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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GCM: Galois/Counter Mode.
4 *
5 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
6 */
7
8#include <crypto/gf128mul.h>
9#include <crypto/internal/aead.h>
10#include <crypto/internal/skcipher.h>
11#include <crypto/internal/hash.h>
12#include <crypto/null.h>
13#include <crypto/scatterwalk.h>
14#include <crypto/gcm.h>
15#include <crypto/hash.h>
16#include "internal.h"
17#include <linux/err.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22
23struct gcm_instance_ctx {
24 struct crypto_skcipher_spawn ctr;
25 struct crypto_ahash_spawn ghash;
26};
27
28struct crypto_gcm_ctx {
29 struct crypto_skcipher *ctr;
30 struct crypto_ahash *ghash;
31};
32
33struct crypto_rfc4106_ctx {
34 struct crypto_aead *child;
35 u8 nonce[4];
36};
37
38struct crypto_rfc4106_req_ctx {
39 struct scatterlist src[3];
40 struct scatterlist dst[3];
41 struct aead_request subreq;
42};
43
44struct crypto_rfc4543_instance_ctx {
45 struct crypto_aead_spawn aead;
46};
47
48struct crypto_rfc4543_ctx {
49 struct crypto_aead *child;
50 struct crypto_sync_skcipher *null;
51 u8 nonce[4];
52};
53
54struct crypto_rfc4543_req_ctx {
55 struct aead_request subreq;
56};
57
58struct crypto_gcm_ghash_ctx {
59 unsigned int cryptlen;
60 struct scatterlist *src;
61 int (*complete)(struct aead_request *req, u32 flags);
62};
63
64struct crypto_gcm_req_priv_ctx {
65 u8 iv[16];
66 u8 auth_tag[16];
67 u8 iauth_tag[16];
68 struct scatterlist src[3];
69 struct scatterlist dst[3];
70 struct scatterlist sg;
71 struct crypto_gcm_ghash_ctx ghash_ctx;
72 union {
73 struct ahash_request ahreq;
74 struct skcipher_request skreq;
75 } u;
76};
77
78static struct {
79 u8 buf[16];
80 struct scatterlist sg;
81} *gcm_zeroes;
82
83static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
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 int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
94 unsigned int keylen)
95{
96 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
97 struct crypto_ahash *ghash = ctx->ghash;
98 struct crypto_skcipher *ctr = ctx->ctr;
99 struct {
100 be128 hash;
101 u8 iv[16];
102
103 struct crypto_wait wait;
104
105 struct scatterlist sg[1];
106 struct skcipher_request req;
107 } *data;
108 int err;
109
110 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
111 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
112 CRYPTO_TFM_REQ_MASK);
113 err = crypto_skcipher_setkey(ctr, key, keylen);
114 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
115 CRYPTO_TFM_RES_MASK);
116 if (err)
117 return err;
118
119 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
120 GFP_KERNEL);
121 if (!data)
122 return -ENOMEM;
123
124 crypto_init_wait(&data->wait);
125 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
126 skcipher_request_set_tfm(&data->req, ctr);
127 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
128 CRYPTO_TFM_REQ_MAY_BACKLOG,
129 crypto_req_done,
130 &data->wait);
131 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
132 sizeof(data->hash), data->iv);
133
134 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
135 &data->wait);
136
137 if (err)
138 goto out;
139
140 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
141 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
142 CRYPTO_TFM_REQ_MASK);
143 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
144 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
145 CRYPTO_TFM_RES_MASK);
146
147out:
148 kzfree(data);
149 return err;
150}
151
152static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
153 unsigned int authsize)
154{
155 return crypto_gcm_check_authsize(authsize);
156}
157
158static void crypto_gcm_init_common(struct aead_request *req)
159{
160 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
161 __be32 counter = cpu_to_be32(1);
162 struct scatterlist *sg;
163
164 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
165 memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
166 memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
167
168 sg_init_table(pctx->src, 3);
169 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
170 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
171 if (sg != pctx->src + 1)
172 sg_chain(pctx->src, 2, sg);
173
174 if (req->src != req->dst) {
175 sg_init_table(pctx->dst, 3);
176 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
177 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
178 if (sg != pctx->dst + 1)
179 sg_chain(pctx->dst, 2, sg);
180 }
181}
182
183static void crypto_gcm_init_crypt(struct aead_request *req,
184 unsigned int cryptlen)
185{
186 struct crypto_aead *aead = crypto_aead_reqtfm(req);
187 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
188 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
189 struct skcipher_request *skreq = &pctx->u.skreq;
190 struct scatterlist *dst;
191
192 dst = req->src == req->dst ? pctx->src : pctx->dst;
193
194 skcipher_request_set_tfm(skreq, ctx->ctr);
195 skcipher_request_set_crypt(skreq, pctx->src, dst,
196 cryptlen + sizeof(pctx->auth_tag),
197 pctx->iv);
198}
199
200static inline unsigned int gcm_remain(unsigned int len)
201{
202 len &= 0xfU;
203 return len ? 16 - len : 0;
204}
205
206static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
207
208static int gcm_hash_update(struct aead_request *req,
209 crypto_completion_t compl,
210 struct scatterlist *src,
211 unsigned int len, u32 flags)
212{
213 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
214 struct ahash_request *ahreq = &pctx->u.ahreq;
215
216 ahash_request_set_callback(ahreq, flags, compl, req);
217 ahash_request_set_crypt(ahreq, src, NULL, len);
218
219 return crypto_ahash_update(ahreq);
220}
221
222static int gcm_hash_remain(struct aead_request *req,
223 unsigned int remain,
224 crypto_completion_t compl, u32 flags)
225{
226 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
227}
228
229static int gcm_hash_len(struct aead_request *req, u32 flags)
230{
231 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
232 struct ahash_request *ahreq = &pctx->u.ahreq;
233 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
234 be128 lengths;
235
236 lengths.a = cpu_to_be64(req->assoclen * 8);
237 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
238 memcpy(pctx->iauth_tag, &lengths, 16);
239 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
240 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
241 ahash_request_set_crypt(ahreq, &pctx->sg,
242 pctx->iauth_tag, sizeof(lengths));
243
244 return crypto_ahash_finup(ahreq);
245}
246
247static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
248{
249 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
250 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
251
252 return gctx->complete(req, flags);
253}
254
255static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
256{
257 struct aead_request *req = areq->data;
258
259 if (err)
260 goto out;
261
262 err = gcm_hash_len_continue(req, 0);
263 if (err == -EINPROGRESS)
264 return;
265
266out:
267 aead_request_complete(req, err);
268}
269
270static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
271{
272 return gcm_hash_len(req, flags) ?:
273 gcm_hash_len_continue(req, flags);
274}
275
276static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
277 int err)
278{
279 struct aead_request *req = areq->data;
280
281 if (err)
282 goto out;
283
284 err = gcm_hash_crypt_remain_continue(req, 0);
285 if (err == -EINPROGRESS)
286 return;
287
288out:
289 aead_request_complete(req, err);
290}
291
292static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
293{
294 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
295 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
296 unsigned int remain;
297
298 remain = gcm_remain(gctx->cryptlen);
299 if (remain)
300 return gcm_hash_remain(req, remain,
301 gcm_hash_crypt_remain_done, flags) ?:
302 gcm_hash_crypt_remain_continue(req, flags);
303
304 return gcm_hash_crypt_remain_continue(req, flags);
305}
306
307static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
308{
309 struct aead_request *req = areq->data;
310
311 if (err)
312 goto out;
313
314 err = gcm_hash_crypt_continue(req, 0);
315 if (err == -EINPROGRESS)
316 return;
317
318out:
319 aead_request_complete(req, err);
320}
321
322static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
323{
324 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
325 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
326
327 if (gctx->cryptlen)
328 return gcm_hash_update(req, gcm_hash_crypt_done,
329 gctx->src, gctx->cryptlen, flags) ?:
330 gcm_hash_crypt_continue(req, flags);
331
332 return gcm_hash_crypt_remain_continue(req, flags);
333}
334
335static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
336 int err)
337{
338 struct aead_request *req = areq->data;
339
340 if (err)
341 goto out;
342
343 err = gcm_hash_assoc_remain_continue(req, 0);
344 if (err == -EINPROGRESS)
345 return;
346
347out:
348 aead_request_complete(req, err);
349}
350
351static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
352{
353 unsigned int remain;
354
355 remain = gcm_remain(req->assoclen);
356 if (remain)
357 return gcm_hash_remain(req, remain,
358 gcm_hash_assoc_remain_done, flags) ?:
359 gcm_hash_assoc_remain_continue(req, flags);
360
361 return gcm_hash_assoc_remain_continue(req, flags);
362}
363
364static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
365{
366 struct aead_request *req = areq->data;
367
368 if (err)
369 goto out;
370
371 err = gcm_hash_assoc_continue(req, 0);
372 if (err == -EINPROGRESS)
373 return;
374
375out:
376 aead_request_complete(req, err);
377}
378
379static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
380{
381 if (req->assoclen)
382 return gcm_hash_update(req, gcm_hash_assoc_done,
383 req->src, req->assoclen, flags) ?:
384 gcm_hash_assoc_continue(req, flags);
385
386 return gcm_hash_assoc_remain_continue(req, flags);
387}
388
389static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
390{
391 struct aead_request *req = areq->data;
392
393 if (err)
394 goto out;
395
396 err = gcm_hash_init_continue(req, 0);
397 if (err == -EINPROGRESS)
398 return;
399
400out:
401 aead_request_complete(req, err);
402}
403
404static int gcm_hash(struct aead_request *req, u32 flags)
405{
406 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
407 struct ahash_request *ahreq = &pctx->u.ahreq;
408 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
409
410 ahash_request_set_tfm(ahreq, ctx->ghash);
411
412 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
413 return crypto_ahash_init(ahreq) ?:
414 gcm_hash_init_continue(req, flags);
415}
416
417static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
418{
419 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
420 struct crypto_aead *aead = crypto_aead_reqtfm(req);
421 u8 *auth_tag = pctx->auth_tag;
422
423 crypto_xor(auth_tag, pctx->iauth_tag, 16);
424 scatterwalk_map_and_copy(auth_tag, req->dst,
425 req->assoclen + req->cryptlen,
426 crypto_aead_authsize(aead), 1);
427 return 0;
428}
429
430static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
431{
432 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
433 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
434
435 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
436 gctx->cryptlen = req->cryptlen;
437 gctx->complete = gcm_enc_copy_hash;
438
439 return gcm_hash(req, flags);
440}
441
442static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
443{
444 struct aead_request *req = areq->data;
445
446 if (err)
447 goto out;
448
449 err = gcm_encrypt_continue(req, 0);
450 if (err == -EINPROGRESS)
451 return;
452
453out:
454 aead_request_complete(req, err);
455}
456
457static int crypto_gcm_encrypt(struct aead_request *req)
458{
459 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
460 struct skcipher_request *skreq = &pctx->u.skreq;
461 u32 flags = aead_request_flags(req);
462
463 crypto_gcm_init_common(req);
464 crypto_gcm_init_crypt(req, req->cryptlen);
465 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
466
467 return crypto_skcipher_encrypt(skreq) ?:
468 gcm_encrypt_continue(req, flags);
469}
470
471static int crypto_gcm_verify(struct aead_request *req)
472{
473 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
474 struct crypto_aead *aead = crypto_aead_reqtfm(req);
475 u8 *auth_tag = pctx->auth_tag;
476 u8 *iauth_tag = pctx->iauth_tag;
477 unsigned int authsize = crypto_aead_authsize(aead);
478 unsigned int cryptlen = req->cryptlen - authsize;
479
480 crypto_xor(auth_tag, iauth_tag, 16);
481 scatterwalk_map_and_copy(iauth_tag, req->src,
482 req->assoclen + cryptlen, authsize, 0);
483 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
484}
485
486static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
487{
488 struct aead_request *req = areq->data;
489
490 if (!err)
491 err = crypto_gcm_verify(req);
492
493 aead_request_complete(req, err);
494}
495
496static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
497{
498 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
499 struct skcipher_request *skreq = &pctx->u.skreq;
500 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
501
502 crypto_gcm_init_crypt(req, gctx->cryptlen);
503 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
504 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
505}
506
507static int crypto_gcm_decrypt(struct aead_request *req)
508{
509 struct crypto_aead *aead = crypto_aead_reqtfm(req);
510 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
511 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
512 unsigned int authsize = crypto_aead_authsize(aead);
513 unsigned int cryptlen = req->cryptlen;
514 u32 flags = aead_request_flags(req);
515
516 cryptlen -= authsize;
517
518 crypto_gcm_init_common(req);
519
520 gctx->src = sg_next(pctx->src);
521 gctx->cryptlen = cryptlen;
522 gctx->complete = gcm_dec_hash_continue;
523
524 return gcm_hash(req, flags);
525}
526
527static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
528{
529 struct aead_instance *inst = aead_alg_instance(tfm);
530 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
531 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
532 struct crypto_skcipher *ctr;
533 struct crypto_ahash *ghash;
534 unsigned long align;
535 int err;
536
537 ghash = crypto_spawn_ahash(&ictx->ghash);
538 if (IS_ERR(ghash))
539 return PTR_ERR(ghash);
540
541 ctr = crypto_spawn_skcipher(&ictx->ctr);
542 err = PTR_ERR(ctr);
543 if (IS_ERR(ctr))
544 goto err_free_hash;
545
546 ctx->ctr = ctr;
547 ctx->ghash = ghash;
548
549 align = crypto_aead_alignmask(tfm);
550 align &= ~(crypto_tfm_ctx_alignment() - 1);
551 crypto_aead_set_reqsize(tfm,
552 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
553 max(sizeof(struct skcipher_request) +
554 crypto_skcipher_reqsize(ctr),
555 sizeof(struct ahash_request) +
556 crypto_ahash_reqsize(ghash)));
557
558 return 0;
559
560err_free_hash:
561 crypto_free_ahash(ghash);
562 return err;
563}
564
565static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
566{
567 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
568
569 crypto_free_ahash(ctx->ghash);
570 crypto_free_skcipher(ctx->ctr);
571}
572
573static void crypto_gcm_free(struct aead_instance *inst)
574{
575 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
576
577 crypto_drop_skcipher(&ctx->ctr);
578 crypto_drop_ahash(&ctx->ghash);
579 kfree(inst);
580}
581
582static int crypto_gcm_create_common(struct crypto_template *tmpl,
583 struct rtattr **tb,
584 const char *ctr_name,
585 const char *ghash_name)
586{
587 struct crypto_attr_type *algt;
588 struct aead_instance *inst;
589 struct skcipher_alg *ctr;
590 struct crypto_alg *ghash_alg;
591 struct hash_alg_common *ghash;
592 struct gcm_instance_ctx *ctx;
593 int err;
594
595 algt = crypto_get_attr_type(tb);
596 if (IS_ERR(algt))
597 return PTR_ERR(algt);
598
599 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
600 return -EINVAL;
601
602 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
603 CRYPTO_ALG_TYPE_HASH,
604 CRYPTO_ALG_TYPE_AHASH_MASK |
605 crypto_requires_sync(algt->type,
606 algt->mask));
607 if (IS_ERR(ghash_alg))
608 return PTR_ERR(ghash_alg);
609
610 ghash = __crypto_hash_alg_common(ghash_alg);
611
612 err = -ENOMEM;
613 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
614 if (!inst)
615 goto out_put_ghash;
616
617 ctx = aead_instance_ctx(inst);
618 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
619 aead_crypto_instance(inst));
620 if (err)
621 goto err_free_inst;
622
623 err = -EINVAL;
624 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
625 ghash->digestsize != 16)
626 goto err_drop_ghash;
627
628 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
629 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
630 crypto_requires_sync(algt->type,
631 algt->mask));
632 if (err)
633 goto err_drop_ghash;
634
635 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
636
637 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
638 err = -EINVAL;
639 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
640 crypto_skcipher_alg_ivsize(ctr) != 16 ||
641 ctr->base.cra_blocksize != 1)
642 goto out_put_ctr;
643
644 err = -ENAMETOOLONG;
645 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
646 "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
647 goto out_put_ctr;
648
649 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
650 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
651 ghash_alg->cra_driver_name) >=
652 CRYPTO_MAX_ALG_NAME)
653 goto out_put_ctr;
654
655 inst->alg.base.cra_flags = (ghash->base.cra_flags |
656 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
657 inst->alg.base.cra_priority = (ghash->base.cra_priority +
658 ctr->base.cra_priority) / 2;
659 inst->alg.base.cra_blocksize = 1;
660 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
661 ctr->base.cra_alignmask;
662 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
663 inst->alg.ivsize = GCM_AES_IV_SIZE;
664 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
665 inst->alg.maxauthsize = 16;
666 inst->alg.init = crypto_gcm_init_tfm;
667 inst->alg.exit = crypto_gcm_exit_tfm;
668 inst->alg.setkey = crypto_gcm_setkey;
669 inst->alg.setauthsize = crypto_gcm_setauthsize;
670 inst->alg.encrypt = crypto_gcm_encrypt;
671 inst->alg.decrypt = crypto_gcm_decrypt;
672
673 inst->free = crypto_gcm_free;
674
675 err = aead_register_instance(tmpl, inst);
676 if (err)
677 goto out_put_ctr;
678
679out_put_ghash:
680 crypto_mod_put(ghash_alg);
681 return err;
682
683out_put_ctr:
684 crypto_drop_skcipher(&ctx->ctr);
685err_drop_ghash:
686 crypto_drop_ahash(&ctx->ghash);
687err_free_inst:
688 kfree(inst);
689 goto out_put_ghash;
690}
691
692static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
693{
694 const char *cipher_name;
695 char ctr_name[CRYPTO_MAX_ALG_NAME];
696
697 cipher_name = crypto_attr_alg_name(tb[1]);
698 if (IS_ERR(cipher_name))
699 return PTR_ERR(cipher_name);
700
701 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
702 CRYPTO_MAX_ALG_NAME)
703 return -ENAMETOOLONG;
704
705 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
706}
707
708static int crypto_gcm_base_create(struct crypto_template *tmpl,
709 struct rtattr **tb)
710{
711 const char *ctr_name;
712 const char *ghash_name;
713
714 ctr_name = crypto_attr_alg_name(tb[1]);
715 if (IS_ERR(ctr_name))
716 return PTR_ERR(ctr_name);
717
718 ghash_name = crypto_attr_alg_name(tb[2]);
719 if (IS_ERR(ghash_name))
720 return PTR_ERR(ghash_name);
721
722 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
723}
724
725static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
726 unsigned int keylen)
727{
728 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
729 struct crypto_aead *child = ctx->child;
730 int err;
731
732 if (keylen < 4)
733 return -EINVAL;
734
735 keylen -= 4;
736 memcpy(ctx->nonce, key + keylen, 4);
737
738 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
739 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
740 CRYPTO_TFM_REQ_MASK);
741 err = crypto_aead_setkey(child, key, keylen);
742 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
743 CRYPTO_TFM_RES_MASK);
744
745 return err;
746}
747
748static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
749 unsigned int authsize)
750{
751 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
752 int err;
753
754 err = crypto_rfc4106_check_authsize(authsize);
755 if (err)
756 return err;
757
758 return crypto_aead_setauthsize(ctx->child, authsize);
759}
760
761static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
762{
763 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
764 struct crypto_aead *aead = crypto_aead_reqtfm(req);
765 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
766 struct aead_request *subreq = &rctx->subreq;
767 struct crypto_aead *child = ctx->child;
768 struct scatterlist *sg;
769 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
770 crypto_aead_alignmask(child) + 1);
771
772 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
773
774 memcpy(iv, ctx->nonce, 4);
775 memcpy(iv + 4, req->iv, 8);
776
777 sg_init_table(rctx->src, 3);
778 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
779 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
780 if (sg != rctx->src + 1)
781 sg_chain(rctx->src, 2, sg);
782
783 if (req->src != req->dst) {
784 sg_init_table(rctx->dst, 3);
785 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
786 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
787 if (sg != rctx->dst + 1)
788 sg_chain(rctx->dst, 2, sg);
789 }
790
791 aead_request_set_tfm(subreq, child);
792 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
793 req->base.data);
794 aead_request_set_crypt(subreq, rctx->src,
795 req->src == req->dst ? rctx->src : rctx->dst,
796 req->cryptlen, iv);
797 aead_request_set_ad(subreq, req->assoclen - 8);
798
799 return subreq;
800}
801
802static int crypto_rfc4106_encrypt(struct aead_request *req)
803{
804 int err;
805
806 err = crypto_ipsec_check_assoclen(req->assoclen);
807 if (err)
808 return err;
809
810 req = crypto_rfc4106_crypt(req);
811
812 return crypto_aead_encrypt(req);
813}
814
815static int crypto_rfc4106_decrypt(struct aead_request *req)
816{
817 int err;
818
819 err = crypto_ipsec_check_assoclen(req->assoclen);
820 if (err)
821 return err;
822
823 req = crypto_rfc4106_crypt(req);
824
825 return crypto_aead_decrypt(req);
826}
827
828static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
829{
830 struct aead_instance *inst = aead_alg_instance(tfm);
831 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
832 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
833 struct crypto_aead *aead;
834 unsigned long align;
835
836 aead = crypto_spawn_aead(spawn);
837 if (IS_ERR(aead))
838 return PTR_ERR(aead);
839
840 ctx->child = aead;
841
842 align = crypto_aead_alignmask(aead);
843 align &= ~(crypto_tfm_ctx_alignment() - 1);
844 crypto_aead_set_reqsize(
845 tfm,
846 sizeof(struct crypto_rfc4106_req_ctx) +
847 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
848 align + 24);
849
850 return 0;
851}
852
853static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
854{
855 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
856
857 crypto_free_aead(ctx->child);
858}
859
860static void crypto_rfc4106_free(struct aead_instance *inst)
861{
862 crypto_drop_aead(aead_instance_ctx(inst));
863 kfree(inst);
864}
865
866static int crypto_rfc4106_create(struct crypto_template *tmpl,
867 struct rtattr **tb)
868{
869 struct crypto_attr_type *algt;
870 struct aead_instance *inst;
871 struct crypto_aead_spawn *spawn;
872 struct aead_alg *alg;
873 const char *ccm_name;
874 int err;
875
876 algt = crypto_get_attr_type(tb);
877 if (IS_ERR(algt))
878 return PTR_ERR(algt);
879
880 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
881 return -EINVAL;
882
883 ccm_name = crypto_attr_alg_name(tb[1]);
884 if (IS_ERR(ccm_name))
885 return PTR_ERR(ccm_name);
886
887 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
888 if (!inst)
889 return -ENOMEM;
890
891 spawn = aead_instance_ctx(inst);
892 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
893 err = crypto_grab_aead(spawn, ccm_name, 0,
894 crypto_requires_sync(algt->type, algt->mask));
895 if (err)
896 goto out_free_inst;
897
898 alg = crypto_spawn_aead_alg(spawn);
899
900 err = -EINVAL;
901
902 /* Underlying IV size must be 12. */
903 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
904 goto out_drop_alg;
905
906 /* Not a stream cipher? */
907 if (alg->base.cra_blocksize != 1)
908 goto out_drop_alg;
909
910 err = -ENAMETOOLONG;
911 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
912 "rfc4106(%s)", alg->base.cra_name) >=
913 CRYPTO_MAX_ALG_NAME ||
914 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
915 "rfc4106(%s)", alg->base.cra_driver_name) >=
916 CRYPTO_MAX_ALG_NAME)
917 goto out_drop_alg;
918
919 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
920 inst->alg.base.cra_priority = alg->base.cra_priority;
921 inst->alg.base.cra_blocksize = 1;
922 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
923
924 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
925
926 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
927 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
928 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
929
930 inst->alg.init = crypto_rfc4106_init_tfm;
931 inst->alg.exit = crypto_rfc4106_exit_tfm;
932
933 inst->alg.setkey = crypto_rfc4106_setkey;
934 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
935 inst->alg.encrypt = crypto_rfc4106_encrypt;
936 inst->alg.decrypt = crypto_rfc4106_decrypt;
937
938 inst->free = crypto_rfc4106_free;
939
940 err = aead_register_instance(tmpl, inst);
941 if (err)
942 goto out_drop_alg;
943
944out:
945 return err;
946
947out_drop_alg:
948 crypto_drop_aead(spawn);
949out_free_inst:
950 kfree(inst);
951 goto out;
952}
953
954static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
955 unsigned int keylen)
956{
957 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
958 struct crypto_aead *child = ctx->child;
959 int err;
960
961 if (keylen < 4)
962 return -EINVAL;
963
964 keylen -= 4;
965 memcpy(ctx->nonce, key + keylen, 4);
966
967 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
968 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
969 CRYPTO_TFM_REQ_MASK);
970 err = crypto_aead_setkey(child, key, keylen);
971 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
972 CRYPTO_TFM_RES_MASK);
973
974 return err;
975}
976
977static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
978 unsigned int authsize)
979{
980 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
981
982 if (authsize != 16)
983 return -EINVAL;
984
985 return crypto_aead_setauthsize(ctx->child, authsize);
986}
987
988static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
989{
990 struct crypto_aead *aead = crypto_aead_reqtfm(req);
991 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
992 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
993 struct aead_request *subreq = &rctx->subreq;
994 unsigned int authsize = crypto_aead_authsize(aead);
995 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
996 crypto_aead_alignmask(ctx->child) + 1);
997 int err;
998
999 if (req->src != req->dst) {
1000 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1001 if (err)
1002 return err;
1003 }
1004
1005 memcpy(iv, ctx->nonce, 4);
1006 memcpy(iv + 4, req->iv, 8);
1007
1008 aead_request_set_tfm(subreq, ctx->child);
1009 aead_request_set_callback(subreq, req->base.flags,
1010 req->base.complete, req->base.data);
1011 aead_request_set_crypt(subreq, req->src, req->dst,
1012 enc ? 0 : authsize, iv);
1013 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1014 subreq->cryptlen);
1015
1016 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1017}
1018
1019static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1020{
1021 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1022 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1023 unsigned int authsize = crypto_aead_authsize(aead);
1024 unsigned int nbytes = req->assoclen + req->cryptlen -
1025 (enc ? 0 : authsize);
1026 SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1027
1028 skcipher_request_set_sync_tfm(nreq, ctx->null);
1029 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1030 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1031
1032 return crypto_skcipher_encrypt(nreq);
1033}
1034
1035static int crypto_rfc4543_encrypt(struct aead_request *req)
1036{
1037 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1038 crypto_rfc4543_crypt(req, true);
1039}
1040
1041static int crypto_rfc4543_decrypt(struct aead_request *req)
1042{
1043 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1044 crypto_rfc4543_crypt(req, false);
1045}
1046
1047static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1048{
1049 struct aead_instance *inst = aead_alg_instance(tfm);
1050 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1051 struct crypto_aead_spawn *spawn = &ictx->aead;
1052 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1053 struct crypto_aead *aead;
1054 struct crypto_sync_skcipher *null;
1055 unsigned long align;
1056 int err = 0;
1057
1058 aead = crypto_spawn_aead(spawn);
1059 if (IS_ERR(aead))
1060 return PTR_ERR(aead);
1061
1062 null = crypto_get_default_null_skcipher();
1063 err = PTR_ERR(null);
1064 if (IS_ERR(null))
1065 goto err_free_aead;
1066
1067 ctx->child = aead;
1068 ctx->null = null;
1069
1070 align = crypto_aead_alignmask(aead);
1071 align &= ~(crypto_tfm_ctx_alignment() - 1);
1072 crypto_aead_set_reqsize(
1073 tfm,
1074 sizeof(struct crypto_rfc4543_req_ctx) +
1075 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1076 align + GCM_AES_IV_SIZE);
1077
1078 return 0;
1079
1080err_free_aead:
1081 crypto_free_aead(aead);
1082 return err;
1083}
1084
1085static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1086{
1087 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1088
1089 crypto_free_aead(ctx->child);
1090 crypto_put_default_null_skcipher();
1091}
1092
1093static void crypto_rfc4543_free(struct aead_instance *inst)
1094{
1095 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1096
1097 crypto_drop_aead(&ctx->aead);
1098
1099 kfree(inst);
1100}
1101
1102static int crypto_rfc4543_create(struct crypto_template *tmpl,
1103 struct rtattr **tb)
1104{
1105 struct crypto_attr_type *algt;
1106 struct aead_instance *inst;
1107 struct crypto_aead_spawn *spawn;
1108 struct aead_alg *alg;
1109 struct crypto_rfc4543_instance_ctx *ctx;
1110 const char *ccm_name;
1111 int err;
1112
1113 algt = crypto_get_attr_type(tb);
1114 if (IS_ERR(algt))
1115 return PTR_ERR(algt);
1116
1117 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1118 return -EINVAL;
1119
1120 ccm_name = crypto_attr_alg_name(tb[1]);
1121 if (IS_ERR(ccm_name))
1122 return PTR_ERR(ccm_name);
1123
1124 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1125 if (!inst)
1126 return -ENOMEM;
1127
1128 ctx = aead_instance_ctx(inst);
1129 spawn = &ctx->aead;
1130 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1131 err = crypto_grab_aead(spawn, ccm_name, 0,
1132 crypto_requires_sync(algt->type, algt->mask));
1133 if (err)
1134 goto out_free_inst;
1135
1136 alg = crypto_spawn_aead_alg(spawn);
1137
1138 err = -EINVAL;
1139
1140 /* Underlying IV size must be 12. */
1141 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1142 goto out_drop_alg;
1143
1144 /* Not a stream cipher? */
1145 if (alg->base.cra_blocksize != 1)
1146 goto out_drop_alg;
1147
1148 err = -ENAMETOOLONG;
1149 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1150 "rfc4543(%s)", alg->base.cra_name) >=
1151 CRYPTO_MAX_ALG_NAME ||
1152 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1153 "rfc4543(%s)", alg->base.cra_driver_name) >=
1154 CRYPTO_MAX_ALG_NAME)
1155 goto out_drop_alg;
1156
1157 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1158 inst->alg.base.cra_priority = alg->base.cra_priority;
1159 inst->alg.base.cra_blocksize = 1;
1160 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1161
1162 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1163
1164 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1165 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1166 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1167
1168 inst->alg.init = crypto_rfc4543_init_tfm;
1169 inst->alg.exit = crypto_rfc4543_exit_tfm;
1170
1171 inst->alg.setkey = crypto_rfc4543_setkey;
1172 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1173 inst->alg.encrypt = crypto_rfc4543_encrypt;
1174 inst->alg.decrypt = crypto_rfc4543_decrypt;
1175
1176 inst->free = crypto_rfc4543_free,
1177
1178 err = aead_register_instance(tmpl, inst);
1179 if (err)
1180 goto out_drop_alg;
1181
1182out:
1183 return err;
1184
1185out_drop_alg:
1186 crypto_drop_aead(spawn);
1187out_free_inst:
1188 kfree(inst);
1189 goto out;
1190}
1191
1192static struct crypto_template crypto_gcm_tmpls[] = {
1193 {
1194 .name = "gcm_base",
1195 .create = crypto_gcm_base_create,
1196 .module = THIS_MODULE,
1197 }, {
1198 .name = "gcm",
1199 .create = crypto_gcm_create,
1200 .module = THIS_MODULE,
1201 }, {
1202 .name = "rfc4106",
1203 .create = crypto_rfc4106_create,
1204 .module = THIS_MODULE,
1205 }, {
1206 .name = "rfc4543",
1207 .create = crypto_rfc4543_create,
1208 .module = THIS_MODULE,
1209 },
1210};
1211
1212static int __init crypto_gcm_module_init(void)
1213{
1214 int err;
1215
1216 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1217 if (!gcm_zeroes)
1218 return -ENOMEM;
1219
1220 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1221
1222 err = crypto_register_templates(crypto_gcm_tmpls,
1223 ARRAY_SIZE(crypto_gcm_tmpls));
1224 if (err)
1225 kfree(gcm_zeroes);
1226
1227 return err;
1228}
1229
1230static void __exit crypto_gcm_module_exit(void)
1231{
1232 kfree(gcm_zeroes);
1233 crypto_unregister_templates(crypto_gcm_tmpls,
1234 ARRAY_SIZE(crypto_gcm_tmpls));
1235}
1236
1237subsys_initcall(crypto_gcm_module_init);
1238module_exit(crypto_gcm_module_exit);
1239
1240MODULE_LICENSE("GPL");
1241MODULE_DESCRIPTION("Galois/Counter Mode");
1242MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1243MODULE_ALIAS_CRYPTO("gcm_base");
1244MODULE_ALIAS_CRYPTO("rfc4106");
1245MODULE_ALIAS_CRYPTO("rfc4543");
1246MODULE_ALIAS_CRYPTO("gcm");
1/*
2 * GCM: Galois/Counter Mode.
3 *
4 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
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 version 2 as published
8 * by the Free Software Foundation.
9 */
10
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/null.h>
16#include <crypto/scatterwalk.h>
17#include <crypto/gcm.h>
18#include <crypto/hash.h>
19#include "internal.h"
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25
26struct gcm_instance_ctx {
27 struct crypto_skcipher_spawn ctr;
28 struct crypto_ahash_spawn ghash;
29};
30
31struct crypto_gcm_ctx {
32 struct crypto_skcipher *ctr;
33 struct crypto_ahash *ghash;
34};
35
36struct crypto_rfc4106_ctx {
37 struct crypto_aead *child;
38 u8 nonce[4];
39};
40
41struct crypto_rfc4106_req_ctx {
42 struct scatterlist src[3];
43 struct scatterlist dst[3];
44 struct aead_request subreq;
45};
46
47struct crypto_rfc4543_instance_ctx {
48 struct crypto_aead_spawn aead;
49};
50
51struct crypto_rfc4543_ctx {
52 struct crypto_aead *child;
53 struct crypto_skcipher *null;
54 u8 nonce[4];
55};
56
57struct crypto_rfc4543_req_ctx {
58 struct aead_request subreq;
59};
60
61struct crypto_gcm_ghash_ctx {
62 unsigned int cryptlen;
63 struct scatterlist *src;
64 int (*complete)(struct aead_request *req, u32 flags);
65};
66
67struct crypto_gcm_req_priv_ctx {
68 u8 iv[16];
69 u8 auth_tag[16];
70 u8 iauth_tag[16];
71 struct scatterlist src[3];
72 struct scatterlist dst[3];
73 struct scatterlist sg;
74 struct crypto_gcm_ghash_ctx ghash_ctx;
75 union {
76 struct ahash_request ahreq;
77 struct skcipher_request skreq;
78 } u;
79};
80
81static struct {
82 u8 buf[16];
83 struct scatterlist sg;
84} *gcm_zeroes;
85
86static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
87
88static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
89 struct aead_request *req)
90{
91 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
92
93 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
94}
95
96static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
97 unsigned int keylen)
98{
99 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
100 struct crypto_ahash *ghash = ctx->ghash;
101 struct crypto_skcipher *ctr = ctx->ctr;
102 struct {
103 be128 hash;
104 u8 iv[16];
105
106 struct crypto_wait wait;
107
108 struct scatterlist sg[1];
109 struct skcipher_request req;
110 } *data;
111 int err;
112
113 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
114 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
115 CRYPTO_TFM_REQ_MASK);
116 err = crypto_skcipher_setkey(ctr, key, keylen);
117 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
118 CRYPTO_TFM_RES_MASK);
119 if (err)
120 return err;
121
122 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
123 GFP_KERNEL);
124 if (!data)
125 return -ENOMEM;
126
127 crypto_init_wait(&data->wait);
128 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
129 skcipher_request_set_tfm(&data->req, ctr);
130 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
131 CRYPTO_TFM_REQ_MAY_BACKLOG,
132 crypto_req_done,
133 &data->wait);
134 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
135 sizeof(data->hash), data->iv);
136
137 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
138 &data->wait);
139
140 if (err)
141 goto out;
142
143 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
144 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
145 CRYPTO_TFM_REQ_MASK);
146 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
147 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
148 CRYPTO_TFM_RES_MASK);
149
150out:
151 kzfree(data);
152 return err;
153}
154
155static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
156 unsigned int authsize)
157{
158 switch (authsize) {
159 case 4:
160 case 8:
161 case 12:
162 case 13:
163 case 14:
164 case 15:
165 case 16:
166 break;
167 default:
168 return -EINVAL;
169 }
170
171 return 0;
172}
173
174static void crypto_gcm_init_common(struct aead_request *req)
175{
176 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
177 __be32 counter = cpu_to_be32(1);
178 struct scatterlist *sg;
179
180 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
181 memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
182 memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
183
184 sg_init_table(pctx->src, 3);
185 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
186 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
187 if (sg != pctx->src + 1)
188 sg_chain(pctx->src, 2, sg);
189
190 if (req->src != req->dst) {
191 sg_init_table(pctx->dst, 3);
192 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
193 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
194 if (sg != pctx->dst + 1)
195 sg_chain(pctx->dst, 2, sg);
196 }
197}
198
199static void crypto_gcm_init_crypt(struct aead_request *req,
200 unsigned int cryptlen)
201{
202 struct crypto_aead *aead = crypto_aead_reqtfm(req);
203 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
204 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
205 struct skcipher_request *skreq = &pctx->u.skreq;
206 struct scatterlist *dst;
207
208 dst = req->src == req->dst ? pctx->src : pctx->dst;
209
210 skcipher_request_set_tfm(skreq, ctx->ctr);
211 skcipher_request_set_crypt(skreq, pctx->src, dst,
212 cryptlen + sizeof(pctx->auth_tag),
213 pctx->iv);
214}
215
216static inline unsigned int gcm_remain(unsigned int len)
217{
218 len &= 0xfU;
219 return len ? 16 - len : 0;
220}
221
222static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
223
224static int gcm_hash_update(struct aead_request *req,
225 crypto_completion_t compl,
226 struct scatterlist *src,
227 unsigned int len, u32 flags)
228{
229 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
230 struct ahash_request *ahreq = &pctx->u.ahreq;
231
232 ahash_request_set_callback(ahreq, flags, compl, req);
233 ahash_request_set_crypt(ahreq, src, NULL, len);
234
235 return crypto_ahash_update(ahreq);
236}
237
238static int gcm_hash_remain(struct aead_request *req,
239 unsigned int remain,
240 crypto_completion_t compl, u32 flags)
241{
242 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
243}
244
245static int gcm_hash_len(struct aead_request *req, u32 flags)
246{
247 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
248 struct ahash_request *ahreq = &pctx->u.ahreq;
249 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
250 u128 lengths;
251
252 lengths.a = cpu_to_be64(req->assoclen * 8);
253 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
254 memcpy(pctx->iauth_tag, &lengths, 16);
255 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
256 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
257 ahash_request_set_crypt(ahreq, &pctx->sg,
258 pctx->iauth_tag, sizeof(lengths));
259
260 return crypto_ahash_finup(ahreq);
261}
262
263static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
264{
265 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
266 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
267
268 return gctx->complete(req, flags);
269}
270
271static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
272{
273 struct aead_request *req = areq->data;
274
275 if (err)
276 goto out;
277
278 err = gcm_hash_len_continue(req, 0);
279 if (err == -EINPROGRESS)
280 return;
281
282out:
283 aead_request_complete(req, err);
284}
285
286static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
287{
288 return gcm_hash_len(req, flags) ?:
289 gcm_hash_len_continue(req, flags);
290}
291
292static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
293 int err)
294{
295 struct aead_request *req = areq->data;
296
297 if (err)
298 goto out;
299
300 err = gcm_hash_crypt_remain_continue(req, 0);
301 if (err == -EINPROGRESS)
302 return;
303
304out:
305 aead_request_complete(req, err);
306}
307
308static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
309{
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
312 unsigned int remain;
313
314 remain = gcm_remain(gctx->cryptlen);
315 if (remain)
316 return gcm_hash_remain(req, remain,
317 gcm_hash_crypt_remain_done, flags) ?:
318 gcm_hash_crypt_remain_continue(req, flags);
319
320 return gcm_hash_crypt_remain_continue(req, flags);
321}
322
323static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
324{
325 struct aead_request *req = areq->data;
326
327 if (err)
328 goto out;
329
330 err = gcm_hash_crypt_continue(req, 0);
331 if (err == -EINPROGRESS)
332 return;
333
334out:
335 aead_request_complete(req, err);
336}
337
338static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
339{
340 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
341 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
342
343 if (gctx->cryptlen)
344 return gcm_hash_update(req, gcm_hash_crypt_done,
345 gctx->src, gctx->cryptlen, flags) ?:
346 gcm_hash_crypt_continue(req, flags);
347
348 return gcm_hash_crypt_remain_continue(req, flags);
349}
350
351static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
352 int err)
353{
354 struct aead_request *req = areq->data;
355
356 if (err)
357 goto out;
358
359 err = gcm_hash_assoc_remain_continue(req, 0);
360 if (err == -EINPROGRESS)
361 return;
362
363out:
364 aead_request_complete(req, err);
365}
366
367static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
368{
369 unsigned int remain;
370
371 remain = gcm_remain(req->assoclen);
372 if (remain)
373 return gcm_hash_remain(req, remain,
374 gcm_hash_assoc_remain_done, flags) ?:
375 gcm_hash_assoc_remain_continue(req, flags);
376
377 return gcm_hash_assoc_remain_continue(req, flags);
378}
379
380static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
381{
382 struct aead_request *req = areq->data;
383
384 if (err)
385 goto out;
386
387 err = gcm_hash_assoc_continue(req, 0);
388 if (err == -EINPROGRESS)
389 return;
390
391out:
392 aead_request_complete(req, err);
393}
394
395static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
396{
397 if (req->assoclen)
398 return gcm_hash_update(req, gcm_hash_assoc_done,
399 req->src, req->assoclen, flags) ?:
400 gcm_hash_assoc_continue(req, flags);
401
402 return gcm_hash_assoc_remain_continue(req, flags);
403}
404
405static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
406{
407 struct aead_request *req = areq->data;
408
409 if (err)
410 goto out;
411
412 err = gcm_hash_init_continue(req, 0);
413 if (err == -EINPROGRESS)
414 return;
415
416out:
417 aead_request_complete(req, err);
418}
419
420static int gcm_hash(struct aead_request *req, u32 flags)
421{
422 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
423 struct ahash_request *ahreq = &pctx->u.ahreq;
424 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
425
426 ahash_request_set_tfm(ahreq, ctx->ghash);
427
428 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
429 return crypto_ahash_init(ahreq) ?:
430 gcm_hash_init_continue(req, flags);
431}
432
433static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
434{
435 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
436 struct crypto_aead *aead = crypto_aead_reqtfm(req);
437 u8 *auth_tag = pctx->auth_tag;
438
439 crypto_xor(auth_tag, pctx->iauth_tag, 16);
440 scatterwalk_map_and_copy(auth_tag, req->dst,
441 req->assoclen + req->cryptlen,
442 crypto_aead_authsize(aead), 1);
443 return 0;
444}
445
446static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
447{
448 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
449 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
450
451 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
452 gctx->cryptlen = req->cryptlen;
453 gctx->complete = gcm_enc_copy_hash;
454
455 return gcm_hash(req, flags);
456}
457
458static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
459{
460 struct aead_request *req = areq->data;
461
462 if (err)
463 goto out;
464
465 err = gcm_encrypt_continue(req, 0);
466 if (err == -EINPROGRESS)
467 return;
468
469out:
470 aead_request_complete(req, err);
471}
472
473static int crypto_gcm_encrypt(struct aead_request *req)
474{
475 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
476 struct skcipher_request *skreq = &pctx->u.skreq;
477 u32 flags = aead_request_flags(req);
478
479 crypto_gcm_init_common(req);
480 crypto_gcm_init_crypt(req, req->cryptlen);
481 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
482
483 return crypto_skcipher_encrypt(skreq) ?:
484 gcm_encrypt_continue(req, flags);
485}
486
487static int crypto_gcm_verify(struct aead_request *req)
488{
489 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
490 struct crypto_aead *aead = crypto_aead_reqtfm(req);
491 u8 *auth_tag = pctx->auth_tag;
492 u8 *iauth_tag = pctx->iauth_tag;
493 unsigned int authsize = crypto_aead_authsize(aead);
494 unsigned int cryptlen = req->cryptlen - authsize;
495
496 crypto_xor(auth_tag, iauth_tag, 16);
497 scatterwalk_map_and_copy(iauth_tag, req->src,
498 req->assoclen + cryptlen, authsize, 0);
499 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
500}
501
502static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
503{
504 struct aead_request *req = areq->data;
505
506 if (!err)
507 err = crypto_gcm_verify(req);
508
509 aead_request_complete(req, err);
510}
511
512static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
513{
514 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
515 struct skcipher_request *skreq = &pctx->u.skreq;
516 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
517
518 crypto_gcm_init_crypt(req, gctx->cryptlen);
519 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
520 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
521}
522
523static int crypto_gcm_decrypt(struct aead_request *req)
524{
525 struct crypto_aead *aead = crypto_aead_reqtfm(req);
526 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
527 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
528 unsigned int authsize = crypto_aead_authsize(aead);
529 unsigned int cryptlen = req->cryptlen;
530 u32 flags = aead_request_flags(req);
531
532 cryptlen -= authsize;
533
534 crypto_gcm_init_common(req);
535
536 gctx->src = sg_next(pctx->src);
537 gctx->cryptlen = cryptlen;
538 gctx->complete = gcm_dec_hash_continue;
539
540 return gcm_hash(req, flags);
541}
542
543static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
544{
545 struct aead_instance *inst = aead_alg_instance(tfm);
546 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
547 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
548 struct crypto_skcipher *ctr;
549 struct crypto_ahash *ghash;
550 unsigned long align;
551 int err;
552
553 ghash = crypto_spawn_ahash(&ictx->ghash);
554 if (IS_ERR(ghash))
555 return PTR_ERR(ghash);
556
557 ctr = crypto_spawn_skcipher(&ictx->ctr);
558 err = PTR_ERR(ctr);
559 if (IS_ERR(ctr))
560 goto err_free_hash;
561
562 ctx->ctr = ctr;
563 ctx->ghash = ghash;
564
565 align = crypto_aead_alignmask(tfm);
566 align &= ~(crypto_tfm_ctx_alignment() - 1);
567 crypto_aead_set_reqsize(tfm,
568 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
569 max(sizeof(struct skcipher_request) +
570 crypto_skcipher_reqsize(ctr),
571 sizeof(struct ahash_request) +
572 crypto_ahash_reqsize(ghash)));
573
574 return 0;
575
576err_free_hash:
577 crypto_free_ahash(ghash);
578 return err;
579}
580
581static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
582{
583 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
584
585 crypto_free_ahash(ctx->ghash);
586 crypto_free_skcipher(ctx->ctr);
587}
588
589static void crypto_gcm_free(struct aead_instance *inst)
590{
591 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
592
593 crypto_drop_skcipher(&ctx->ctr);
594 crypto_drop_ahash(&ctx->ghash);
595 kfree(inst);
596}
597
598static int crypto_gcm_create_common(struct crypto_template *tmpl,
599 struct rtattr **tb,
600 const char *full_name,
601 const char *ctr_name,
602 const char *ghash_name)
603{
604 struct crypto_attr_type *algt;
605 struct aead_instance *inst;
606 struct skcipher_alg *ctr;
607 struct crypto_alg *ghash_alg;
608 struct hash_alg_common *ghash;
609 struct gcm_instance_ctx *ctx;
610 int err;
611
612 algt = crypto_get_attr_type(tb);
613 if (IS_ERR(algt))
614 return PTR_ERR(algt);
615
616 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
617 return -EINVAL;
618
619 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
620 CRYPTO_ALG_TYPE_HASH,
621 CRYPTO_ALG_TYPE_AHASH_MASK |
622 crypto_requires_sync(algt->type,
623 algt->mask));
624 if (IS_ERR(ghash_alg))
625 return PTR_ERR(ghash_alg);
626
627 ghash = __crypto_hash_alg_common(ghash_alg);
628
629 err = -ENOMEM;
630 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
631 if (!inst)
632 goto out_put_ghash;
633
634 ctx = aead_instance_ctx(inst);
635 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
636 aead_crypto_instance(inst));
637 if (err)
638 goto err_free_inst;
639
640 err = -EINVAL;
641 if (ghash->digestsize != 16)
642 goto err_drop_ghash;
643
644 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
645 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
646 crypto_requires_sync(algt->type,
647 algt->mask));
648 if (err)
649 goto err_drop_ghash;
650
651 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
652
653 /* We only support 16-byte blocks. */
654 err = -EINVAL;
655 if (crypto_skcipher_alg_ivsize(ctr) != 16)
656 goto out_put_ctr;
657
658 /* Not a stream cipher? */
659 if (ctr->base.cra_blocksize != 1)
660 goto out_put_ctr;
661
662 err = -ENAMETOOLONG;
663 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
664 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
665 ghash_alg->cra_driver_name) >=
666 CRYPTO_MAX_ALG_NAME)
667 goto out_put_ctr;
668
669 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
670
671 inst->alg.base.cra_flags = (ghash->base.cra_flags |
672 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
673 inst->alg.base.cra_priority = (ghash->base.cra_priority +
674 ctr->base.cra_priority) / 2;
675 inst->alg.base.cra_blocksize = 1;
676 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
677 ctr->base.cra_alignmask;
678 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
679 inst->alg.ivsize = GCM_AES_IV_SIZE;
680 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
681 inst->alg.maxauthsize = 16;
682 inst->alg.init = crypto_gcm_init_tfm;
683 inst->alg.exit = crypto_gcm_exit_tfm;
684 inst->alg.setkey = crypto_gcm_setkey;
685 inst->alg.setauthsize = crypto_gcm_setauthsize;
686 inst->alg.encrypt = crypto_gcm_encrypt;
687 inst->alg.decrypt = crypto_gcm_decrypt;
688
689 inst->free = crypto_gcm_free;
690
691 err = aead_register_instance(tmpl, inst);
692 if (err)
693 goto out_put_ctr;
694
695out_put_ghash:
696 crypto_mod_put(ghash_alg);
697 return err;
698
699out_put_ctr:
700 crypto_drop_skcipher(&ctx->ctr);
701err_drop_ghash:
702 crypto_drop_ahash(&ctx->ghash);
703err_free_inst:
704 kfree(inst);
705 goto out_put_ghash;
706}
707
708static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
709{
710 const char *cipher_name;
711 char ctr_name[CRYPTO_MAX_ALG_NAME];
712 char full_name[CRYPTO_MAX_ALG_NAME];
713
714 cipher_name = crypto_attr_alg_name(tb[1]);
715 if (IS_ERR(cipher_name))
716 return PTR_ERR(cipher_name);
717
718 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
719 CRYPTO_MAX_ALG_NAME)
720 return -ENAMETOOLONG;
721
722 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
723 CRYPTO_MAX_ALG_NAME)
724 return -ENAMETOOLONG;
725
726 return crypto_gcm_create_common(tmpl, tb, full_name,
727 ctr_name, "ghash");
728}
729
730static struct crypto_template crypto_gcm_tmpl = {
731 .name = "gcm",
732 .create = crypto_gcm_create,
733 .module = THIS_MODULE,
734};
735
736static int crypto_gcm_base_create(struct crypto_template *tmpl,
737 struct rtattr **tb)
738{
739 const char *ctr_name;
740 const char *ghash_name;
741 char full_name[CRYPTO_MAX_ALG_NAME];
742
743 ctr_name = crypto_attr_alg_name(tb[1]);
744 if (IS_ERR(ctr_name))
745 return PTR_ERR(ctr_name);
746
747 ghash_name = crypto_attr_alg_name(tb[2]);
748 if (IS_ERR(ghash_name))
749 return PTR_ERR(ghash_name);
750
751 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
752 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
753 return -ENAMETOOLONG;
754
755 return crypto_gcm_create_common(tmpl, tb, full_name,
756 ctr_name, ghash_name);
757}
758
759static struct crypto_template crypto_gcm_base_tmpl = {
760 .name = "gcm_base",
761 .create = crypto_gcm_base_create,
762 .module = THIS_MODULE,
763};
764
765static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
766 unsigned int keylen)
767{
768 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
769 struct crypto_aead *child = ctx->child;
770 int err;
771
772 if (keylen < 4)
773 return -EINVAL;
774
775 keylen -= 4;
776 memcpy(ctx->nonce, key + keylen, 4);
777
778 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
779 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
780 CRYPTO_TFM_REQ_MASK);
781 err = crypto_aead_setkey(child, key, keylen);
782 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
783 CRYPTO_TFM_RES_MASK);
784
785 return err;
786}
787
788static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
789 unsigned int authsize)
790{
791 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
792
793 switch (authsize) {
794 case 8:
795 case 12:
796 case 16:
797 break;
798 default:
799 return -EINVAL;
800 }
801
802 return crypto_aead_setauthsize(ctx->child, authsize);
803}
804
805static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
806{
807 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
808 struct crypto_aead *aead = crypto_aead_reqtfm(req);
809 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
810 struct aead_request *subreq = &rctx->subreq;
811 struct crypto_aead *child = ctx->child;
812 struct scatterlist *sg;
813 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
814 crypto_aead_alignmask(child) + 1);
815
816 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
817
818 memcpy(iv, ctx->nonce, 4);
819 memcpy(iv + 4, req->iv, 8);
820
821 sg_init_table(rctx->src, 3);
822 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
823 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
824 if (sg != rctx->src + 1)
825 sg_chain(rctx->src, 2, sg);
826
827 if (req->src != req->dst) {
828 sg_init_table(rctx->dst, 3);
829 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
830 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
831 if (sg != rctx->dst + 1)
832 sg_chain(rctx->dst, 2, sg);
833 }
834
835 aead_request_set_tfm(subreq, child);
836 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
837 req->base.data);
838 aead_request_set_crypt(subreq, rctx->src,
839 req->src == req->dst ? rctx->src : rctx->dst,
840 req->cryptlen, iv);
841 aead_request_set_ad(subreq, req->assoclen - 8);
842
843 return subreq;
844}
845
846static int crypto_rfc4106_encrypt(struct aead_request *req)
847{
848 if (req->assoclen != 16 && req->assoclen != 20)
849 return -EINVAL;
850
851 req = crypto_rfc4106_crypt(req);
852
853 return crypto_aead_encrypt(req);
854}
855
856static int crypto_rfc4106_decrypt(struct aead_request *req)
857{
858 if (req->assoclen != 16 && req->assoclen != 20)
859 return -EINVAL;
860
861 req = crypto_rfc4106_crypt(req);
862
863 return crypto_aead_decrypt(req);
864}
865
866static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
867{
868 struct aead_instance *inst = aead_alg_instance(tfm);
869 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
870 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
871 struct crypto_aead *aead;
872 unsigned long align;
873
874 aead = crypto_spawn_aead(spawn);
875 if (IS_ERR(aead))
876 return PTR_ERR(aead);
877
878 ctx->child = aead;
879
880 align = crypto_aead_alignmask(aead);
881 align &= ~(crypto_tfm_ctx_alignment() - 1);
882 crypto_aead_set_reqsize(
883 tfm,
884 sizeof(struct crypto_rfc4106_req_ctx) +
885 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
886 align + 24);
887
888 return 0;
889}
890
891static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
892{
893 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
894
895 crypto_free_aead(ctx->child);
896}
897
898static void crypto_rfc4106_free(struct aead_instance *inst)
899{
900 crypto_drop_aead(aead_instance_ctx(inst));
901 kfree(inst);
902}
903
904static int crypto_rfc4106_create(struct crypto_template *tmpl,
905 struct rtattr **tb)
906{
907 struct crypto_attr_type *algt;
908 struct aead_instance *inst;
909 struct crypto_aead_spawn *spawn;
910 struct aead_alg *alg;
911 const char *ccm_name;
912 int err;
913
914 algt = crypto_get_attr_type(tb);
915 if (IS_ERR(algt))
916 return PTR_ERR(algt);
917
918 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
919 return -EINVAL;
920
921 ccm_name = crypto_attr_alg_name(tb[1]);
922 if (IS_ERR(ccm_name))
923 return PTR_ERR(ccm_name);
924
925 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
926 if (!inst)
927 return -ENOMEM;
928
929 spawn = aead_instance_ctx(inst);
930 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
931 err = crypto_grab_aead(spawn, ccm_name, 0,
932 crypto_requires_sync(algt->type, algt->mask));
933 if (err)
934 goto out_free_inst;
935
936 alg = crypto_spawn_aead_alg(spawn);
937
938 err = -EINVAL;
939
940 /* Underlying IV size must be 12. */
941 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
942 goto out_drop_alg;
943
944 /* Not a stream cipher? */
945 if (alg->base.cra_blocksize != 1)
946 goto out_drop_alg;
947
948 err = -ENAMETOOLONG;
949 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
950 "rfc4106(%s)", alg->base.cra_name) >=
951 CRYPTO_MAX_ALG_NAME ||
952 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
953 "rfc4106(%s)", alg->base.cra_driver_name) >=
954 CRYPTO_MAX_ALG_NAME)
955 goto out_drop_alg;
956
957 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
958 inst->alg.base.cra_priority = alg->base.cra_priority;
959 inst->alg.base.cra_blocksize = 1;
960 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
961
962 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
963
964 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
965 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
966 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
967
968 inst->alg.init = crypto_rfc4106_init_tfm;
969 inst->alg.exit = crypto_rfc4106_exit_tfm;
970
971 inst->alg.setkey = crypto_rfc4106_setkey;
972 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
973 inst->alg.encrypt = crypto_rfc4106_encrypt;
974 inst->alg.decrypt = crypto_rfc4106_decrypt;
975
976 inst->free = crypto_rfc4106_free;
977
978 err = aead_register_instance(tmpl, inst);
979 if (err)
980 goto out_drop_alg;
981
982out:
983 return err;
984
985out_drop_alg:
986 crypto_drop_aead(spawn);
987out_free_inst:
988 kfree(inst);
989 goto out;
990}
991
992static struct crypto_template crypto_rfc4106_tmpl = {
993 .name = "rfc4106",
994 .create = crypto_rfc4106_create,
995 .module = THIS_MODULE,
996};
997
998static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
999 unsigned int keylen)
1000{
1001 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1002 struct crypto_aead *child = ctx->child;
1003 int err;
1004
1005 if (keylen < 4)
1006 return -EINVAL;
1007
1008 keylen -= 4;
1009 memcpy(ctx->nonce, key + keylen, 4);
1010
1011 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1012 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1013 CRYPTO_TFM_REQ_MASK);
1014 err = crypto_aead_setkey(child, key, keylen);
1015 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1016 CRYPTO_TFM_RES_MASK);
1017
1018 return err;
1019}
1020
1021static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1022 unsigned int authsize)
1023{
1024 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1025
1026 if (authsize != 16)
1027 return -EINVAL;
1028
1029 return crypto_aead_setauthsize(ctx->child, authsize);
1030}
1031
1032static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1033{
1034 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1035 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1036 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1037 struct aead_request *subreq = &rctx->subreq;
1038 unsigned int authsize = crypto_aead_authsize(aead);
1039 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1040 crypto_aead_alignmask(ctx->child) + 1);
1041 int err;
1042
1043 if (req->src != req->dst) {
1044 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1045 if (err)
1046 return err;
1047 }
1048
1049 memcpy(iv, ctx->nonce, 4);
1050 memcpy(iv + 4, req->iv, 8);
1051
1052 aead_request_set_tfm(subreq, ctx->child);
1053 aead_request_set_callback(subreq, req->base.flags,
1054 req->base.complete, req->base.data);
1055 aead_request_set_crypt(subreq, req->src, req->dst,
1056 enc ? 0 : authsize, iv);
1057 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1058 subreq->cryptlen);
1059
1060 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1061}
1062
1063static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1064{
1065 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1066 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1067 unsigned int authsize = crypto_aead_authsize(aead);
1068 unsigned int nbytes = req->assoclen + req->cryptlen -
1069 (enc ? 0 : authsize);
1070 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1071
1072 skcipher_request_set_tfm(nreq, ctx->null);
1073 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1074 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1075
1076 return crypto_skcipher_encrypt(nreq);
1077}
1078
1079static int crypto_rfc4543_encrypt(struct aead_request *req)
1080{
1081 return crypto_rfc4543_crypt(req, true);
1082}
1083
1084static int crypto_rfc4543_decrypt(struct aead_request *req)
1085{
1086 return crypto_rfc4543_crypt(req, false);
1087}
1088
1089static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1090{
1091 struct aead_instance *inst = aead_alg_instance(tfm);
1092 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1093 struct crypto_aead_spawn *spawn = &ictx->aead;
1094 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1095 struct crypto_aead *aead;
1096 struct crypto_skcipher *null;
1097 unsigned long align;
1098 int err = 0;
1099
1100 aead = crypto_spawn_aead(spawn);
1101 if (IS_ERR(aead))
1102 return PTR_ERR(aead);
1103
1104 null = crypto_get_default_null_skcipher();
1105 err = PTR_ERR(null);
1106 if (IS_ERR(null))
1107 goto err_free_aead;
1108
1109 ctx->child = aead;
1110 ctx->null = null;
1111
1112 align = crypto_aead_alignmask(aead);
1113 align &= ~(crypto_tfm_ctx_alignment() - 1);
1114 crypto_aead_set_reqsize(
1115 tfm,
1116 sizeof(struct crypto_rfc4543_req_ctx) +
1117 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1118 align + GCM_AES_IV_SIZE);
1119
1120 return 0;
1121
1122err_free_aead:
1123 crypto_free_aead(aead);
1124 return err;
1125}
1126
1127static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1128{
1129 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1130
1131 crypto_free_aead(ctx->child);
1132 crypto_put_default_null_skcipher();
1133}
1134
1135static void crypto_rfc4543_free(struct aead_instance *inst)
1136{
1137 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1138
1139 crypto_drop_aead(&ctx->aead);
1140
1141 kfree(inst);
1142}
1143
1144static int crypto_rfc4543_create(struct crypto_template *tmpl,
1145 struct rtattr **tb)
1146{
1147 struct crypto_attr_type *algt;
1148 struct aead_instance *inst;
1149 struct crypto_aead_spawn *spawn;
1150 struct aead_alg *alg;
1151 struct crypto_rfc4543_instance_ctx *ctx;
1152 const char *ccm_name;
1153 int err;
1154
1155 algt = crypto_get_attr_type(tb);
1156 if (IS_ERR(algt))
1157 return PTR_ERR(algt);
1158
1159 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1160 return -EINVAL;
1161
1162 ccm_name = crypto_attr_alg_name(tb[1]);
1163 if (IS_ERR(ccm_name))
1164 return PTR_ERR(ccm_name);
1165
1166 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1167 if (!inst)
1168 return -ENOMEM;
1169
1170 ctx = aead_instance_ctx(inst);
1171 spawn = &ctx->aead;
1172 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1173 err = crypto_grab_aead(spawn, ccm_name, 0,
1174 crypto_requires_sync(algt->type, algt->mask));
1175 if (err)
1176 goto out_free_inst;
1177
1178 alg = crypto_spawn_aead_alg(spawn);
1179
1180 err = -EINVAL;
1181
1182 /* Underlying IV size must be 12. */
1183 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1184 goto out_drop_alg;
1185
1186 /* Not a stream cipher? */
1187 if (alg->base.cra_blocksize != 1)
1188 goto out_drop_alg;
1189
1190 err = -ENAMETOOLONG;
1191 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1192 "rfc4543(%s)", alg->base.cra_name) >=
1193 CRYPTO_MAX_ALG_NAME ||
1194 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1195 "rfc4543(%s)", alg->base.cra_driver_name) >=
1196 CRYPTO_MAX_ALG_NAME)
1197 goto out_drop_alg;
1198
1199 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1200 inst->alg.base.cra_priority = alg->base.cra_priority;
1201 inst->alg.base.cra_blocksize = 1;
1202 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1203
1204 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1205
1206 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1207 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1208 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1209
1210 inst->alg.init = crypto_rfc4543_init_tfm;
1211 inst->alg.exit = crypto_rfc4543_exit_tfm;
1212
1213 inst->alg.setkey = crypto_rfc4543_setkey;
1214 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1215 inst->alg.encrypt = crypto_rfc4543_encrypt;
1216 inst->alg.decrypt = crypto_rfc4543_decrypt;
1217
1218 inst->free = crypto_rfc4543_free,
1219
1220 err = aead_register_instance(tmpl, inst);
1221 if (err)
1222 goto out_drop_alg;
1223
1224out:
1225 return err;
1226
1227out_drop_alg:
1228 crypto_drop_aead(spawn);
1229out_free_inst:
1230 kfree(inst);
1231 goto out;
1232}
1233
1234static struct crypto_template crypto_rfc4543_tmpl = {
1235 .name = "rfc4543",
1236 .create = crypto_rfc4543_create,
1237 .module = THIS_MODULE,
1238};
1239
1240static int __init crypto_gcm_module_init(void)
1241{
1242 int err;
1243
1244 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1245 if (!gcm_zeroes)
1246 return -ENOMEM;
1247
1248 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1249
1250 err = crypto_register_template(&crypto_gcm_base_tmpl);
1251 if (err)
1252 goto out;
1253
1254 err = crypto_register_template(&crypto_gcm_tmpl);
1255 if (err)
1256 goto out_undo_base;
1257
1258 err = crypto_register_template(&crypto_rfc4106_tmpl);
1259 if (err)
1260 goto out_undo_gcm;
1261
1262 err = crypto_register_template(&crypto_rfc4543_tmpl);
1263 if (err)
1264 goto out_undo_rfc4106;
1265
1266 return 0;
1267
1268out_undo_rfc4106:
1269 crypto_unregister_template(&crypto_rfc4106_tmpl);
1270out_undo_gcm:
1271 crypto_unregister_template(&crypto_gcm_tmpl);
1272out_undo_base:
1273 crypto_unregister_template(&crypto_gcm_base_tmpl);
1274out:
1275 kfree(gcm_zeroes);
1276 return err;
1277}
1278
1279static void __exit crypto_gcm_module_exit(void)
1280{
1281 kfree(gcm_zeroes);
1282 crypto_unregister_template(&crypto_rfc4543_tmpl);
1283 crypto_unregister_template(&crypto_rfc4106_tmpl);
1284 crypto_unregister_template(&crypto_gcm_tmpl);
1285 crypto_unregister_template(&crypto_gcm_base_tmpl);
1286}
1287
1288module_init(crypto_gcm_module_init);
1289module_exit(crypto_gcm_module_exit);
1290
1291MODULE_LICENSE("GPL");
1292MODULE_DESCRIPTION("Galois/Counter Mode");
1293MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1294MODULE_ALIAS_CRYPTO("gcm_base");
1295MODULE_ALIAS_CRYPTO("rfc4106");
1296MODULE_ALIAS_CRYPTO("rfc4543");
1297MODULE_ALIAS_CRYPTO("gcm");