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