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: &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(v: &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(size: 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(objp: 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, |
91 | u8 *dst, unsigned len, u8 *iv, u32 flags)) |
92 | { |
93 | unsigned statesize = crypto_lskcipher_statesize(tfm); |
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 | |
108 | memcpy(tiv, iv, ivsize + statesize); |
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); |
123 | err = crypt(tfm, p, p, chunk, tiv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
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: |
136 | memcpy(iv, tiv, ivsize + statesize); |
137 | kfree_sensitive(objp: p); |
138 | kfree_sensitive(objp: 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, |
147 | u32 flags)) |
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 | |
160 | ret = crypt(tfm, src, dst, len, iv, CRYPTO_LSKCIPHER_FLAG_FINAL); |
161 | |
162 | out: |
163 | return crypto_lskcipher_errstat(alg, err: 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(v: &istat->encrypt_cnt); |
175 | atomic64_add(i: len, v: &istat->encrypt_tlen); |
176 | } |
177 | |
178 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, crypt: 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(v: &istat->decrypt_cnt); |
191 | atomic64_add(i: len, v: &istat->decrypt_tlen); |
192 | } |
193 | |
194 | return crypto_lskcipher_crypt(tfm, src, dst, len, iv, crypt: alg->decrypt); |
195 | } |
196 | EXPORT_SYMBOL_GPL(crypto_lskcipher_decrypt); |
197 | |
198 | static int crypto_lskcipher_crypt_sg(struct skcipher_request *req, |
199 | int (*crypt)(struct crypto_lskcipher *tfm, |
200 | const u8 *src, u8 *dst, |
201 | unsigned len, u8 *ivs, |
202 | u32 flags)) |
203 | { |
204 | struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req); |
205 | struct crypto_lskcipher **ctx = crypto_skcipher_ctx(tfm: skcipher); |
206 | u8 *ivs = skcipher_request_ctx(req); |
207 | struct crypto_lskcipher *tfm = *ctx; |
208 | struct skcipher_walk walk; |
209 | unsigned ivsize; |
210 | u32 flags; |
211 | int err; |
212 | |
213 | ivsize = crypto_lskcipher_ivsize(tfm); |
214 | ivs = PTR_ALIGN(ivs, crypto_skcipher_alignmask(skcipher) + 1); |
215 | memcpy(ivs, req->iv, ivsize); |
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; |
221 | |
222 | if (!(req->base.flags & CRYPTO_SKCIPHER_REQ_NOTFINAL)) |
223 | flags |= CRYPTO_LSKCIPHER_FLAG_FINAL; |
224 | |
225 | err = skcipher_walk_virt(walk: &walk, req, atomic: false); |
226 | |
227 | while (walk.nbytes) { |
228 | err = crypt(tfm, walk.src.virt.addr, walk.dst.virt.addr, |
229 | walk.nbytes, ivs, |
230 | flags & ~(walk.nbytes == walk.total ? |
231 | 0 : CRYPTO_LSKCIPHER_FLAG_FINAL)); |
232 | err = skcipher_walk_done(walk: &walk, err); |
233 | flags |= CRYPTO_LSKCIPHER_FLAG_CONT; |
234 | } |
235 | |
236 | memcpy(req->iv, ivs, ivsize); |
237 | |
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(tfm: skcipher); |
245 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm: *ctx); |
246 | |
247 | return crypto_lskcipher_crypt_sg(req, crypt: 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(tfm: skcipher); |
254 | struct lskcipher_alg *alg = crypto_lskcipher_alg(tfm: *ctx); |
255 | |
256 | return crypto_lskcipher_crypt_sg(req, crypt: 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(tfm: 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(tfm: 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, fmt: "type : lskcipher\n" ); |
295 | seq_printf(m, fmt: "blocksize : %u\n" , alg->cra_blocksize); |
296 | seq_printf(m, fmt: "min keysize : %u\n" , skcipher->co.min_keysize); |
297 | seq_printf(m, fmt: "max keysize : %u\n" , skcipher->co.max_keysize); |
298 | seq_printf(m, fmt: "ivsize : %u\n" , skcipher->co.ivsize); |
299 | seq_printf(m, fmt: "chunksize : %u\n" , skcipher->co.chunksize); |
300 | seq_printf(m, fmt: "statesize : %u\n" , skcipher->co.statesize); |
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, attrtype: CRYPTOCFGA_REPORT_BLKCIPHER, |
320 | attrlen: sizeof(rblkcipher), data: &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(alg: 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(v: &istat->encrypt_cnt); |
337 | rcipher.stat_encrypt_tlen = atomic64_read(v: &istat->encrypt_tlen); |
338 | rcipher.stat_decrypt_cnt = atomic64_read(v: &istat->decrypt_cnt); |
339 | rcipher.stat_decrypt_tlen = atomic64_read(v: &istat->decrypt_tlen); |
340 | rcipher.stat_err_cnt = atomic64_read(v: &istat->err_cnt); |
341 | |
342 | return nla_put(skb, attrtype: CRYPTOCFGA_STAT_CIPHER, attrlen: sizeof(rcipher), data: &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(tfm: *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(alg: calg)) |
378 | return -EAGAIN; |
379 | |
380 | skcipher = crypto_create_tfm(alg: calg, frontend: &crypto_lskcipher_type); |
381 | if (IS_ERR(ptr: skcipher)) { |
382 | crypto_mod_put(alg: calg); |
383 | return PTR_ERR(ptr: 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: &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, frontend: &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: &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(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: &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(alg: &inst->alg); |
483 | if (err) |
484 | return err; |
485 | |
486 | return crypto_register_instance(tmpl, inst: 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(tfm: cipher, CRYPTO_TFM_REQ_MASK); |
496 | crypto_lskcipher_set_flags(tfm: cipher, flags: 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(lskcipher: 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(ptr: cipher)) |
511 | return PTR_ERR(ptr: 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(tfm: *ctx); |
522 | } |
523 | |
524 | static void lskcipher_free_instance_simple(struct lskcipher_instance *inst) |
525 | { |
526 | crypto_drop_lskcipher(spawn: lskcipher_instance_ctx(inst)); |
527 | kfree(objp: 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; |
553 | char ecb_name[CRYPTO_MAX_ALG_NAME]; |
554 | struct lskcipher_alg *cipher_alg; |
555 | const char *cipher_name; |
556 | int err; |
557 | |
558 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, mask_ret: &mask); |
559 | if (err) |
560 | return ERR_PTR(error: err); |
561 | |
562 | cipher_name = crypto_attr_alg_name(rta: tb[1]); |
563 | if (IS_ERR(ptr: cipher_name)) |
564 | return ERR_CAST(ptr: cipher_name); |
565 | |
566 | inst = kzalloc(size: sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
567 | if (!inst) |
568 | return ERR_PTR(error: -ENOMEM); |
569 | |
570 | spawn = lskcipher_instance_ctx(inst); |
571 | err = crypto_grab_lskcipher(spawn, |
572 | lskcipher_crypto_instance(inst), |
573 | cipher_name, 0, mask); |
574 | |
575 | ecb_name[0] = 0; |
576 | if (err == -ENOENT && !!memcmp(p: tmpl->name, q: "ecb" , size: 4)) { |
577 | err = -ENAMETOOLONG; |
578 | if (snprintf(buf: ecb_name, CRYPTO_MAX_ALG_NAME, fmt: "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 | |
587 | if (err) |
588 | goto err_free_inst; |
589 | |
590 | cipher_alg = crypto_lskcipher_spawn_alg(spawn); |
591 | |
592 | err = crypto_inst_setname(inst: lskcipher_crypto_instance(inst), name: tmpl->name, |
593 | alg: &cipher_alg->co.base); |
594 | if (err) |
595 | goto err_free_inst; |
596 | |
597 | if (ecb_name[0]) { |
598 | int len; |
599 | |
600 | err = -EINVAL; |
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(buf: inst->alg.co.base.cra_name, CRYPTO_MAX_ALG_NAME, |
613 | fmt: "%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(buf: inst->alg.co.base.cra_driver_name, |
619 | CRYPTO_MAX_ALG_NAME, |
620 | fmt: "%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 | } |
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; |
643 | inst->alg.co.statesize = cipher_alg->co.statesize; |
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(error: err); |
656 | } |
657 | EXPORT_SYMBOL_GPL(lskcipher_alloc_instance_simple); |
658 | |