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Source at commit b386be689295730688885552666ea40b2e639b14 created 11 years 11 months ago. By Maarten ter Huurne, Revert "MIPS: JZ4740: reset: Initialize hibernate wakeup counters." | |
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1 | /* |
2 | * CCM: Counter with CBC-MAC |
3 | * |
4 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> |
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 | |
13 | #include <crypto/internal/aead.h> |
14 | #include <crypto/internal/skcipher.h> |
15 | #include <crypto/scatterwalk.h> |
16 | #include <linux/err.h> |
17 | #include <linux/init.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> |
20 | #include <linux/slab.h> |
21 | |
22 | #include "internal.h" |
23 | |
24 | struct ccm_instance_ctx { |
25 | struct crypto_skcipher_spawn ctr; |
26 | struct crypto_spawn cipher; |
27 | }; |
28 | |
29 | struct crypto_ccm_ctx { |
30 | struct crypto_cipher *cipher; |
31 | struct crypto_ablkcipher *ctr; |
32 | }; |
33 | |
34 | struct crypto_rfc4309_ctx { |
35 | struct crypto_aead *child; |
36 | u8 nonce[3]; |
37 | }; |
38 | |
39 | struct crypto_ccm_req_priv_ctx { |
40 | u8 odata[16]; |
41 | u8 idata[16]; |
42 | u8 auth_tag[16]; |
43 | u32 ilen; |
44 | u32 flags; |
45 | struct scatterlist src[2]; |
46 | struct scatterlist dst[2]; |
47 | struct ablkcipher_request abreq; |
48 | }; |
49 | |
50 | static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( |
51 | struct aead_request *req) |
52 | { |
53 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); |
54 | |
55 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); |
56 | } |
57 | |
58 | static int set_msg_len(u8 *block, unsigned int msglen, int csize) |
59 | { |
60 | __be32 data; |
61 | |
62 | memset(block, 0, csize); |
63 | block += csize; |
64 | |
65 | if (csize >= 4) |
66 | csize = 4; |
67 | else if (msglen > (1 << (8 * csize))) |
68 | return -EOVERFLOW; |
69 | |
70 | data = cpu_to_be32(msglen); |
71 | memcpy(block - csize, (u8 *)&data + 4 - csize, csize); |
72 | |
73 | return 0; |
74 | } |
75 | |
76 | static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, |
77 | unsigned int keylen) |
78 | { |
79 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
80 | struct crypto_ablkcipher *ctr = ctx->ctr; |
81 | struct crypto_cipher *tfm = ctx->cipher; |
82 | int err = 0; |
83 | |
84 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
85 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & |
86 | CRYPTO_TFM_REQ_MASK); |
87 | err = crypto_ablkcipher_setkey(ctr, key, keylen); |
88 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & |
89 | CRYPTO_TFM_RES_MASK); |
90 | if (err) |
91 | goto out; |
92 | |
93 | crypto_cipher_clear_flags(tfm, CRYPTO_TFM_REQ_MASK); |
94 | crypto_cipher_set_flags(tfm, crypto_aead_get_flags(aead) & |
95 | CRYPTO_TFM_REQ_MASK); |
96 | err = crypto_cipher_setkey(tfm, key, keylen); |
97 | crypto_aead_set_flags(aead, crypto_cipher_get_flags(tfm) & |
98 | CRYPTO_TFM_RES_MASK); |
99 | |
100 | out: |
101 | return err; |
102 | } |
103 | |
104 | static int crypto_ccm_setauthsize(struct crypto_aead *tfm, |
105 | unsigned int authsize) |
106 | { |
107 | switch (authsize) { |
108 | case 4: |
109 | case 6: |
110 | case 8: |
111 | case 10: |
112 | case 12: |
113 | case 14: |
114 | case 16: |
115 | break; |
116 | default: |
117 | return -EINVAL; |
118 | } |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | static int format_input(u8 *info, struct aead_request *req, |
124 | unsigned int cryptlen) |
125 | { |
126 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
127 | unsigned int lp = req->iv[0]; |
128 | unsigned int l = lp + 1; |
129 | unsigned int m; |
130 | |
131 | m = crypto_aead_authsize(aead); |
132 | |
133 | memcpy(info, req->iv, 16); |
134 | |
135 | /* format control info per RFC 3610 and |
136 | * NIST Special Publication 800-38C |
137 | */ |
138 | *info |= (8 * ((m - 2) / 2)); |
139 | if (req->assoclen) |
140 | *info |= 64; |
141 | |
142 | return set_msg_len(info + 16 - l, cryptlen, l); |
143 | } |
144 | |
145 | static int format_adata(u8 *adata, unsigned int a) |
146 | { |
147 | int len = 0; |
148 | |
149 | /* add control info for associated data |
150 | * RFC 3610 and NIST Special Publication 800-38C |
151 | */ |
152 | if (a < 65280) { |
153 | *(__be16 *)adata = cpu_to_be16(a); |
154 | len = 2; |
155 | } else { |
156 | *(__be16 *)adata = cpu_to_be16(0xfffe); |
157 | *(__be32 *)&adata[2] = cpu_to_be32(a); |
158 | len = 6; |
159 | } |
160 | |
161 | return len; |
162 | } |
163 | |
164 | static void compute_mac(struct crypto_cipher *tfm, u8 *data, int n, |
165 | struct crypto_ccm_req_priv_ctx *pctx) |
166 | { |
167 | unsigned int bs = 16; |
168 | u8 *odata = pctx->odata; |
169 | u8 *idata = pctx->idata; |
170 | int datalen, getlen; |
171 | |
172 | datalen = n; |
173 | |
174 | /* first time in here, block may be partially filled. */ |
175 | getlen = bs - pctx->ilen; |
176 | if (datalen >= getlen) { |
177 | memcpy(idata + pctx->ilen, data, getlen); |
178 | crypto_xor(odata, idata, bs); |
179 | crypto_cipher_encrypt_one(tfm, odata, odata); |
180 | datalen -= getlen; |
181 | data += getlen; |
182 | pctx->ilen = 0; |
183 | } |
184 | |
185 | /* now encrypt rest of data */ |
186 | while (datalen >= bs) { |
187 | crypto_xor(odata, data, bs); |
188 | crypto_cipher_encrypt_one(tfm, odata, odata); |
189 | |
190 | datalen -= bs; |
191 | data += bs; |
192 | } |
193 | |
194 | /* check and see if there's leftover data that wasn't |
195 | * enough to fill a block. |
196 | */ |
197 | if (datalen) { |
198 | memcpy(idata + pctx->ilen, data, datalen); |
199 | pctx->ilen += datalen; |
200 | } |
201 | } |
202 | |
203 | static void get_data_to_compute(struct crypto_cipher *tfm, |
204 | struct crypto_ccm_req_priv_ctx *pctx, |
205 | struct scatterlist *sg, unsigned int len) |
206 | { |
207 | struct scatter_walk walk; |
208 | u8 *data_src; |
209 | int n; |
210 | |
211 | scatterwalk_start(&walk, sg); |
212 | |
213 | while (len) { |
214 | n = scatterwalk_clamp(&walk, len); |
215 | if (!n) { |
216 | scatterwalk_start(&walk, sg_next(walk.sg)); |
217 | n = scatterwalk_clamp(&walk, len); |
218 | } |
219 | data_src = scatterwalk_map(&walk, 0); |
220 | |
221 | compute_mac(tfm, data_src, n, pctx); |
222 | len -= n; |
223 | |
224 | scatterwalk_unmap(data_src, 0); |
225 | scatterwalk_advance(&walk, n); |
226 | scatterwalk_done(&walk, 0, len); |
227 | if (len) |
228 | crypto_yield(pctx->flags); |
229 | } |
230 | |
231 | /* any leftover needs padding and then encrypted */ |
232 | if (pctx->ilen) { |
233 | int padlen; |
234 | u8 *odata = pctx->odata; |
235 | u8 *idata = pctx->idata; |
236 | |
237 | padlen = 16 - pctx->ilen; |
238 | memset(idata + pctx->ilen, 0, padlen); |
239 | crypto_xor(odata, idata, 16); |
240 | crypto_cipher_encrypt_one(tfm, odata, odata); |
241 | pctx->ilen = 0; |
242 | } |
243 | } |
244 | |
245 | static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, |
246 | unsigned int cryptlen) |
247 | { |
248 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
249 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
250 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
251 | struct crypto_cipher *cipher = ctx->cipher; |
252 | unsigned int assoclen = req->assoclen; |
253 | u8 *odata = pctx->odata; |
254 | u8 *idata = pctx->idata; |
255 | int err; |
256 | |
257 | /* format control data for input */ |
258 | err = format_input(odata, req, cryptlen); |
259 | if (err) |
260 | goto out; |
261 | |
262 | /* encrypt first block to use as start in computing mac */ |
263 | crypto_cipher_encrypt_one(cipher, odata, odata); |
264 | |
265 | /* format associated data and compute into mac */ |
266 | if (assoclen) { |
267 | pctx->ilen = format_adata(idata, assoclen); |
268 | get_data_to_compute(cipher, pctx, req->assoc, req->assoclen); |
269 | } else { |
270 | pctx->ilen = 0; |
271 | } |
272 | |
273 | /* compute plaintext into mac */ |
274 | get_data_to_compute(cipher, pctx, plain, cryptlen); |
275 | |
276 | out: |
277 | return err; |
278 | } |
279 | |
280 | static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err) |
281 | { |
282 | struct aead_request *req = areq->data; |
283 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
284 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
285 | u8 *odata = pctx->odata; |
286 | |
287 | if (!err) |
288 | scatterwalk_map_and_copy(odata, req->dst, req->cryptlen, |
289 | crypto_aead_authsize(aead), 1); |
290 | aead_request_complete(req, err); |
291 | } |
292 | |
293 | static inline int crypto_ccm_check_iv(const u8 *iv) |
294 | { |
295 | /* 2 <= L <= 8, so 1 <= L' <= 7. */ |
296 | if (1 > iv[0] || iv[0] > 7) |
297 | return -EINVAL; |
298 | |
299 | return 0; |
300 | } |
301 | |
302 | static int crypto_ccm_encrypt(struct aead_request *req) |
303 | { |
304 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
305 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
306 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
307 | struct ablkcipher_request *abreq = &pctx->abreq; |
308 | struct scatterlist *dst; |
309 | unsigned int cryptlen = req->cryptlen; |
310 | u8 *odata = pctx->odata; |
311 | u8 *iv = req->iv; |
312 | int err; |
313 | |
314 | err = crypto_ccm_check_iv(iv); |
315 | if (err) |
316 | return err; |
317 | |
318 | pctx->flags = aead_request_flags(req); |
319 | |
320 | err = crypto_ccm_auth(req, req->src, cryptlen); |
321 | if (err) |
322 | return err; |
323 | |
324 | /* Note: rfc 3610 and NIST 800-38C require counter of |
325 | * zero to encrypt auth tag. |
326 | */ |
327 | memset(iv + 15 - iv[0], 0, iv[0] + 1); |
328 | |
329 | sg_init_table(pctx->src, 2); |
330 | sg_set_buf(pctx->src, odata, 16); |
331 | scatterwalk_sg_chain(pctx->src, 2, req->src); |
332 | |
333 | dst = pctx->src; |
334 | if (req->src != req->dst) { |
335 | sg_init_table(pctx->dst, 2); |
336 | sg_set_buf(pctx->dst, odata, 16); |
337 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); |
338 | dst = pctx->dst; |
339 | } |
340 | |
341 | ablkcipher_request_set_tfm(abreq, ctx->ctr); |
342 | ablkcipher_request_set_callback(abreq, pctx->flags, |
343 | crypto_ccm_encrypt_done, req); |
344 | ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv); |
345 | err = crypto_ablkcipher_encrypt(abreq); |
346 | if (err) |
347 | return err; |
348 | |
349 | /* copy authtag to end of dst */ |
350 | scatterwalk_map_and_copy(odata, req->dst, cryptlen, |
351 | crypto_aead_authsize(aead), 1); |
352 | return err; |
353 | } |
354 | |
355 | static void crypto_ccm_decrypt_done(struct crypto_async_request *areq, |
356 | int err) |
357 | { |
358 | struct aead_request *req = areq->data; |
359 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
360 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
361 | unsigned int authsize = crypto_aead_authsize(aead); |
362 | unsigned int cryptlen = req->cryptlen - authsize; |
363 | |
364 | if (!err) { |
365 | err = crypto_ccm_auth(req, req->dst, cryptlen); |
366 | if (!err && memcmp(pctx->auth_tag, pctx->odata, authsize)) |
367 | err = -EBADMSG; |
368 | } |
369 | aead_request_complete(req, err); |
370 | } |
371 | |
372 | static int crypto_ccm_decrypt(struct aead_request *req) |
373 | { |
374 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
375 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); |
376 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
377 | struct ablkcipher_request *abreq = &pctx->abreq; |
378 | struct scatterlist *dst; |
379 | unsigned int authsize = crypto_aead_authsize(aead); |
380 | unsigned int cryptlen = req->cryptlen; |
381 | u8 *authtag = pctx->auth_tag; |
382 | u8 *odata = pctx->odata; |
383 | u8 *iv = req->iv; |
384 | int err; |
385 | |
386 | if (cryptlen < authsize) |
387 | return -EINVAL; |
388 | cryptlen -= authsize; |
389 | |
390 | err = crypto_ccm_check_iv(iv); |
391 | if (err) |
392 | return err; |
393 | |
394 | pctx->flags = aead_request_flags(req); |
395 | |
396 | scatterwalk_map_and_copy(authtag, req->src, cryptlen, authsize, 0); |
397 | |
398 | memset(iv + 15 - iv[0], 0, iv[0] + 1); |
399 | |
400 | sg_init_table(pctx->src, 2); |
401 | sg_set_buf(pctx->src, authtag, 16); |
402 | scatterwalk_sg_chain(pctx->src, 2, req->src); |
403 | |
404 | dst = pctx->src; |
405 | if (req->src != req->dst) { |
406 | sg_init_table(pctx->dst, 2); |
407 | sg_set_buf(pctx->dst, authtag, 16); |
408 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); |
409 | dst = pctx->dst; |
410 | } |
411 | |
412 | ablkcipher_request_set_tfm(abreq, ctx->ctr); |
413 | ablkcipher_request_set_callback(abreq, pctx->flags, |
414 | crypto_ccm_decrypt_done, req); |
415 | ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv); |
416 | err = crypto_ablkcipher_decrypt(abreq); |
417 | if (err) |
418 | return err; |
419 | |
420 | err = crypto_ccm_auth(req, req->dst, cryptlen); |
421 | if (err) |
422 | return err; |
423 | |
424 | /* verify */ |
425 | if (memcmp(authtag, odata, authsize)) |
426 | return -EBADMSG; |
427 | |
428 | return err; |
429 | } |
430 | |
431 | static int crypto_ccm_init_tfm(struct crypto_tfm *tfm) |
432 | { |
433 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
434 | struct ccm_instance_ctx *ictx = crypto_instance_ctx(inst); |
435 | struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm); |
436 | struct crypto_cipher *cipher; |
437 | struct crypto_ablkcipher *ctr; |
438 | unsigned long align; |
439 | int err; |
440 | |
441 | cipher = crypto_spawn_cipher(&ictx->cipher); |
442 | if (IS_ERR(cipher)) |
443 | return PTR_ERR(cipher); |
444 | |
445 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
446 | err = PTR_ERR(ctr); |
447 | if (IS_ERR(ctr)) |
448 | goto err_free_cipher; |
449 | |
450 | ctx->cipher = cipher; |
451 | ctx->ctr = ctr; |
452 | |
453 | align = crypto_tfm_alg_alignmask(tfm); |
454 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
455 | tfm->crt_aead.reqsize = align + |
456 | sizeof(struct crypto_ccm_req_priv_ctx) + |
457 | crypto_ablkcipher_reqsize(ctr); |
458 | |
459 | return 0; |
460 | |
461 | err_free_cipher: |
462 | crypto_free_cipher(cipher); |
463 | return err; |
464 | } |
465 | |
466 | static void crypto_ccm_exit_tfm(struct crypto_tfm *tfm) |
467 | { |
468 | struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm); |
469 | |
470 | crypto_free_cipher(ctx->cipher); |
471 | crypto_free_ablkcipher(ctx->ctr); |
472 | } |
473 | |
474 | static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb, |
475 | const char *full_name, |
476 | const char *ctr_name, |
477 | const char *cipher_name) |
478 | { |
479 | struct crypto_attr_type *algt; |
480 | struct crypto_instance *inst; |
481 | struct crypto_alg *ctr; |
482 | struct crypto_alg *cipher; |
483 | struct ccm_instance_ctx *ictx; |
484 | int err; |
485 | |
486 | algt = crypto_get_attr_type(tb); |
487 | err = PTR_ERR(algt); |
488 | if (IS_ERR(algt)) |
489 | return ERR_PTR(err); |
490 | |
491 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
492 | return ERR_PTR(-EINVAL); |
493 | |
494 | cipher = crypto_alg_mod_lookup(cipher_name, CRYPTO_ALG_TYPE_CIPHER, |
495 | CRYPTO_ALG_TYPE_MASK); |
496 | err = PTR_ERR(cipher); |
497 | if (IS_ERR(cipher)) |
498 | return ERR_PTR(err); |
499 | |
500 | err = -EINVAL; |
501 | if (cipher->cra_blocksize != 16) |
502 | goto out_put_cipher; |
503 | |
504 | inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); |
505 | err = -ENOMEM; |
506 | if (!inst) |
507 | goto out_put_cipher; |
508 | |
509 | ictx = crypto_instance_ctx(inst); |
510 | |
511 | err = crypto_init_spawn(&ictx->cipher, cipher, inst, |
512 | CRYPTO_ALG_TYPE_MASK); |
513 | if (err) |
514 | goto err_free_inst; |
515 | |
516 | crypto_set_skcipher_spawn(&ictx->ctr, inst); |
517 | err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0, |
518 | crypto_requires_sync(algt->type, |
519 | algt->mask)); |
520 | if (err) |
521 | goto err_drop_cipher; |
522 | |
523 | ctr = crypto_skcipher_spawn_alg(&ictx->ctr); |
524 | |
525 | /* Not a stream cipher? */ |
526 | err = -EINVAL; |
527 | if (ctr->cra_blocksize != 1) |
528 | goto err_drop_ctr; |
529 | |
530 | /* We want the real thing! */ |
531 | if (ctr->cra_ablkcipher.ivsize != 16) |
532 | goto err_drop_ctr; |
533 | |
534 | err = -ENAMETOOLONG; |
535 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
536 | "ccm_base(%s,%s)", ctr->cra_driver_name, |
537 | cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
538 | goto err_drop_ctr; |
539 | |
540 | memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
541 | |
542 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
543 | inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; |
544 | inst->alg.cra_priority = cipher->cra_priority + ctr->cra_priority; |
545 | inst->alg.cra_blocksize = 1; |
546 | inst->alg.cra_alignmask = cipher->cra_alignmask | ctr->cra_alignmask | |
547 | (__alignof__(u32) - 1); |
548 | inst->alg.cra_type = &crypto_aead_type; |
549 | inst->alg.cra_aead.ivsize = 16; |
550 | inst->alg.cra_aead.maxauthsize = 16; |
551 | inst->alg.cra_ctxsize = sizeof(struct crypto_ccm_ctx); |
552 | inst->alg.cra_init = crypto_ccm_init_tfm; |
553 | inst->alg.cra_exit = crypto_ccm_exit_tfm; |
554 | inst->alg.cra_aead.setkey = crypto_ccm_setkey; |
555 | inst->alg.cra_aead.setauthsize = crypto_ccm_setauthsize; |
556 | inst->alg.cra_aead.encrypt = crypto_ccm_encrypt; |
557 | inst->alg.cra_aead.decrypt = crypto_ccm_decrypt; |
558 | |
559 | out: |
560 | crypto_mod_put(cipher); |
561 | return inst; |
562 | |
563 | err_drop_ctr: |
564 | crypto_drop_skcipher(&ictx->ctr); |
565 | err_drop_cipher: |
566 | crypto_drop_spawn(&ictx->cipher); |
567 | err_free_inst: |
568 | kfree(inst); |
569 | out_put_cipher: |
570 | inst = ERR_PTR(err); |
571 | goto out; |
572 | } |
573 | |
574 | static struct crypto_instance *crypto_ccm_alloc(struct rtattr **tb) |
575 | { |
576 | int err; |
577 | const char *cipher_name; |
578 | char ctr_name[CRYPTO_MAX_ALG_NAME]; |
579 | char full_name[CRYPTO_MAX_ALG_NAME]; |
580 | |
581 | cipher_name = crypto_attr_alg_name(tb[1]); |
582 | err = PTR_ERR(cipher_name); |
583 | if (IS_ERR(cipher_name)) |
584 | return ERR_PTR(err); |
585 | |
586 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", |
587 | cipher_name) >= CRYPTO_MAX_ALG_NAME) |
588 | return ERR_PTR(-ENAMETOOLONG); |
589 | |
590 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >= |
591 | CRYPTO_MAX_ALG_NAME) |
592 | return ERR_PTR(-ENAMETOOLONG); |
593 | |
594 | return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name); |
595 | } |
596 | |
597 | static void crypto_ccm_free(struct crypto_instance *inst) |
598 | { |
599 | struct ccm_instance_ctx *ctx = crypto_instance_ctx(inst); |
600 | |
601 | crypto_drop_spawn(&ctx->cipher); |
602 | crypto_drop_skcipher(&ctx->ctr); |
603 | kfree(inst); |
604 | } |
605 | |
606 | static struct crypto_template crypto_ccm_tmpl = { |
607 | .name = "ccm", |
608 | .alloc = crypto_ccm_alloc, |
609 | .free = crypto_ccm_free, |
610 | .module = THIS_MODULE, |
611 | }; |
612 | |
613 | static struct crypto_instance *crypto_ccm_base_alloc(struct rtattr **tb) |
614 | { |
615 | int err; |
616 | const char *ctr_name; |
617 | const char *cipher_name; |
618 | char full_name[CRYPTO_MAX_ALG_NAME]; |
619 | |
620 | ctr_name = crypto_attr_alg_name(tb[1]); |
621 | err = PTR_ERR(ctr_name); |
622 | if (IS_ERR(ctr_name)) |
623 | return ERR_PTR(err); |
624 | |
625 | cipher_name = crypto_attr_alg_name(tb[2]); |
626 | err = PTR_ERR(cipher_name); |
627 | if (IS_ERR(cipher_name)) |
628 | return ERR_PTR(err); |
629 | |
630 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)", |
631 | ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME) |
632 | return ERR_PTR(-ENAMETOOLONG); |
633 | |
634 | return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name); |
635 | } |
636 | |
637 | static struct crypto_template crypto_ccm_base_tmpl = { |
638 | .name = "ccm_base", |
639 | .alloc = crypto_ccm_base_alloc, |
640 | .free = crypto_ccm_free, |
641 | .module = THIS_MODULE, |
642 | }; |
643 | |
644 | static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, |
645 | unsigned int keylen) |
646 | { |
647 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); |
648 | struct crypto_aead *child = ctx->child; |
649 | int err; |
650 | |
651 | if (keylen < 3) |
652 | return -EINVAL; |
653 | |
654 | keylen -= 3; |
655 | memcpy(ctx->nonce, key + keylen, 3); |
656 | |
657 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
658 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & |
659 | CRYPTO_TFM_REQ_MASK); |
660 | err = crypto_aead_setkey(child, key, keylen); |
661 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & |
662 | CRYPTO_TFM_RES_MASK); |
663 | |
664 | return err; |
665 | } |
666 | |
667 | static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, |
668 | unsigned int authsize) |
669 | { |
670 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); |
671 | |
672 | switch (authsize) { |
673 | case 8: |
674 | case 12: |
675 | case 16: |
676 | break; |
677 | default: |
678 | return -EINVAL; |
679 | } |
680 | |
681 | return crypto_aead_setauthsize(ctx->child, authsize); |
682 | } |
683 | |
684 | static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) |
685 | { |
686 | struct aead_request *subreq = aead_request_ctx(req); |
687 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
688 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); |
689 | struct crypto_aead *child = ctx->child; |
690 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
691 | crypto_aead_alignmask(child) + 1); |
692 | |
693 | /* L' */ |
694 | iv[0] = 3; |
695 | |
696 | memcpy(iv + 1, ctx->nonce, 3); |
697 | memcpy(iv + 4, req->iv, 8); |
698 | |
699 | aead_request_set_tfm(subreq, child); |
700 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, |
701 | req->base.data); |
702 | aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); |
703 | aead_request_set_assoc(subreq, req->assoc, req->assoclen); |
704 | |
705 | return subreq; |
706 | } |
707 | |
708 | static int crypto_rfc4309_encrypt(struct aead_request *req) |
709 | { |
710 | req = crypto_rfc4309_crypt(req); |
711 | |
712 | return crypto_aead_encrypt(req); |
713 | } |
714 | |
715 | static int crypto_rfc4309_decrypt(struct aead_request *req) |
716 | { |
717 | req = crypto_rfc4309_crypt(req); |
718 | |
719 | return crypto_aead_decrypt(req); |
720 | } |
721 | |
722 | static int crypto_rfc4309_init_tfm(struct crypto_tfm *tfm) |
723 | { |
724 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
725 | struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); |
726 | struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm); |
727 | struct crypto_aead *aead; |
728 | unsigned long align; |
729 | |
730 | aead = crypto_spawn_aead(spawn); |
731 | if (IS_ERR(aead)) |
732 | return PTR_ERR(aead); |
733 | |
734 | ctx->child = aead; |
735 | |
736 | align = crypto_aead_alignmask(aead); |
737 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
738 | tfm->crt_aead.reqsize = sizeof(struct aead_request) + |
739 | ALIGN(crypto_aead_reqsize(aead), |
740 | crypto_tfm_ctx_alignment()) + |
741 | align + 16; |
742 | |
743 | return 0; |
744 | } |
745 | |
746 | static void crypto_rfc4309_exit_tfm(struct crypto_tfm *tfm) |
747 | { |
748 | struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm); |
749 | |
750 | crypto_free_aead(ctx->child); |
751 | } |
752 | |
753 | static struct crypto_instance *crypto_rfc4309_alloc(struct rtattr **tb) |
754 | { |
755 | struct crypto_attr_type *algt; |
756 | struct crypto_instance *inst; |
757 | struct crypto_aead_spawn *spawn; |
758 | struct crypto_alg *alg; |
759 | const char *ccm_name; |
760 | int err; |
761 | |
762 | algt = crypto_get_attr_type(tb); |
763 | err = PTR_ERR(algt); |
764 | if (IS_ERR(algt)) |
765 | return ERR_PTR(err); |
766 | |
767 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
768 | return ERR_PTR(-EINVAL); |
769 | |
770 | ccm_name = crypto_attr_alg_name(tb[1]); |
771 | err = PTR_ERR(ccm_name); |
772 | if (IS_ERR(ccm_name)) |
773 | return ERR_PTR(err); |
774 | |
775 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
776 | if (!inst) |
777 | return ERR_PTR(-ENOMEM); |
778 | |
779 | spawn = crypto_instance_ctx(inst); |
780 | crypto_set_aead_spawn(spawn, inst); |
781 | err = crypto_grab_aead(spawn, ccm_name, 0, |
782 | crypto_requires_sync(algt->type, algt->mask)); |
783 | if (err) |
784 | goto out_free_inst; |
785 | |
786 | alg = crypto_aead_spawn_alg(spawn); |
787 | |
788 | err = -EINVAL; |
789 | |
790 | /* We only support 16-byte blocks. */ |
791 | if (alg->cra_aead.ivsize != 16) |
792 | goto out_drop_alg; |
793 | |
794 | /* Not a stream cipher? */ |
795 | if (alg->cra_blocksize != 1) |
796 | goto out_drop_alg; |
797 | |
798 | err = -ENAMETOOLONG; |
799 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
800 | "rfc4309(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || |
801 | snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
802 | "rfc4309(%s)", alg->cra_driver_name) >= |
803 | CRYPTO_MAX_ALG_NAME) |
804 | goto out_drop_alg; |
805 | |
806 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
807 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; |
808 | inst->alg.cra_priority = alg->cra_priority; |
809 | inst->alg.cra_blocksize = 1; |
810 | inst->alg.cra_alignmask = alg->cra_alignmask; |
811 | inst->alg.cra_type = &crypto_nivaead_type; |
812 | |
813 | inst->alg.cra_aead.ivsize = 8; |
814 | inst->alg.cra_aead.maxauthsize = 16; |
815 | |
816 | inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); |
817 | |
818 | inst->alg.cra_init = crypto_rfc4309_init_tfm; |
819 | inst->alg.cra_exit = crypto_rfc4309_exit_tfm; |
820 | |
821 | inst->alg.cra_aead.setkey = crypto_rfc4309_setkey; |
822 | inst->alg.cra_aead.setauthsize = crypto_rfc4309_setauthsize; |
823 | inst->alg.cra_aead.encrypt = crypto_rfc4309_encrypt; |
824 | inst->alg.cra_aead.decrypt = crypto_rfc4309_decrypt; |
825 | |
826 | inst->alg.cra_aead.geniv = "seqiv"; |
827 | |
828 | out: |
829 | return inst; |
830 | |
831 | out_drop_alg: |
832 | crypto_drop_aead(spawn); |
833 | out_free_inst: |
834 | kfree(inst); |
835 | inst = ERR_PTR(err); |
836 | goto out; |
837 | } |
838 | |
839 | static void crypto_rfc4309_free(struct crypto_instance *inst) |
840 | { |
841 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
842 | kfree(inst); |
843 | } |
844 | |
845 | static struct crypto_template crypto_rfc4309_tmpl = { |
846 | .name = "rfc4309", |
847 | .alloc = crypto_rfc4309_alloc, |
848 | .free = crypto_rfc4309_free, |
849 | .module = THIS_MODULE, |
850 | }; |
851 | |
852 | static int __init crypto_ccm_module_init(void) |
853 | { |
854 | int err; |
855 | |
856 | err = crypto_register_template(&crypto_ccm_base_tmpl); |
857 | if (err) |
858 | goto out; |
859 | |
860 | err = crypto_register_template(&crypto_ccm_tmpl); |
861 | if (err) |
862 | goto out_undo_base; |
863 | |
864 | err = crypto_register_template(&crypto_rfc4309_tmpl); |
865 | if (err) |
866 | goto out_undo_ccm; |
867 | |
868 | out: |
869 | return err; |
870 | |
871 | out_undo_ccm: |
872 | crypto_unregister_template(&crypto_ccm_tmpl); |
873 | out_undo_base: |
874 | crypto_unregister_template(&crypto_ccm_base_tmpl); |
875 | goto out; |
876 | } |
877 | |
878 | static void __exit crypto_ccm_module_exit(void) |
879 | { |
880 | crypto_unregister_template(&crypto_rfc4309_tmpl); |
881 | crypto_unregister_template(&crypto_ccm_tmpl); |
882 | crypto_unregister_template(&crypto_ccm_base_tmpl); |
883 | } |
884 | |
885 | module_init(crypto_ccm_module_init); |
886 | module_exit(crypto_ccm_module_exit); |
887 | |
888 | MODULE_LICENSE("GPL"); |
889 | MODULE_DESCRIPTION("Counter with CBC MAC"); |
890 | MODULE_ALIAS("ccm_base"); |
891 | MODULE_ALIAS("rfc4309"); |
892 |
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