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