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 wait_for_completion(&data->result.completion);
150 err = data->result.err;
151 }
152
153 if (err)
154 goto out;
155
156 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
157 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
158 CRYPTO_TFM_REQ_MASK);
159 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
160 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
161 CRYPTO_TFM_RES_MASK);
162
163 out:
164 kfree(data);
165 return err;
166 }
167
crypto_gcm_setauthsize(struct crypto_aead * tfm,unsigned int authsize)168 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
169 unsigned int authsize)
170 {
171 switch (authsize) {
172 case 4:
173 case 8:
174 case 12:
175 case 13:
176 case 14:
177 case 15:
178 case 16:
179 break;
180 default:
181 return -EINVAL;
182 }
183
184 return 0;
185 }
186
crypto_gcm_init_crypt(struct ablkcipher_request * ablk_req,struct aead_request * req,unsigned int cryptlen)187 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
188 struct aead_request *req,
189 unsigned int cryptlen)
190 {
191 struct crypto_aead *aead = crypto_aead_reqtfm(req);
192 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
193 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
194 struct scatterlist *dst;
195 __be32 counter = cpu_to_be32(1);
196
197 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
198 memcpy(req->iv + 12, &counter, 4);
199
200 sg_init_table(pctx->src, 2);
201 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
202 scatterwalk_sg_chain(pctx->src, 2, req->src);
203
204 dst = pctx->src;
205 if (req->src != req->dst) {
206 sg_init_table(pctx->dst, 2);
207 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
208 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
209 dst = pctx->dst;
210 }
211
212 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
213 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
214 cryptlen + sizeof(pctx->auth_tag),
215 req->iv);
216 }
217
gcm_remain(unsigned int len)218 static inline unsigned int gcm_remain(unsigned int len)
219 {
220 len &= 0xfU;
221 return len ? 16 - len : 0;
222 }
223
224 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
225 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
226
gcm_hash_update(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx,crypto_completion_t compl,struct scatterlist * src,unsigned int len)227 static int gcm_hash_update(struct aead_request *req,
228 struct crypto_gcm_req_priv_ctx *pctx,
229 crypto_completion_t compl,
230 struct scatterlist *src,
231 unsigned int len)
232 {
233 struct ahash_request *ahreq = &pctx->u.ahreq;
234
235 ahash_request_set_callback(ahreq, aead_request_flags(req),
236 compl, req);
237 ahash_request_set_crypt(ahreq, src, NULL, len);
238
239 return crypto_ahash_update(ahreq);
240 }
241
gcm_hash_remain(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx,unsigned int remain,crypto_completion_t compl)242 static int gcm_hash_remain(struct aead_request *req,
243 struct crypto_gcm_req_priv_ctx *pctx,
244 unsigned int remain,
245 crypto_completion_t compl)
246 {
247 struct ahash_request *ahreq = &pctx->u.ahreq;
248
249 ahash_request_set_callback(ahreq, aead_request_flags(req),
250 compl, req);
251 sg_init_one(pctx->src, gcm_zeroes, remain);
252 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
253
254 return crypto_ahash_update(ahreq);
255 }
256
gcm_hash_len(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx)257 static int gcm_hash_len(struct aead_request *req,
258 struct crypto_gcm_req_priv_ctx *pctx)
259 {
260 struct ahash_request *ahreq = &pctx->u.ahreq;
261 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
262 u128 lengths;
263
264 lengths.a = cpu_to_be64(req->assoclen * 8);
265 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
266 memcpy(pctx->iauth_tag, &lengths, 16);
267 sg_init_one(pctx->src, pctx->iauth_tag, 16);
268 ahash_request_set_callback(ahreq, aead_request_flags(req),
269 gcm_hash_len_done, req);
270 ahash_request_set_crypt(ahreq, pctx->src,
271 NULL, sizeof(lengths));
272
273 return crypto_ahash_update(ahreq);
274 }
275
gcm_hash_final(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx)276 static int gcm_hash_final(struct aead_request *req,
277 struct crypto_gcm_req_priv_ctx *pctx)
278 {
279 struct ahash_request *ahreq = &pctx->u.ahreq;
280
281 ahash_request_set_callback(ahreq, aead_request_flags(req),
282 gcm_hash_final_done, req);
283 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
284
285 return crypto_ahash_final(ahreq);
286 }
287
__gcm_hash_final_done(struct aead_request * req,int err)288 static void __gcm_hash_final_done(struct aead_request *req, int err)
289 {
290 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
291 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
292
293 if (!err)
294 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
295
296 gctx->complete(req, err);
297 }
298
gcm_hash_final_done(struct crypto_async_request * areq,int err)299 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
300 {
301 struct aead_request *req = areq->data;
302
303 __gcm_hash_final_done(req, err);
304 }
305
__gcm_hash_len_done(struct aead_request * req,int err)306 static void __gcm_hash_len_done(struct aead_request *req, int err)
307 {
308 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
309
310 if (!err) {
311 err = gcm_hash_final(req, pctx);
312 if (err == -EINPROGRESS || err == -EBUSY)
313 return;
314 }
315
316 __gcm_hash_final_done(req, err);
317 }
318
gcm_hash_len_done(struct crypto_async_request * areq,int err)319 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
320 {
321 struct aead_request *req = areq->data;
322
323 __gcm_hash_len_done(req, err);
324 }
325
__gcm_hash_crypt_remain_done(struct aead_request * req,int err)326 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
327 {
328 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
329
330 if (!err) {
331 err = gcm_hash_len(req, pctx);
332 if (err == -EINPROGRESS || err == -EBUSY)
333 return;
334 }
335
336 __gcm_hash_len_done(req, err);
337 }
338
gcm_hash_crypt_remain_done(struct crypto_async_request * areq,int err)339 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
340 int err)
341 {
342 struct aead_request *req = areq->data;
343
344 __gcm_hash_crypt_remain_done(req, err);
345 }
346
__gcm_hash_crypt_done(struct aead_request * req,int err)347 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
348 {
349 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
350 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
351 unsigned int remain;
352
353 if (!err) {
354 remain = gcm_remain(gctx->cryptlen);
355 BUG_ON(!remain);
356 err = gcm_hash_remain(req, pctx, remain,
357 gcm_hash_crypt_remain_done);
358 if (err == -EINPROGRESS || err == -EBUSY)
359 return;
360 }
361
362 __gcm_hash_crypt_remain_done(req, err);
363 }
364
gcm_hash_crypt_done(struct crypto_async_request * areq,int err)365 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
366 {
367 struct aead_request *req = areq->data;
368
369 __gcm_hash_crypt_done(req, err);
370 }
371
__gcm_hash_assoc_remain_done(struct aead_request * req,int err)372 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
373 {
374 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
375 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
376 crypto_completion_t compl;
377 unsigned int remain = 0;
378
379 if (!err && gctx->cryptlen) {
380 remain = gcm_remain(gctx->cryptlen);
381 compl = remain ? gcm_hash_crypt_done :
382 gcm_hash_crypt_remain_done;
383 err = gcm_hash_update(req, pctx, compl,
384 gctx->src, gctx->cryptlen);
385 if (err == -EINPROGRESS || err == -EBUSY)
386 return;
387 }
388
389 if (remain)
390 __gcm_hash_crypt_done(req, err);
391 else
392 __gcm_hash_crypt_remain_done(req, err);
393 }
394
gcm_hash_assoc_remain_done(struct crypto_async_request * areq,int err)395 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
396 int err)
397 {
398 struct aead_request *req = areq->data;
399
400 __gcm_hash_assoc_remain_done(req, err);
401 }
402
__gcm_hash_assoc_done(struct aead_request * req,int err)403 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
404 {
405 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
406 unsigned int remain;
407
408 if (!err) {
409 remain = gcm_remain(req->assoclen);
410 BUG_ON(!remain);
411 err = gcm_hash_remain(req, pctx, remain,
412 gcm_hash_assoc_remain_done);
413 if (err == -EINPROGRESS || err == -EBUSY)
414 return;
415 }
416
417 __gcm_hash_assoc_remain_done(req, err);
418 }
419
gcm_hash_assoc_done(struct crypto_async_request * areq,int err)420 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
421 {
422 struct aead_request *req = areq->data;
423
424 __gcm_hash_assoc_done(req, err);
425 }
426
__gcm_hash_init_done(struct aead_request * req,int err)427 static void __gcm_hash_init_done(struct aead_request *req, int err)
428 {
429 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
430 crypto_completion_t compl;
431 unsigned int remain = 0;
432
433 if (!err && req->assoclen) {
434 remain = gcm_remain(req->assoclen);
435 compl = remain ? gcm_hash_assoc_done :
436 gcm_hash_assoc_remain_done;
437 err = gcm_hash_update(req, pctx, compl,
438 req->assoc, req->assoclen);
439 if (err == -EINPROGRESS || err == -EBUSY)
440 return;
441 }
442
443 if (remain)
444 __gcm_hash_assoc_done(req, err);
445 else
446 __gcm_hash_assoc_remain_done(req, err);
447 }
448
gcm_hash_init_done(struct crypto_async_request * areq,int err)449 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
450 {
451 struct aead_request *req = areq->data;
452
453 __gcm_hash_init_done(req, err);
454 }
455
gcm_hash(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx)456 static int gcm_hash(struct aead_request *req,
457 struct crypto_gcm_req_priv_ctx *pctx)
458 {
459 struct ahash_request *ahreq = &pctx->u.ahreq;
460 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
461 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
462 unsigned int remain;
463 crypto_completion_t compl;
464 int err;
465
466 ahash_request_set_tfm(ahreq, ctx->ghash);
467
468 ahash_request_set_callback(ahreq, aead_request_flags(req),
469 gcm_hash_init_done, req);
470 err = crypto_ahash_init(ahreq);
471 if (err)
472 return err;
473 remain = gcm_remain(req->assoclen);
474 compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
475 err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
476 if (err)
477 return err;
478 if (remain) {
479 err = gcm_hash_remain(req, pctx, remain,
480 gcm_hash_assoc_remain_done);
481 if (err)
482 return err;
483 }
484 remain = gcm_remain(gctx->cryptlen);
485 compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
486 err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
487 if (err)
488 return err;
489 if (remain) {
490 err = gcm_hash_remain(req, pctx, remain,
491 gcm_hash_crypt_remain_done);
492 if (err)
493 return err;
494 }
495 err = gcm_hash_len(req, pctx);
496 if (err)
497 return err;
498 err = gcm_hash_final(req, pctx);
499 if (err)
500 return err;
501
502 return 0;
503 }
504
gcm_enc_copy_hash(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx)505 static void gcm_enc_copy_hash(struct aead_request *req,
506 struct crypto_gcm_req_priv_ctx *pctx)
507 {
508 struct crypto_aead *aead = crypto_aead_reqtfm(req);
509 u8 *auth_tag = pctx->auth_tag;
510
511 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
512 crypto_aead_authsize(aead), 1);
513 }
514
gcm_enc_hash_done(struct aead_request * req,int err)515 static void gcm_enc_hash_done(struct aead_request *req, int err)
516 {
517 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
518
519 if (!err)
520 gcm_enc_copy_hash(req, pctx);
521
522 aead_request_complete(req, err);
523 }
524
gcm_encrypt_done(struct crypto_async_request * areq,int err)525 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
526 {
527 struct aead_request *req = areq->data;
528 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
529
530 if (!err) {
531 err = gcm_hash(req, pctx);
532 if (err == -EINPROGRESS || err == -EBUSY)
533 return;
534 else if (!err) {
535 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
536 gcm_enc_copy_hash(req, pctx);
537 }
538 }
539
540 aead_request_complete(req, err);
541 }
542
crypto_gcm_encrypt(struct aead_request * req)543 static int crypto_gcm_encrypt(struct aead_request *req)
544 {
545 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
546 struct ablkcipher_request *abreq = &pctx->u.abreq;
547 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
548 int err;
549
550 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
551 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
552 gcm_encrypt_done, req);
553
554 gctx->src = req->dst;
555 gctx->cryptlen = req->cryptlen;
556 gctx->complete = gcm_enc_hash_done;
557
558 err = crypto_ablkcipher_encrypt(abreq);
559 if (err)
560 return err;
561
562 err = gcm_hash(req, pctx);
563 if (err)
564 return err;
565
566 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
567 gcm_enc_copy_hash(req, pctx);
568
569 return 0;
570 }
571
crypto_gcm_verify(struct aead_request * req,struct crypto_gcm_req_priv_ctx * pctx)572 static int crypto_gcm_verify(struct aead_request *req,
573 struct crypto_gcm_req_priv_ctx *pctx)
574 {
575 struct crypto_aead *aead = crypto_aead_reqtfm(req);
576 u8 *auth_tag = pctx->auth_tag;
577 u8 *iauth_tag = pctx->iauth_tag;
578 unsigned int authsize = crypto_aead_authsize(aead);
579 unsigned int cryptlen = req->cryptlen - authsize;
580
581 crypto_xor(auth_tag, iauth_tag, 16);
582 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
583 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
584 }
585
gcm_decrypt_done(struct crypto_async_request * areq,int err)586 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
587 {
588 struct aead_request *req = areq->data;
589 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
590
591 if (!err)
592 err = crypto_gcm_verify(req, pctx);
593
594 aead_request_complete(req, err);
595 }
596
gcm_dec_hash_done(struct aead_request * req,int err)597 static void gcm_dec_hash_done(struct aead_request *req, int err)
598 {
599 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
600 struct ablkcipher_request *abreq = &pctx->u.abreq;
601 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
602
603 if (!err) {
604 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
605 gcm_decrypt_done, req);
606 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
607 err = crypto_ablkcipher_decrypt(abreq);
608 if (err == -EINPROGRESS || err == -EBUSY)
609 return;
610 else if (!err)
611 err = crypto_gcm_verify(req, pctx);
612 }
613
614 aead_request_complete(req, err);
615 }
616
crypto_gcm_decrypt(struct aead_request * req)617 static int crypto_gcm_decrypt(struct aead_request *req)
618 {
619 struct crypto_aead *aead = crypto_aead_reqtfm(req);
620 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
621 struct ablkcipher_request *abreq = &pctx->u.abreq;
622 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
623 unsigned int authsize = crypto_aead_authsize(aead);
624 unsigned int cryptlen = req->cryptlen;
625 int err;
626
627 if (cryptlen < authsize)
628 return -EINVAL;
629 cryptlen -= authsize;
630
631 gctx->src = req->src;
632 gctx->cryptlen = cryptlen;
633 gctx->complete = gcm_dec_hash_done;
634
635 err = gcm_hash(req, pctx);
636 if (err)
637 return err;
638
639 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
640 gcm_decrypt_done, req);
641 crypto_gcm_init_crypt(abreq, req, cryptlen);
642 err = crypto_ablkcipher_decrypt(abreq);
643 if (err)
644 return err;
645
646 return crypto_gcm_verify(req, pctx);
647 }
648
crypto_gcm_init_tfm(struct crypto_tfm * tfm)649 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
650 {
651 struct crypto_instance *inst = (void *)tfm->__crt_alg;
652 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
653 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
654 struct crypto_ablkcipher *ctr;
655 struct crypto_ahash *ghash;
656 unsigned long align;
657 int err;
658
659 ghash = crypto_spawn_ahash(&ictx->ghash);
660 if (IS_ERR(ghash))
661 return PTR_ERR(ghash);
662
663 ctr = crypto_spawn_skcipher(&ictx->ctr);
664 err = PTR_ERR(ctr);
665 if (IS_ERR(ctr))
666 goto err_free_hash;
667
668 ctx->ctr = ctr;
669 ctx->ghash = ghash;
670
671 align = crypto_tfm_alg_alignmask(tfm);
672 align &= ~(crypto_tfm_ctx_alignment() - 1);
673 tfm->crt_aead.reqsize = align +
674 offsetof(struct crypto_gcm_req_priv_ctx, u) +
675 max(sizeof(struct ablkcipher_request) +
676 crypto_ablkcipher_reqsize(ctr),
677 sizeof(struct ahash_request) +
678 crypto_ahash_reqsize(ghash));
679
680 return 0;
681
682 err_free_hash:
683 crypto_free_ahash(ghash);
684 return err;
685 }
686
crypto_gcm_exit_tfm(struct crypto_tfm * tfm)687 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
688 {
689 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
690
691 crypto_free_ahash(ctx->ghash);
692 crypto_free_ablkcipher(ctx->ctr);
693 }
694
crypto_gcm_alloc_common(struct rtattr ** tb,const char * full_name,const char * ctr_name,const char * ghash_name)695 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
696 const char *full_name,
697 const char *ctr_name,
698 const char *ghash_name)
699 {
700 struct crypto_attr_type *algt;
701 struct crypto_instance *inst;
702 struct crypto_alg *ctr;
703 struct crypto_alg *ghash_alg;
704 struct ahash_alg *ghash_ahash_alg;
705 struct gcm_instance_ctx *ctx;
706 int err;
707
708 algt = crypto_get_attr_type(tb);
709 if (IS_ERR(algt))
710 return ERR_CAST(algt);
711
712 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
713 return ERR_PTR(-EINVAL);
714
715 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
716 CRYPTO_ALG_TYPE_HASH,
717 CRYPTO_ALG_TYPE_AHASH_MASK |
718 crypto_requires_sync(algt->type,
719 algt->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_CRYPTO("gcm_base");
1445 MODULE_ALIAS_CRYPTO("rfc4106");
1446 MODULE_ALIAS_CRYPTO("rfc4543");
1447 MODULE_ALIAS_CRYPTO("gcm");
1448