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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 | ||
32 | static inline struct crypto_istat_cipher *lskcipher_get_stat( | |
33 | struct lskcipher_alg *alg) | |
34 | { | |
35 | return skcipher_get_stat_common(&alg->co); | |
36 | } | |
37 | ||
38 | static inline int crypto_lskcipher_errstat(struct lskcipher_alg *alg, int err) | |
39 | { | |
40 | struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); | |
41 | ||
42 | if (!IS_ENABLED(CONFIG_CRYPTO_STATS)) | |
43 | return err; | |
44 | ||
45 | if (err) | |
46 | atomic64_inc(&istat->err_cnt); | |
47 | ||
48 | return err; | |
49 | } | |
50 | ||
51 | static int lskcipher_setkey_unaligned(struct crypto_lskcipher *tfm, | |
52 | const u8 *key, unsigned int keylen) | |
53 | { | |
54 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
55 | struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); | |
56 | u8 *buffer, *alignbuffer; | |
57 | unsigned long absize; | |
58 | int ret; | |
59 | ||
60 | absize = keylen + alignmask; | |
61 | buffer = kmalloc(absize, GFP_ATOMIC); | |
62 | if (!buffer) | |
63 | return -ENOMEM; | |
64 | ||
65 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
66 | memcpy(alignbuffer, key, keylen); | |
67 | ret = cipher->setkey(tfm, alignbuffer, keylen); | |
68 | kfree_sensitive(buffer); | |
69 | return ret; | |
70 | } | |
71 | ||
72 | int crypto_lskcipher_setkey(struct crypto_lskcipher *tfm, const u8 *key, | |
73 | unsigned int keylen) | |
74 | { | |
75 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
76 | struct lskcipher_alg *cipher = crypto_lskcipher_alg(tfm); | |
77 | ||
78 | if (keylen < cipher->co.min_keysize || keylen > cipher->co.max_keysize) | |
79 | return -EINVAL; | |
80 | ||
81 | if ((unsigned long)key & alignmask) | |
82 | return lskcipher_setkey_unaligned(tfm, key, keylen); | |
83 | else | |
84 | return cipher->setkey(tfm, key, keylen); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(crypto_lskcipher_setkey); | |
87 | ||
88 | static int crypto_lskcipher_crypt_unaligned( | |
89 | struct crypto_lskcipher *tfm, const u8 *src, u8 *dst, unsigned len, | |
90 | u8 *iv, int (*crypt)(struct crypto_lskcipher *tfm, const u8 *src, | |
0ae4dcc1 | 91 | u8 *dst, unsigned len, u8 *iv, u32 flags)) |
31865c4c | 92 | { |
662ea18d | 93 | unsigned statesize = crypto_lskcipher_statesize(tfm); |
31865c4c HX |
94 | unsigned ivsize = crypto_lskcipher_ivsize(tfm); |
95 | unsigned bs = crypto_lskcipher_blocksize(tfm); | |
96 | unsigned cs = crypto_lskcipher_chunksize(tfm); | |
97 | int err; | |
98 | u8 *tiv; | |
99 | u8 *p; | |
100 | ||
101 | BUILD_BUG_ON(MAX_CIPHER_BLOCKSIZE > PAGE_SIZE || | |
102 | MAX_CIPHER_ALIGNMASK >= PAGE_SIZE); | |
103 | ||
104 | tiv = kmalloc(PAGE_SIZE, GFP_ATOMIC); | |
105 | if (!tiv) | |
106 | return -ENOMEM; | |
107 | ||
662ea18d | 108 | memcpy(tiv, iv, ivsize + statesize); |
31865c4c HX |
109 | |
110 | p = kmalloc(PAGE_SIZE, GFP_ATOMIC); | |
111 | err = -ENOMEM; | |
112 | if (!p) | |
113 | goto out; | |
114 | ||
115 | while (len >= bs) { | |
116 | unsigned chunk = min((unsigned)PAGE_SIZE, len); | |
117 | int err; | |
118 | ||
119 | if (chunk > cs) | |
120 | chunk &= ~(cs - 1); | |
121 | ||
122 | memcpy(p, src, chunk); | |
0ae4dcc1 | 123 | err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
31865c4c HX |
124 | if (err) |
125 | goto out; | |
126 | ||
127 | memcpy(dst, p, chunk); | |
128 | src += chunk; | |
129 | dst += chunk; | |
130 | len -= chunk; | |
131 | } | |
132 | ||
133 | err = len ? -EINVAL : 0; | |
134 | ||
135 | out: | |
662ea18d | 136 | memcpy(iv, tiv, ivsize + statesize); |
31865c4c HX |
137 | kfree_sensitive(p); |
138 | kfree_sensitive(tiv); | |
139 | return err; | |
140 | } | |
141 | ||
142 | static int crypto_lskcipher_crypt(struct crypto_lskcipher *tfm, const u8 *src, | |
143 | u8 *dst, unsigned len, u8 *iv, | |
144 | int (*crypt)(struct crypto_lskcipher *tfm, | |
145 | const u8 *src, u8 *dst, | |
146 | unsigned len, u8 *iv, | |
0ae4dcc1 | 147 | u32 flags)) |
31865c4c HX |
148 | { |
149 | unsigned long alignmask = crypto_lskcipher_alignmask(tfm); | |
150 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); | |
151 | int ret; | |
152 | ||
153 | if (((unsigned long)src | (unsigned long)dst | (unsigned long)iv) & | |
154 | alignmask) { | |
155 | ret = crypto_lskcipher_crypt_unaligned(tfm, src, dst, len, iv, | |
156 | crypt); | |
157 | goto out; | |
158 | } | |
159 | ||
0ae4dcc1 | 160 | ret = crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
31865c4c HX |
161 | |
162 | out: | |
163 | return crypto_lskcipher_errstat(alg, ret); | |
164 | } | |
165 | ||
166 | int crypto_lskcipher_encrypt(struct crypto_lskcipher *tfm, const u8 *src, | |
167 | u8 *dst, unsigned len, u8 *iv) | |
168 | { | |
169 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); | |
170 | ||
171 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { | |
172 | struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); | |
173 | ||
174 | atomic64_inc(&istat->encrypt_cnt); | |
175 | atomic64_add(len, &istat->encrypt_tlen); | |
176 | } | |
177 | ||
178 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->encrypt); | |
179 | } | |
180 | EXPORT_SYMBOL_GPL(crypto_lskcipher_encrypt); | |
181 | ||
182 | int crypto_lskcipher_decrypt(struct crypto_lskcipher *tfm, const u8 *src, | |
183 | u8 *dst, unsigned len, u8 *iv) | |
184 | { | |
185 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm); | |
186 | ||
187 | if (IS_ENABLED(CONFIG_CRYPTO_STATS)) { | |
188 | struct crypto_istat_cipher *istat = lskcipher_get_stat(alg); | |
189 | ||
190 | atomic64_inc(&istat->decrypt_cnt); | |
191 | atomic64_add(len, &istat->decrypt_tlen); | |
192 | } | |
193 | ||
194 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, alg->decrypt); | |
195 | } | |
196 | EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt); | |
197 | ||
31865c4c HX |
198 | static int crypto_lskcipher_crypt_sg(struct skcipher_request *req, |
199 | int (*crypt)(struct crypto_lskcipher *tfm, | |
200 | const u8 *src, u8 *dst, | |
662ea18d | 201 | unsigned len, u8 *ivs, |
0ae4dcc1 | 202 | u32 flags)) |
31865c4c HX |
203 | { |
204 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
205 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
662ea18d | 206 | u8 *ivs = skcipher_request_ctx(req); |
31865c4c HX |
207 | struct crypto_lskcipher *tfm = *ctx; |
208 | struct skcipher_walk walk; | |
662ea18d HX |
209 | unsigned ivsize; |
210 | u32 flags; | |
31865c4c HX |
211 | int err; |
212 | ||
662ea18d HX |
213 | ivsize = crypto_lskcipher_ivsize(tfm); |
214 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1); | |
7cfc2ab3 | 215 | memcpy(ivs, req->iv, ivsize); |
662ea18d HX |
216 | |
217 | flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP; | |
218 | ||
219 | if (req->base.flags & CRYPTO_SKCIPHER_REQ_CONT) | |
220 | flags |= CRYPTO_LSKCIPHER_FLAG_CONT; | |
662ea18d HX |
221 | |
222 | if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) | |
223 | flags |= CRYPTO_LSKCIPHER_FLAG_FINAL; | |
224 | ||
31865c4c HX |
225 | err = skcipher_walk_virt(&walk, req, false); |
226 | ||
227 | while (walk.nbytes) { | |
228 | err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr, | |
662ea18d HX |
229 | walk.nbytes, ivs, |
230 | flags & ~(walk.nbytes == walk.total ? | |
231 | 0 : CRYPTO_LSKCIPHER_FLAG_FINAL)); | |
31865c4c | 232 | err = skcipher_walk_done(&walk, err); |
662ea18d | 233 | flags |= CRYPTO_LSKCIPHER_FLAG_CONT; |
31865c4c HX |
234 | } |
235 | ||
7cfc2ab3 | 236 | memcpy(req->iv, ivs, ivsize); |
662ea18d | 237 | |
31865c4c HX |
238 | return err; |
239 | } | |
240 | ||
241 | int crypto_lskcipher_encrypt_sg(struct skcipher_request *req) | |
242 | { | |
243 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
244 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
245 | struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); | |
246 | ||
247 | return crypto_lskcipher_crypt_sg(req, alg->encrypt); | |
248 | } | |
249 | ||
250 | int crypto_lskcipher_decrypt_sg(struct skcipher_request *req) | |
251 | { | |
252 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); | |
253 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(skcipher); | |
254 | struct lskcipher_alg *alg = crypto_lskcipher_alg(*ctx); | |
255 | ||
256 | return crypto_lskcipher_crypt_sg(req, alg->decrypt); | |
257 | } | |
258 | ||
259 | static void crypto_lskcipher_exit_tfm(struct crypto_tfm *tfm) | |
260 | { | |
261 | struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); | |
262 | struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); | |
263 | ||
264 | alg->exit(skcipher); | |
265 | } | |
266 | ||
267 | static int crypto_lskcipher_init_tfm(struct crypto_tfm *tfm) | |
268 | { | |
269 | struct crypto_lskcipher *skcipher = __crypto_lskcipher_cast(tfm); | |
270 | struct lskcipher_alg *alg = crypto_lskcipher_alg(skcipher); | |
271 | ||
272 | if (alg->exit) | |
273 | skcipher->base.exit = crypto_lskcipher_exit_tfm; | |
274 | ||
275 | if (alg->init) | |
276 | return alg->init(skcipher); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | static void crypto_lskcipher_free_instance(struct crypto_instance *inst) | |
282 | { | |
283 | struct lskcipher_instance *skcipher = | |
284 | container_of(inst, struct lskcipher_instance, s.base); | |
285 | ||
286 | skcipher->free(skcipher); | |
287 | } | |
288 | ||
289 | static void __maybe_unused crypto_lskcipher_show( | |
290 | struct seq_file *m, struct crypto_alg *alg) | |
291 | { | |
292 | struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); | |
293 | ||
294 | seq_printf(m, "type : lskcipher\n"); | |
295 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
296 | seq_printf(m, "min keysize : %u\n", skcipher->co.min_keysize); | |
297 | seq_printf(m, "max keysize : %u\n", skcipher->co.max_keysize); | |
298 | seq_printf(m, "ivsize : %u\n", skcipher->co.ivsize); | |
299 | seq_printf(m, "chunksize : %u\n", skcipher->co.chunksize); | |
662ea18d | 300 | seq_printf(m, "statesize : %u\n", skcipher->co.statesize); |
31865c4c HX |
301 | } |
302 | ||
303 | static int __maybe_unused crypto_lskcipher_report( | |
304 | struct sk_buff *skb, struct crypto_alg *alg) | |
305 | { | |
306 | struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); | |
307 | struct crypto_report_blkcipher rblkcipher; | |
308 | ||
309 | memset(&rblkcipher, 0, sizeof(rblkcipher)); | |
310 | ||
311 | strscpy(rblkcipher.type, "lskcipher", sizeof(rblkcipher.type)); | |
312 | strscpy(rblkcipher.geniv, "<none>", sizeof(rblkcipher.geniv)); | |
313 | ||
314 | rblkcipher.blocksize = alg->cra_blocksize; | |
315 | rblkcipher.min_keysize = skcipher->co.min_keysize; | |
316 | rblkcipher.max_keysize = skcipher->co.max_keysize; | |
317 | rblkcipher.ivsize = skcipher->co.ivsize; | |
318 | ||
319 | return nla_put(skb, CRYPTOCFGA_REPORT_BLKCIPHER, | |
320 | sizeof(rblkcipher), &rblkcipher); | |
321 | } | |
322 | ||
323 | static int __maybe_unused crypto_lskcipher_report_stat( | |
324 | struct sk_buff *skb, struct crypto_alg *alg) | |
325 | { | |
326 | struct lskcipher_alg *skcipher = __crypto_lskcipher_alg(alg); | |
327 | struct crypto_istat_cipher *istat; | |
328 | struct crypto_stat_cipher rcipher; | |
329 | ||
330 | istat = lskcipher_get_stat(skcipher); | |
331 | ||
332 | memset(&rcipher, 0, sizeof(rcipher)); | |
333 | ||
334 | strscpy(rcipher.type, "cipher", sizeof(rcipher.type)); | |
335 | ||
336 | rcipher.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt); | |
337 | rcipher.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen); | |
338 | rcipher.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt); | |
339 | rcipher.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen); | |
340 | rcipher.stat_err_cnt = atomic64_read(&istat->err_cnt); | |
341 | ||
342 | return nla_put(skb, CRYPTOCFGA_STAT_CIPHER, sizeof(rcipher), &rcipher); | |
343 | } | |
344 | ||
345 | static const struct crypto_type crypto_lskcipher_type = { | |
346 | .extsize = crypto_alg_extsize, | |
347 | .init_tfm = crypto_lskcipher_init_tfm, | |
348 | .free = crypto_lskcipher_free_instance, | |
349 | #ifdef CONFIG_PROC_FS | |
350 | .show = crypto_lskcipher_show, | |
351 | #endif | |
352 | #if IS_ENABLED(CONFIG_CRYPTO_USER) | |
353 | .report = crypto_lskcipher_report, | |
354 | #endif | |
355 | #ifdef CONFIG_CRYPTO_STATS | |
356 | .report_stat = crypto_lskcipher_report_stat, | |
357 | #endif | |
358 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
359 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
360 | .type = CRYPTO_ALG_TYPE_LSKCIPHER, | |
361 | .tfmsize = offsetof(struct crypto_lskcipher, base), | |
362 | }; | |
363 | ||
364 | static void crypto_lskcipher_exit_tfm_sg(struct crypto_tfm *tfm) | |
365 | { | |
366 | struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); | |
367 | ||
368 | crypto_free_lskcipher(*ctx); | |
369 | } | |
370 | ||
371 | int crypto_init_lskcipher_ops_sg(struct crypto_tfm *tfm) | |
372 | { | |
373 | struct crypto_lskcipher **ctx = crypto_tfm_ctx(tfm); | |
374 | struct crypto_alg *calg = tfm->__crt_alg; | |
375 | struct crypto_lskcipher *skcipher; | |
376 | ||
377 | if (!crypto_mod_get(calg)) | |
378 | return -EAGAIN; | |
379 | ||
380 | skcipher = crypto_create_tfm(calg, &crypto_lskcipher_type); | |
381 | if (IS_ERR(skcipher)) { | |
382 | crypto_mod_put(calg); | |
383 | return PTR_ERR(skcipher); | |
384 | } | |
385 | ||
386 | *ctx = skcipher; | |
387 | tfm->exit = crypto_lskcipher_exit_tfm_sg; | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
392 | int crypto_grab_lskcipher(struct crypto_lskcipher_spawn *spawn, | |
393 | struct crypto_instance *inst, | |
394 | const char *name, u32 type, u32 mask) | |
395 | { | |
396 | spawn->base.frontend = &crypto_lskcipher_type; | |
397 | return crypto_grab_spawn(&spawn->base, inst, name, type, mask); | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(crypto_grab_lskcipher); | |
400 | ||
401 | struct crypto_lskcipher *crypto_alloc_lskcipher(const char *alg_name, | |
402 | u32 type, u32 mask) | |
403 | { | |
404 | return crypto_alloc_tfm(alg_name, &crypto_lskcipher_type, type, mask); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(crypto_alloc_lskcipher); | |
407 | ||
408 | static int lskcipher_prepare_alg(struct lskcipher_alg *alg) | |
409 | { | |
410 | struct crypto_alg *base = &alg->co.base; | |
411 | int err; | |
412 | ||
413 | err = skcipher_prepare_alg_common(&alg->co); | |
414 | if (err) | |
415 | return err; | |
416 | ||
417 | if (alg->co.chunksize & (alg->co.chunksize - 1)) | |
418 | return -EINVAL; | |
419 | ||
420 | base->cra_type = &crypto_lskcipher_type; | |
421 | base->cra_flags |= CRYPTO_ALG_TYPE_LSKCIPHER; | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | int crypto_register_lskcipher(struct lskcipher_alg *alg) | |
427 | { | |
428 | struct crypto_alg *base = &alg->co.base; | |
429 | int err; | |
430 | ||
431 | err = lskcipher_prepare_alg(alg); | |
432 | if (err) | |
433 | return err; | |
434 | ||
435 | return crypto_register_alg(base); | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(crypto_register_lskcipher); | |
438 | ||
439 | void crypto_unregister_lskcipher(struct lskcipher_alg *alg) | |
440 | { | |
441 | crypto_unregister_alg(&alg->co.base); | |
442 | } | |
443 | EXPORT_SYMBOL_GPL(crypto_unregister_lskcipher); | |
444 | ||
445 | int crypto_register_lskciphers(struct lskcipher_alg *algs, int count) | |
446 | { | |
447 | int i, ret; | |
448 | ||
449 | for (i = 0; i < count; i++) { | |
450 | ret = crypto_register_lskcipher(&algs[i]); | |
451 | if (ret) | |
452 | goto err; | |
453 | } | |
454 | ||
455 | return 0; | |
456 | ||
457 | err: | |
458 | for (--i; i >= 0; --i) | |
459 | crypto_unregister_lskcipher(&algs[i]); | |
460 | ||
461 | return ret; | |
462 | } | |
463 | EXPORT_SYMBOL_GPL(crypto_register_lskciphers); | |
464 | ||
465 | void crypto_unregister_lskciphers(struct lskcipher_alg *algs, int count) | |
466 | { | |
467 | int i; | |
468 | ||
469 | for (i = count - 1; i >= 0; --i) | |
470 | crypto_unregister_lskcipher(&algs[i]); | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(crypto_unregister_lskciphers); | |
473 | ||
474 | int lskcipher_register_instance(struct crypto_template *tmpl, | |
475 | struct lskcipher_instance *inst) | |
476 | { | |
477 | int err; | |
478 | ||
479 | if (WARN_ON(!inst->free)) | |
480 | return -EINVAL; | |
481 | ||
482 | err = lskcipher_prepare_alg(&inst->alg); | |
483 | if (err) | |
484 | return err; | |
485 | ||
486 | return crypto_register_instance(tmpl, lskcipher_crypto_instance(inst)); | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(lskcipher_register_instance); | |
489 | ||
490 | static int lskcipher_setkey_simple(struct crypto_lskcipher *tfm, const u8 *key, | |
491 | unsigned int keylen) | |
492 | { | |
493 | struct crypto_lskcipher *cipher = lskcipher_cipher_simple(tfm); | |
494 | ||
495 | crypto_lskcipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK); | |
496 | crypto_lskcipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) & | |
497 | CRYPTO_TFM_REQ_MASK); | |
498 | return crypto_lskcipher_setkey(cipher, key, keylen); | |
499 | } | |
500 | ||
501 | static int lskcipher_init_tfm_simple(struct crypto_lskcipher *tfm) | |
502 | { | |
503 | struct lskcipher_instance *inst = lskcipher_alg_instance(tfm); | |
504 | struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); | |
505 | struct crypto_lskcipher_spawn *spawn; | |
506 | struct crypto_lskcipher *cipher; | |
507 | ||
508 | spawn = lskcipher_instance_ctx(inst); | |
509 | cipher = crypto_spawn_lskcipher(spawn); | |
510 | if (IS_ERR(cipher)) | |
511 | return PTR_ERR(cipher); | |
512 | ||
513 | *ctx = cipher; | |
514 | return 0; | |
515 | } | |
516 | ||
517 | static void lskcipher_exit_tfm_simple(struct crypto_lskcipher *tfm) | |
518 | { | |
519 | struct crypto_lskcipher **ctx = crypto_lskcipher_ctx(tfm); | |
520 | ||
521 | crypto_free_lskcipher(*ctx); | |
522 | } | |
523 | ||
524 | static void lskcipher_free_instance_simple(struct lskcipher_instance *inst) | |
525 | { | |
526 | crypto_drop_lskcipher(lskcipher_instance_ctx(inst)); | |
527 | kfree(inst); | |
528 | } | |
529 | ||
530 | /** | |
531 | * lskcipher_alloc_instance_simple - allocate instance of simple block cipher | |
532 | * | |
533 | * Allocate an lskcipher_instance for a simple block cipher mode of operation, | |
534 | * e.g. cbc or ecb. The instance context will have just a single crypto_spawn, | |
535 | * that for the underlying cipher. The {min,max}_keysize, ivsize, blocksize, | |
536 | * alignmask, and priority are set from the underlying cipher but can be | |
537 | * overridden if needed. The tfm context defaults to | |
538 | * struct crypto_lskcipher *, and default ->setkey(), ->init(), and | |
539 | * ->exit() methods are installed. | |
540 | * | |
541 | * @tmpl: the template being instantiated | |
542 | * @tb: the template parameters | |
543 | * | |
544 | * Return: a pointer to the new instance, or an ERR_PTR(). The caller still | |
545 | * needs to register the instance. | |
546 | */ | |
547 | struct lskcipher_instance *lskcipher_alloc_instance_simple( | |
548 | struct crypto_template *tmpl, struct rtattr **tb) | |
549 | { | |
550 | u32 mask; | |
551 | struct lskcipher_instance *inst; | |
552 | struct crypto_lskcipher_spawn *spawn; | |
8aee5d4e | 553 | char ecb_name[CRYPTO_MAX_ALG_NAME]; |
31865c4c | 554 | struct lskcipher_alg *cipher_alg; |
8aee5d4e | 555 | const char *cipher_name; |
31865c4c HX |
556 | int err; |
557 | ||
558 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask); | |
559 | if (err) | |
560 | return ERR_PTR(err); | |
561 | ||
8aee5d4e HX |
562 | cipher_name = crypto_attr_alg_name(tb[1]); |
563 | if (IS_ERR(cipher_name)) | |
564 | return ERR_CAST(cipher_name); | |
565 | ||
31865c4c HX |
566 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
567 | if (!inst) | |
568 | return ERR_PTR(-ENOMEM); | |
569 | ||
570 | spawn = lskcipher_instance_ctx(inst); | |
571 | err = crypto_grab_lskcipher(spawn, | |
572 | lskcipher_crypto_instance(inst), | |
8aee5d4e HX |
573 | cipher_name, 0, mask); |
574 | ||
575 | ecb_name[0] = 0; | |
576 | if (err == -ENOENT && !!memcmp(tmpl->name, "ecb", 4)) { | |
577 | err = -ENAMETOOLONG; | |
578 | if (snprintf(ecb_name, CRYPTO_MAX_ALG_NAME, "ecb(%s)", | |
579 | cipher_name) >= CRYPTO_MAX_ALG_NAME) | |
580 | goto err_free_inst; | |
581 | ||
582 | err = crypto_grab_lskcipher(spawn, | |
583 | lskcipher_crypto_instance(inst), | |
584 | ecb_name, 0, mask); | |
585 | } | |
586 | ||
31865c4c HX |
587 | if (err) |
588 | goto err_free_inst; | |
8aee5d4e | 589 | |
31865c4c HX |
590 | cipher_alg = crypto_lskcipher_spawn_alg(spawn); |
591 | ||
592 | err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name, | |
593 | &cipher_alg->co.base); | |
594 | if (err) | |
595 | goto err_free_inst; | |
596 | ||
8aee5d4e HX |
597 | if (ecb_name[0]) { |
598 | int len; | |
599 | ||
87d6621c | 600 | err = -EINVAL; |
8aee5d4e HX |
601 | len = strscpy(ecb_name, &cipher_alg->co.base.cra_name[4], |
602 | sizeof(ecb_name)); | |
603 | if (len < 2) | |
604 | goto err_free_inst; | |
605 | ||
606 | if (ecb_name[len - 1] != ')') | |
607 | goto err_free_inst; | |
608 | ||
609 | ecb_name[len - 1] = 0; | |
610 | ||
611 | err = -ENAMETOOLONG; | |
612 | if (snprintf(inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
613 | "%s(%s)", tmpl->name, ecb_name) >= | |
614 | CRYPTO_MAX_ALG_NAME) | |
615 | goto err_free_inst; | |
616 | ||
617 | if (strcmp(ecb_name, cipher_name) && | |
618 | snprintf(inst->alg.co.base.cra_driver_name, | |
619 | CRYPTO_MAX_ALG_NAME, | |
620 | "%s(%s)", tmpl->name, cipher_name) >= | |
621 | CRYPTO_MAX_ALG_NAME) | |
622 | goto err_free_inst; | |
623 | } else { | |
624 | /* Don't allow nesting. */ | |
625 | err = -ELOOP; | |
626 | if ((cipher_alg->co.base.cra_flags & CRYPTO_ALG_INSTANCE)) | |
627 | goto err_free_inst; | |
628 | } | |
31865c4c HX |
629 | |
630 | err = -EINVAL; | |
631 | if (cipher_alg->co.ivsize) | |
632 | goto err_free_inst; | |
633 | ||
634 | inst->free = lskcipher_free_instance_simple; | |
635 | ||
636 | /* Default algorithm properties, can be overridden */ | |
637 | inst->alg.co.base.cra_blocksize = cipher_alg->co.base.cra_blocksize; | |
638 | inst->alg.co.base.cra_alignmask = cipher_alg->co.base.cra_alignmask; | |
639 | inst->alg.co.base.cra_priority = cipher_alg->co.base.cra_priority; | |
640 | inst->alg.co.min_keysize = cipher_alg->co.min_keysize; | |
641 | inst->alg.co.max_keysize = cipher_alg->co.max_keysize; | |
642 | inst->alg.co.ivsize = cipher_alg->co.base.cra_blocksize; | |
37c6fc32 | 643 | inst->alg.co.statesize = cipher_alg->co.statesize; |
31865c4c HX |
644 | |
645 | /* Use struct crypto_lskcipher * by default, can be overridden */ | |
646 | inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_lskcipher *); | |
647 | inst->alg.setkey = lskcipher_setkey_simple; | |
648 | inst->alg.init = lskcipher_init_tfm_simple; | |
649 | inst->alg.exit = lskcipher_exit_tfm_simple; | |
650 | ||
651 | return inst; | |
652 | ||
653 | err_free_inst: | |
654 | lskcipher_free_instance_simple(inst); | |
655 | return ERR_PTR(err); | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple); |