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31865c4c HX |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Linear symmetric key cipher operations. | |
4 | * | |
5 | * Generic encrypt/decrypt wrapper for ciphers. | |
6 | * | |
7 | * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | */ | |
9 | ||
10 | #include <linux/cryptouser.h> | |
11 | #include <linux/err.h> | |
12 | #include <linux/export.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/seq_file.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/string.h> | |
17 | #include <net/netlink.h> | |
18 | #include "skcipher.h" | |
19 | ||
20 | static inline struct crypto_lskcipher *__crypto_lskcipher_cast( | |
21 | struct crypto_tfm *tfm) | |
22 | { | |
23 | return container_of(tfm, struct crypto_lskcipher, base); | |
24 | } | |
25 | ||
26 | static inline struct lskcipher_alg *__crypto_lskcipher_alg( | |
27 | struct crypto_alg *alg) | |
28 | { | |
29 | return container_of(alg, struct lskcipher_alg, co.base); | |
30 | } | |
31 | ||
31865c4c HX |
32 | static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm, |
33 | const u8 *key, unsigned int keylen) | |
34 | { | |
35 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
36 | struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); | |
37 | u8 *buffer, *alignbuffer; | |
38 | unsigned long absize; | |
39 | int ret; | |
40 | ||
41 | absize = keylen + alignmask; | |
42 | buffer = kmalloc(absize, GFP_ATOMIC); | |
43 | if (!buffer) | |
44 | return -ENOMEM; | |
45 | ||
46 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
47 | memcpy(alignbuffer, key, keylen); | |
48 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
49 | kfree_sensitive(buffer); | |
50 | return ret; | |
51 | } | |
52 | ||
53 | int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key, | |
54 | unsigned int keylen) | |
55 | { | |
56 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
57 | struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); | |
58 | ||
59 | if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize) | |
60 | return -EINVAL; | |
61 | ||
62 | if ((unsigned long)key & alignmask) | |
63 | return lskcipher_setkey_unaligned(tfm, key, keylen); | |
64 | else | |
65 | return cipher->setkey(tfm, key, keylen); | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey); | |
68 | ||
69 | static int crypto_lskcipher_crypt_unaligned( | |
70 | struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len, | |
71 | u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src, | |
0ae4dcc1 | 72 | u8 *dst, unsigned len, u8 *iv, u32 flags)) |
31865c4c | 73 | { |
662ea18d | 74 | unsigned statesize = crypto_lskcipher_statesize(tfm); |
31865c4c HX |
75 | unsigned ivsize = crypto_lskcipher_ivsize(tfm); |
76 | unsigned bs = crypto_lskcipher_blocksize(tfm); | |
77 | unsigned cs = crypto_lskcipher_chunksize(tfm); | |
78 | int err; | |
79 | u8 *tiv; | |
80 | u8 *p; | |
81 | ||
82 | BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE || | |
83 | MAX_CIPHER_ALIGNMASK >= PAGE_SIZE); | |
84 | ||
85 | tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC); | |
86 | if (!tiv) | |
87 | return -ENOMEM; | |
88 | ||
662ea18d | 89 | memcpy(tiv, iv, ivsize + statesize); |
31865c4c HX |
90 | |
91 | p = kmalloc(PAGE_SIZE, GFP_ATOMIC); | |
92 | err = -ENOMEM; | |
93 | if (!p) | |
94 | goto out; | |
95 | ||
96 | while (len >= bs) { | |
97 | unsigned chunk = min((unsigned)PAGE_SIZE, len); | |
98 | int err; | |
99 | ||
100 | if (chunk > cs) | |
101 | chunk &= ~(cs - 1); | |
102 | ||
103 | memcpy(p, src, chunk); | |
0ae4dcc1 | 104 | err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
31865c4c HX |
105 | if (err) |
106 | goto out; | |
107 | ||
108 | memcpy(dst, p, chunk); | |
109 | src += chunk; | |
110 | dst += chunk; | |
111 | len -= chunk; | |
112 | } | |
113 | ||
114 | err = len ? -EINVAL : 0; | |
115 | ||
116 | out: | |
662ea18d | 117 | memcpy(iv, tiv, ivsize + statesize); |
31865c4c HX |
118 | kfree_sensitive(p); |
119 | kfree_sensitive(tiv); | |
120 | return err; | |
121 | } | |
122 | ||
123 | static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src, | |
124 | u8 *dst, unsigned len, u8 *iv, | |
125 | int (*crypt)(struct crypto_lskcipher *tfm, | |
126 | const u8 *src, u8 *dst, | |
127 | unsigned len, u8 *iv, | |
0ae4dcc1 | 128 | u32 flags)) |
31865c4c HX |
129 | { |
130 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
31865c4c HX |
131 | |
132 | if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) & | |
29ce50e0 EB |
133 | alignmask) |
134 | return crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv, | |
135 | crypt); | |
31865c4c | 136 | |
29ce50e0 | 137 | return crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
31865c4c HX |
138 | } |
139 | ||
140 | int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src, | |
141 | u8 *dst, unsigned len, u8 *iv) | |
142 | { | |
143 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); | |
144 | ||
31865c4c HX |
145 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt); |
146 | } | |
147 | EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt); | |
148 | ||
149 | int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src, | |
150 | u8 *dst, unsigned len, u8 *iv) | |
151 | { | |
152 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); | |
153 | ||
31865c4c HX |
154 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt); |
155 | } | |
156 | EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt); | |
157 | ||
31865c4c HX |
158 | static int crypto_lskcipher_crypt_sg(struct skcipher_request *req, |
159 | int (*crypt)(struct crypto_lskcipher *tfm, | |
160 | const u8 *src, u8 *dst, | |
662ea18d | 161 | unsigned len, u8 *ivs, |
0ae4dcc1 | 162 | u32 flags)) |
31865c4c HX |
163 | { |
164 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
165 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
662ea18d | 166 | u8 *ivs = skcipher_request_ctx(req); |
31865c4c HX |
167 | struct crypto_lskcipher *tfm = *ctx; |
168 | struct skcipher_walk walk; | |
662ea18d HX |
169 | unsigned ivsize; |
170 | u32 flags; | |
31865c4c HX |
171 | int err; |
172 | ||
662ea18d HX |
173 | ivsize = crypto_lskcipher_ivsize(tfm); |
174 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1); | |
7cfc2ab3 | 175 | memcpy(ivs, req->iv, ivsize); |
662ea18d HX |
176 | |
177 | flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP; | |
178 | ||
179 | if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT) | |
180 | flags |= CRYPTO_LSKCIPHER_FLAG_CONT; | |
662ea18d HX |
181 | |
182 | if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) | |
183 | flags |= CRYPTO_LSKCIPHER_FLAG_FINAL; | |
184 | ||
31865c4c HX |
185 | err = skcipher_walk_virt(&walk, req, false); |
186 | ||
187 | while (walk.nbytes) { | |
188 | err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr, | |
662ea18d HX |
189 | walk.nbytes, ivs, |
190 | flags & ~(walk.nbytes == walk.total ? | |
191 | 0 : CRYPTO_LSKCIPHER_FLAG_FINAL)); | |
31865c4c | 192 | err = skcipher_walk_done(&walk, err); |
662ea18d | 193 | flags |= CRYPTO_LSKCIPHER_FLAG_CONT; |
31865c4c HX |
194 | } |
195 | ||
7cfc2ab3 | 196 | memcpy(req->iv, ivs, ivsize); |
662ea18d | 197 | |
31865c4c HX |
198 | return err; |
199 | } | |
200 | ||
201 | int crypto_lskcipher_encrypt_sg(struct skcipher_request *req) | |
202 | { | |
203 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
204 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
205 | struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); | |
206 | ||
207 | return crypto_lskcipher_crypt_sg(req, alg->encrypt); | |
208 | } | |
209 | ||
210 | int crypto_lskcipher_decrypt_sg(struct skcipher_request *req) | |
211 | { | |
212 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
213 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
214 | struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); | |
215 | ||
216 | return crypto_lskcipher_crypt_sg(req, alg->decrypt); | |
217 | } | |
218 | ||
219 | static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm) | |
220 | { | |
221 | struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); | |
222 | struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); | |
223 | ||
224 | alg->exit(skcipher); | |
225 | } | |
226 | ||
227 | static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm) | |
228 | { | |
229 | struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); | |
230 | struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); | |
231 | ||
232 | if (alg->exit) | |
233 | skcipher->base.exit = crypto_lskcipher_exit_tfm; | |
234 | ||
235 | if (alg->init) | |
236 | return alg->init(skcipher); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static void crypto_lskcipher_free_instance(struct crypto_instance *inst) | |
242 | { | |
243 | struct lskcipher_instance *skcipher = | |
244 | container_of(inst, struct lskcipher_instance, s.base); | |
245 | ||
246 | skcipher->free(skcipher); | |
247 | } | |
248 | ||
249 | static void __maybe_unused crypto_lskcipher_show( | |
250 | struct seq_file *m, struct crypto_alg *alg) | |
251 | { | |
252 | struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); | |
253 | ||
254 | seq_printf(m, "type : lskcipher\n"); | |
255 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
256 | seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize); | |
257 | seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize); | |
258 | seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize); | |
259 | seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize); | |
662ea18d | 260 | seq_printf(m, "statesize : %u\n", skcipher->co.statesize); |
31865c4c HX |
261 | } |
262 | ||
263 | static int __maybe_unused crypto_lskcipher_report( | |
264 | struct sk_buff *skb, struct crypto_alg *alg) | |
265 | { | |
266 | struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); | |
267 | struct crypto_report_blkcipher rblkcipher; | |
268 | ||
269 | memset(&rblkcipher, 0, sizeof(rblkcipher)); | |
270 | ||
271 | strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type)); | |
272 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
273 | ||
274 | rblkcipher.blocksize = alg->cra_blocksize; | |
275 | rblkcipher.min_keysize = skcipher->co.min_keysize; | |
276 | rblkcipher.max_keysize = skcipher->co.max_keysize; | |
277 | rblkcipher.ivsize = skcipher->co.ivsize; | |
278 | ||
279 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
280 | sizeof(rblkcipher), &rblkcipher); | |
281 | } | |
282 | ||
31865c4c HX |
283 | static const struct crypto_type crypto_lskcipher_type = { |
284 | .extsize = crypto_alg_extsize, | |
285 | .init_tfm = crypto_lskcipher_init_tfm, | |
286 | .free = crypto_lskcipher_free_instance, | |
287 | #ifdef CONFIG_PROC_FS | |
288 | .show = crypto_lskcipher_show, | |
289 | #endif | |
290 | #if IS_ENABLED(CONFIG_CRYPTO_USER) | |
291 | .report = crypto_lskcipher_report, | |
31865c4c HX |
292 | #endif |
293 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
294 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
295 | .type = CRYPTO_ALG_TYPE_LSKCIPHER, | |
296 | .tfmsize = offsetof(struct crypto_lskcipher, base), | |
297 | }; | |
298 | ||
299 | static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm) | |
300 | { | |
301 | struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); | |
302 | ||
303 | crypto_free_lskcipher(*ctx); | |
304 | } | |
305 | ||
306 | int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm) | |
307 | { | |
308 | struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); | |
309 | struct crypto_alg *calg = tfm->__crt_alg; | |
310 | struct crypto_lskcipher *skcipher; | |
311 | ||
312 | if (!crypto_mod_get(calg)) | |
313 | return -EAGAIN; | |
314 | ||
315 | skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type); | |
316 | if (IS_ERR(skcipher)) { | |
317 | crypto_mod_put(calg); | |
318 | return PTR_ERR(skcipher); | |
319 | } | |
320 | ||
321 | *ctx = skcipher; | |
322 | tfm->exit = crypto_lskcipher_exit_tfm_sg; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn, | |
328 | struct crypto_instance *inst, | |
329 | const char *name, u32 type, u32 mask) | |
330 | { | |
331 | spawn->base.frontend = &crypto_lskcipher_type; | |
332 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(crypto_grab_lskcipher); | |
335 | ||
336 | struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name, | |
337 | u32 type, u32 mask) | |
338 | { | |
339 | return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask); | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher); | |
342 | ||
343 | static int lskcipher_prepare_alg(struct lskcipher_alg *alg) | |
344 | { | |
345 | struct crypto_alg *base = &alg->co.base; | |
346 | int err; | |
347 | ||
348 | err = skcipher_prepare_alg_common(&alg->co); | |
349 | if (err) | |
350 | return err; | |
351 | ||
352 | if (alg->co.chunksize & (alg->co.chunksize - 1)) | |
353 | return -EINVAL; | |
354 | ||
355 | base->cra_type = &crypto_lskcipher_type; | |
356 | base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | int crypto_register_lskcipher(struct lskcipher_alg *alg) | |
362 | { | |
363 | struct crypto_alg *base = &alg->co.base; | |
364 | int err; | |
365 | ||
366 | err = lskcipher_prepare_alg(alg); | |
367 | if (err) | |
368 | return err; | |
369 | ||
370 | return crypto_register_alg(base); | |
371 | } | |
372 | EXPORT_SYMBOL_GPL(crypto_register_lskcipher); | |
373 | ||
374 | void crypto_unregister_lskcipher(struct lskcipher_alg *alg) | |
375 | { | |
376 | crypto_unregister_alg(&alg->co.base); | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher); | |
379 | ||
380 | int crypto_register_lskciphers(struct lskcipher_alg *algs, int count) | |
381 | { | |
382 | int i, ret; | |
383 | ||
384 | for (i = 0; i < count; i++) { | |
385 | ret = crypto_register_lskcipher(&algs[i]); | |
386 | if (ret) | |
387 | goto err; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | ||
392 | err: | |
393 | for (--i; i >= 0; --i) | |
394 | crypto_unregister_lskcipher(&algs[i]); | |
395 | ||
396 | return ret; | |
397 | } | |
398 | EXPORT_SYMBOL_GPL(crypto_register_lskciphers); | |
399 | ||
400 | void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count) | |
401 | { | |
402 | int i; | |
403 | ||
404 | for (i = count - 1; i >= 0; --i) | |
405 | crypto_unregister_lskcipher(&algs[i]); | |
406 | } | |
407 | EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers); | |
408 | ||
409 | int lskcipher_register_instance(struct crypto_template *tmpl, | |
410 | struct lskcipher_instance *inst) | |
411 | { | |
412 | int err; | |
413 | ||
414 | if (WARN_ON(!inst->free)) | |
415 | return -EINVAL; | |
416 | ||
417 | err = lskcipher_prepare_alg(&inst->alg); | |
418 | if (err) | |
419 | return err; | |
420 | ||
421 | return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst)); | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(lskcipher_register_instance); | |
424 | ||
425 | static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key, | |
426 | unsigned int keylen) | |
427 | { | |
428 | struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm); | |
429 | ||
430 | crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
431 | crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) & | |
432 | CRYPTO_TFM_REQ_MASK); | |
433 | return crypto_lskcipher_setkey(cipher, key, keylen); | |
434 | } | |
435 | ||
436 | static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm) | |
437 | { | |
438 | struct lskcipher_instance *inst = lskcipher_alg_instance(tfm); | |
439 | struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); | |
440 | struct crypto_lskcipher_spawn *spawn; | |
441 | struct crypto_lskcipher *cipher; | |
442 | ||
443 | spawn = lskcipher_instance_ctx(inst); | |
444 | cipher = crypto_spawn_lskcipher(spawn); | |
445 | if (IS_ERR(cipher)) | |
446 | return PTR_ERR(cipher); | |
447 | ||
448 | *ctx = cipher; | |
449 | return 0; | |
450 | } | |
451 | ||
452 | static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm) | |
453 | { | |
454 | struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); | |
455 | ||
456 | crypto_free_lskcipher(*ctx); | |
457 | } | |
458 | ||
459 | static void lskcipher_free_instance_simple(struct lskcipher_instance *inst) | |
460 | { | |
461 | crypto_drop_lskcipher(lskcipher_instance_ctx(inst)); | |
462 | kfree(inst); | |
463 | } | |
464 | ||
465 | /** | |
466 | * lskcipher_alloc_instance_simple - allocate instance of simple block cipher | |
467 | * | |
468 | * Allocate an lskcipher_instance for a simple block cipher mode of operation, | |
469 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
470 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
471 | * alignmask, and priority are set from the underlying cipher but can be | |
472 | * overridden if needed. The tfm context defaults to | |
473 | * struct crypto_lskcipher *, and default ->setkey(), ->init(), and | |
474 | * ->exit() methods are installed. | |
475 | * | |
476 | * @tmpl: the template being instantiated | |
477 | * @tb: the template parameters | |
478 | * | |
479 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
480 | * needs to register the instance. | |
481 | */ | |
482 | struct lskcipher_instance *lskcipher_alloc_instance_simple( | |
483 | struct crypto_template *tmpl, struct rtattr **tb) | |
484 | { | |
485 | u32 mask; | |
486 | struct lskcipher_instance *inst; | |
487 | struct crypto_lskcipher_spawn *spawn; | |
8aee5d4e | 488 | char ecb_name[CRYPTO_MAX_ALG_NAME]; |
31865c4c | 489 | struct lskcipher_alg *cipher_alg; |
8aee5d4e | 490 | const char *cipher_name; |
31865c4c HX |
491 | int err; |
492 | ||
493 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask); | |
494 | if (err) | |
495 | return ERR_PTR(err); | |
496 | ||
8aee5d4e HX |
497 | cipher_name = crypto_attr_alg_name(tb[1]); |
498 | if (IS_ERR(cipher_name)) | |
499 | return ERR_CAST(cipher_name); | |
500 | ||
31865c4c HX |
501 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
502 | if (!inst) | |
503 | return ERR_PTR(-ENOMEM); | |
504 | ||
505 | spawn = lskcipher_instance_ctx(inst); | |
506 | err = crypto_grab_lskcipher(spawn, | |
507 | lskcipher_crypto_instance(inst), | |
8aee5d4e HX |
508 | cipher_name, 0, mask); |
509 | ||
510 | ecb_name[0] = 0; | |
511 | if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) { | |
512 | err = -ENAMETOOLONG; | |
513 | if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", | |
514 | cipher_name) >= CRYPTO_MAX_ALG_NAME) | |
515 | goto err_free_inst; | |
516 | ||
517 | err = crypto_grab_lskcipher(spawn, | |
518 | lskcipher_crypto_instance(inst), | |
519 | ecb_name, 0, mask); | |
520 | } | |
521 | ||
31865c4c HX |
522 | if (err) |
523 | goto err_free_inst; | |
8aee5d4e | 524 | |
31865c4c HX |
525 | cipher_alg = crypto_lskcipher_spawn_alg(spawn); |
526 | ||
527 | err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name, | |
528 | &cipher_alg->co.base); | |
529 | if (err) | |
530 | goto err_free_inst; | |
531 | ||
8aee5d4e HX |
532 | if (ecb_name[0]) { |
533 | int len; | |
534 | ||
87d6621c | 535 | err = -EINVAL; |
8aee5d4e HX |
536 | len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4], |
537 | sizeof(ecb_name)); | |
538 | if (len < 2) | |
539 | goto err_free_inst; | |
540 | ||
541 | if (ecb_name[len - 1] != ')') | |
542 | goto err_free_inst; | |
543 | ||
544 | ecb_name[len - 1] = 0; | |
545 | ||
546 | err = -ENAMETOOLONG; | |
547 | if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
548 | "%s(%s)", tmpl->name, ecb_name) >= | |
549 | CRYPTO_MAX_ALG_NAME) | |
550 | goto err_free_inst; | |
551 | ||
552 | if (strcmp(ecb_name, cipher_name) && | |
553 | snprintf(inst->alg.co.base.cra_driver_name, | |
554 | CRYPTO_MAX_ALG_NAME, | |
555 | "%s(%s)", tmpl->name, cipher_name) >= | |
556 | CRYPTO_MAX_ALG_NAME) | |
557 | goto err_free_inst; | |
558 | } else { | |
559 | /* Don't allow nesting. */ | |
560 | err = -ELOOP; | |
561 | if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE)) | |
562 | goto err_free_inst; | |
563 | } | |
31865c4c HX |
564 | |
565 | err = -EINVAL; | |
566 | if (cipher_alg->co.ivsize) | |
567 | goto err_free_inst; | |
568 | ||
569 | inst->free = lskcipher_free_instance_simple; | |
570 | ||
571 | /* Default algorithm properties, can be overridden */ | |
572 | inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize; | |
573 | inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask; | |
574 | inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority; | |
575 | inst->alg.co.min_keysize = cipher_alg->co.min_keysize; | |
576 | inst->alg.co.max_keysize = cipher_alg->co.max_keysize; | |
577 | inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize; | |
37c6fc32 | 578 | inst->alg.co.statesize = cipher_alg->co.statesize; |
31865c4c HX |
579 | |
580 | /* Use struct crypto_lskcipher * by default, can be overridden */ | |
581 | inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *); | |
582 | inst->alg.setkey = lskcipher_setkey_simple; | |
583 | inst->alg.init = lskcipher_init_tfm_simple; | |
584 | inst->alg.exit = lskcipher_exit_tfm_simple; | |
585 | ||
586 | return inst; | |
587 | ||
588 | err_free_inst: | |
589 | lskcipher_free_instance_simple(inst); | |
590 | return ERR_PTR(err); | |
591 | } | |
592 | EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple); |