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