blob: 15f91ddd7f0e4e55cfba21b3da4505532e85cac3 [file] [log] [blame]
Steffen Klasserta5079d02011-03-08 00:04:58 +00001/*
2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
3 * derived from authenc.c
4 *
5 * Copyright (C) 2010 secunet Security Networks AG
6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
Herbert Xu104880a2015-08-07 16:42:59 +08007 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
Steffen Klasserta5079d02011-03-08 00:04:58 +00008 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
Herbert Xu7fb2a4b2015-05-11 17:47:42 +080016#include <crypto/internal/aead.h>
Steffen Klasserta5079d02011-03-08 00:04:58 +000017#include <crypto/internal/hash.h>
18#include <crypto/internal/skcipher.h>
19#include <crypto/authenc.h>
Herbert Xu104880a2015-08-07 16:42:59 +080020#include <crypto/null.h>
Steffen Klasserta5079d02011-03-08 00:04:58 +000021#include <crypto/scatterwalk.h>
22#include <linux/err.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/rtnetlink.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29
30struct authenc_esn_instance_ctx {
31 struct crypto_ahash_spawn auth;
32 struct crypto_skcipher_spawn enc;
33};
34
35struct crypto_authenc_esn_ctx {
36 unsigned int reqoff;
37 struct crypto_ahash *auth;
Herbert Xue75445a2016-07-12 13:17:35 +080038 struct crypto_skcipher *enc;
39 struct crypto_skcipher *null;
Steffen Klasserta5079d02011-03-08 00:04:58 +000040};
41
42struct authenc_esn_request_ctx {
Herbert Xu104880a2015-08-07 16:42:59 +080043 struct scatterlist src[2];
44 struct scatterlist dst[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +000045 char tail[];
46};
47
48static void authenc_esn_request_complete(struct aead_request *req, int err)
49{
50 if (err != -EINPROGRESS)
51 aead_request_complete(req, err);
52}
53
Herbert Xu104880a2015-08-07 16:42:59 +080054static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
55 unsigned int authsize)
56{
57 if (authsize > 0 && authsize < 4)
58 return -EINVAL;
59
60 return 0;
61}
62
Steffen Klasserta5079d02011-03-08 00:04:58 +000063static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
64 unsigned int keylen)
65{
Steffen Klasserta5079d02011-03-08 00:04:58 +000066 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
67 struct crypto_ahash *auth = ctx->auth;
Herbert Xue75445a2016-07-12 13:17:35 +080068 struct crypto_skcipher *enc = ctx->enc;
Mathias Krausefddc2c42013-10-15 13:49:31 +020069 struct crypto_authenc_keys keys;
Steffen Klasserta5079d02011-03-08 00:04:58 +000070 int err = -EINVAL;
71
Mathias Krausefddc2c42013-10-15 13:49:31 +020072 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
Steffen Klasserta5079d02011-03-08 00:04:58 +000073 goto badkey;
Steffen Klasserta5079d02011-03-08 00:04:58 +000074
75 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
76 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
77 CRYPTO_TFM_REQ_MASK);
Mathias Krausefddc2c42013-10-15 13:49:31 +020078 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
Steffen Klasserta5079d02011-03-08 00:04:58 +000079 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
80 CRYPTO_TFM_RES_MASK);
81
82 if (err)
83 goto out;
84
Herbert Xue75445a2016-07-12 13:17:35 +080085 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
86 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
Steffen Klasserta5079d02011-03-08 00:04:58 +000087 CRYPTO_TFM_REQ_MASK);
Herbert Xue75445a2016-07-12 13:17:35 +080088 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
89 crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
Steffen Klasserta5079d02011-03-08 00:04:58 +000090 CRYPTO_TFM_RES_MASK);
91
92out:
93 return err;
94
95badkey:
96 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
97 goto out;
98}
99
Herbert Xu104880a2015-08-07 16:42:59 +0800100static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
101 unsigned int flags)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000102{
Steffen Klasserta5079d02011-03-08 00:04:58 +0000103 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
104 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
105 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800106 struct crypto_ahash *auth = ctx->auth;
107 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
108 crypto_ahash_alignmask(auth) + 1);
109 unsigned int authsize = crypto_aead_authsize(authenc_esn);
110 unsigned int assoclen = req->assoclen;
111 unsigned int cryptlen = req->cryptlen;
112 struct scatterlist *dst = req->dst;
113 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000114
Herbert Xu104880a2015-08-07 16:42:59 +0800115 /* Move high-order bits of sequence number back. */
116 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
117 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
118 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000119
Herbert Xu104880a2015-08-07 16:42:59 +0800120 scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
121 return 0;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000122}
123
Steffen Klasserta5079d02011-03-08 00:04:58 +0000124static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
125 int err)
126{
127 struct aead_request *req = areq->data;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000128
Herbert Xu104880a2015-08-07 16:42:59 +0800129 err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000130 aead_request_complete(req, err);
131}
132
Herbert Xu104880a2015-08-07 16:42:59 +0800133static int crypto_authenc_esn_genicv(struct aead_request *req,
Steffen Klasserta5079d02011-03-08 00:04:58 +0000134 unsigned int flags)
135{
136 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
137 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800138 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
139 struct crypto_ahash *auth = ctx->auth;
140 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
141 crypto_ahash_alignmask(auth) + 1);
142 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
143 unsigned int authsize = crypto_aead_authsize(authenc_esn);
144 unsigned int assoclen = req->assoclen;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000145 unsigned int cryptlen = req->cryptlen;
Herbert Xu104880a2015-08-07 16:42:59 +0800146 struct scatterlist *dst = req->dst;
147 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000148
Herbert Xu104880a2015-08-07 16:42:59 +0800149 if (!authsize)
150 return 0;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000151
Herbert Xu104880a2015-08-07 16:42:59 +0800152 /* Move high-order bits of sequence number to the end. */
153 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
154 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
155 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000156
Herbert Xu104880a2015-08-07 16:42:59 +0800157 sg_init_table(areq_ctx->dst, 2);
158 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000159
Herbert Xu104880a2015-08-07 16:42:59 +0800160 ahash_request_set_tfm(ahreq, auth);
161 ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
162 ahash_request_set_callback(ahreq, flags,
163 authenc_esn_geniv_ahash_done, req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000164
Herbert Xu104880a2015-08-07 16:42:59 +0800165 return crypto_ahash_digest(ahreq) ?:
166 crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000167}
168
169
170static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
171 int err)
172{
173 struct aead_request *areq = req->data;
174
Herbert Xu104880a2015-08-07 16:42:59 +0800175 if (!err)
176 err = crypto_authenc_esn_genicv(areq, 0);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000177
178 authenc_esn_request_complete(areq, err);
179}
180
Herbert Xu104880a2015-08-07 16:42:59 +0800181static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
182{
183 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
184 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xue75445a2016-07-12 13:17:35 +0800185 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
Herbert Xu104880a2015-08-07 16:42:59 +0800186
Herbert Xue75445a2016-07-12 13:17:35 +0800187 skcipher_request_set_tfm(skreq, ctx->null);
188 skcipher_request_set_callback(skreq, aead_request_flags(req),
189 NULL, NULL);
190 skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
191
192 return crypto_skcipher_encrypt(skreq);
Herbert Xu104880a2015-08-07 16:42:59 +0800193}
194
Steffen Klasserta5079d02011-03-08 00:04:58 +0000195static int crypto_authenc_esn_encrypt(struct aead_request *req)
196{
197 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000198 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800199 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xue75445a2016-07-12 13:17:35 +0800200 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
201 ctx->reqoff);
202 struct crypto_skcipher *enc = ctx->enc;
Herbert Xu104880a2015-08-07 16:42:59 +0800203 unsigned int assoclen = req->assoclen;
204 unsigned int cryptlen = req->cryptlen;
205 struct scatterlist *src, *dst;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000206 int err;
207
Herbert Xu104880a2015-08-07 16:42:59 +0800208 sg_init_table(areq_ctx->src, 2);
209 src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
210 dst = src;
211
212 if (req->src != req->dst) {
213 err = crypto_authenc_esn_copy(req, assoclen);
214 if (err)
215 return err;
216
217 sg_init_table(areq_ctx->dst, 2);
218 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
219 }
220
Herbert Xue75445a2016-07-12 13:17:35 +0800221 skcipher_request_set_tfm(skreq, enc);
222 skcipher_request_set_callback(skreq, aead_request_flags(req),
223 crypto_authenc_esn_encrypt_done, req);
224 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000225
Herbert Xue75445a2016-07-12 13:17:35 +0800226 err = crypto_skcipher_encrypt(skreq);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000227 if (err)
228 return err;
229
Herbert Xu104880a2015-08-07 16:42:59 +0800230 return crypto_authenc_esn_genicv(req, aead_request_flags(req));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000231}
232
Herbert Xu104880a2015-08-07 16:42:59 +0800233static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
234 unsigned int flags)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000235{
Herbert Xu104880a2015-08-07 16:42:59 +0800236 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
237 unsigned int authsize = crypto_aead_authsize(authenc_esn);
238 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000239 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xue75445a2016-07-12 13:17:35 +0800240 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
241 ctx->reqoff);
Herbert Xu104880a2015-08-07 16:42:59 +0800242 struct crypto_ahash *auth = ctx->auth;
243 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
244 crypto_ahash_alignmask(auth) + 1);
245 unsigned int cryptlen = req->cryptlen - authsize;
246 unsigned int assoclen = req->assoclen;
247 struct scatterlist *dst = req->dst;
248 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
249 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000250
Herbert Xu41cdf7a2017-07-17 15:32:30 +0800251 if (!authsize)
252 goto decrypt;
253
Herbert Xu104880a2015-08-07 16:42:59 +0800254 /* Move high-order bits of sequence number back. */
255 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
256 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
257 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000258
Herbert Xu104880a2015-08-07 16:42:59 +0800259 if (crypto_memneq(ihash, ohash, authsize))
260 return -EBADMSG;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000261
Herbert Xu41cdf7a2017-07-17 15:32:30 +0800262decrypt:
263
Herbert Xu104880a2015-08-07 16:42:59 +0800264 sg_init_table(areq_ctx->dst, 2);
265 dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
266
Herbert Xue75445a2016-07-12 13:17:35 +0800267 skcipher_request_set_tfm(skreq, ctx->enc);
268 skcipher_request_set_callback(skreq, flags,
269 req->base.complete, req->base.data);
270 skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
Herbert Xu104880a2015-08-07 16:42:59 +0800271
Herbert Xue75445a2016-07-12 13:17:35 +0800272 return crypto_skcipher_decrypt(skreq);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000273}
274
Herbert Xu104880a2015-08-07 16:42:59 +0800275static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
276 int err)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000277{
Herbert Xu104880a2015-08-07 16:42:59 +0800278 struct aead_request *req = areq->data;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000279
Herbert Xu104880a2015-08-07 16:42:59 +0800280 err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
281 aead_request_complete(req, err);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000282}
283
284static int crypto_authenc_esn_decrypt(struct aead_request *req)
285{
286 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800287 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000288 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xu104880a2015-08-07 16:42:59 +0800289 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000290 unsigned int authsize = crypto_aead_authsize(authenc_esn);
Herbert Xu104880a2015-08-07 16:42:59 +0800291 struct crypto_ahash *auth = ctx->auth;
292 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
293 crypto_ahash_alignmask(auth) + 1);
294 unsigned int assoclen = req->assoclen;
295 unsigned int cryptlen = req->cryptlen;
296 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
297 struct scatterlist *dst = req->dst;
298 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000299 int err;
300
Steffen Klasserta5079d02011-03-08 00:04:58 +0000301 cryptlen -= authsize;
302
Herbert Xu104880a2015-08-07 16:42:59 +0800303 if (req->src != dst) {
304 err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
305 if (err)
306 return err;
307 }
308
309 scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
310 authsize, 0);
311
312 if (!authsize)
313 goto tail;
314
315 /* Move high-order bits of sequence number to the end. */
316 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
317 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
318 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
319
320 sg_init_table(areq_ctx->dst, 2);
321 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
322
323 ahash_request_set_tfm(ahreq, auth);
324 ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
325 ahash_request_set_callback(ahreq, aead_request_flags(req),
326 authenc_esn_verify_ahash_done, req);
327
328 err = crypto_ahash_digest(ahreq);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000329 if (err)
330 return err;
331
Herbert Xu104880a2015-08-07 16:42:59 +0800332tail:
333 return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000334}
335
Herbert Xu104880a2015-08-07 16:42:59 +0800336static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000337{
Herbert Xu104880a2015-08-07 16:42:59 +0800338 struct aead_instance *inst = aead_alg_instance(tfm);
339 struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
340 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000341 struct crypto_ahash *auth;
Herbert Xue75445a2016-07-12 13:17:35 +0800342 struct crypto_skcipher *enc;
343 struct crypto_skcipher *null;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000344 int err;
345
346 auth = crypto_spawn_ahash(&ictx->auth);
347 if (IS_ERR(auth))
348 return PTR_ERR(auth);
349
Eric Biggers60425a82016-10-28 09:52:19 -0700350 enc = crypto_spawn_skcipher(&ictx->enc);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000351 err = PTR_ERR(enc);
352 if (IS_ERR(enc))
353 goto err_free_ahash;
354
Eric Biggers3a2d4fb2017-12-07 10:56:34 -0800355 null = crypto_get_default_null_skcipher();
Herbert Xu104880a2015-08-07 16:42:59 +0800356 err = PTR_ERR(null);
357 if (IS_ERR(null))
358 goto err_free_skcipher;
359
Steffen Klasserta5079d02011-03-08 00:04:58 +0000360 ctx->auth = auth;
361 ctx->enc = enc;
Herbert Xu104880a2015-08-07 16:42:59 +0800362 ctx->null = null;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000363
Herbert Xu104880a2015-08-07 16:42:59 +0800364 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
365 crypto_ahash_alignmask(auth) + 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000366
Herbert Xu104880a2015-08-07 16:42:59 +0800367 crypto_aead_set_reqsize(
368 tfm,
Herbert Xu6650d092015-05-11 17:47:55 +0800369 sizeof(struct authenc_esn_request_ctx) +
370 ctx->reqoff +
371 max_t(unsigned int,
Herbert Xue75445a2016-07-12 13:17:35 +0800372 crypto_ahash_reqsize(auth) +
373 sizeof(struct ahash_request),
374 sizeof(struct skcipher_request) +
375 crypto_skcipher_reqsize(enc)));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000376
377 return 0;
378
Herbert Xu104880a2015-08-07 16:42:59 +0800379err_free_skcipher:
Herbert Xue75445a2016-07-12 13:17:35 +0800380 crypto_free_skcipher(enc);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000381err_free_ahash:
382 crypto_free_ahash(auth);
383 return err;
384}
385
Herbert Xu104880a2015-08-07 16:42:59 +0800386static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000387{
Herbert Xu104880a2015-08-07 16:42:59 +0800388 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000389
390 crypto_free_ahash(ctx->auth);
Herbert Xue75445a2016-07-12 13:17:35 +0800391 crypto_free_skcipher(ctx->enc);
Eric Biggers3a2d4fb2017-12-07 10:56:34 -0800392 crypto_put_default_null_skcipher();
Steffen Klasserta5079d02011-03-08 00:04:58 +0000393}
394
Herbert Xu104880a2015-08-07 16:42:59 +0800395static void crypto_authenc_esn_free(struct aead_instance *inst)
396{
397 struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
398
399 crypto_drop_skcipher(&ctx->enc);
400 crypto_drop_ahash(&ctx->auth);
401 kfree(inst);
402}
403
404static int crypto_authenc_esn_create(struct crypto_template *tmpl,
405 struct rtattr **tb)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000406{
407 struct crypto_attr_type *algt;
Herbert Xu104880a2015-08-07 16:42:59 +0800408 struct aead_instance *inst;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000409 struct hash_alg_common *auth;
410 struct crypto_alg *auth_base;
Herbert Xue75445a2016-07-12 13:17:35 +0800411 struct skcipher_alg *enc;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000412 struct authenc_esn_instance_ctx *ctx;
413 const char *enc_name;
414 int err;
415
416 algt = crypto_get_attr_type(tb);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000417 if (IS_ERR(algt))
Herbert Xu104880a2015-08-07 16:42:59 +0800418 return PTR_ERR(algt);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000419
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800420 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu104880a2015-08-07 16:42:59 +0800421 return -EINVAL;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000422
423 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
Herbert Xu927ef322016-06-29 18:03:46 +0800424 CRYPTO_ALG_TYPE_AHASH_MASK |
425 crypto_requires_sync(algt->type, algt->mask));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000426 if (IS_ERR(auth))
Herbert Xu104880a2015-08-07 16:42:59 +0800427 return PTR_ERR(auth);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000428
429 auth_base = &auth->base;
430
431 enc_name = crypto_attr_alg_name(tb[2]);
432 err = PTR_ERR(enc_name);
433 if (IS_ERR(enc_name))
434 goto out_put_auth;
435
436 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
437 err = -ENOMEM;
438 if (!inst)
439 goto out_put_auth;
440
Herbert Xu104880a2015-08-07 16:42:59 +0800441 ctx = aead_instance_ctx(inst);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000442
Herbert Xu104880a2015-08-07 16:42:59 +0800443 err = crypto_init_ahash_spawn(&ctx->auth, auth,
444 aead_crypto_instance(inst));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000445 if (err)
446 goto err_free_inst;
447
Herbert Xu104880a2015-08-07 16:42:59 +0800448 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
Eric Biggersa35528e2016-10-28 09:51:13 -0700449 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
450 crypto_requires_sync(algt->type,
451 algt->mask));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000452 if (err)
453 goto err_drop_auth;
454
Herbert Xue75445a2016-07-12 13:17:35 +0800455 enc = crypto_spawn_skcipher_alg(&ctx->enc);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000456
457 err = -ENAMETOOLONG;
Herbert Xu104880a2015-08-07 16:42:59 +0800458 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
459 "authencesn(%s,%s)", auth_base->cra_name,
Herbert Xue75445a2016-07-12 13:17:35 +0800460 enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000461 goto err_drop_enc;
462
Herbert Xu104880a2015-08-07 16:42:59 +0800463 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klasserta5079d02011-03-08 00:04:58 +0000464 "authencesn(%s,%s)", auth_base->cra_driver_name,
Herbert Xue75445a2016-07-12 13:17:35 +0800465 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000466 goto err_drop_enc;
467
Herbert Xue75445a2016-07-12 13:17:35 +0800468 inst->alg.base.cra_flags = (auth_base->cra_flags |
469 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
470 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
Herbert Xu104880a2015-08-07 16:42:59 +0800471 auth_base->cra_priority;
Herbert Xue75445a2016-07-12 13:17:35 +0800472 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
Herbert Xu104880a2015-08-07 16:42:59 +0800473 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
Herbert Xue75445a2016-07-12 13:17:35 +0800474 enc->base.cra_alignmask;
Herbert Xu104880a2015-08-07 16:42:59 +0800475 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000476
Herbert Xue75445a2016-07-12 13:17:35 +0800477 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
478 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
Herbert Xu104880a2015-08-07 16:42:59 +0800479 inst->alg.maxauthsize = auth->digestsize;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000480
Herbert Xu104880a2015-08-07 16:42:59 +0800481 inst->alg.init = crypto_authenc_esn_init_tfm;
482 inst->alg.exit = crypto_authenc_esn_exit_tfm;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000483
Herbert Xu104880a2015-08-07 16:42:59 +0800484 inst->alg.setkey = crypto_authenc_esn_setkey;
485 inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
486 inst->alg.encrypt = crypto_authenc_esn_encrypt;
487 inst->alg.decrypt = crypto_authenc_esn_decrypt;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000488
Herbert Xu104880a2015-08-07 16:42:59 +0800489 inst->free = crypto_authenc_esn_free,
490
491 err = aead_register_instance(tmpl, inst);
492 if (err)
493 goto err_drop_enc;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000494
495out:
496 crypto_mod_put(auth_base);
Herbert Xu104880a2015-08-07 16:42:59 +0800497 return err;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000498
499err_drop_enc:
500 crypto_drop_skcipher(&ctx->enc);
501err_drop_auth:
502 crypto_drop_ahash(&ctx->auth);
503err_free_inst:
504 kfree(inst);
505out_put_auth:
Steffen Klasserta5079d02011-03-08 00:04:58 +0000506 goto out;
507}
508
Steffen Klasserta5079d02011-03-08 00:04:58 +0000509static struct crypto_template crypto_authenc_esn_tmpl = {
510 .name = "authencesn",
Herbert Xu104880a2015-08-07 16:42:59 +0800511 .create = crypto_authenc_esn_create,
Steffen Klasserta5079d02011-03-08 00:04:58 +0000512 .module = THIS_MODULE,
513};
514
515static int __init crypto_authenc_esn_module_init(void)
516{
517 return crypto_register_template(&crypto_authenc_esn_tmpl);
518}
519
520static void __exit crypto_authenc_esn_module_exit(void)
521{
522 crypto_unregister_template(&crypto_authenc_esn_tmpl);
523}
524
525module_init(crypto_authenc_esn_module_init);
526module_exit(crypto_authenc_esn_module_exit);
527
528MODULE_LICENSE("GPL");
529MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
530MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
Kees Cook4943ba12014-11-24 16:32:38 -0800531MODULE_ALIAS_CRYPTO("authencesn");