377 | 601 | const char *hash_name; |
3d5b1ecd AZ |
602 | int err; |
603 | ||
604 | algt = crypto_get_attr_type(tb); | |
605 | if (IS_ERR(algt)) | |
606 | return PTR_ERR(algt); | |
607 | ||
608 | if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask) | |
609 | return -EINVAL; | |
610 | ||
611 | rsa_alg_name = crypto_attr_alg_name(tb[1]); | |
612 | if (IS_ERR(rsa_alg_name)) | |
613 | return PTR_ERR(rsa_alg_name); | |
614 | ||
a49de377 TS |
615 | hash_name = crypto_attr_alg_name(tb[2]); |
616 | if (IS_ERR(hash_name)) | |
b3a8c8a5 | 617 | hash_name = NULL; |
c0d20d22 | 618 | |
b3a8c8a5 DK |
619 | if (hash_name) { |
620 | digest_info = rsa_lookup_asn1(hash_name); | |
621 | if (!digest_info) | |
622 | return -EINVAL; | |
623 | } else | |
624 | digest_info = NULL; | |
a49de377 TS |
625 | |
626 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
3d5b1ecd AZ |
627 | if (!inst) |
628 | return -ENOMEM; | |
629 | ||
a49de377 TS |
630 | ctx = akcipher_instance_ctx(inst); |
631 | spawn = &ctx->spawn; | |
c0d20d22 | 632 | ctx->digest_info = digest_info; |
a49de377 | 633 | |
3d5b1ecd AZ |
634 | crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst)); |
635 | err = crypto_grab_akcipher(spawn, rsa_alg_name, 0, | |
636 | crypto_requires_sync(algt->type, algt->mask)); | |
637 | if (err) | |
638 | goto out_free_inst; | |
639 | ||
640 | rsa_alg = crypto_spawn_akcipher_alg(spawn); | |
641 | ||
642 | err = -ENAMETOOLONG; | |
a49de377 | 643 | |
b3a8c8a5 DK |
644 | if (!hash_name) { |
645 | if (snprintf(inst->alg.base.cra_name, | |
646 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
647 | rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME) | |
648 | goto out_drop_alg; | |
649 | ||
650 | if (snprintf(inst->alg.base.cra_driver_name, | |
651 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)", | |
652 | rsa_alg->base.cra_driver_name) >= | |
653 | CRYPTO_MAX_ALG_NAME) | |
654 | goto out_drop_alg; | |
655 | } else { | |
656 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
657 | "pkcs1pad(%s,%s)", rsa_alg->base.cra_name, | |
658 | hash_name) >= CRYPTO_MAX_ALG_NAME) | |
659 | goto out_drop_alg; | |
660 | ||
661 | if (snprintf(inst->alg.base.cra_driver_name, | |
662 | CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)", | |
663 | rsa_alg->base.cra_driver_name, | |
664 | hash_name) >= CRYPTO_MAX_ALG_NAME) | |
665 | goto out_drop_alg; | |
666 | } | |
3d5b1ecd AZ |
667 | |
668 | inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC; | |
669 | inst->alg.base.cra_priority = rsa_alg->base.cra_priority; | |
670 | inst->alg.base.cra_ctxsize = sizeof(struct pkcs1pad_ctx); | |
671 | ||
672 | inst->alg.init = pkcs1pad_init_tfm; | |
673 | inst->alg.exit = pkcs1pad_exit_tfm; | |
674 | ||
675 | inst->alg.encrypt = pkcs1pad_encrypt; | |
676 | inst->alg.decrypt = pkcs1pad_decrypt; | |
677 | inst->alg.sign = pkcs1pad_sign; | |
678 | inst->alg.verify = pkcs1pad_verify; | |
679 | inst->alg.set_pub_key = pkcs1pad_set_pub_key; | |
680 | inst->alg.set_priv_key = pkcs1pad_set_priv_key; | |
681 | inst->alg.max_size = pkcs1pad_get_max_size; | |
682 | inst->alg.reqsize = sizeof(struct pkcs1pad_request) + rsa_alg->reqsize; | |
683 | ||
684 | inst->free = pkcs1pad_free; | |
685 | ||
686 | err = akcipher_register_instance(tmpl, inst); | |
687 | if (err) | |
c0d20d22 | 688 | goto out_drop_alg; |
3d5b1ecd AZ |
689 | |
690 | return 0; | |
691 | ||
692 | out_drop_alg: | |
693 | crypto_drop_akcipher(spawn); | |
694 | out_free_inst: | |
695 | kfree(inst); | |
696 | return err; | |
697 | } | |
698 | ||
699 | struct crypto_template rsa_pkcs1pad_tmpl = { | |
700 | .name = "pkcs1pad", | |
701 | .create = pkcs1pad_create, | |
702 | .module = THIS_MODULE, | |
703 | }; |