Merge remote-tracking branch 'mailbox/mailbox-for-next'
[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>
17db8546 15#include <crypto/null.h>
42c271c6 16#include <crypto/scatterwalk.h>
9382d97a
HY
17#include <crypto/hash.h>
18#include "internal.h"
84c91152 19#include <linux/completion.h>
28db8e3e
MH
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25
28db8e3e 26struct gcm_instance_ctx {
1472e5eb 27 struct crypto_skcipher_spawn ctr;
9382d97a 28 struct crypto_ahash_spawn ghash;
28db8e3e
MH
29};
30
31struct crypto_gcm_ctx {
16f37ecd 32 struct crypto_skcipher *ctr;
9382d97a 33 struct crypto_ahash *ghash;
28db8e3e
MH
34};
35
dadbc53d
HX
36struct crypto_rfc4106_ctx {
37 struct crypto_aead *child;
38 u8 nonce[4];
39};
40
7b05a373
HX
41struct crypto_rfc4106_req_ctx {
42 struct scatterlist src[3];
43 struct scatterlist dst[3];
44 struct aead_request subreq;
45};
46
9489667d
JK
47struct crypto_rfc4543_instance_ctx {
48 struct crypto_aead_spawn aead;
9489667d
JK
49};
50
73c89c15
TB
51struct crypto_rfc4543_ctx {
52 struct crypto_aead *child;
16f37ecd 53 struct crypto_skcipher *null;
73c89c15
TB
54 u8 nonce[4];
55};
56
57struct crypto_rfc4543_req_ctx {
73c89c15
TB
58 struct aead_request subreq;
59};
60
28db8e3e 61struct crypto_gcm_ghash_ctx {
9382d97a
HY
62 unsigned int cryptlen;
63 struct scatterlist *src;
adcbc688 64 int (*complete)(struct aead_request *req, u32 flags);
28db8e3e
MH
65};
66
67struct crypto_gcm_req_priv_ctx {
adcbc688 68 u8 iv[16];
28db8e3e 69 u8 auth_tag[16];
6160b289 70 u8 iauth_tag[16];
adcbc688
HX
71 struct scatterlist src[3];
72 struct scatterlist dst[3];
73 struct scatterlist sg;
9382d97a
HY
74 struct crypto_gcm_ghash_ctx ghash_ctx;
75 union {
76 struct ahash_request ahreq;
16f37ecd 77 struct skcipher_request skreq;
9382d97a 78 } u;
28db8e3e
MH
79};
80
84c91152
HX
81struct crypto_gcm_setkey_result {
82 int err;
83 struct completion completion;
84};
85
adcbc688
HX
86static struct {
87 u8 buf[16];
88 struct scatterlist sg;
89} *gcm_zeroes;
90
91static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
9382d97a 92
2589469d
HX
93static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
94 struct aead_request *req)
95{
96 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
97
98 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
99}
100
84c91152 101static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
28db8e3e 102{
84c91152 103 struct crypto_gcm_setkey_result *result = req->data;
28db8e3e 104
84c91152
HX
105 if (err == -EINPROGRESS)
106 return;
107
108 result->err = err;
109 complete(&result->completion);
28db8e3e
MH
110}
111
112static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
113 unsigned int keylen)
114{
115 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
9382d97a 116 struct crypto_ahash *ghash = ctx->ghash;
16f37ecd 117 struct crypto_skcipher *ctr = ctx->ctr;
84c91152
HX
118 struct {
119 be128 hash;
120 u8 iv[8];
121
122 struct crypto_gcm_setkey_result result;
123
124 struct scatterlist sg[1];
16f37ecd 125 struct skcipher_request req;
84c91152
HX
126 } *data;
127 int err;
28db8e3e 128
16f37ecd
HX
129 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
130 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
131 CRYPTO_TFM_REQ_MASK);
132 err = crypto_skcipher_setkey(ctr, key, keylen);
133 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
adcbc688 134 CRYPTO_TFM_RES_MASK);
28db8e3e 135 if (err)
84c91152 136 return err;
28db8e3e 137
16f37ecd 138 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
84c91152
HX
139 GFP_KERNEL);
140 if (!data)
141 return -ENOMEM;
142
143 init_completion(&data->result.completion);
144 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
16f37ecd
HX
145 skcipher_request_set_tfm(&data->req, ctr);
146 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
147 CRYPTO_TFM_REQ_MAY_BACKLOG,
148 crypto_gcm_setkey_done,
149 &data->result);
150 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
151 sizeof(data->hash), data->iv);
152
153 err = crypto_skcipher_encrypt(&data->req);
84c91152
HX
154 if (err == -EINPROGRESS || err == -EBUSY) {
155 err = wait_for_completion_interruptible(
156 &data->result.completion);
157 if (!err)
158 err = data->result.err;
159 }
160
28db8e3e
MH
161 if (err)
162 goto out;
163
9382d97a
HY
164 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
165 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
166 CRYPTO_TFM_REQ_MASK);
167 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
168 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
169 CRYPTO_TFM_RES_MASK);
28db8e3e 170
84c91152 171out:
adcbc688 172 kzfree(data);
28db8e3e
MH
173 return err;
174}
175
dadbc53d
HX
176static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
177 unsigned int authsize)
178{
179 switch (authsize) {
180 case 4:
181 case 8:
182 case 12:
183 case 13:
184 case 14:
185 case 15:
186 case 16:
187 break;
188 default:
189 return -EINVAL;
190 }
191
192 return 0;
193}
194
adcbc688 195static void crypto_gcm_init_common(struct aead_request *req)
28db8e3e 196{
2589469d 197 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152 198 __be32 counter = cpu_to_be32(1);
adcbc688 199 struct scatterlist *sg;
84c91152
HX
200
201 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
adcbc688
HX
202 memcpy(pctx->iv, req->iv, 12);
203 memcpy(pctx->iv + 12, &counter, 4);
84c91152 204
adcbc688 205 sg_init_table(pctx->src, 3);
84c91152 206 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
adcbc688
HX
207 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
208 if (sg != pctx->src + 1)
c56f6d12 209 sg_chain(pctx->src, 2, sg);
84c91152 210
84c91152 211 if (req->src != req->dst) {
adcbc688 212 sg_init_table(pctx->dst, 3);
84c91152 213 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
adcbc688
HX
214 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
215 if (sg != pctx->dst + 1)
c56f6d12 216 sg_chain(pctx->dst, 2, sg);
84c91152 217 }
adcbc688
HX
218}
219
220static void crypto_gcm_init_crypt(struct aead_request *req,
221 unsigned int cryptlen)
222{
223 struct crypto_aead *aead = crypto_aead_reqtfm(req);
224 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
225 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
16f37ecd 226 struct skcipher_request *skreq = &pctx->u.skreq;
adcbc688
HX
227 struct scatterlist *dst;
228
229 dst = req->src == req->dst ? pctx->src : pctx->dst;
28db8e3e 230
16f37ecd
HX
231 skcipher_request_set_tfm(skreq, ctx->ctr);
232 skcipher_request_set_crypt(skreq, pctx->src, dst,
84c91152 233 cryptlen + sizeof(pctx->auth_tag),
adcbc688 234 pctx->iv);
9382d97a
HY
235}
236
237static inline unsigned int gcm_remain(unsigned int len)
238{
239 len &= 0xfU;
240 return len ? 16 - len : 0;
241}
242
243static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
28db8e3e 244
9382d97a 245static int gcm_hash_update(struct aead_request *req,
3e3dc25f 246 crypto_completion_t compl,
9382d97a 247 struct scatterlist *src,
adcbc688 248 unsigned int len, u32 flags)
9382d97a 249{
adcbc688 250 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a 251 struct ahash_request *ahreq = &pctx->u.ahreq;
28db8e3e 252
adcbc688 253 ahash_request_set_callback(ahreq, flags, compl, req);
9382d97a
HY
254 ahash_request_set_crypt(ahreq, src, NULL, len);
255
256 return crypto_ahash_update(ahreq);
28db8e3e
MH
257}
258
9382d97a 259static int gcm_hash_remain(struct aead_request *req,
9382d97a 260 unsigned int remain,
adcbc688 261 crypto_completion_t compl, u32 flags)
28db8e3e 262{
adcbc688 263 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
9382d97a
HY
264}
265
adcbc688 266static int gcm_hash_len(struct aead_request *req, u32 flags)
9382d97a 267{
adcbc688 268 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY
269 struct ahash_request *ahreq = &pctx->u.ahreq;
270 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
271 u128 lengths;
272
273 lengths.a = cpu_to_be64(req->assoclen * 8);
274 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
275 memcpy(pctx->iauth_tag, &lengths, 16);
adcbc688
HX
276 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
277 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
278 ahash_request_set_crypt(ahreq, &pctx->sg,
279 pctx->iauth_tag, sizeof(lengths));
9382d97a 280
adcbc688 281 return crypto_ahash_finup(ahreq);
9382d97a
HY
282}
283
adcbc688 284static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
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
adcbc688 289 return gctx->complete(req, flags);
9382d97a
HY
290}
291
adcbc688 292static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
9382d97a
HY
293{
294 struct aead_request *req = areq->data;
62c5593a 295
adcbc688
HX
296 if (err)
297 goto out;
9382d97a 298
adcbc688
HX
299 err = gcm_hash_len_continue(req, 0);
300 if (err == -EINPROGRESS)
301 return;
62c5593a 302
adcbc688
HX
303out:
304 aead_request_complete(req, err);
62c5593a
HY
305}
306
adcbc688 307static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
62c5593a 308{
adcbc688
HX
309 return gcm_hash_len(req, flags) ?:
310 gcm_hash_len_continue(req, flags);
9382d97a
HY
311}
312
62c5593a
HY
313static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
314 int err)
9382d97a
HY
315{
316 struct aead_request *req = areq->data;
62c5593a 317
adcbc688
HX
318 if (err)
319 goto out;
320
321 err = gcm_hash_crypt_remain_continue(req, 0);
322 if (err == -EINPROGRESS)
323 return;
324
325out:
326 aead_request_complete(req, err);
62c5593a
HY
327}
328
adcbc688 329static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
62c5593a 330{
9382d97a
HY
331 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
332 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
333 unsigned int remain;
334
adcbc688
HX
335 remain = gcm_remain(gctx->cryptlen);
336 if (remain)
337 return gcm_hash_remain(req, remain,
338 gcm_hash_crypt_remain_done, flags) ?:
339 gcm_hash_crypt_remain_continue(req, flags);
9382d97a 340
adcbc688 341 return gcm_hash_crypt_remain_continue(req, flags);
9382d97a
HY
342}
343
62c5593a 344static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY
345{
346 struct aead_request *req = areq->data;
62c5593a 347
adcbc688
HX
348 if (err)
349 goto out;
350
351 err = gcm_hash_crypt_continue(req, 0);
352 if (err == -EINPROGRESS)
353 return;
354
355out:
356 aead_request_complete(req, err);
62c5593a
HY
357}
358
adcbc688 359static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
62c5593a 360{
9382d97a
HY
361 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
362 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
9382d97a 363
adcbc688
HX
364 if (gctx->cryptlen)
365 return gcm_hash_update(req, gcm_hash_crypt_done,
366 gctx->src, gctx->cryptlen, flags) ?:
367 gcm_hash_crypt_continue(req, flags);
368
369 return gcm_hash_crypt_remain_continue(req, flags);
9382d97a
HY
370}
371
62c5593a
HY
372static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
373 int err)
9382d97a
HY
374{
375 struct aead_request *req = areq->data;
62c5593a 376
adcbc688
HX
377 if (err)
378 goto out;
379
380 err = gcm_hash_assoc_remain_continue(req, 0);
381 if (err == -EINPROGRESS)
382 return;
383
384out:
385 aead_request_complete(req, err);
62c5593a
HY
386}
387
adcbc688 388static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
62c5593a 389{
9382d97a
HY
390 unsigned int remain;
391
adcbc688
HX
392 remain = gcm_remain(req->assoclen);
393 if (remain)
394 return gcm_hash_remain(req, remain,
395 gcm_hash_assoc_remain_done, flags) ?:
396 gcm_hash_assoc_remain_continue(req, flags);
9382d97a 397
adcbc688 398 return gcm_hash_assoc_remain_continue(req, flags);
9382d97a
HY
399}
400
62c5593a 401static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
9382d97a
HY
402{
403 struct aead_request *req = areq->data;
62c5593a 404
adcbc688
HX
405 if (err)
406 goto out;
407
408 err = gcm_hash_assoc_continue(req, 0);
409 if (err == -EINPROGRESS)
410 return;
411
412out:
413 aead_request_complete(req, err);
62c5593a
HY
414}
415
adcbc688 416static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
62c5593a 417{
adcbc688
HX
418 if (req->assoclen)
419 return gcm_hash_update(req, gcm_hash_assoc_done,
420 req->src, req->assoclen, flags) ?:
421 gcm_hash_assoc_continue(req, flags);
9382d97a 422
adcbc688 423 return gcm_hash_assoc_remain_continue(req, flags);
62c5593a
HY
424}
425
426static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
427{
428 struct aead_request *req = areq->data;
429
adcbc688
HX
430 if (err)
431 goto out;
432
433 err = gcm_hash_init_continue(req, 0);
434 if (err == -EINPROGRESS)
435 return;
436
437out:
438 aead_request_complete(req, err);
9382d97a
HY
439}
440
adcbc688 441static int gcm_hash(struct aead_request *req, u32 flags)
9382d97a 442{
adcbc688 443 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a 444 struct ahash_request *ahreq = &pctx->u.ahreq;
adcbc688 445 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
9382d97a
HY
446
447 ahash_request_set_tfm(ahreq, ctx->ghash);
448
adcbc688
HX
449 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
450 return crypto_ahash_init(ahreq) ?:
451 gcm_hash_init_continue(req, flags);
9382d97a
HY
452}
453
adcbc688 454static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
9382d97a 455{
adcbc688 456 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY
457 struct crypto_aead *aead = crypto_aead_reqtfm(req);
458 u8 *auth_tag = pctx->auth_tag;
28db8e3e 459
adcbc688
HX
460 crypto_xor(auth_tag, pctx->iauth_tag, 16);
461 scatterwalk_map_and_copy(auth_tag, req->dst,
462 req->assoclen + req->cryptlen,
6160b289 463 crypto_aead_authsize(aead), 1);
adcbc688 464 return 0;
6160b289
HX
465}
466
adcbc688 467static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
6160b289 468{
9382d97a 469 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
adcbc688 470 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
6160b289 471
adcbc688
HX
472 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
473 gctx->cryptlen = req->cryptlen;
474 gctx->complete = gcm_enc_copy_hash;
6160b289 475
adcbc688 476 return gcm_hash(req, flags);
28db8e3e
MH
477}
478
62c5593a 479static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY
480{
481 struct aead_request *req = areq->data;
9382d97a 482
adcbc688
HX
483 if (err)
484 goto out;
485
486 err = gcm_encrypt_continue(req, 0);
487 if (err == -EINPROGRESS)
488 return;
9382d97a 489
adcbc688 490out:
62c5593a 491 aead_request_complete(req, err);
9382d97a
HY
492}
493
28db8e3e
MH
494static int crypto_gcm_encrypt(struct aead_request *req)
495{
2589469d 496 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
16f37ecd 497 struct skcipher_request *skreq = &pctx->u.skreq;
adcbc688 498 u32 flags = aead_request_flags(req);
9382d97a 499
adcbc688
HX
500 crypto_gcm_init_common(req);
501 crypto_gcm_init_crypt(req, req->cryptlen);
16f37ecd 502 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
9382d97a 503
16f37ecd 504 return crypto_skcipher_encrypt(skreq) ?:
adcbc688 505 gcm_encrypt_continue(req, flags);
28db8e3e
MH
506}
507
adcbc688 508static int crypto_gcm_verify(struct aead_request *req)
84c91152 509{
adcbc688 510 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152 511 struct crypto_aead *aead = crypto_aead_reqtfm(req);
84c91152
HX
512 u8 *auth_tag = pctx->auth_tag;
513 u8 *iauth_tag = pctx->iauth_tag;
514 unsigned int authsize = crypto_aead_authsize(aead);
515 unsigned int cryptlen = req->cryptlen - authsize;
516
9382d97a 517 crypto_xor(auth_tag, iauth_tag, 16);
adcbc688
HX
518 scatterwalk_map_and_copy(iauth_tag, req->src,
519 req->assoclen + cryptlen, authsize, 0);
6bf37e5a 520 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
84c91152
HX
521}
522
9382d97a 523static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
28db8e3e 524{
84c91152
HX
525 struct aead_request *req = areq->data;
526
527 if (!err)
adcbc688 528 err = crypto_gcm_verify(req);
84c91152
HX
529
530 aead_request_complete(req, err);
28db8e3e
MH
531}
532
adcbc688 533static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
9382d97a 534{
9382d97a 535 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
16f37ecd 536 struct skcipher_request *skreq = &pctx->u.skreq;
9382d97a
HY
537 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
538
adcbc688 539 crypto_gcm_init_crypt(req, gctx->cryptlen);
16f37ecd
HX
540 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
541 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
9382d97a
HY
542}
543
28db8e3e
MH
544static int crypto_gcm_decrypt(struct aead_request *req)
545{
6160b289 546 struct crypto_aead *aead = crypto_aead_reqtfm(req);
2589469d 547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a 548 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
6160b289 549 unsigned int authsize = crypto_aead_authsize(aead);
9382d97a 550 unsigned int cryptlen = req->cryptlen;
adcbc688 551 u32 flags = aead_request_flags(req);
28db8e3e 552
6160b289 553 cryptlen -= authsize;
28db8e3e 554
adcbc688 555 crypto_gcm_init_common(req);
28db8e3e 556
adcbc688
HX
557 gctx->src = sg_next(pctx->src);
558 gctx->cryptlen = cryptlen;
559 gctx->complete = gcm_dec_hash_continue;
28db8e3e 560
adcbc688 561 return gcm_hash(req, flags);
28db8e3e
MH
562}
563
adcbc688 564static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
28db8e3e 565{
adcbc688
HX
566 struct aead_instance *inst = aead_alg_instance(tfm);
567 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
568 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
16f37ecd 569 struct crypto_skcipher *ctr;
9382d97a 570 struct crypto_ahash *ghash;
28db8e3e
MH
571 unsigned long align;
572 int err;
573
9382d97a
HY
574 ghash = crypto_spawn_ahash(&ictx->ghash);
575 if (IS_ERR(ghash))
576 return PTR_ERR(ghash);
577
16f37ecd 578 ctr = crypto_spawn_skcipher2(&ictx->ctr);
28db8e3e
MH
579 err = PTR_ERR(ctr);
580 if (IS_ERR(ctr))
9382d97a 581 goto err_free_hash;
28db8e3e
MH
582
583 ctx->ctr = ctr;
9382d97a 584 ctx->ghash = ghash;
28db8e3e 585
adcbc688 586 align = crypto_aead_alignmask(tfm);
28db8e3e 587 align &= ~(crypto_tfm_ctx_alignment() - 1);
adcbc688 588 crypto_aead_set_reqsize(tfm,
5d72336f 589 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
16f37ecd
HX
590 max(sizeof(struct skcipher_request) +
591 crypto_skcipher_reqsize(ctr),
9382d97a 592 sizeof(struct ahash_request) +
5d72336f 593 crypto_ahash_reqsize(ghash)));
28db8e3e
MH
594
595 return 0;
9382d97a
HY
596
597err_free_hash:
598 crypto_free_ahash(ghash);
599 return err;
28db8e3e
MH
600}
601
adcbc688 602static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
28db8e3e 603{
adcbc688 604 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
28db8e3e 605
9382d97a 606 crypto_free_ahash(ctx->ghash);
16f37ecd 607 crypto_free_skcipher(ctx->ctr);
28db8e3e
MH
608}
609
7b05a373
HX
610static void crypto_gcm_free(struct aead_instance *inst)
611{
612 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
613
614 crypto_drop_skcipher(&ctx->ctr);
615 crypto_drop_ahash(&ctx->ghash);
616 kfree(inst);
617}
618
adcbc688
HX
619static int crypto_gcm_create_common(struct crypto_template *tmpl,
620 struct rtattr **tb,
621 const char *full_name,
622 const char *ctr_name,
623 const char *ghash_name)
28db8e3e 624{
d00aa19b 625 struct crypto_attr_type *algt;
adcbc688 626 struct aead_instance *inst;
16f37ecd 627 struct skcipher_alg *ctr;
9382d97a 628 struct crypto_alg *ghash_alg;
adcbc688 629 struct hash_alg_common *ghash;
28db8e3e
MH
630 struct gcm_instance_ctx *ctx;
631 int err;
28db8e3e 632
d00aa19b 633 algt = crypto_get_attr_type(tb);
d00aa19b 634 if (IS_ERR(algt))
adcbc688 635 return PTR_ERR(algt);
28db8e3e 636
5e4b8c1f 637 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
adcbc688 638 return -EINVAL;
28db8e3e 639
9382d97a
HY
640 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
641 CRYPTO_ALG_TYPE_HASH,
b30bdfa8
HX
642 CRYPTO_ALG_TYPE_AHASH_MASK |
643 crypto_requires_sync(algt->type,
644 algt->mask));
9382d97a 645 if (IS_ERR(ghash_alg))
adcbc688
HX
646 return PTR_ERR(ghash_alg);
647
648 ghash = __crypto_hash_alg_common(ghash_alg);
9382d97a
HY
649
650 err = -ENOMEM;
1472e5eb
HX
651 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
652 if (!inst)
9382d97a 653 goto out_put_ghash;
28db8e3e 654
adcbc688
HX
655 ctx = aead_instance_ctx(inst);
656 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
657 aead_crypto_instance(inst));
9382d97a
HY
658 if (err)
659 goto err_free_inst;
660
adcbc688
HX
661 err = -EINVAL;
662 if (ghash->digestsize != 16)
663 goto err_drop_ghash;
664
665 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
16f37ecd
HX
666 err = crypto_grab_skcipher2(&ctx->ctr, ctr_name, 0,
667 crypto_requires_sync(algt->type,
668 algt->mask));
1472e5eb 669 if (err)
9382d97a 670 goto err_drop_ghash;
1472e5eb 671
16f37ecd 672 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
28db8e3e 673
d00aa19b 674 /* We only support 16-byte blocks. */
16f37ecd 675 if (crypto_skcipher_alg_ivsize(ctr) != 16)
d00aa19b
HX
676 goto out_put_ctr;
677
678 /* Not a stream cipher? */
679 err = -EINVAL;
16f37ecd 680 if (ctr->base.cra_blocksize != 1)
28db8e3e
MH
681 goto out_put_ctr;
682
28db8e3e 683 err = -ENAMETOOLONG;
adcbc688 684 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
16f37ecd 685 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
9382d97a 686 ghash_alg->cra_driver_name) >=
d00aa19b 687 CRYPTO_MAX_ALG_NAME)
1472e5eb 688 goto out_put_ctr;
28db8e3e 689
adcbc688
HX
690 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
691
16f37ecd
HX
692 inst->alg.base.cra_flags = (ghash->base.cra_flags |
693 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
adcbc688 694 inst->alg.base.cra_priority = (ghash->base.cra_priority +
16f37ecd 695 ctr->base.cra_priority) / 2;
adcbc688
HX
696 inst->alg.base.cra_blocksize = 1;
697 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
16f37ecd 698 ctr->base.cra_alignmask;
adcbc688
HX
699 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
700 inst->alg.ivsize = 12;
16f37ecd 701 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
adcbc688
HX
702 inst->alg.maxauthsize = 16;
703 inst->alg.init = crypto_gcm_init_tfm;
704 inst->alg.exit = crypto_gcm_exit_tfm;
705 inst->alg.setkey = crypto_gcm_setkey;
706 inst->alg.setauthsize = crypto_gcm_setauthsize;
707 inst->alg.encrypt = crypto_gcm_encrypt;
708 inst->alg.decrypt = crypto_gcm_decrypt;
709
7b05a373
HX
710 inst->free = crypto_gcm_free;
711
adcbc688
HX
712 err = aead_register_instance(tmpl, inst);
713 if (err)
714 goto out_put_ctr;
28db8e3e 715
adcbc688 716out_put_ghash:
9382d97a 717 crypto_mod_put(ghash_alg);
adcbc688 718 return err;
1472e5eb
HX
719
720out_put_ctr:
721 crypto_drop_skcipher(&ctx->ctr);
9382d97a
HY
722err_drop_ghash:
723 crypto_drop_ahash(&ctx->ghash);
28db8e3e
MH
724err_free_inst:
725 kfree(inst);
adcbc688 726 goto out_put_ghash;
28db8e3e
MH
727}
728
adcbc688 729static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
d00aa19b 730{
d00aa19b
HX
731 const char *cipher_name;
732 char ctr_name[CRYPTO_MAX_ALG_NAME];
733 char full_name[CRYPTO_MAX_ALG_NAME];
734
735 cipher_name = crypto_attr_alg_name(tb[1]);
d00aa19b 736 if (IS_ERR(cipher_name))
adcbc688 737 return PTR_ERR(cipher_name);
d00aa19b
HX
738
739 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
740 CRYPTO_MAX_ALG_NAME)
adcbc688 741 return -ENAMETOOLONG;
d00aa19b
HX
742
743 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
744 CRYPTO_MAX_ALG_NAME)
adcbc688 745 return -ENAMETOOLONG;
d00aa19b 746
adcbc688
HX
747 return crypto_gcm_create_common(tmpl, tb, full_name,
748 ctr_name, "ghash");
d00aa19b
HX
749}
750
28db8e3e
MH
751static struct crypto_template crypto_gcm_tmpl = {
752 .name = "gcm",
adcbc688 753 .create = crypto_gcm_create,
28db8e3e
MH
754 .module = THIS_MODULE,
755};
756
adcbc688
HX
757static int crypto_gcm_base_create(struct crypto_template *tmpl,
758 struct rtattr **tb)
d00aa19b 759{
d00aa19b 760 const char *ctr_name;
9382d97a 761 const char *ghash_name;
d00aa19b
HX
762 char full_name[CRYPTO_MAX_ALG_NAME];
763
764 ctr_name = crypto_attr_alg_name(tb[1]);
d00aa19b 765 if (IS_ERR(ctr_name))
adcbc688 766 return PTR_ERR(ctr_name);
d00aa19b 767
9382d97a 768 ghash_name = crypto_attr_alg_name(tb[2]);
9382d97a 769 if (IS_ERR(ghash_name))
adcbc688 770 return PTR_ERR(ghash_name);
9382d97a
HY
771
772 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
773 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
adcbc688 774 return -ENAMETOOLONG;
d00aa19b 775
adcbc688
HX
776 return crypto_gcm_create_common(tmpl, tb, full_name,
777 ctr_name, ghash_name);
d00aa19b
HX
778}
779
780static struct crypto_template crypto_gcm_base_tmpl = {
781 .name = "gcm_base",
adcbc688 782 .create = crypto_gcm_base_create,
d00aa19b
HX
783 .module = THIS_MODULE,
784};
785
dadbc53d
HX
786static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
787 unsigned int keylen)
788{
789 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
790 struct crypto_aead *child = ctx->child;
791 int err;
792
793 if (keylen < 4)
794 return -EINVAL;
795
796 keylen -= 4;
797 memcpy(ctx->nonce, key + keylen, 4);
798
799 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
800 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
801 CRYPTO_TFM_REQ_MASK);
802 err = crypto_aead_setkey(child, key, keylen);
803 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
804 CRYPTO_TFM_RES_MASK);
805
806 return err;
807}
808
809static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
810 unsigned int authsize)
811{
812 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
813
814 switch (authsize) {
815 case 8:
816 case 12:
817 case 16:
818 break;
819 default:
820 return -EINVAL;
821 }
822
823 return crypto_aead_setauthsize(ctx->child, authsize);
824}
825
826static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
827{
7b05a373 828 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
dadbc53d
HX
829 struct crypto_aead *aead = crypto_aead_reqtfm(req);
830 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
7b05a373 831 struct aead_request *subreq = &rctx->subreq;
dadbc53d 832 struct crypto_aead *child = ctx->child;
7b05a373 833 struct scatterlist *sg;
dadbc53d
HX
834 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
835 crypto_aead_alignmask(child) + 1);
836
7b05a373
HX
837 scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
838
dadbc53d
HX
839 memcpy(iv, ctx->nonce, 4);
840 memcpy(iv + 4, req->iv, 8);
841
7b05a373
HX
842 sg_init_table(rctx->src, 3);
843 sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
844 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
845 if (sg != rctx->src + 1)
846 sg_chain(rctx->src, 2, sg);
847
848 if (req->src != req->dst) {
849 sg_init_table(rctx->dst, 3);
850 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
851 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
852 if (sg != rctx->dst + 1)
853 sg_chain(rctx->dst, 2, sg);
854 }
855
dadbc53d
HX
856 aead_request_set_tfm(subreq, child);
857 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
858 req->base.data);
7b05a373
HX
859 aead_request_set_crypt(subreq, rctx->src,
860 req->src == req->dst ? rctx->src : rctx->dst,
861 req->cryptlen, iv);
862 aead_request_set_ad(subreq, req->assoclen - 8);
dadbc53d
HX
863
864 return subreq;
865}
866
867static int crypto_rfc4106_encrypt(struct aead_request *req)
868{
7b05a373
HX
869 if (req->assoclen != 16 && req->assoclen != 20)
870 return -EINVAL;
871
dadbc53d
HX
872 req = crypto_rfc4106_crypt(req);
873
874 return crypto_aead_encrypt(req);
875}
876
877static int crypto_rfc4106_decrypt(struct aead_request *req)
878{
7b05a373
HX
879 if (req->assoclen != 16 && req->assoclen != 20)
880 return -EINVAL;
881
dadbc53d
HX
882 req = crypto_rfc4106_crypt(req);
883
884 return crypto_aead_decrypt(req);
885}
886
adcbc688 887static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
dadbc53d 888{
adcbc688
HX
889 struct aead_instance *inst = aead_alg_instance(tfm);
890 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
891 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
dadbc53d
HX
892 struct crypto_aead *aead;
893 unsigned long align;
894
895 aead = crypto_spawn_aead(spawn);
896 if (IS_ERR(aead))
897 return PTR_ERR(aead);
898
899 ctx->child = aead;
900
901 align = crypto_aead_alignmask(aead);
902 align &= ~(crypto_tfm_ctx_alignment() - 1);
adcbc688
HX
903 crypto_aead_set_reqsize(
904 tfm,
7b05a373 905 sizeof(struct crypto_rfc4106_req_ctx) +
5d72336f 906 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
7b05a373 907 align + 24);
dadbc53d
HX
908
909 return 0;
910}
911
adcbc688 912static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
dadbc53d 913{
adcbc688 914 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
dadbc53d
HX
915
916 crypto_free_aead(ctx->child);
917}
918
7b05a373
HX
919static void crypto_rfc4106_free(struct aead_instance *inst)
920{
921 crypto_drop_aead(aead_instance_ctx(inst));
922 kfree(inst);
923}
924
adcbc688
HX
925static int crypto_rfc4106_create(struct crypto_template *tmpl,
926 struct rtattr **tb)
dadbc53d
HX
927{
928 struct crypto_attr_type *algt;
adcbc688 929 struct aead_instance *inst;
dadbc53d 930 struct crypto_aead_spawn *spawn;
adcbc688 931 struct aead_alg *alg;
dadbc53d
HX
932 const char *ccm_name;
933 int err;
934
935 algt = crypto_get_attr_type(tb);
dadbc53d 936 if (IS_ERR(algt))
adcbc688 937 return PTR_ERR(algt);
dadbc53d 938
5e4b8c1f 939 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
adcbc688 940 return -EINVAL;
dadbc53d
HX
941
942 ccm_name = crypto_attr_alg_name(tb[1]);
dadbc53d 943 if (IS_ERR(ccm_name))
adcbc688 944 return PTR_ERR(ccm_name);
dadbc53d
HX
945
946 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
947 if (!inst)
adcbc688 948 return -ENOMEM;
dadbc53d 949
adcbc688
HX
950 spawn = aead_instance_ctx(inst);
951 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
dadbc53d
HX
952 err = crypto_grab_aead(spawn, ccm_name, 0,
953 crypto_requires_sync(algt->type, algt->mask));
954 if (err)
955 goto out_free_inst;
956
adcbc688 957 alg = crypto_spawn_aead_alg(spawn);
dadbc53d
HX
958
959 err = -EINVAL;
960
adcbc688
HX
961 /* Underlying IV size must be 12. */
962 if (crypto_aead_alg_ivsize(alg) != 12)
dadbc53d
HX
963 goto out_drop_alg;
964
965 /* Not a stream cipher? */
adcbc688 966 if (alg->base.cra_blocksize != 1)
dadbc53d
HX
967 goto out_drop_alg;
968
969 err = -ENAMETOOLONG;
adcbc688
HX
970 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
971 "rfc4106(%s)", alg->base.cra_name) >=
972 CRYPTO_MAX_ALG_NAME ||
973 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
974 "rfc4106(%s)", alg->base.cra_driver_name) >=
dadbc53d
HX
975 CRYPTO_MAX_ALG_NAME)
976 goto out_drop_alg;
977
7b05a373 978 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
adcbc688
HX
979 inst->alg.base.cra_priority = alg->base.cra_priority;
980 inst->alg.base.cra_blocksize = 1;
981 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
dadbc53d 982
adcbc688 983 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
dadbc53d 984
adcbc688 985 inst->alg.ivsize = 8;
16f37ecd 986 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
adcbc688 987 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
dadbc53d 988
adcbc688
HX
989 inst->alg.init = crypto_rfc4106_init_tfm;
990 inst->alg.exit = crypto_rfc4106_exit_tfm;
dadbc53d 991
adcbc688
HX
992 inst->alg.setkey = crypto_rfc4106_setkey;
993 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
994 inst->alg.encrypt = crypto_rfc4106_encrypt;
995 inst->alg.decrypt = crypto_rfc4106_decrypt;
dadbc53d 996
7b05a373
HX
997 inst->free = crypto_rfc4106_free;
998
adcbc688
HX
999 err = aead_register_instance(tmpl, inst);
1000 if (err)
1001 goto out_drop_alg;
dadbc53d
HX
1002
1003out:
adcbc688 1004 return err;
dadbc53d
HX
1005
1006out_drop_alg:
1007 crypto_drop_aead(spawn);
1008out_free_inst:
1009 kfree(inst);
dadbc53d
HX
1010 goto out;
1011}
1012
dadbc53d
HX
1013static struct crypto_template crypto_rfc4106_tmpl = {
1014 .name = "rfc4106",
adcbc688 1015 .create = crypto_rfc4106_create,
dadbc53d
HX
1016 .module = THIS_MODULE,
1017};
1018
73c89c15
TB
1019static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1020 unsigned int keylen)
1021{
1022 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1023 struct crypto_aead *child = ctx->child;
1024 int err;
1025
1026 if (keylen < 4)
1027 return -EINVAL;
1028
1029 keylen -= 4;
1030 memcpy(ctx->nonce, key + keylen, 4);
1031
1032 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1033 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1034 CRYPTO_TFM_REQ_MASK);
1035 err = crypto_aead_setkey(child, key, keylen);
1036 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1037 CRYPTO_TFM_RES_MASK);
1038
1039 return err;
1040}
1041
1042static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1043 unsigned int authsize)
1044{
1045 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1046
1047 if (authsize != 16)
1048 return -EINVAL;
1049
1050 return crypto_aead_setauthsize(ctx->child, authsize);
1051}
1052
adcbc688 1053static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
73c89c15
TB
1054{
1055 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1056 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
adcbc688 1057 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
73c89c15 1058 struct aead_request *subreq = &rctx->subreq;
73c89c15 1059 unsigned int authsize = crypto_aead_authsize(aead);
73c89c15
TB
1060 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1061 crypto_aead_alignmask(ctx->child) + 1);
adcbc688
HX
1062 int err;
1063
1064 if (req->src != req->dst) {
1065 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1066 if (err)
1067 return err;
1068 }
73c89c15
TB
1069
1070 memcpy(iv, ctx->nonce, 4);
1071 memcpy(iv + 4, req->iv, 8);
1072
73c89c15 1073 aead_request_set_tfm(subreq, ctx->child);
adcbc688
HX
1074 aead_request_set_callback(subreq, req->base.flags,
1075 req->base.complete, req->base.data);
1076 aead_request_set_crypt(subreq, req->src, req->dst,
1077 enc ? 0 : authsize, iv);
1078 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1079 subreq->cryptlen);
1080
1081 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
73c89c15
TB
1082}
1083
9489667d
JK
1084static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1085{
1086 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1087 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1088 unsigned int authsize = crypto_aead_authsize(aead);
adcbc688
HX
1089 unsigned int nbytes = req->assoclen + req->cryptlen -
1090 (enc ? 0 : authsize);
16f37ecd
HX
1091 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1092
1093 skcipher_request_set_tfm(nreq, ctx->null);
1094 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1095 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
9489667d 1096
16f37ecd 1097 return crypto_skcipher_encrypt(nreq);
9489667d
JK
1098}
1099
73c89c15
TB
1100static int crypto_rfc4543_encrypt(struct aead_request *req)
1101{
adcbc688 1102 return crypto_rfc4543_crypt(req, true);
73c89c15
TB
1103}
1104
1105static int crypto_rfc4543_decrypt(struct aead_request *req)
1106{
adcbc688 1107 return crypto_rfc4543_crypt(req, false);
73c89c15
TB
1108}
1109
adcbc688 1110static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
73c89c15 1111{
adcbc688
HX
1112 struct aead_instance *inst = aead_alg_instance(tfm);
1113 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
9489667d 1114 struct crypto_aead_spawn *spawn = &ictx->aead;
adcbc688 1115 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
73c89c15 1116 struct crypto_aead *aead;
16f37ecd 1117 struct crypto_skcipher *null;
73c89c15 1118 unsigned long align;
9489667d 1119 int err = 0;
73c89c15
TB
1120
1121 aead = crypto_spawn_aead(spawn);
1122 if (IS_ERR(aead))
1123 return PTR_ERR(aead);
1124
16f37ecd 1125 null = crypto_get_default_null_skcipher2();
9489667d
JK
1126 err = PTR_ERR(null);
1127 if (IS_ERR(null))
1128 goto err_free_aead;
1129
73c89c15 1130 ctx->child = aead;
9489667d 1131 ctx->null = null;
73c89c15
TB
1132
1133 align = crypto_aead_alignmask(aead);
1134 align &= ~(crypto_tfm_ctx_alignment() - 1);
adcbc688
HX
1135 crypto_aead_set_reqsize(
1136 tfm,
5d72336f
HX
1137 sizeof(struct crypto_rfc4543_req_ctx) +
1138 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
adcbc688 1139 align + 12);
73c89c15
TB
1140
1141 return 0;
9489667d
JK
1142
1143err_free_aead:
1144 crypto_free_aead(aead);
1145 return err;
73c89c15
TB
1146}
1147
adcbc688 1148static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
73c89c15 1149{
adcbc688 1150 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
73c89c15
TB
1151
1152 crypto_free_aead(ctx->child);
16f37ecd 1153 crypto_put_default_null_skcipher2();
73c89c15
TB
1154}
1155
7b05a373
HX
1156static void crypto_rfc4543_free(struct aead_instance *inst)
1157{
1158 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1159
1160 crypto_drop_aead(&ctx->aead);
1161
1162 kfree(inst);
1163}
1164
adcbc688
HX
1165static int crypto_rfc4543_create(struct crypto_template *tmpl,
1166 struct rtattr **tb)
73c89c15
TB
1167{
1168 struct crypto_attr_type *algt;
adcbc688 1169 struct aead_instance *inst;
73c89c15 1170 struct crypto_aead_spawn *spawn;
adcbc688 1171 struct aead_alg *alg;
9489667d 1172 struct crypto_rfc4543_instance_ctx *ctx;
73c89c15
TB
1173 const char *ccm_name;
1174 int err;
1175
1176 algt = crypto_get_attr_type(tb);
73c89c15 1177 if (IS_ERR(algt))
adcbc688 1178 return PTR_ERR(algt);
73c89c15 1179
5e4b8c1f 1180 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
adcbc688 1181 return -EINVAL;
73c89c15
TB
1182
1183 ccm_name = crypto_attr_alg_name(tb[1]);
73c89c15 1184 if (IS_ERR(ccm_name))
adcbc688 1185 return PTR_ERR(ccm_name);
73c89c15 1186
9489667d 1187 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
73c89c15 1188 if (!inst)
adcbc688 1189 return -ENOMEM;
73c89c15 1190
adcbc688 1191 ctx = aead_instance_ctx(inst);
9489667d 1192 spawn = &ctx->aead;
adcbc688 1193 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
73c89c15
TB
1194 err = crypto_grab_aead(spawn, ccm_name, 0,
1195 crypto_requires_sync(algt->type, algt->mask));
1196 if (err)
1197 goto out_free_inst;
1198
adcbc688 1199 alg = crypto_spawn_aead_alg(spawn);
73c89c15
TB
1200
1201 err = -EINVAL;
1202
adcbc688
HX
1203 /* Underlying IV size must be 12. */
1204 if (crypto_aead_alg_ivsize(alg) != 12)
17db8546 1205 goto out_drop_alg;
73c89c15
TB
1206
1207 /* Not a stream cipher? */
adcbc688 1208 if (alg->base.cra_blocksize != 1)
17db8546 1209 goto out_drop_alg;
73c89c15
TB
1210
1211 err = -ENAMETOOLONG;
adcbc688
HX
1212 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1213 "rfc4543(%s)", alg->base.cra_name) >=
1214 CRYPTO_MAX_ALG_NAME ||
1215 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1216 "rfc4543(%s)", alg->base.cra_driver_name) >=
73c89c15 1217 CRYPTO_MAX_ALG_NAME)
17db8546 1218 goto out_drop_alg;
73c89c15 1219
adcbc688
HX
1220 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1221 inst->alg.base.cra_priority = alg->base.cra_priority;
1222 inst->alg.base.cra_blocksize = 1;
1223 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
73c89c15 1224
adcbc688 1225 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
73c89c15 1226
adcbc688 1227 inst->alg.ivsize = 8;
16f37ecd 1228 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
adcbc688 1229 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
73c89c15 1230
adcbc688
HX
1231 inst->alg.init = crypto_rfc4543_init_tfm;
1232 inst->alg.exit = crypto_rfc4543_exit_tfm;
73c89c15 1233
adcbc688
HX
1234 inst->alg.setkey = crypto_rfc4543_setkey;
1235 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1236 inst->alg.encrypt = crypto_rfc4543_encrypt;
1237 inst->alg.decrypt = crypto_rfc4543_decrypt;
73c89c15 1238
7b05a373
HX
1239 inst->free = crypto_rfc4543_free,
1240
adcbc688
HX
1241 err = aead_register_instance(tmpl, inst);
1242 if (err)
1243 goto out_drop_alg;
73c89c15
TB
1244
1245out:
adcbc688 1246 return err;
73c89c15
TB
1247
1248out_drop_alg:
1249 crypto_drop_aead(spawn);
1250out_free_inst:
1251 kfree(inst);
73c89c15
TB
1252 goto out;
1253}
1254
73c89c15
TB
1255static struct crypto_template crypto_rfc4543_tmpl = {
1256 .name = "rfc4543",
adcbc688 1257 .create = crypto_rfc4543_create,
73c89c15
TB
1258 .module = THIS_MODULE,
1259};
1260
28db8e3e
MH
1261static int __init crypto_gcm_module_init(void)
1262{
d00aa19b
HX
1263 int err;
1264
adcbc688 1265 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
9382d97a
HY
1266 if (!gcm_zeroes)
1267 return -ENOMEM;
1268
adcbc688
HX
1269 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1270
d00aa19b
HX
1271 err = crypto_register_template(&crypto_gcm_base_tmpl);
1272 if (err)
1273 goto out;
1274
1275 err = crypto_register_template(&crypto_gcm_tmpl);
1276 if (err)
1277 goto out_undo_base;
1278
dadbc53d
HX
1279 err = crypto_register_template(&crypto_rfc4106_tmpl);
1280 if (err)
1281 goto out_undo_gcm;
1282
73c89c15
TB
1283 err = crypto_register_template(&crypto_rfc4543_tmpl);
1284 if (err)
1285 goto out_undo_rfc4106;
1286
9382d97a 1287 return 0;
d00aa19b 1288
73c89c15
TB
1289out_undo_rfc4106:
1290 crypto_unregister_template(&crypto_rfc4106_tmpl);
dadbc53d
HX
1291out_undo_gcm:
1292 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b
HX
1293out_undo_base:
1294 crypto_unregister_template(&crypto_gcm_base_tmpl);
9382d97a
HY
1295out:
1296 kfree(gcm_zeroes);
1297 return err;
28db8e3e
MH
1298}
1299
1300static void __exit crypto_gcm_module_exit(void)
1301{
9382d97a 1302 kfree(gcm_zeroes);
73c89c15 1303 crypto_unregister_template(&crypto_rfc4543_tmpl);
dadbc53d 1304 crypto_unregister_template(&crypto_rfc4106_tmpl);
28db8e3e 1305 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b 1306 crypto_unregister_template(&crypto_gcm_base_tmpl);
28db8e3e
MH
1307}
1308
1309module_init(crypto_gcm_module_init);
1310module_exit(crypto_gcm_module_exit);
1311
1312MODULE_LICENSE("GPL");
1313MODULE_DESCRIPTION("Galois/Counter Mode");
1314MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
5d26a105
KC
1315MODULE_ALIAS_CRYPTO("gcm_base");
1316MODULE_ALIAS_CRYPTO("rfc4106");
1317MODULE_ALIAS_CRYPTO("rfc4543");
4943ba16 1318MODULE_ALIAS_CRYPTO("gcm");
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