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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
24struct ccm_instance_ctx {
25 struct crypto_skcipher_spawn ctr;
26 struct crypto_spawn cipher;
27};
28
29struct crypto_ccm_ctx {
30 struct crypto_cipher *cipher;
31 struct crypto_ablkcipher *ctr;
32};
33
34struct crypto_rfc4309_ctx {
35 struct crypto_aead *child;
36 u8 nonce[3];
37};
38
39struct 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
50static 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
58static 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
76static 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
100out:
101 return err;
102}
103
104static 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
123static 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
136
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
145static int format_adata(u8 *adata, unsigned int a)
146{
147 int len = 0;
148
149
150
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
164static 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
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
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
195
196
197 if (datalen) {
198 memcpy(idata + pctx->ilen, data, datalen);
199 pctx->ilen += datalen;
200 }
201}
202
203static 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);
220
221 compute_mac(tfm, data_src, n, pctx);
222 len -= n;
223
224 scatterwalk_unmap(data_src);
225 scatterwalk_advance(&walk, n);
226 scatterwalk_done(&walk, 0, len);
227 if (len)
228 crypto_yield(pctx->flags);
229 }
230
231
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
245static 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
258 err = format_input(odata, req, cryptlen);
259 if (err)
260 goto out;
261
262
263 crypto_cipher_encrypt_one(cipher, odata, odata);
264
265
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
274 if (cryptlen)
275 get_data_to_compute(cipher, pctx, plain, cryptlen);
276
277out:
278 return err;
279}
280
281static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
282{
283 struct aead_request *req = areq->data;
284 struct crypto_aead *aead = crypto_aead_reqtfm(req);
285 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
286 u8 *odata = pctx->odata;
287
288 if (!err)
289 scatterwalk_map_and_copy(odata, req->dst, req->cryptlen,
290 crypto_aead_authsize(aead), 1);
291 aead_request_complete(req, err);
292}
293
294static inline int crypto_ccm_check_iv(const u8 *iv)
295{
296
297 if (1 > iv[0] || iv[0] > 7)
298 return -EINVAL;
299
300 return 0;
301}
302
303static int crypto_ccm_encrypt(struct aead_request *req)
304{
305 struct crypto_aead *aead = crypto_aead_reqtfm(req);
306 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
307 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
308 struct ablkcipher_request *abreq = &pctx->abreq;
309 struct scatterlist *dst;
310 unsigned int cryptlen = req->cryptlen;
311 u8 *odata = pctx->odata;
312 u8 *iv = req->iv;
313 int err;
314
315 err = crypto_ccm_check_iv(iv);
316 if (err)
317 return err;
318
319 pctx->flags = aead_request_flags(req);
320
321 err = crypto_ccm_auth(req, req->src, cryptlen);
322 if (err)
323 return err;
324
325
326
327
328 memset(iv + 15 - iv[0], 0, iv[0] + 1);
329
330 sg_init_table(pctx->src, 2);
331 sg_set_buf(pctx->src, odata, 16);
332 scatterwalk_sg_chain(pctx->src, 2, req->src);
333
334 dst = pctx->src;
335 if (req->src != req->dst) {
336 sg_init_table(pctx->dst, 2);
337 sg_set_buf(pctx->dst, odata, 16);
338 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
339 dst = pctx->dst;
340 }
341
342 ablkcipher_request_set_tfm(abreq, ctx->ctr);
343 ablkcipher_request_set_callback(abreq, pctx->flags,
344 crypto_ccm_encrypt_done, req);
345 ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
346 err = crypto_ablkcipher_encrypt(abreq);
347 if (err)
348 return err;
349
350
351 scatterwalk_map_and_copy(odata, req->dst, cryptlen,
352 crypto_aead_authsize(aead), 1);
353 return err;
354}
355
356static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
357 int err)
358{
359 struct aead_request *req = areq->data;
360 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
361 struct crypto_aead *aead = crypto_aead_reqtfm(req);
362 unsigned int authsize = crypto_aead_authsize(aead);
363 unsigned int cryptlen = req->cryptlen - authsize;
364
365 if (!err) {
366 err = crypto_ccm_auth(req, req->dst, cryptlen);
367 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
368 err = -EBADMSG;
369 }
370 aead_request_complete(req, err);
371}
372
373static int crypto_ccm_decrypt(struct aead_request *req)
374{
375 struct crypto_aead *aead = crypto_aead_reqtfm(req);
376 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
377 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
378 struct ablkcipher_request *abreq = &pctx->abreq;
379 struct scatterlist *dst;
380 unsigned int authsize = crypto_aead_authsize(aead);
381 unsigned int cryptlen = req->cryptlen;
382 u8 *authtag = pctx->auth_tag;
383 u8 *odata = pctx->odata;
384 u8 *iv = req->iv;
385 int err;
386
387 if (cryptlen < authsize)
388 return -EINVAL;
389 cryptlen -= authsize;
390
391 err = crypto_ccm_check_iv(iv);
392 if (err)
393 return err;
394
395 pctx->flags = aead_request_flags(req);
396
397 scatterwalk_map_and_copy(authtag, req->src, cryptlen, authsize, 0);
398
399 memset(iv + 15 - iv[0], 0, iv[0] + 1);
400
401 sg_init_table(pctx->src, 2);
402 sg_set_buf(pctx->src, authtag, 16);
403 scatterwalk_sg_chain(pctx->src, 2, req->src);
404
405 dst = pctx->src;
406 if (req->src != req->dst) {
407 sg_init_table(pctx->dst, 2);
408 sg_set_buf(pctx->dst, authtag, 16);
409 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
410 dst = pctx->dst;
411 }
412
413 ablkcipher_request_set_tfm(abreq, ctx->ctr);
414 ablkcipher_request_set_callback(abreq, pctx->flags,
415 crypto_ccm_decrypt_done, req);
416 ablkcipher_request_set_crypt(abreq, pctx->src, dst, cryptlen + 16, iv);
417 err = crypto_ablkcipher_decrypt(abreq);
418 if (err)
419 return err;
420
421 err = crypto_ccm_auth(req, req->dst, cryptlen);
422 if (err)
423 return err;
424
425
426 if (crypto_memneq(authtag, odata, authsize))
427 return -EBADMSG;
428
429 return err;
430}
431
432static int crypto_ccm_init_tfm(struct crypto_tfm *tfm)
433{
434 struct crypto_instance *inst = (void *)tfm->__crt_alg;
435 struct ccm_instance_ctx *ictx = crypto_instance_ctx(inst);
436 struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
437 struct crypto_cipher *cipher;
438 struct crypto_ablkcipher *ctr;
439 unsigned long align;
440 int err;
441
442 cipher = crypto_spawn_cipher(&ictx->cipher);
443 if (IS_ERR(cipher))
444 return PTR_ERR(cipher);
445
446 ctr = crypto_spawn_skcipher(&ictx->ctr);
447 err = PTR_ERR(ctr);
448 if (IS_ERR(ctr))
449 goto err_free_cipher;
450
451 ctx->cipher = cipher;
452 ctx->ctr = ctr;
453
454 align = crypto_tfm_alg_alignmask(tfm);
455 align &= ~(crypto_tfm_ctx_alignment() - 1);
456 tfm->crt_aead.reqsize = align +
457 sizeof(struct crypto_ccm_req_priv_ctx) +
458 crypto_ablkcipher_reqsize(ctr);
459
460 return 0;
461
462err_free_cipher:
463 crypto_free_cipher(cipher);
464 return err;
465}
466
467static void crypto_ccm_exit_tfm(struct crypto_tfm *tfm)
468{
469 struct crypto_ccm_ctx *ctx = crypto_tfm_ctx(tfm);
470
471 crypto_free_cipher(ctx->cipher);
472 crypto_free_ablkcipher(ctx->ctr);
473}
474
475static struct crypto_instance *crypto_ccm_alloc_common(struct rtattr **tb,
476 const char *full_name,
477 const char *ctr_name,
478 const char *cipher_name)
479{
480 struct crypto_attr_type *algt;
481 struct crypto_instance *inst;
482 struct crypto_alg *ctr;
483 struct crypto_alg *cipher;
484 struct ccm_instance_ctx *ictx;
485 int err;
486
487 algt = crypto_get_attr_type(tb);
488 if (IS_ERR(algt))
489 return ERR_CAST(algt);
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 if (IS_ERR(cipher))
497 return ERR_CAST(cipher);
498
499 err = -EINVAL;
500 if (cipher->cra_blocksize != 16)
501 goto out_put_cipher;
502
503 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
504 err = -ENOMEM;
505 if (!inst)
506 goto out_put_cipher;
507
508 ictx = crypto_instance_ctx(inst);
509
510 err = crypto_init_spawn(&ictx->cipher, cipher, inst,
511 CRYPTO_ALG_TYPE_MASK);
512 if (err)
513 goto err_free_inst;
514
515 crypto_set_skcipher_spawn(&ictx->ctr, inst);
516 err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
517 crypto_requires_sync(algt->type,
518 algt->mask));
519 if (err)
520 goto err_drop_cipher;
521
522 ctr = crypto_skcipher_spawn_alg(&ictx->ctr);
523
524
525 err = -EINVAL;
526 if (ctr->cra_blocksize != 1)
527 goto err_drop_ctr;
528
529
530 if (ctr->cra_ablkcipher.ivsize != 16)
531 goto err_drop_ctr;
532
533 err = -ENAMETOOLONG;
534 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
535 "ccm_base(%s,%s)", ctr->cra_driver_name,
536 cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
537 goto err_drop_ctr;
538
539 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
540
541 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
542 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
543 inst->alg.cra_priority = cipher->cra_priority + ctr->cra_priority;
544 inst->alg.cra_blocksize = 1;
545 inst->alg.cra_alignmask = cipher->cra_alignmask | ctr->cra_alignmask |
546 (__alignof__(u32) - 1);
547 inst->alg.cra_type = &crypto_aead_type;
548 inst->alg.cra_aead.ivsize = 16;
549 inst->alg.cra_aead.maxauthsize = 16;
550 inst->alg.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
551 inst->alg.cra_init = crypto_ccm_init_tfm;
552 inst->alg.cra_exit = crypto_ccm_exit_tfm;
553 inst->alg.cra_aead.setkey = crypto_ccm_setkey;
554 inst->alg.cra_aead.setauthsize = crypto_ccm_setauthsize;
555 inst->alg.cra_aead.encrypt = crypto_ccm_encrypt;
556 inst->alg.cra_aead.decrypt = crypto_ccm_decrypt;
557
558out:
559 crypto_mod_put(cipher);
560 return inst;
561
562err_drop_ctr:
563 crypto_drop_skcipher(&ictx->ctr);
564err_drop_cipher:
565 crypto_drop_spawn(&ictx->cipher);
566err_free_inst:
567 kfree(inst);
568out_put_cipher:
569 inst = ERR_PTR(err);
570 goto out;
571}
572
573static struct crypto_instance *crypto_ccm_alloc(struct rtattr **tb)
574{
575 const char *cipher_name;
576 char ctr_name[CRYPTO_MAX_ALG_NAME];
577 char full_name[CRYPTO_MAX_ALG_NAME];
578
579 cipher_name = crypto_attr_alg_name(tb[1]);
580 if (IS_ERR(cipher_name))
581 return ERR_CAST(cipher_name);
582
583 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
584 cipher_name) >= CRYPTO_MAX_ALG_NAME)
585 return ERR_PTR(-ENAMETOOLONG);
586
587 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
588 CRYPTO_MAX_ALG_NAME)
589 return ERR_PTR(-ENAMETOOLONG);
590
591 return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
592}
593
594static void crypto_ccm_free(struct crypto_instance *inst)
595{
596 struct ccm_instance_ctx *ctx = crypto_instance_ctx(inst);
597
598 crypto_drop_spawn(&ctx->cipher);
599 crypto_drop_skcipher(&ctx->ctr);
600 kfree(inst);
601}
602
603static struct crypto_template crypto_ccm_tmpl = {
604 .name = "ccm",
605 .alloc = crypto_ccm_alloc,
606 .free = crypto_ccm_free,
607 .module = THIS_MODULE,
608};
609
610static struct crypto_instance *crypto_ccm_base_alloc(struct rtattr **tb)
611{
612 const char *ctr_name;
613 const char *cipher_name;
614 char full_name[CRYPTO_MAX_ALG_NAME];
615
616 ctr_name = crypto_attr_alg_name(tb[1]);
617 if (IS_ERR(ctr_name))
618 return ERR_CAST(ctr_name);
619
620 cipher_name = crypto_attr_alg_name(tb[2]);
621 if (IS_ERR(cipher_name))
622 return ERR_CAST(cipher_name);
623
624 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
625 ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
626 return ERR_PTR(-ENAMETOOLONG);
627
628 return crypto_ccm_alloc_common(tb, full_name, ctr_name, cipher_name);
629}
630
631static struct crypto_template crypto_ccm_base_tmpl = {
632 .name = "ccm_base",
633 .alloc = crypto_ccm_base_alloc,
634 .free = crypto_ccm_free,
635 .module = THIS_MODULE,
636};
637
638static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
639 unsigned int keylen)
640{
641 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
642 struct crypto_aead *child = ctx->child;
643 int err;
644
645 if (keylen < 3)
646 return -EINVAL;
647
648 keylen -= 3;
649 memcpy(ctx->nonce, key + keylen, 3);
650
651 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
652 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
653 CRYPTO_TFM_REQ_MASK);
654 err = crypto_aead_setkey(child, key, keylen);
655 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
656 CRYPTO_TFM_RES_MASK);
657
658 return err;
659}
660
661static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
662 unsigned int authsize)
663{
664 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
665
666 switch (authsize) {
667 case 8:
668 case 12:
669 case 16:
670 break;
671 default:
672 return -EINVAL;
673 }
674
675 return crypto_aead_setauthsize(ctx->child, authsize);
676}
677
678static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
679{
680 struct aead_request *subreq = aead_request_ctx(req);
681 struct crypto_aead *aead = crypto_aead_reqtfm(req);
682 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
683 struct crypto_aead *child = ctx->child;
684 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
685 crypto_aead_alignmask(child) + 1);
686
687
688 iv[0] = 3;
689
690 memcpy(iv + 1, ctx->nonce, 3);
691 memcpy(iv + 4, req->iv, 8);
692
693 aead_request_set_tfm(subreq, child);
694 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
695 req->base.data);
696 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
697 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
698
699 return subreq;
700}
701
702static int crypto_rfc4309_encrypt(struct aead_request *req)
703{
704 req = crypto_rfc4309_crypt(req);
705
706 return crypto_aead_encrypt(req);
707}
708
709static int crypto_rfc4309_decrypt(struct aead_request *req)
710{
711 req = crypto_rfc4309_crypt(req);
712
713 return crypto_aead_decrypt(req);
714}
715
716static int crypto_rfc4309_init_tfm(struct crypto_tfm *tfm)
717{
718 struct crypto_instance *inst = (void *)tfm->__crt_alg;
719 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
720 struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
721 struct crypto_aead *aead;
722 unsigned long align;
723
724 aead = crypto_spawn_aead(spawn);
725 if (IS_ERR(aead))
726 return PTR_ERR(aead);
727
728 ctx->child = aead;
729
730 align = crypto_aead_alignmask(aead);
731 align &= ~(crypto_tfm_ctx_alignment() - 1);
732 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
733 ALIGN(crypto_aead_reqsize(aead),
734 crypto_tfm_ctx_alignment()) +
735 align + 16;
736
737 return 0;
738}
739
740static void crypto_rfc4309_exit_tfm(struct crypto_tfm *tfm)
741{
742 struct crypto_rfc4309_ctx *ctx = crypto_tfm_ctx(tfm);
743
744 crypto_free_aead(ctx->child);
745}
746
747static struct crypto_instance *crypto_rfc4309_alloc(struct rtattr **tb)
748{
749 struct crypto_attr_type *algt;
750 struct crypto_instance *inst;
751 struct crypto_aead_spawn *spawn;
752 struct crypto_alg *alg;
753 const char *ccm_name;
754 int err;
755
756 algt = crypto_get_attr_type(tb);
757 if (IS_ERR(algt))
758 return ERR_CAST(algt);
759
760 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
761 return ERR_PTR(-EINVAL);
762
763 ccm_name = crypto_attr_alg_name(tb[1]);
764 if (IS_ERR(ccm_name))
765 return ERR_CAST(ccm_name);
766
767 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
768 if (!inst)
769 return ERR_PTR(-ENOMEM);
770
771 spawn = crypto_instance_ctx(inst);
772 crypto_set_aead_spawn(spawn, inst);
773 err = crypto_grab_aead(spawn, ccm_name, 0,
774 crypto_requires_sync(algt->type, algt->mask));
775 if (err)
776 goto out_free_inst;
777
778 alg = crypto_aead_spawn_alg(spawn);
779
780 err = -EINVAL;
781
782
783 if (alg->cra_aead.ivsize != 16)
784 goto out_drop_alg;
785
786
787 if (alg->cra_blocksize != 1)
788 goto out_drop_alg;
789
790 err = -ENAMETOOLONG;
791 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
792 "rfc4309(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
793 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
794 "rfc4309(%s)", alg->cra_driver_name) >=
795 CRYPTO_MAX_ALG_NAME)
796 goto out_drop_alg;
797
798 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
799 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
800 inst->alg.cra_priority = alg->cra_priority;
801 inst->alg.cra_blocksize = 1;
802 inst->alg.cra_alignmask = alg->cra_alignmask;
803 inst->alg.cra_type = &crypto_nivaead_type;
804
805 inst->alg.cra_aead.ivsize = 8;
806 inst->alg.cra_aead.maxauthsize = 16;
807
808 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
809
810 inst->alg.cra_init = crypto_rfc4309_init_tfm;
811 inst->alg.cra_exit = crypto_rfc4309_exit_tfm;
812
813 inst->alg.cra_aead.setkey = crypto_rfc4309_setkey;
814 inst->alg.cra_aead.setauthsize = crypto_rfc4309_setauthsize;
815 inst->alg.cra_aead.encrypt = crypto_rfc4309_encrypt;
816 inst->alg.cra_aead.decrypt = crypto_rfc4309_decrypt;
817
818 inst->alg.cra_aead.geniv = "seqiv";
819
820out:
821 return inst;
822
823out_drop_alg:
824 crypto_drop_aead(spawn);
825out_free_inst:
826 kfree(inst);
827 inst = ERR_PTR(err);
828 goto out;
829}
830
831static void crypto_rfc4309_free(struct crypto_instance *inst)
832{
833 crypto_drop_spawn(crypto_instance_ctx(inst));
834 kfree(inst);
835}
836
837static struct crypto_template crypto_rfc4309_tmpl = {
838 .name = "rfc4309",
839 .alloc = crypto_rfc4309_alloc,
840 .free = crypto_rfc4309_free,
841 .module = THIS_MODULE,
842};
843
844static int __init crypto_ccm_module_init(void)
845{
846 int err;
847
848 err = crypto_register_template(&crypto_ccm_base_tmpl);
849 if (err)
850 goto out;
851
852 err = crypto_register_template(&crypto_ccm_tmpl);
853 if (err)
854 goto out_undo_base;
855
856 err = crypto_register_template(&crypto_rfc4309_tmpl);
857 if (err)
858 goto out_undo_ccm;
859
860out:
861 return err;
862
863out_undo_ccm:
864 crypto_unregister_template(&crypto_ccm_tmpl);
865out_undo_base:
866 crypto_unregister_template(&crypto_ccm_base_tmpl);
867 goto out;
868}
869
870static void __exit crypto_ccm_module_exit(void)
871{
872 crypto_unregister_template(&crypto_rfc4309_tmpl);
873 crypto_unregister_template(&crypto_ccm_tmpl);
874 crypto_unregister_template(&crypto_ccm_base_tmpl);
875}
876
877module_init(crypto_ccm_module_init);
878module_exit(crypto_ccm_module_exit);
879
880MODULE_LICENSE("GPL");
881MODULE_DESCRIPTION("Counter with CBC MAC");
882MODULE_ALIAS("ccm_base");
883MODULE_ALIAS("rfc4309");
884
