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11#include <crypto/gf128mul.h>
12#include <crypto/internal/aead.h>
13#include <crypto/internal/skcipher.h>
14#include <crypto/internal/hash.h>
15#include <crypto/scatterwalk.h>
16#include <crypto/hash.h>
17#include "internal.h"
18#include <linux/completion.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24
25struct gcm_instance_ctx {
26 struct crypto_skcipher_spawn ctr;
27 struct crypto_ahash_spawn ghash;
28};
29
30struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
32 struct crypto_ahash *ghash;
33};
34
35struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
37 u8 nonce[4];
38};
39
40struct crypto_rfc4543_instance_ctx {
41 struct crypto_aead_spawn aead;
42 struct crypto_skcipher_spawn null;
43};
44
45struct crypto_rfc4543_ctx {
46 struct crypto_aead *child;
47 struct crypto_blkcipher *null;
48 u8 nonce[4];
49};
50
51struct crypto_rfc4543_req_ctx {
52 u8 auth_tag[16];
53 u8 assocbuf[32];
54 struct scatterlist cipher[1];
55 struct scatterlist payload[2];
56 struct scatterlist assoc[2];
57 struct aead_request subreq;
58};
59
60struct crypto_gcm_ghash_ctx {
61 unsigned int cryptlen;
62 struct scatterlist *src;
63 void (*complete)(struct aead_request *req, int err);
64};
65
66struct crypto_gcm_req_priv_ctx {
67 u8 auth_tag[16];
68 u8 iauth_tag[16];
69 struct scatterlist src[2];
70 struct scatterlist dst[2];
71 struct crypto_gcm_ghash_ctx ghash_ctx;
72 union {
73 struct ahash_request ahreq;
74 struct ablkcipher_request abreq;
75 } u;
76};
77
78struct crypto_gcm_setkey_result {
79 int err;
80 struct completion completion;
81};
82
83static void *gcm_zeroes;
84
85static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86 struct aead_request *req)
87{
88 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89
90 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
91}
92
93static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
94{
95 struct crypto_gcm_setkey_result *result = req->data;
96
97 if (err == -EINPROGRESS)
98 return;
99
100 result->err = err;
101 complete(&result->completion);
102}
103
104static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
105 unsigned int keylen)
106{
107 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
108 struct crypto_ahash *ghash = ctx->ghash;
109 struct crypto_ablkcipher *ctr = ctx->ctr;
110 struct {
111 be128 hash;
112 u8 iv[8];
113
114 struct crypto_gcm_setkey_result result;
115
116 struct scatterlist sg[1];
117 struct ablkcipher_request req;
118 } *data;
119 int err;
120
121 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
122 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
123 CRYPTO_TFM_REQ_MASK);
124
125 err = crypto_ablkcipher_setkey(ctr, key, keylen);
126 if (err)
127 return err;
128
129 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
130 CRYPTO_TFM_RES_MASK);
131
132 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
133 GFP_KERNEL);
134 if (!data)
135 return -ENOMEM;
136
137 init_completion(&data->result.completion);
138 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
139 ablkcipher_request_set_tfm(&data->req, ctr);
140 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
141 CRYPTO_TFM_REQ_MAY_BACKLOG,
142 crypto_gcm_setkey_done,
143 &data->result);
144 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
145 sizeof(data->hash), data->iv);
146
147 err = crypto_ablkcipher_encrypt(&data->req);
148 if (err == -EINPROGRESS || err == -EBUSY) {
149 err = wait_for_completion_interruptible(
150 &data->result.completion);
151 if (!err)
152 err = data->result.err;
153 }
154
155 if (err)
156 goto out;
157
158 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
159 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
160 CRYPTO_TFM_REQ_MASK);
161 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
162 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
163 CRYPTO_TFM_RES_MASK);
164
165out:
166 kfree(data);
167 return err;
168}
169
170static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
171 unsigned int authsize)
172{
173 switch (authsize) {
174 case 4:
175 case 8:
176 case 12:
177 case 13:
178 case 14:
179 case 15:
180 case 16:
181 break;
182 default:
183 return -EINVAL;
184 }
185
186 return 0;
187}
188
189static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
190 struct aead_request *req,
191 unsigned int cryptlen)
192{
193 struct crypto_aead *aead = crypto_aead_reqtfm(req);
194 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
195 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
196 struct scatterlist *dst;
197 __be32 counter = cpu_to_be32(1);
198
199 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200 memcpy(req->iv + 12, &counter, 4);
201
202 sg_init_table(pctx->src, 2);
203 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
204 scatterwalk_sg_chain(pctx->src, 2, req->src);
205
206 dst = pctx->src;
207 if (req->src != req->dst) {
208 sg_init_table(pctx->dst, 2);
209 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
210 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
211 dst = pctx->dst;
212 }
213
214 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
215 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
216 cryptlen + sizeof(pctx->auth_tag),
217 req->iv);
218}
219
220static inline unsigned int gcm_remain(unsigned int len)
221{
222 len &= 0xfU;
223 return len ? 16 - len : 0;
224}
225
226static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
227static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
228
229static int gcm_hash_update(struct aead_request *req,
230 struct crypto_gcm_req_priv_ctx *pctx,
231 crypto_completion_t compl,
232 struct scatterlist *src,
233 unsigned int len)
234{
235 struct ahash_request *ahreq = &pctx->u.ahreq;
236
237 ahash_request_set_callback(ahreq, aead_request_flags(req),
238 compl, req);
239 ahash_request_set_crypt(ahreq, src, NULL, len);
240
241 return crypto_ahash_update(ahreq);
242}
243
244static int gcm_hash_remain(struct aead_request *req,
245 struct crypto_gcm_req_priv_ctx *pctx,
246 unsigned int remain,
247 crypto_completion_t compl)
248{
249 struct ahash_request *ahreq = &pctx->u.ahreq;
250
251 ahash_request_set_callback(ahreq, aead_request_flags(req),
252 compl, req);
253 sg_init_one(pctx->src, gcm_zeroes, remain);
254 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
255
256 return crypto_ahash_update(ahreq);
257}
258
259static int gcm_hash_len(struct aead_request *req,
260 struct crypto_gcm_req_priv_ctx *pctx)
261{
262 struct ahash_request *ahreq = &pctx->u.ahreq;
263 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
264 u128 lengths;
265
266 lengths.a = cpu_to_be64(req->assoclen * 8);
267 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
268 memcpy(pctx->iauth_tag, &lengths, 16);
269 sg_init_one(pctx->src, pctx->iauth_tag, 16);
270 ahash_request_set_callback(ahreq, aead_request_flags(req),
271 gcm_hash_len_done, req);
272 ahash_request_set_crypt(ahreq, pctx->src,
273 NULL, sizeof(lengths));
274
275 return crypto_ahash_update(ahreq);
276}
277
278static int gcm_hash_final(struct aead_request *req,
279 struct crypto_gcm_req_priv_ctx *pctx)
280{
281 struct ahash_request *ahreq = &pctx->u.ahreq;
282
283 ahash_request_set_callback(ahreq, aead_request_flags(req),
284 gcm_hash_final_done, req);
285 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
286
287 return crypto_ahash_final(ahreq);
288}
289
290static void __gcm_hash_final_done(struct aead_request *req, int err)
291{
292 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
293 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
294
295 if (!err)
296 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
297
298 gctx->complete(req, err);
299}
300
301static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
302{
303 struct aead_request *req = areq->data;
304
305 __gcm_hash_final_done(req, err);
306}
307
308static void __gcm_hash_len_done(struct aead_request *req, int err)
309{
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311
312 if (!err) {
313 err = gcm_hash_final(req, pctx);
314 if (err == -EINPROGRESS || err == -EBUSY)
315 return;
316 }
317
318 __gcm_hash_final_done(req, err);
319}
320
321static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
322{
323 struct aead_request *req = areq->data;
324
325 __gcm_hash_len_done(req, err);
326}
327
328static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
329{
330 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
331
332 if (!err) {
333 err = gcm_hash_len(req, pctx);
334 if (err == -EINPROGRESS || err == -EBUSY)
335 return;
336 }
337
338 __gcm_hash_len_done(req, err);
339}
340
341static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
342 int err)
343{
344 struct aead_request *req = areq->data;
345
346 __gcm_hash_crypt_remain_done(req, err);
347}
348
349static void __gcm_hash_crypt_done(struct aead_request *req, int err)
350{
351 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
352 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
353 unsigned int remain;
354
355 if (!err) {
356 remain = gcm_remain(gctx->cryptlen);
357 BUG_ON(!remain);
358 err = gcm_hash_remain(req, pctx, remain,
359 gcm_hash_crypt_remain_done);
360 if (err == -EINPROGRESS || err == -EBUSY)
361 return;
362 }
363
364 __gcm_hash_crypt_remain_done(req, err);
365}
366
367static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
368{
369 struct aead_request *req = areq->data;
370
371 __gcm_hash_crypt_done(req, err);
372}
373
374static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
375{
376 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
377 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
378 crypto_completion_t compl;
379 unsigned int remain = 0;
380
381 if (!err && gctx->cryptlen) {
382 remain = gcm_remain(gctx->cryptlen);
383 compl = remain ? gcm_hash_crypt_done :
384 gcm_hash_crypt_remain_done;
385 err = gcm_hash_update(req, pctx, compl,
386 gctx->src, gctx->cryptlen);
387 if (err == -EINPROGRESS || err == -EBUSY)
388 return;
389 }
390
391 if (remain)
392 __gcm_hash_crypt_done(req, err);
393 else
394 __gcm_hash_crypt_remain_done(req, err);
395}
396
397static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
398 int err)
399{
400 struct aead_request *req = areq->data;
401
402 __gcm_hash_assoc_remain_done(req, err);
403}
404
405static void __gcm_hash_assoc_done(struct aead_request *req, int err)
406{
407 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
408 unsigned int remain;
409
410 if (!err) {
411 remain = gcm_remain(req->assoclen);
412 BUG_ON(!remain);
413 err = gcm_hash_remain(req, pctx, remain,
414 gcm_hash_assoc_remain_done);
415 if (err == -EINPROGRESS || err == -EBUSY)
416 return;
417 }
418
419 __gcm_hash_assoc_remain_done(req, err);
420}
421
422static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
423{
424 struct aead_request *req = areq->data;
425
426 __gcm_hash_assoc_done(req, err);
427}
428
429static void __gcm_hash_init_done(struct aead_request *req, int err)
430{
431 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
432 crypto_completion_t compl;
433 unsigned int remain = 0;
434
435 if (!err && req->assoclen) {
436 remain = gcm_remain(req->assoclen);
437 compl = remain ? gcm_hash_assoc_done :
438 gcm_hash_assoc_remain_done;
439 err = gcm_hash_update(req, pctx, compl,
440 req->assoc, req->assoclen);
441 if (err == -EINPROGRESS || err == -EBUSY)
442 return;
443 }
444
445 if (remain)
446 __gcm_hash_assoc_done(req, err);
447 else
448 __gcm_hash_assoc_remain_done(req, err);
449}
450
451static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
452{
453 struct aead_request *req = areq->data;
454
455 __gcm_hash_init_done(req, err);
456}
457
458static int gcm_hash(struct aead_request *req,
459 struct crypto_gcm_req_priv_ctx *pctx)
460{
461 struct ahash_request *ahreq = &pctx->u.ahreq;
462 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
463 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
464 unsigned int remain;
465 crypto_completion_t compl;
466 int err;
467
468 ahash_request_set_tfm(ahreq, ctx->ghash);
469
470 ahash_request_set_callback(ahreq, aead_request_flags(req),
471 gcm_hash_init_done, req);
472 err = crypto_ahash_init(ahreq);
473 if (err)
474 return err;
475 remain = gcm_remain(req->assoclen);
476 compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
477 err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
478 if (err)
479 return err;
480 if (remain) {
481 err = gcm_hash_remain(req, pctx, remain,
482 gcm_hash_assoc_remain_done);
483 if (err)
484 return err;
485 }
486 remain = gcm_remain(gctx->cryptlen);
487 compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
488 err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
489 if (err)
490 return err;
491 if (remain) {
492 err = gcm_hash_remain(req, pctx, remain,
493 gcm_hash_crypt_remain_done);
494 if (err)
495 return err;
496 }
497 err = gcm_hash_len(req, pctx);
498 if (err)
499 return err;
500 err = gcm_hash_final(req, pctx);
501 if (err)
502 return err;
503
504 return 0;
505}
506
507static void gcm_enc_copy_hash(struct aead_request *req,
508 struct crypto_gcm_req_priv_ctx *pctx)
509{
510 struct crypto_aead *aead = crypto_aead_reqtfm(req);
511 u8 *auth_tag = pctx->auth_tag;
512
513 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
514 crypto_aead_authsize(aead), 1);
515}
516
517static void gcm_enc_hash_done(struct aead_request *req, int err)
518{
519 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
520
521 if (!err)
522 gcm_enc_copy_hash(req, pctx);
523
524 aead_request_complete(req, err);
525}
526
527static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
528{
529 struct aead_request *req = areq->data;
530 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
531
532 if (!err) {
533 err = gcm_hash(req, pctx);
534 if (err == -EINPROGRESS || err == -EBUSY)
535 return;
536 else if (!err) {
537 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
538 gcm_enc_copy_hash(req, pctx);
539 }
540 }
541
542 aead_request_complete(req, err);
543}
544
545static int crypto_gcm_encrypt(struct aead_request *req)
546{
547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
548 struct ablkcipher_request *abreq = &pctx->u.abreq;
549 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
550 int err;
551
552 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
553 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
554 gcm_encrypt_done, req);
555
556 gctx->src = req->dst;
557 gctx->cryptlen = req->cryptlen;
558 gctx->complete = gcm_enc_hash_done;
559
560 err = crypto_ablkcipher_encrypt(abreq);
561 if (err)
562 return err;
563
564 err = gcm_hash(req, pctx);
565 if (err)
566 return err;
567
568 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
569 gcm_enc_copy_hash(req, pctx);
570
571 return 0;
572}
573
574static int crypto_gcm_verify(struct aead_request *req,
575 struct crypto_gcm_req_priv_ctx *pctx)
576{
577 struct crypto_aead *aead = crypto_aead_reqtfm(req);
578 u8 *auth_tag = pctx->auth_tag;
579 u8 *iauth_tag = pctx->iauth_tag;
580 unsigned int authsize = crypto_aead_authsize(aead);
581 unsigned int cryptlen = req->cryptlen - authsize;
582
583 crypto_xor(auth_tag, iauth_tag, 16);
584 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
585 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
586}
587
588static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
589{
590 struct aead_request *req = areq->data;
591 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
592
593 if (!err)
594 err = crypto_gcm_verify(req, pctx);
595
596 aead_request_complete(req, err);
597}
598
599static void gcm_dec_hash_done(struct aead_request *req, int err)
600{
601 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
602 struct ablkcipher_request *abreq = &pctx->u.abreq;
603 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
604
605 if (!err) {
606 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
607 gcm_decrypt_done, req);
608 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
609 err = crypto_ablkcipher_decrypt(abreq);
610 if (err == -EINPROGRESS || err == -EBUSY)
611 return;
612 else if (!err)
613 err = crypto_gcm_verify(req, pctx);
614 }
615
616 aead_request_complete(req, err);
617}
618
619static int crypto_gcm_decrypt(struct aead_request *req)
620{
621 struct crypto_aead *aead = crypto_aead_reqtfm(req);
622 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
623 struct ablkcipher_request *abreq = &pctx->u.abreq;
624 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
625 unsigned int authsize = crypto_aead_authsize(aead);
626 unsigned int cryptlen = req->cryptlen;
627 int err;
628
629 if (cryptlen < authsize)
630 return -EINVAL;
631 cryptlen -= authsize;
632
633 gctx->src = req->src;
634 gctx->cryptlen = cryptlen;
635 gctx->complete = gcm_dec_hash_done;
636
637 err = gcm_hash(req, pctx);
638 if (err)
639 return err;
640
641 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
642 gcm_decrypt_done, req);
643 crypto_gcm_init_crypt(abreq, req, cryptlen);
644 err = crypto_ablkcipher_decrypt(abreq);
645 if (err)
646 return err;
647
648 return crypto_gcm_verify(req, pctx);
649}
650
651static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
652{
653 struct crypto_instance *inst = (void *)tfm->__crt_alg;
654 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
655 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
656 struct crypto_ablkcipher *ctr;
657 struct crypto_ahash *ghash;
658 unsigned long align;
659 int err;
660
661 ghash = crypto_spawn_ahash(&ictx->ghash);
662 if (IS_ERR(ghash))
663 return PTR_ERR(ghash);
664
665 ctr = crypto_spawn_skcipher(&ictx->ctr);
666 err = PTR_ERR(ctr);
667 if (IS_ERR(ctr))
668 goto err_free_hash;
669
670 ctx->ctr = ctr;
671 ctx->ghash = ghash;
672
673 align = crypto_tfm_alg_alignmask(tfm);
674 align &= ~(crypto_tfm_ctx_alignment() - 1);
675 tfm->crt_aead.reqsize = align +
676 offsetof(struct crypto_gcm_req_priv_ctx, u) +
677 max(sizeof(struct ablkcipher_request) +
678 crypto_ablkcipher_reqsize(ctr),
679 sizeof(struct ahash_request) +
680 crypto_ahash_reqsize(ghash));
681
682 return 0;
683
684err_free_hash:
685 crypto_free_ahash(ghash);
686 return err;
687}
688
689static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
690{
691 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
692
693 crypto_free_ahash(ctx->ghash);
694 crypto_free_ablkcipher(ctx->ctr);
695}
696
697static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
698 const char *full_name,
699 const char *ctr_name,
700 const char *ghash_name)
701{
702 struct crypto_attr_type *algt;
703 struct crypto_instance *inst;
704 struct crypto_alg *ctr;
705 struct crypto_alg *ghash_alg;
706 struct ahash_alg *ghash_ahash_alg;
707 struct gcm_instance_ctx *ctx;
708 int err;
709
710 algt = crypto_get_attr_type(tb);
711 if (IS_ERR(algt))
712 return ERR_CAST(algt);
713
714 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
715 return ERR_PTR(-EINVAL);
716
717 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
718 CRYPTO_ALG_TYPE_HASH,
719 CRYPTO_ALG_TYPE_AHASH_MASK);
720 if (IS_ERR(ghash_alg))
721 return ERR_CAST(ghash_alg);
722
723 err = -ENOMEM;
724 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
725 if (!inst)
726 goto out_put_ghash;
727
728 ctx = crypto_instance_ctx(inst);
729 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
730 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
731 inst);
732 if (err)
733 goto err_free_inst;
734
735 crypto_set_skcipher_spawn(&ctx->ctr, inst);
736 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
737 crypto_requires_sync(algt->type,
738 algt->mask));
739 if (err)
740 goto err_drop_ghash;
741
742 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
743
744
745 if (ctr->cra_ablkcipher.ivsize != 16)
746 goto out_put_ctr;
747
748
749 err = -EINVAL;
750 if (ctr->cra_blocksize != 1)
751 goto out_put_ctr;
752
753 err = -ENAMETOOLONG;
754 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
755 "gcm_base(%s,%s)", ctr->cra_driver_name,
756 ghash_alg->cra_driver_name) >=
757 CRYPTO_MAX_ALG_NAME)
758 goto out_put_ctr;
759
760 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
761
762 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
763 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
764 inst->alg.cra_priority = ctr->cra_priority;
765 inst->alg.cra_blocksize = 1;
766 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
767 inst->alg.cra_type = &crypto_aead_type;
768 inst->alg.cra_aead.ivsize = 16;
769 inst->alg.cra_aead.maxauthsize = 16;
770 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
771 inst->alg.cra_init = crypto_gcm_init_tfm;
772 inst->alg.cra_exit = crypto_gcm_exit_tfm;
773 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
774 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
775 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
776 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
777
778out:
779 crypto_mod_put(ghash_alg);
780 return inst;
781
782out_put_ctr:
783 crypto_drop_skcipher(&ctx->ctr);
784err_drop_ghash:
785 crypto_drop_ahash(&ctx->ghash);
786err_free_inst:
787 kfree(inst);
788out_put_ghash:
789 inst = ERR_PTR(err);
790 goto out;
791}
792
793static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
794{
795 const char *cipher_name;
796 char ctr_name[CRYPTO_MAX_ALG_NAME];
797 char full_name[CRYPTO_MAX_ALG_NAME];
798
799 cipher_name = crypto_attr_alg_name(tb[1]);
800 if (IS_ERR(cipher_name))
801 return ERR_CAST(cipher_name);
802
803 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
804 CRYPTO_MAX_ALG_NAME)
805 return ERR_PTR(-ENAMETOOLONG);
806
807 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
808 CRYPTO_MAX_ALG_NAME)
809 return ERR_PTR(-ENAMETOOLONG);
810
811 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
812}
813
814static void crypto_gcm_free(struct crypto_instance *inst)
815{
816 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
817
818 crypto_drop_skcipher(&ctx->ctr);
819 crypto_drop_ahash(&ctx->ghash);
820 kfree(inst);
821}
822
823static struct crypto_template crypto_gcm_tmpl = {
824 .name = "gcm",
825 .alloc = crypto_gcm_alloc,
826 .free = crypto_gcm_free,
827 .module = THIS_MODULE,
828};
829
830static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
831{
832 const char *ctr_name;
833 const char *ghash_name;
834 char full_name[CRYPTO_MAX_ALG_NAME];
835
836 ctr_name = crypto_attr_alg_name(tb[1]);
837 if (IS_ERR(ctr_name))
838 return ERR_CAST(ctr_name);
839
840 ghash_name = crypto_attr_alg_name(tb[2]);
841 if (IS_ERR(ghash_name))
842 return ERR_CAST(ghash_name);
843
844 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
846 return ERR_PTR(-ENAMETOOLONG);
847
848 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
849}
850
851static struct crypto_template crypto_gcm_base_tmpl = {
852 .name = "gcm_base",
853 .alloc = crypto_gcm_base_alloc,
854 .free = crypto_gcm_free,
855 .module = THIS_MODULE,
856};
857
858static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
859 unsigned int keylen)
860{
861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862 struct crypto_aead *child = ctx->child;
863 int err;
864
865 if (keylen < 4)
866 return -EINVAL;
867
868 keylen -= 4;
869 memcpy(ctx->nonce, key + keylen, 4);
870
871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873 CRYPTO_TFM_REQ_MASK);
874 err = crypto_aead_setkey(child, key, keylen);
875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876 CRYPTO_TFM_RES_MASK);
877
878 return err;
879}
880
881static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882 unsigned int authsize)
883{
884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
885
886 switch (authsize) {
887 case 8:
888 case 12:
889 case 16:
890 break;
891 default:
892 return -EINVAL;
893 }
894
895 return crypto_aead_setauthsize(ctx->child, authsize);
896}
897
898static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
899{
900 struct aead_request *subreq = aead_request_ctx(req);
901 struct crypto_aead *aead = crypto_aead_reqtfm(req);
902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903 struct crypto_aead *child = ctx->child;
904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905 crypto_aead_alignmask(child) + 1);
906
907 memcpy(iv, ctx->nonce, 4);
908 memcpy(iv + 4, req->iv, 8);
909
910 aead_request_set_tfm(subreq, child);
911 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
912 req->base.data);
913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
915
916 return subreq;
917}
918
919static int crypto_rfc4106_encrypt(struct aead_request *req)
920{
921 req = crypto_rfc4106_crypt(req);
922
923 return crypto_aead_encrypt(req);
924}
925
926static int crypto_rfc4106_decrypt(struct aead_request *req)
927{
928 req = crypto_rfc4106_crypt(req);
929
930 return crypto_aead_decrypt(req);
931}
932
933static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
934{
935 struct crypto_instance *inst = (void *)tfm->__crt_alg;
936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938 struct crypto_aead *aead;
939 unsigned long align;
940
941 aead = crypto_spawn_aead(spawn);
942 if (IS_ERR(aead))
943 return PTR_ERR(aead);
944
945 ctx->child = aead;
946
947 align = crypto_aead_alignmask(aead);
948 align &= ~(crypto_tfm_ctx_alignment() - 1);
949 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950 ALIGN(crypto_aead_reqsize(aead),
951 crypto_tfm_ctx_alignment()) +
952 align + 16;
953
954 return 0;
955}
956
957static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
958{
959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
960
961 crypto_free_aead(ctx->child);
962}
963
964static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
965{
966 struct crypto_attr_type *algt;
967 struct crypto_instance *inst;
968 struct crypto_aead_spawn *spawn;
969 struct crypto_alg *alg;
970 const char *ccm_name;
971 int err;
972
973 algt = crypto_get_attr_type(tb);
974 if (IS_ERR(algt))
975 return ERR_CAST(algt);
976
977 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
978 return ERR_PTR(-EINVAL);
979
980 ccm_name = crypto_attr_alg_name(tb[1]);
981 if (IS_ERR(ccm_name))
982 return ERR_CAST(ccm_name);
983
984 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
985 if (!inst)
986 return ERR_PTR(-ENOMEM);
987
988 spawn = crypto_instance_ctx(inst);
989 crypto_set_aead_spawn(spawn, inst);
990 err = crypto_grab_aead(spawn, ccm_name, 0,
991 crypto_requires_sync(algt->type, algt->mask));
992 if (err)
993 goto out_free_inst;
994
995 alg = crypto_aead_spawn_alg(spawn);
996
997 err = -EINVAL;
998
999
1000 if (alg->cra_aead.ivsize != 16)
1001 goto out_drop_alg;
1002
1003
1004 if (alg->cra_blocksize != 1)
1005 goto out_drop_alg;
1006
1007 err = -ENAMETOOLONG;
1008 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1009 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1010 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_driver_name) >=
1012 CRYPTO_MAX_ALG_NAME)
1013 goto out_drop_alg;
1014
1015 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1016 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1017 inst->alg.cra_priority = alg->cra_priority;
1018 inst->alg.cra_blocksize = 1;
1019 inst->alg.cra_alignmask = alg->cra_alignmask;
1020 inst->alg.cra_type = &crypto_nivaead_type;
1021
1022 inst->alg.cra_aead.ivsize = 8;
1023 inst->alg.cra_aead.maxauthsize = 16;
1024
1025 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1026
1027 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1028 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1029
1030 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1031 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1032 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1033 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1034
1035 inst->alg.cra_aead.geniv = "seqiv";
1036
1037out:
1038 return inst;
1039
1040out_drop_alg:
1041 crypto_drop_aead(spawn);
1042out_free_inst:
1043 kfree(inst);
1044 inst = ERR_PTR(err);
1045 goto out;
1046}
1047
1048static void crypto_rfc4106_free(struct crypto_instance *inst)
1049{
1050 crypto_drop_spawn(crypto_instance_ctx(inst));
1051 kfree(inst);
1052}
1053
1054static struct crypto_template crypto_rfc4106_tmpl = {
1055 .name = "rfc4106",
1056 .alloc = crypto_rfc4106_alloc,
1057 .free = crypto_rfc4106_free,
1058 .module = THIS_MODULE,
1059};
1060
1061static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1062 struct aead_request *req)
1063{
1064 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1065
1066 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1067}
1068
1069static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1070 unsigned int keylen)
1071{
1072 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1073 struct crypto_aead *child = ctx->child;
1074 int err;
1075
1076 if (keylen < 4)
1077 return -EINVAL;
1078
1079 keylen -= 4;
1080 memcpy(ctx->nonce, key + keylen, 4);
1081
1082 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1083 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1084 CRYPTO_TFM_REQ_MASK);
1085 err = crypto_aead_setkey(child, key, keylen);
1086 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1087 CRYPTO_TFM_RES_MASK);
1088
1089 return err;
1090}
1091
1092static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1093 unsigned int authsize)
1094{
1095 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1096
1097 if (authsize != 16)
1098 return -EINVAL;
1099
1100 return crypto_aead_setauthsize(ctx->child, authsize);
1101}
1102
1103static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1104{
1105 struct aead_request *req = areq->data;
1106 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1107 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1108
1109 if (!err) {
1110 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1111 req->cryptlen,
1112 crypto_aead_authsize(aead), 1);
1113 }
1114
1115 aead_request_complete(req, err);
1116}
1117
1118static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1119 bool enc)
1120{
1121 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1122 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1123 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1124 struct aead_request *subreq = &rctx->subreq;
1125 struct scatterlist *src = req->src;
1126 struct scatterlist *cipher = rctx->cipher;
1127 struct scatterlist *payload = rctx->payload;
1128 struct scatterlist *assoc = rctx->assoc;
1129 unsigned int authsize = crypto_aead_authsize(aead);
1130 unsigned int assoclen = req->assoclen;
1131 struct page *srcp;
1132 u8 *vsrc;
1133 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1134 crypto_aead_alignmask(ctx->child) + 1);
1135
1136 memcpy(iv, ctx->nonce, 4);
1137 memcpy(iv + 4, req->iv, 8);
1138
1139
1140 if (enc)
1141 memset(rctx->auth_tag, 0, authsize);
1142 else
1143 scatterwalk_map_and_copy(rctx->auth_tag, src,
1144 req->cryptlen - authsize,
1145 authsize, 0);
1146
1147 sg_init_one(cipher, rctx->auth_tag, authsize);
1148
1149
1150 srcp = sg_page(src);
1151 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
1152
1153 sg_init_table(payload, 2);
1154 sg_set_buf(payload, req->iv, 8);
1155 scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
1156 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1157
1158 if (req->assoc->length == req->assoclen) {
1159 sg_init_table(assoc, 2);
1160 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1161 req->assoc->offset);
1162 } else {
1163 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1164
1165 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1166 req->assoclen, 0);
1167
1168 sg_init_table(assoc, 2);
1169 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1170 }
1171 scatterwalk_crypto_chain(assoc, payload, 0, 2);
1172
1173 aead_request_set_tfm(subreq, ctx->child);
1174 aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1175 req);
1176 if (!enc)
1177 aead_request_set_callback(subreq, req->base.flags,
1178 req->base.complete, req->base.data);
1179 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1180 aead_request_set_assoc(subreq, assoc, assoclen);
1181
1182 return subreq;
1183}
1184
1185static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1186{
1187 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1188 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1189 unsigned int authsize = crypto_aead_authsize(aead);
1190 unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1191 struct blkcipher_desc desc = {
1192 .tfm = ctx->null,
1193 };
1194
1195 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1196}
1197
1198static int crypto_rfc4543_encrypt(struct aead_request *req)
1199{
1200 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1201 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1202 struct aead_request *subreq;
1203 int err;
1204
1205 if (req->src != req->dst) {
1206 err = crypto_rfc4543_copy_src_to_dst(req, true);
1207 if (err)
1208 return err;
1209 }
1210
1211 subreq = crypto_rfc4543_crypt(req, true);
1212 err = crypto_aead_encrypt(subreq);
1213 if (err)
1214 return err;
1215
1216 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1217 crypto_aead_authsize(aead), 1);
1218
1219 return 0;
1220}
1221
1222static int crypto_rfc4543_decrypt(struct aead_request *req)
1223{
1224 int err;
1225
1226 if (req->src != req->dst) {
1227 err = crypto_rfc4543_copy_src_to_dst(req, false);
1228 if (err)
1229 return err;
1230 }
1231
1232 req = crypto_rfc4543_crypt(req, false);
1233
1234 return crypto_aead_decrypt(req);
1235}
1236
1237static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1238{
1239 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1240 struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1241 struct crypto_aead_spawn *spawn = &ictx->aead;
1242 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1243 struct crypto_aead *aead;
1244 struct crypto_blkcipher *null;
1245 unsigned long align;
1246 int err = 0;
1247
1248 aead = crypto_spawn_aead(spawn);
1249 if (IS_ERR(aead))
1250 return PTR_ERR(aead);
1251
1252 null = crypto_spawn_blkcipher(&ictx->null.base);
1253 err = PTR_ERR(null);
1254 if (IS_ERR(null))
1255 goto err_free_aead;
1256
1257 ctx->child = aead;
1258 ctx->null = null;
1259
1260 align = crypto_aead_alignmask(aead);
1261 align &= ~(crypto_tfm_ctx_alignment() - 1);
1262 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1263 ALIGN(crypto_aead_reqsize(aead),
1264 crypto_tfm_ctx_alignment()) +
1265 align + 16;
1266
1267 return 0;
1268
1269err_free_aead:
1270 crypto_free_aead(aead);
1271 return err;
1272}
1273
1274static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1275{
1276 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1277
1278 crypto_free_aead(ctx->child);
1279 crypto_free_blkcipher(ctx->null);
1280}
1281
1282static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1283{
1284 struct crypto_attr_type *algt;
1285 struct crypto_instance *inst;
1286 struct crypto_aead_spawn *spawn;
1287 struct crypto_alg *alg;
1288 struct crypto_rfc4543_instance_ctx *ctx;
1289 const char *ccm_name;
1290 int err;
1291
1292 algt = crypto_get_attr_type(tb);
1293 if (IS_ERR(algt))
1294 return ERR_CAST(algt);
1295
1296 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1297 return ERR_PTR(-EINVAL);
1298
1299 ccm_name = crypto_attr_alg_name(tb[1]);
1300 if (IS_ERR(ccm_name))
1301 return ERR_CAST(ccm_name);
1302
1303 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1304 if (!inst)
1305 return ERR_PTR(-ENOMEM);
1306
1307 ctx = crypto_instance_ctx(inst);
1308 spawn = &ctx->aead;
1309 crypto_set_aead_spawn(spawn, inst);
1310 err = crypto_grab_aead(spawn, ccm_name, 0,
1311 crypto_requires_sync(algt->type, algt->mask));
1312 if (err)
1313 goto out_free_inst;
1314
1315 alg = crypto_aead_spawn_alg(spawn);
1316
1317 crypto_set_skcipher_spawn(&ctx->null, inst);
1318 err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1319 CRYPTO_ALG_ASYNC);
1320 if (err)
1321 goto out_drop_alg;
1322
1323 crypto_skcipher_spawn_alg(&ctx->null);
1324
1325 err = -EINVAL;
1326
1327
1328 if (alg->cra_aead.ivsize != 16)
1329 goto out_drop_ecbnull;
1330
1331
1332 if (alg->cra_blocksize != 1)
1333 goto out_drop_ecbnull;
1334
1335 err = -ENAMETOOLONG;
1336 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1337 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1338 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1339 "rfc4543(%s)", alg->cra_driver_name) >=
1340 CRYPTO_MAX_ALG_NAME)
1341 goto out_drop_ecbnull;
1342
1343 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1344 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1345 inst->alg.cra_priority = alg->cra_priority;
1346 inst->alg.cra_blocksize = 1;
1347 inst->alg.cra_alignmask = alg->cra_alignmask;
1348 inst->alg.cra_type = &crypto_nivaead_type;
1349
1350 inst->alg.cra_aead.ivsize = 8;
1351 inst->alg.cra_aead.maxauthsize = 16;
1352
1353 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1354
1355 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1356 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1357
1358 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1359 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1360 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1361 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1362
1363 inst->alg.cra_aead.geniv = "seqiv";
1364
1365out:
1366 return inst;
1367
1368out_drop_ecbnull:
1369 crypto_drop_skcipher(&ctx->null);
1370out_drop_alg:
1371 crypto_drop_aead(spawn);
1372out_free_inst:
1373 kfree(inst);
1374 inst = ERR_PTR(err);
1375 goto out;
1376}
1377
1378static void crypto_rfc4543_free(struct crypto_instance *inst)
1379{
1380 struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1381
1382 crypto_drop_aead(&ctx->aead);
1383 crypto_drop_skcipher(&ctx->null);
1384
1385 kfree(inst);
1386}
1387
1388static struct crypto_template crypto_rfc4543_tmpl = {
1389 .name = "rfc4543",
1390 .alloc = crypto_rfc4543_alloc,
1391 .free = crypto_rfc4543_free,
1392 .module = THIS_MODULE,
1393};
1394
1395static int __init crypto_gcm_module_init(void)
1396{
1397 int err;
1398
1399 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1400 if (!gcm_zeroes)
1401 return -ENOMEM;
1402
1403 err = crypto_register_template(&crypto_gcm_base_tmpl);
1404 if (err)
1405 goto out;
1406
1407 err = crypto_register_template(&crypto_gcm_tmpl);
1408 if (err)
1409 goto out_undo_base;
1410
1411 err = crypto_register_template(&crypto_rfc4106_tmpl);
1412 if (err)
1413 goto out_undo_gcm;
1414
1415 err = crypto_register_template(&crypto_rfc4543_tmpl);
1416 if (err)
1417 goto out_undo_rfc4106;
1418
1419 return 0;
1420
1421out_undo_rfc4106:
1422 crypto_unregister_template(&crypto_rfc4106_tmpl);
1423out_undo_gcm:
1424 crypto_unregister_template(&crypto_gcm_tmpl);
1425out_undo_base:
1426 crypto_unregister_template(&crypto_gcm_base_tmpl);
1427out:
1428 kfree(gcm_zeroes);
1429 return err;
1430}
1431
1432static void __exit crypto_gcm_module_exit(void)
1433{
1434 kfree(gcm_zeroes);
1435 crypto_unregister_template(&crypto_rfc4543_tmpl);
1436 crypto_unregister_template(&crypto_rfc4106_tmpl);
1437 crypto_unregister_template(&crypto_gcm_tmpl);
1438 crypto_unregister_template(&crypto_gcm_base_tmpl);
1439}
1440
1441module_init(crypto_gcm_module_init);
1442module_exit(crypto_gcm_module_exit);
1443
1444MODULE_LICENSE("GPL");
1445MODULE_DESCRIPTION("Galois/Counter Mode");
1446MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1447MODULE_ALIAS_CRYPTO("gcm_base");
1448MODULE_ALIAS_CRYPTO("rfc4106");
1449MODULE_ALIAS_CRYPTO("rfc4543");
1450MODULE_ALIAS_CRYPTO("gcm");
1451
