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crypto: gcm - fix assumption that assoc has one segment
[deliverable/linux.git] / crypto / gcm.c
CommitLineData
28db8e3e
MH		 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
28db8e3e 11#include <crypto/gf128mul.h>
dadbc53d 12#include <crypto/internal/aead.h>
1472e5eb 13#include <crypto/internal/skcipher.h>
9382d97a 14#include <crypto/internal/hash.h>
42c271c6 15#include <crypto/scatterwalk.h>
9382d97a
HY		 16#include <crypto/hash.h>
17#include "internal.h"
84c91152 18#include <linux/completion.h>
28db8e3e
MH		 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
28db8e3e 25struct gcm_instance_ctx {
1472e5eb 26 struct crypto_skcipher_spawn ctr;
9382d97a 27 struct crypto_ahash_spawn ghash;
28db8e3e
MH		 28};
29
30struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
9382d97a 32 struct crypto_ahash *ghash;
28db8e3e
MH		 33};
34
dadbc53d
HX		 35struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
37 u8 nonce[4];
38};
39
73c89c15
TB		 40struct crypto_rfc4543_ctx {
41 struct crypto_aead *child;
42 u8 nonce[4];
43};
44
45struct crypto_rfc4543_req_ctx {
46 u8 auth_tag[16];
d3dde522 47 u8 assocbuf[32];
73c89c15
TB		 48 struct scatterlist cipher[1];
49 struct scatterlist payload[2];
50 struct scatterlist assoc[2];
51 struct aead_request subreq;
52};
53
28db8e3e 54struct crypto_gcm_ghash_ctx {
9382d97a
HY		 55 unsigned int cryptlen;
56 struct scatterlist *src;
62c5593a 57 void (*complete)(struct aead_request *req, int err);
28db8e3e
MH		 58};
59
60struct crypto_gcm_req_priv_ctx {
61 u8 auth_tag[16];
6160b289 62 u8 iauth_tag[16];
84c91152
HX		 63 struct scatterlist src[2];
64 struct scatterlist dst[2];
9382d97a
HY		 65 struct crypto_gcm_ghash_ctx ghash_ctx;
66 union {
67 struct ahash_request ahreq;
68 struct ablkcipher_request abreq;
69 } u;
28db8e3e
MH		 70};
71
84c91152
HX		 72struct crypto_gcm_setkey_result {
73 int err;
74 struct completion completion;
75};
76
9382d97a
HY		 77static void *gcm_zeroes;
78
2589469d
HX		 79static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
80 struct aead_request *req)
81{
82 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
83
84 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
85}
86
84c91152 87static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
28db8e3e 88{
84c91152 89 struct crypto_gcm_setkey_result *result = req->data;
28db8e3e 90
84c91152
HX		 91 if (err == -EINPROGRESS)
92 return;
93
94 result->err = err;
95 complete(&result->completion);
28db8e3e
MH		 96}
97
98static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
99 unsigned int keylen)
100{
101 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
9382d97a 102 struct crypto_ahash *ghash = ctx->ghash;
28db8e3e 103 struct crypto_ablkcipher *ctr = ctx->ctr;
84c91152
HX		 104 struct {
105 be128 hash;
106 u8 iv[8];
107
108 struct crypto_gcm_setkey_result result;
109
110 struct scatterlist sg[1];
111 struct ablkcipher_request req;
112 } *data;
113 int err;
28db8e3e
MH		 114
115 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
116 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
117 CRYPTO_TFM_REQ_MASK);
118
119 err = crypto_ablkcipher_setkey(ctr, key, keylen);
120 if (err)
84c91152 121 return err;
28db8e3e
MH		 122
123 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
124 CRYPTO_TFM_RES_MASK);
125
84c91152
HX		 126 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
127 GFP_KERNEL);
128 if (!data)
129 return -ENOMEM;
130
131 init_completion(&data->result.completion);
132 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
133 ablkcipher_request_set_tfm(&data->req, ctr);
134 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
135 CRYPTO_TFM_REQ_MAY_BACKLOG,
136 crypto_gcm_setkey_done,
137 &data->result);
138 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
139 sizeof(data->hash), data->iv);
140
141 err = crypto_ablkcipher_encrypt(&data->req);
142 if (err == -EINPROGRESS || err == -EBUSY) {
143 err = wait_for_completion_interruptible(
144 &data->result.completion);
145 if (!err)
146 err = data->result.err;
147 }
148
28db8e3e
MH		 149 if (err)
150 goto out;
151
9382d97a
HY		 152 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
153 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
154 CRYPTO_TFM_REQ_MASK);
155 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
156 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
157 CRYPTO_TFM_RES_MASK);
28db8e3e 158
84c91152
HX		 159out:
160 kfree(data);
28db8e3e
MH		 161 return err;
162}
163
dadbc53d
HX		 164static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
165 unsigned int authsize)
166{
167 switch (authsize) {
168 case 4:
169 case 8:
170 case 12:
171 case 13:
172 case 14:
173 case 15:
174 case 16:
175 break;
176 default:
177 return -EINVAL;
178 }
179
180 return 0;
181}
182
84c91152
HX		 183static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
184 struct aead_request *req,
185 unsigned int cryptlen)
28db8e3e
MH		 186{
187 struct crypto_aead *aead = crypto_aead_reqtfm(req);
188 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
2589469d 189 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152
HX		 190 struct scatterlist *dst;
191 __be32 counter = cpu_to_be32(1);
192
193 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
194 memcpy(req->iv + 12, &counter, 4);
195
196 sg_init_table(pctx->src, 2);
197 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
198 scatterwalk_sg_chain(pctx->src, 2, req->src);
199
200 dst = pctx->src;
201 if (req->src != req->dst) {
202 sg_init_table(pctx->dst, 2);
203 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
204 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
205 dst = pctx->dst;
206 }
28db8e3e
MH		 207
208 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
84c91152
HX		 209 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
210 cryptlen + sizeof(pctx->auth_tag),
211 req->iv);
9382d97a
HY		 212}
213
214static inline unsigned int gcm_remain(unsigned int len)
215{
216 len &= 0xfU;
217 return len ? 16 - len : 0;
218}
219
220static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
221static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
28db8e3e 222
9382d97a
HY		 223static int gcm_hash_update(struct aead_request *req,
224 struct crypto_gcm_req_priv_ctx *pctx,
225 crypto_completion_t complete,
226 struct scatterlist *src,
227 unsigned int len)
228{
229 struct ahash_request *ahreq = &pctx->u.ahreq;
28db8e3e 230
9382d97a
HY		 231 ahash_request_set_callback(ahreq, aead_request_flags(req),
232 complete, req);
233 ahash_request_set_crypt(ahreq, src, NULL, len);
234
235 return crypto_ahash_update(ahreq);
28db8e3e
MH		 236}
237
9382d97a
HY		 238static int gcm_hash_remain(struct aead_request *req,
239 struct crypto_gcm_req_priv_ctx *pctx,
240 unsigned int remain,
241 crypto_completion_t complete)
28db8e3e 242{
9382d97a
HY		 243 struct ahash_request *ahreq = &pctx->u.ahreq;
244
245 ahash_request_set_callback(ahreq, aead_request_flags(req),
246 complete, req);
247 sg_init_one(pctx->src, gcm_zeroes, remain);
248 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
249
250 return crypto_ahash_update(ahreq);
251}
252
253static int gcm_hash_len(struct aead_request *req,
254 struct crypto_gcm_req_priv_ctx *pctx)
255{
256 struct ahash_request *ahreq = &pctx->u.ahreq;
257 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
258 u128 lengths;
259
260 lengths.a = cpu_to_be64(req->assoclen * 8);
261 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
262 memcpy(pctx->iauth_tag, &lengths, 16);
263 sg_init_one(pctx->src, pctx->iauth_tag, 16);
264 ahash_request_set_callback(ahreq, aead_request_flags(req),
265 gcm_hash_len_done, req);
266 ahash_request_set_crypt(ahreq, pctx->src,
267 NULL, sizeof(lengths));
268
269 return crypto_ahash_update(ahreq);
270}
271
272static int gcm_hash_final(struct aead_request *req,
273 struct crypto_gcm_req_priv_ctx *pctx)
274{
275 struct ahash_request *ahreq = &pctx->u.ahreq;
276
277 ahash_request_set_callback(ahreq, aead_request_flags(req),
278 gcm_hash_final_done, req);
279 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
280
281 return crypto_ahash_final(ahreq);
282}
283
62c5593a 284static void __gcm_hash_final_done(struct aead_request *req, int err)
9382d97a 285{
2589469d 286 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 287 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
288
289 if (!err)
290 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
28db8e3e 291
62c5593a 292 gctx->complete(req, err);
9382d97a
HY		 293}
294
62c5593a 295static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 296{
297 struct aead_request *req = areq->data;
62c5593a
HY		 298
299 __gcm_hash_final_done(req, err);
300}
301
302static void __gcm_hash_len_done(struct aead_request *req, int err)
303{
9382d97a
HY		 304 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
305
306 if (!err) {
307 err = gcm_hash_final(req, pctx);
308 if (err == -EINPROGRESS || err == -EBUSY)
309 return;
310 }
311
62c5593a 312 __gcm_hash_final_done(req, err);
9382d97a
HY		 313}
314
62c5593a 315static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 316{
317 struct aead_request *req = areq->data;
62c5593a
HY		 318
319 __gcm_hash_len_done(req, err);
320}
321
322static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
323{
9382d97a
HY		 324 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
325
326 if (!err) {
327 err = gcm_hash_len(req, pctx);
328 if (err == -EINPROGRESS || err == -EBUSY)
329 return;
330 }
331
62c5593a 332 __gcm_hash_len_done(req, err);
9382d97a
HY		 333}
334
62c5593a
HY		 335static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
336 int err)
9382d97a
HY		 337{
338 struct aead_request *req = areq->data;
62c5593a
HY		 339
340 __gcm_hash_crypt_remain_done(req, err);
341}
342
343static void __gcm_hash_crypt_done(struct aead_request *req, int err)
344{
9382d97a
HY		 345 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
346 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
347 unsigned int remain;
348
349 if (!err) {
350 remain = gcm_remain(gctx->cryptlen);
351 BUG_ON(!remain);
352 err = gcm_hash_remain(req, pctx, remain,
353 gcm_hash_crypt_remain_done);
354 if (err == -EINPROGRESS || err == -EBUSY)
355 return;
356 }
357
62c5593a 358 __gcm_hash_crypt_remain_done(req, err);
9382d97a
HY		 359}
360
62c5593a 361static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 362{
363 struct aead_request *req = areq->data;
62c5593a
HY		 364
365 __gcm_hash_crypt_done(req, err);
366}
367
368static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
369{
9382d97a
HY		 370 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
371 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
372 crypto_completion_t complete;
373 unsigned int remain = 0;
374
375 if (!err && gctx->cryptlen) {
376 remain = gcm_remain(gctx->cryptlen);
377 complete = remain ? gcm_hash_crypt_done :
378 gcm_hash_crypt_remain_done;
379 err = gcm_hash_update(req, pctx, complete,
380 gctx->src, gctx->cryptlen);
381 if (err == -EINPROGRESS || err == -EBUSY)
382 return;
383 }
384
385 if (remain)
62c5593a 386 __gcm_hash_crypt_done(req, err);
9382d97a 387 else
62c5593a 388 __gcm_hash_crypt_remain_done(req, err);
9382d97a
HY		 389}
390
62c5593a
HY		 391static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
392 int err)
9382d97a
HY		 393{
394 struct aead_request *req = areq->data;
62c5593a
HY		 395
396 __gcm_hash_assoc_remain_done(req, err);
397}
398
399static void __gcm_hash_assoc_done(struct aead_request *req, int err)
400{
9382d97a
HY		 401 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
402 unsigned int remain;
403
404 if (!err) {
405 remain = gcm_remain(req->assoclen);
406 BUG_ON(!remain);
407 err = gcm_hash_remain(req, pctx, remain,
408 gcm_hash_assoc_remain_done);
409 if (err == -EINPROGRESS || err == -EBUSY)
410 return;
411 }
412
62c5593a 413 __gcm_hash_assoc_remain_done(req, err);
9382d97a
HY		 414}
415
62c5593a 416static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 417{
418 struct aead_request *req = areq->data;
62c5593a
HY		 419
420 __gcm_hash_assoc_done(req, err);
421}
422
423static void __gcm_hash_init_done(struct aead_request *req, int err)
424{
9382d97a
HY		 425 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
426 crypto_completion_t complete;
427 unsigned int remain = 0;
428
429 if (!err && req->assoclen) {
430 remain = gcm_remain(req->assoclen);
431 complete = remain ? gcm_hash_assoc_done :
432 gcm_hash_assoc_remain_done;
433 err = gcm_hash_update(req, pctx, complete,
434 req->assoc, req->assoclen);
435 if (err == -EINPROGRESS || err == -EBUSY)
436 return;
437 }
438
439 if (remain)
62c5593a 440 __gcm_hash_assoc_done(req, err);
9382d97a 441 else
62c5593a
HY		 442 __gcm_hash_assoc_remain_done(req, err);
443}
444
445static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
446{
447 struct aead_request *req = areq->data;
448
449 __gcm_hash_init_done(req, err);
9382d97a
HY		 450}
451
452static int gcm_hash(struct aead_request *req,
453 struct crypto_gcm_req_priv_ctx *pctx)
454{
455 struct ahash_request *ahreq = &pctx->u.ahreq;
456 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
457 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
458 unsigned int remain;
459 crypto_completion_t complete;
460 int err;
461
462 ahash_request_set_tfm(ahreq, ctx->ghash);
463
464 ahash_request_set_callback(ahreq, aead_request_flags(req),
465 gcm_hash_init_done, req);
466 err = crypto_ahash_init(ahreq);
467 if (err)
468 return err;
469 remain = gcm_remain(req->assoclen);
470 complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
471 err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
472 if (err)
473 return err;
474 if (remain) {
475 err = gcm_hash_remain(req, pctx, remain,
476 gcm_hash_assoc_remain_done);
477 if (err)
478 return err;
479 }
480 remain = gcm_remain(gctx->cryptlen);
481 complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
482 err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
483 if (err)
484 return err;
485 if (remain) {
486 err = gcm_hash_remain(req, pctx, remain,
487 gcm_hash_crypt_remain_done);
488 if (err)
489 return err;
490 }
491 err = gcm_hash_len(req, pctx);
492 if (err)
493 return err;
494 err = gcm_hash_final(req, pctx);
495 if (err)
496 return err;
497
498 return 0;
499}
500
501static void gcm_enc_copy_hash(struct aead_request *req,
502 struct crypto_gcm_req_priv_ctx *pctx)
503{
504 struct crypto_aead *aead = crypto_aead_reqtfm(req);
505 u8 *auth_tag = pctx->auth_tag;
28db8e3e 506
6160b289
HX		 507 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
508 crypto_aead_authsize(aead), 1);
6160b289
HX		 509}
510
62c5593a 511static void gcm_enc_hash_done(struct aead_request *req, int err)
6160b289 512{
9382d97a 513 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
6160b289
HX		 514
515 if (!err)
9382d97a 516 gcm_enc_copy_hash(req, pctx);
6160b289 517
28db8e3e
MH		 518 aead_request_complete(req, err);
519}
520
62c5593a 521static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 522{
523 struct aead_request *req = areq->data;
524 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
525
526 if (!err) {
527 err = gcm_hash(req, pctx);
528 if (err == -EINPROGRESS || err == -EBUSY)
529 return;
62c5593a
HY		 530 else if (!err) {
531 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
532 gcm_enc_copy_hash(req, pctx);
533 }
9382d97a
HY		 534 }
535
62c5593a 536 aead_request_complete(req, err);
9382d97a
HY		 537}
538
28db8e3e
MH		 539static int crypto_gcm_encrypt(struct aead_request *req)
540{
2589469d 541 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 542 struct ablkcipher_request *abreq = &pctx->u.abreq;
543 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
84c91152
HX		 544 int err;
545
546 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
547 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
9382d97a
HY		 548 gcm_encrypt_done, req);
549
550 gctx->src = req->dst;
551 gctx->cryptlen = req->cryptlen;
552 gctx->complete = gcm_enc_hash_done;
28db8e3e 553
84c91152 554 err = crypto_ablkcipher_encrypt(abreq);
28db8e3e
MH		 555 if (err)
556 return err;
557
9382d97a
HY		 558 err = gcm_hash(req, pctx);
559 if (err)
560 return err;
561
562 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
563 gcm_enc_copy_hash(req, pctx);
564
565 return 0;
28db8e3e
MH		 566}
567
9382d97a
HY		 568static int crypto_gcm_verify(struct aead_request *req,
569 struct crypto_gcm_req_priv_ctx *pctx)
84c91152
HX		 570{
571 struct crypto_aead *aead = crypto_aead_reqtfm(req);
84c91152
HX		 572 u8 *auth_tag = pctx->auth_tag;
573 u8 *iauth_tag = pctx->iauth_tag;
574 unsigned int authsize = crypto_aead_authsize(aead);
575 unsigned int cryptlen = req->cryptlen - authsize;
576
9382d97a 577 crypto_xor(auth_tag, iauth_tag, 16);
84c91152
HX		 578 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
579 return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
580}
581
9382d97a 582static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
28db8e3e 583{
84c91152 584 struct aead_request *req = areq->data;
9382d97a 585 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152
HX		 586
587 if (!err)
9382d97a 588 err = crypto_gcm_verify(req, pctx);
84c91152
HX		 589
590 aead_request_complete(req, err);
28db8e3e
MH		 591}
592
62c5593a 593static void gcm_dec_hash_done(struct aead_request *req, int err)
9382d97a 594{
9382d97a
HY		 595 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
596 struct ablkcipher_request *abreq = &pctx->u.abreq;
597 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
598
599 if (!err) {
600 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
601 gcm_decrypt_done, req);
602 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
603 err = crypto_ablkcipher_decrypt(abreq);
604 if (err == -EINPROGRESS || err == -EBUSY)
605 return;
62c5593a
HY		 606 else if (!err)
607 err = crypto_gcm_verify(req, pctx);
9382d97a
HY		 608 }
609
62c5593a 610 aead_request_complete(req, err);
9382d97a
HY		 611}
612
28db8e3e
MH		 613static int crypto_gcm_decrypt(struct aead_request *req)
614{
6160b289 615 struct crypto_aead *aead = crypto_aead_reqtfm(req);
2589469d 616 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 617 struct ablkcipher_request *abreq = &pctx->u.abreq;
618 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
6160b289 619 unsigned int authsize = crypto_aead_authsize(aead);
9382d97a 620 unsigned int cryptlen = req->cryptlen;
28db8e3e
MH		 621 int err;
622
6160b289 623 if (cryptlen < authsize)
28db8e3e 624 return -EINVAL;
6160b289 625 cryptlen -= authsize;
28db8e3e 626
9382d97a
HY		 627 gctx->src = req->src;
628 gctx->cryptlen = cryptlen;
629 gctx->complete = gcm_dec_hash_done;
28db8e3e 630
9382d97a
HY		 631 err = gcm_hash(req, pctx);
632 if (err)
633 return err;
28db8e3e 634
9382d97a
HY		 635 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
636 gcm_decrypt_done, req);
637 crypto_gcm_init_crypt(abreq, req, cryptlen);
84c91152
HX		 638 err = crypto_ablkcipher_decrypt(abreq);
639 if (err)
640 return err;
28db8e3e 641
9382d97a 642 return crypto_gcm_verify(req, pctx);
28db8e3e
MH		 643}
644
645static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
646{
647 struct crypto_instance *inst = (void *)tfm->__crt_alg;
648 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
649 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
650 struct crypto_ablkcipher *ctr;
9382d97a 651 struct crypto_ahash *ghash;
28db8e3e
MH		 652 unsigned long align;
653 int err;
654
9382d97a
HY		 655 ghash = crypto_spawn_ahash(&ictx->ghash);
656 if (IS_ERR(ghash))
657 return PTR_ERR(ghash);
658
1472e5eb 659 ctr = crypto_spawn_skcipher(&ictx->ctr);
28db8e3e
MH		 660 err = PTR_ERR(ctr);
661 if (IS_ERR(ctr))
9382d97a 662 goto err_free_hash;
28db8e3e
MH		 663
664 ctx->ctr = ctr;
9382d97a 665 ctx->ghash = ghash;
28db8e3e 666
2589469d 667 align = crypto_tfm_alg_alignmask(tfm);
28db8e3e 668 align &= ~(crypto_tfm_ctx_alignment() - 1);
7f681378 669 tfm->crt_aead.reqsize = align +
9382d97a
HY		 670 offsetof(struct crypto_gcm_req_priv_ctx, u) +
671 max(sizeof(struct ablkcipher_request) +
672 crypto_ablkcipher_reqsize(ctr),
673 sizeof(struct ahash_request) +
674 crypto_ahash_reqsize(ghash));
28db8e3e
MH		 675
676 return 0;
9382d97a
HY		 677
678err_free_hash:
679 crypto_free_ahash(ghash);
680 return err;
28db8e3e
MH		 681}
682
683static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
684{
685 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
686
9382d97a 687 crypto_free_ahash(ctx->ghash);
28db8e3e
MH		 688 crypto_free_ablkcipher(ctx->ctr);
689}
690
d00aa19b
HX		 691static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
692 const char *full_name,
9382d97a
HY		 693 const char *ctr_name,
694 const char *ghash_name)
28db8e3e 695{
d00aa19b 696 struct crypto_attr_type *algt;
28db8e3e
MH		 697 struct crypto_instance *inst;
698 struct crypto_alg *ctr;
9382d97a
HY		 699 struct crypto_alg *ghash_alg;
700 struct ahash_alg *ghash_ahash_alg;
28db8e3e
MH		 701 struct gcm_instance_ctx *ctx;
702 int err;
28db8e3e 703
d00aa19b 704 algt = crypto_get_attr_type(tb);
d00aa19b 705 if (IS_ERR(algt))
3e8afe35 706 return ERR_CAST(algt);
28db8e3e 707
d00aa19b
HX		 708 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
709 return ERR_PTR(-EINVAL);
28db8e3e 710
9382d97a
HY		 711 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
712 CRYPTO_ALG_TYPE_HASH,
713 CRYPTO_ALG_TYPE_AHASH_MASK);
9382d97a 714 if (IS_ERR(ghash_alg))
3e8afe35 715 return ERR_CAST(ghash_alg);
9382d97a
HY		 716
717 err = -ENOMEM;
1472e5eb
HX		 718 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
719 if (!inst)
9382d97a 720 goto out_put_ghash;
28db8e3e 721
1472e5eb 722 ctx = crypto_instance_ctx(inst);
9382d97a
HY		 723 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
724 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
725 inst);
726 if (err)
727 goto err_free_inst;
728
1472e5eb
HX		 729 crypto_set_skcipher_spawn(&ctx->ctr, inst);
730 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
731 crypto_requires_sync(algt->type,
732 algt->mask));
733 if (err)
9382d97a 734 goto err_drop_ghash;
1472e5eb
HX		 735
736 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
28db8e3e 737
d00aa19b 738 /* We only support 16-byte blocks. */
1472e5eb 739 if (ctr->cra_ablkcipher.ivsize != 16)
d00aa19b
HX		 740 goto out_put_ctr;
741
742 /* Not a stream cipher? */
743 err = -EINVAL;
744 if (ctr->cra_blocksize != 1)
28db8e3e
MH		 745 goto out_put_ctr;
746
28db8e3e 747 err = -ENAMETOOLONG;
d00aa19b 748 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
9382d97a
HY		 749 "gcm_base(%s,%s)", ctr->cra_driver_name,
750 ghash_alg->cra_driver_name) >=
d00aa19b 751 CRYPTO_MAX_ALG_NAME)
1472e5eb 752 goto out_put_ctr;
28db8e3e 753
d00aa19b
HX		 754 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
755
1472e5eb
HX		 756 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
757 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
28db8e3e 758 inst->alg.cra_priority = ctr->cra_priority;
d00aa19b 759 inst->alg.cra_blocksize = 1;
2589469d 760 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
28db8e3e 761 inst->alg.cra_type = &crypto_aead_type;
84c91152 762 inst->alg.cra_aead.ivsize = 16;
7ba683a6 763 inst->alg.cra_aead.maxauthsize = 16;
28db8e3e
MH		 764 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
765 inst->alg.cra_init = crypto_gcm_init_tfm;
766 inst->alg.cra_exit = crypto_gcm_exit_tfm;
767 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
dadbc53d 768 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
28db8e3e
MH		 769 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
770 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
771
772out:
9382d97a 773 crypto_mod_put(ghash_alg);
28db8e3e 774 return inst;
1472e5eb
HX		 775
776out_put_ctr:
777 crypto_drop_skcipher(&ctx->ctr);
9382d97a
HY		 778err_drop_ghash:
779 crypto_drop_ahash(&ctx->ghash);
28db8e3e
MH		 780err_free_inst:
781 kfree(inst);
9382d97a 782out_put_ghash:
28db8e3e
MH		 783 inst = ERR_PTR(err);
784 goto out;
785}
786
d00aa19b
HX		 787static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
788{
d00aa19b
HX		 789 const char *cipher_name;
790 char ctr_name[CRYPTO_MAX_ALG_NAME];
791 char full_name[CRYPTO_MAX_ALG_NAME];
792
793 cipher_name = crypto_attr_alg_name(tb[1]);
d00aa19b 794 if (IS_ERR(cipher_name))
3e8afe35 795 return ERR_CAST(cipher_name);
d00aa19b
HX		 796
797 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
798 CRYPTO_MAX_ALG_NAME)
799 return ERR_PTR(-ENAMETOOLONG);
800
801 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
802 CRYPTO_MAX_ALG_NAME)
803 return ERR_PTR(-ENAMETOOLONG);
804
9382d97a 805 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
d00aa19b
HX		 806}
807
28db8e3e
MH		 808static void crypto_gcm_free(struct crypto_instance *inst)
809{
810 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
811
1472e5eb 812 crypto_drop_skcipher(&ctx->ctr);
9382d97a 813 crypto_drop_ahash(&ctx->ghash);
28db8e3e
MH		 814 kfree(inst);
815}
816
817static struct crypto_template crypto_gcm_tmpl = {
818 .name = "gcm",
819 .alloc = crypto_gcm_alloc,
820 .free = crypto_gcm_free,
821 .module = THIS_MODULE,
822};
823
d00aa19b
HX		 824static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
825{
d00aa19b 826 const char *ctr_name;
9382d97a 827 const char *ghash_name;
d00aa19b
HX		 828 char full_name[CRYPTO_MAX_ALG_NAME];
829
830 ctr_name = crypto_attr_alg_name(tb[1]);
d00aa19b 831 if (IS_ERR(ctr_name))
3e8afe35 832 return ERR_CAST(ctr_name);
d00aa19b 833
9382d97a 834 ghash_name = crypto_attr_alg_name(tb[2]);
9382d97a 835 if (IS_ERR(ghash_name))
3e8afe35 836 return ERR_CAST(ghash_name);
9382d97a
HY		 837
838 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
839 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
d00aa19b
HX		 840 return ERR_PTR(-ENAMETOOLONG);
841
9382d97a 842 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
d00aa19b
HX		 843}
844
845static struct crypto_template crypto_gcm_base_tmpl = {
846 .name = "gcm_base",
847 .alloc = crypto_gcm_base_alloc,
848 .free = crypto_gcm_free,
849 .module = THIS_MODULE,
850};
851
dadbc53d
HX		 852static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
853 unsigned int keylen)
854{
855 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
856 struct crypto_aead *child = ctx->child;
857 int err;
858
859 if (keylen < 4)
860 return -EINVAL;
861
862 keylen -= 4;
863 memcpy(ctx->nonce, key + keylen, 4);
864
865 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
866 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
867 CRYPTO_TFM_REQ_MASK);
868 err = crypto_aead_setkey(child, key, keylen);
869 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
870 CRYPTO_TFM_RES_MASK);
871
872 return err;
873}
874
875static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
876 unsigned int authsize)
877{
878 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
879
880 switch (authsize) {
881 case 8:
882 case 12:
883 case 16:
884 break;
885 default:
886 return -EINVAL;
887 }
888
889 return crypto_aead_setauthsize(ctx->child, authsize);
890}
891
892static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
893{
894 struct aead_request *subreq = aead_request_ctx(req);
895 struct crypto_aead *aead = crypto_aead_reqtfm(req);
896 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
897 struct crypto_aead *child = ctx->child;
898 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
899 crypto_aead_alignmask(child) + 1);
900
901 memcpy(iv, ctx->nonce, 4);
902 memcpy(iv + 4, req->iv, 8);
903
904 aead_request_set_tfm(subreq, child);
905 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
906 req->base.data);
907 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
908 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
909
910 return subreq;
911}
912
913static int crypto_rfc4106_encrypt(struct aead_request *req)
914{
915 req = crypto_rfc4106_crypt(req);
916
917 return crypto_aead_encrypt(req);
918}
919
920static int crypto_rfc4106_decrypt(struct aead_request *req)
921{
922 req = crypto_rfc4106_crypt(req);
923
924 return crypto_aead_decrypt(req);
925}
926
927static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
928{
929 struct crypto_instance *inst = (void *)tfm->__crt_alg;
930 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
931 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
932 struct crypto_aead *aead;
933 unsigned long align;
934
935 aead = crypto_spawn_aead(spawn);
936 if (IS_ERR(aead))
937 return PTR_ERR(aead);
938
939 ctx->child = aead;
940
941 align = crypto_aead_alignmask(aead);
942 align &= ~(crypto_tfm_ctx_alignment() - 1);
943 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
944 ALIGN(crypto_aead_reqsize(aead),
945 crypto_tfm_ctx_alignment()) +
946 align + 16;
947
948 return 0;
949}
950
951static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
952{
953 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
954
955 crypto_free_aead(ctx->child);
956}
957
958static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
959{
960 struct crypto_attr_type *algt;
961 struct crypto_instance *inst;
962 struct crypto_aead_spawn *spawn;
963 struct crypto_alg *alg;
964 const char *ccm_name;
965 int err;
966
967 algt = crypto_get_attr_type(tb);
dadbc53d 968 if (IS_ERR(algt))
3e8afe35 969 return ERR_CAST(algt);
dadbc53d
HX		 970
971 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
972 return ERR_PTR(-EINVAL);
973
974 ccm_name = crypto_attr_alg_name(tb[1]);
dadbc53d 975 if (IS_ERR(ccm_name))
3e8afe35 976 return ERR_CAST(ccm_name);
dadbc53d
HX		 977
978 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
979 if (!inst)
980 return ERR_PTR(-ENOMEM);
981
982 spawn = crypto_instance_ctx(inst);
983 crypto_set_aead_spawn(spawn, inst);
984 err = crypto_grab_aead(spawn, ccm_name, 0,
985 crypto_requires_sync(algt->type, algt->mask));
986 if (err)
987 goto out_free_inst;
988
989 alg = crypto_aead_spawn_alg(spawn);
990
991 err = -EINVAL;
992
993 /* We only support 16-byte blocks. */
994 if (alg->cra_aead.ivsize != 16)
995 goto out_drop_alg;
996
997 /* Not a stream cipher? */
998 if (alg->cra_blocksize != 1)
999 goto out_drop_alg;
1000
1001 err = -ENAMETOOLONG;
1002 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1003 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1004 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1005 "rfc4106(%s)", alg->cra_driver_name) >=
1006 CRYPTO_MAX_ALG_NAME)
1007 goto out_drop_alg;
1008
1009 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1010 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1011 inst->alg.cra_priority = alg->cra_priority;
1012 inst->alg.cra_blocksize = 1;
1013 inst->alg.cra_alignmask = alg->cra_alignmask;
1014 inst->alg.cra_type = &crypto_nivaead_type;
1015
1016 inst->alg.cra_aead.ivsize = 8;
1017 inst->alg.cra_aead.maxauthsize = 16;
1018
1019 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1020
1021 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1022 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1023
1024 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1025 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1026 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1027 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1028
1029 inst->alg.cra_aead.geniv = "seqiv";
1030
1031out:
1032 return inst;
1033
1034out_drop_alg:
1035 crypto_drop_aead(spawn);
1036out_free_inst:
1037 kfree(inst);
1038 inst = ERR_PTR(err);
1039 goto out;
1040}
1041
1042static void crypto_rfc4106_free(struct crypto_instance *inst)
1043{
1044 crypto_drop_spawn(crypto_instance_ctx(inst));
1045 kfree(inst);
1046}
1047
1048static struct crypto_template crypto_rfc4106_tmpl = {
1049 .name = "rfc4106",
1050 .alloc = crypto_rfc4106_alloc,
1051 .free = crypto_rfc4106_free,
1052 .module = THIS_MODULE,
1053};
1054
73c89c15
TB		 1055static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1056 struct aead_request *req)
1057{
1058 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1059
1060 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1061}
1062
1063static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1064 unsigned int keylen)
1065{
1066 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1067 struct crypto_aead *child = ctx->child;
1068 int err;
1069
1070 if (keylen < 4)
1071 return -EINVAL;
1072
1073 keylen -= 4;
1074 memcpy(ctx->nonce, key + keylen, 4);
1075
1076 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1077 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1078 CRYPTO_TFM_REQ_MASK);
1079 err = crypto_aead_setkey(child, key, keylen);
1080 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1081 CRYPTO_TFM_RES_MASK);
1082
1083 return err;
1084}
1085
1086static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1087 unsigned int authsize)
1088{
1089 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1090
1091 if (authsize != 16)
1092 return -EINVAL;
1093
1094 return crypto_aead_setauthsize(ctx->child, authsize);
1095}
1096
73c89c15
TB		 1097static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1098 int enc)
1099{
1100 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1101 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1102 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1103 struct aead_request *subreq = &rctx->subreq;
1104 struct scatterlist *dst = req->dst;
1105 struct scatterlist *cipher = rctx->cipher;
1106 struct scatterlist *payload = rctx->payload;
1107 struct scatterlist *assoc = rctx->assoc;
1108 unsigned int authsize = crypto_aead_authsize(aead);
1109 unsigned int assoclen = req->assoclen;
1110 struct page *dstp;
1111 u8 *vdst;
1112 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1113 crypto_aead_alignmask(ctx->child) + 1);
1114
1115 memcpy(iv, ctx->nonce, 4);
1116 memcpy(iv + 4, req->iv, 8);
1117
1118 /* construct cipher/plaintext */
1119 if (enc)
1120 memset(rctx->auth_tag, 0, authsize);
1121 else
1122 scatterwalk_map_and_copy(rctx->auth_tag, dst,
1123 req->cryptlen - authsize,
1124 authsize, 0);
1125
1126 sg_init_one(cipher, rctx->auth_tag, authsize);
1127
1128 /* construct the aad */
1129 dstp = sg_page(dst);
1130 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1131
1132 sg_init_table(payload, 2);
1133 sg_set_buf(payload, req->iv, 8);
c920fa60 1134 scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
73c89c15
TB		 1135 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1136
d3dde522
JK		 1137 if (req->assoc->length == req->assoclen) {
1138 sg_init_table(assoc, 2);
1139 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1140 req->assoc->offset);
1141 } else {
1142 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1143
1144 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1145 req->assoclen, 0);
1146
1147 sg_init_table(assoc, 2);
1148 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1149 }
c920fa60 1150 scatterwalk_crypto_chain(assoc, payload, 0, 2);
73c89c15
TB		 1151
1152 aead_request_set_tfm(subreq, ctx->child);
1153 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1154 req->base.data);
1155 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1156 aead_request_set_assoc(subreq, assoc, assoclen);
1157
1158 return subreq;
1159}
1160
1161static int crypto_rfc4543_encrypt(struct aead_request *req)
1162{
1163 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1164 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1165 struct aead_request *subreq;
1166 int err;
1167
1168 subreq = crypto_rfc4543_crypt(req, 1);
1169 err = crypto_aead_encrypt(subreq);
1170 if (err)
1171 return err;
1172
1173 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1174 crypto_aead_authsize(aead), 1);
1175
1176 return 0;
1177}
1178
1179static int crypto_rfc4543_decrypt(struct aead_request *req)
1180{
1181 req = crypto_rfc4543_crypt(req, 0);
1182
1183 return crypto_aead_decrypt(req);
1184}
1185
1186static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1187{
1188 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1189 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1190 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1191 struct crypto_aead *aead;
1192 unsigned long align;
1193
1194 aead = crypto_spawn_aead(spawn);
1195 if (IS_ERR(aead))
1196 return PTR_ERR(aead);
1197
1198 ctx->child = aead;
1199
1200 align = crypto_aead_alignmask(aead);
1201 align &= ~(crypto_tfm_ctx_alignment() - 1);
1202 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1203 ALIGN(crypto_aead_reqsize(aead),
1204 crypto_tfm_ctx_alignment()) +
1205 align + 16;
1206
1207 return 0;
1208}
1209
1210static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1211{
1212 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1213
1214 crypto_free_aead(ctx->child);
1215}
1216
1217static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1218{
1219 struct crypto_attr_type *algt;
1220 struct crypto_instance *inst;
1221 struct crypto_aead_spawn *spawn;
1222 struct crypto_alg *alg;
1223 const char *ccm_name;
1224 int err;
1225
1226 algt = crypto_get_attr_type(tb);
73c89c15 1227 if (IS_ERR(algt))
3e8afe35 1228 return ERR_CAST(algt);
73c89c15
TB		 1229
1230 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1231 return ERR_PTR(-EINVAL);
1232
1233 ccm_name = crypto_attr_alg_name(tb[1]);
73c89c15 1234 if (IS_ERR(ccm_name))
3e8afe35 1235 return ERR_CAST(ccm_name);
73c89c15
TB		 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
1290out:
1291 return inst;
1292
1293out_drop_alg:
1294 crypto_drop_aead(spawn);
1295out_free_inst:
1296 kfree(inst);
1297 inst = ERR_PTR(err);
1298 goto out;
1299}
1300
1301static void crypto_rfc4543_free(struct crypto_instance *inst)
1302{
1303 crypto_drop_spawn(crypto_instance_ctx(inst));
1304 kfree(inst);
1305}
1306
1307static 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
28db8e3e
MH		 1314static int __init crypto_gcm_module_init(void)
1315{
d00aa19b
HX		 1316 int err;
1317
9382d97a
HY		 1318 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1319 if (!gcm_zeroes)
1320 return -ENOMEM;
1321
d00aa19b
HX		 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
dadbc53d
HX		 1330 err = crypto_register_template(&crypto_rfc4106_tmpl);
1331 if (err)
1332 goto out_undo_gcm;
1333
73c89c15
TB		 1334 err = crypto_register_template(&crypto_rfc4543_tmpl);
1335 if (err)
1336 goto out_undo_rfc4106;
1337
9382d97a 1338 return 0;
d00aa19b 1339
73c89c15
TB		 1340out_undo_rfc4106:
1341 crypto_unregister_template(&crypto_rfc4106_tmpl);
dadbc53d
HX		 1342out_undo_gcm:
1343 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b
HX		 1344out_undo_base:
1345 crypto_unregister_template(&crypto_gcm_base_tmpl);
9382d97a
HY		 1346out:
1347 kfree(gcm_zeroes);
1348 return err;
28db8e3e
MH		 1349}
1350
1351static void __exit crypto_gcm_module_exit(void)
1352{
9382d97a 1353 kfree(gcm_zeroes);
73c89c15 1354 crypto_unregister_template(&crypto_rfc4543_tmpl);
dadbc53d 1355 crypto_unregister_template(&crypto_rfc4106_tmpl);
28db8e3e 1356 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b 1357 crypto_unregister_template(&crypto_gcm_base_tmpl);
28db8e3e
MH		 1358}
1359
1360module_init(crypto_gcm_module_init);
1361module_exit(crypto_gcm_module_exit);
1362
1363MODULE_LICENSE("GPL");
1364MODULE_DESCRIPTION("Galois/Counter Mode");
1365MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
d00aa19b 1366MODULE_ALIAS("gcm_base");
dadbc53d 1367MODULE_ALIAS("rfc4106");
73c89c15 1368MODULE_ALIAS("rfc4543");
Linux kernel - Deliverables
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