blob: 0c0468869e25b51035cf363fd3f3e2f7903330fb [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;
38 struct crypto_ablkcipher *enc;
Herbert Xu104880a2015-08-07 16:42:59 +080039 struct crypto_blkcipher *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;
68 struct crypto_ablkcipher *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
85 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
86 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
87 CRYPTO_TFM_REQ_MASK);
Mathias Krausefddc2c42013-10-15 13:49:31 +020088 err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
Steffen Klasserta5079d02011-03-08 00:04:58 +000089 crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
90 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);
185 struct blkcipher_desc desc = {
186 .tfm = ctx->null,
187 };
188
189 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, len);
190}
191
Steffen Klasserta5079d02011-03-08 00:04:58 +0000192static int crypto_authenc_esn_encrypt(struct aead_request *req)
193{
194 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000195 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800196 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000197 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
198 + ctx->reqoff);
Herbert Xu104880a2015-08-07 16:42:59 +0800199 struct crypto_ablkcipher *enc = ctx->enc;
200 unsigned int assoclen = req->assoclen;
201 unsigned int cryptlen = req->cryptlen;
202 struct scatterlist *src, *dst;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000203 int err;
204
Herbert Xu104880a2015-08-07 16:42:59 +0800205 sg_init_table(areq_ctx->src, 2);
206 src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
207 dst = src;
208
209 if (req->src != req->dst) {
210 err = crypto_authenc_esn_copy(req, assoclen);
211 if (err)
212 return err;
213
214 sg_init_table(areq_ctx->dst, 2);
215 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
216 }
217
Steffen Klasserta5079d02011-03-08 00:04:58 +0000218 ablkcipher_request_set_tfm(abreq, enc);
219 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
220 crypto_authenc_esn_encrypt_done, req);
Herbert Xu104880a2015-08-07 16:42:59 +0800221 ablkcipher_request_set_crypt(abreq, src, dst, cryptlen, req->iv);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000222
223 err = crypto_ablkcipher_encrypt(abreq);
224 if (err)
225 return err;
226
Herbert Xu104880a2015-08-07 16:42:59 +0800227 return crypto_authenc_esn_genicv(req, aead_request_flags(req));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000228}
229
Herbert Xu104880a2015-08-07 16:42:59 +0800230static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
231 unsigned int flags)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000232{
Herbert Xu104880a2015-08-07 16:42:59 +0800233 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
234 unsigned int authsize = crypto_aead_authsize(authenc_esn);
235 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000236 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xu104880a2015-08-07 16:42:59 +0800237 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
238 + ctx->reqoff);
239 struct crypto_ahash *auth = ctx->auth;
240 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
241 crypto_ahash_alignmask(auth) + 1);
242 unsigned int cryptlen = req->cryptlen - authsize;
243 unsigned int assoclen = req->assoclen;
244 struct scatterlist *dst = req->dst;
245 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
246 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000247
Herbert Xu104880a2015-08-07 16:42:59 +0800248 /* Move high-order bits of sequence number back. */
249 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
250 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
251 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000252
Herbert Xu104880a2015-08-07 16:42:59 +0800253 if (crypto_memneq(ihash, ohash, authsize))
254 return -EBADMSG;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000255
Herbert Xu104880a2015-08-07 16:42:59 +0800256 sg_init_table(areq_ctx->dst, 2);
257 dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
258
259 ablkcipher_request_set_tfm(abreq, ctx->enc);
260 ablkcipher_request_set_callback(abreq, flags,
261 req->base.complete, req->base.data);
262 ablkcipher_request_set_crypt(abreq, dst, dst, cryptlen, req->iv);
263
264 return crypto_ablkcipher_decrypt(abreq);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000265}
266
Herbert Xu104880a2015-08-07 16:42:59 +0800267static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
268 int err)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000269{
Herbert Xu104880a2015-08-07 16:42:59 +0800270 struct aead_request *req = areq->data;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000271
Herbert Xu104880a2015-08-07 16:42:59 +0800272 err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
273 aead_request_complete(req, err);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000274}
275
276static int crypto_authenc_esn_decrypt(struct aead_request *req)
277{
278 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
Herbert Xu104880a2015-08-07 16:42:59 +0800279 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000280 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
Herbert Xu104880a2015-08-07 16:42:59 +0800281 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000282 unsigned int authsize = crypto_aead_authsize(authenc_esn);
Herbert Xu104880a2015-08-07 16:42:59 +0800283 struct crypto_ahash *auth = ctx->auth;
284 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
285 crypto_ahash_alignmask(auth) + 1);
286 unsigned int assoclen = req->assoclen;
287 unsigned int cryptlen = req->cryptlen;
288 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
289 struct scatterlist *dst = req->dst;
290 u32 tmp[2];
Steffen Klasserta5079d02011-03-08 00:04:58 +0000291 int err;
292
Steffen Klasserta5079d02011-03-08 00:04:58 +0000293 cryptlen -= authsize;
294
Herbert Xu104880a2015-08-07 16:42:59 +0800295 if (req->src != dst) {
296 err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
297 if (err)
298 return err;
299 }
300
301 scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
302 authsize, 0);
303
304 if (!authsize)
305 goto tail;
306
307 /* Move high-order bits of sequence number to the end. */
308 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
309 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
310 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
311
312 sg_init_table(areq_ctx->dst, 2);
313 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
314
315 ahash_request_set_tfm(ahreq, auth);
316 ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
317 ahash_request_set_callback(ahreq, aead_request_flags(req),
318 authenc_esn_verify_ahash_done, req);
319
320 err = crypto_ahash_digest(ahreq);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000321 if (err)
322 return err;
323
Herbert Xu104880a2015-08-07 16:42:59 +0800324tail:
325 return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000326}
327
Herbert Xu104880a2015-08-07 16:42:59 +0800328static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000329{
Herbert Xu104880a2015-08-07 16:42:59 +0800330 struct aead_instance *inst = aead_alg_instance(tfm);
331 struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
332 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000333 struct crypto_ahash *auth;
334 struct crypto_ablkcipher *enc;
Herbert Xu104880a2015-08-07 16:42:59 +0800335 struct crypto_blkcipher *null;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000336 int err;
337
338 auth = crypto_spawn_ahash(&ictx->auth);
339 if (IS_ERR(auth))
340 return PTR_ERR(auth);
341
342 enc = crypto_spawn_skcipher(&ictx->enc);
343 err = PTR_ERR(enc);
344 if (IS_ERR(enc))
345 goto err_free_ahash;
346
Herbert Xu104880a2015-08-07 16:42:59 +0800347 null = crypto_get_default_null_skcipher();
348 err = PTR_ERR(null);
349 if (IS_ERR(null))
350 goto err_free_skcipher;
351
Steffen Klasserta5079d02011-03-08 00:04:58 +0000352 ctx->auth = auth;
353 ctx->enc = enc;
Herbert Xu104880a2015-08-07 16:42:59 +0800354 ctx->null = null;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000355
Herbert Xu104880a2015-08-07 16:42:59 +0800356 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
357 crypto_ahash_alignmask(auth) + 1);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000358
Herbert Xu104880a2015-08-07 16:42:59 +0800359 crypto_aead_set_reqsize(
360 tfm,
Herbert Xu6650d092015-05-11 17:47:55 +0800361 sizeof(struct authenc_esn_request_ctx) +
362 ctx->reqoff +
363 max_t(unsigned int,
364 crypto_ahash_reqsize(auth) +
365 sizeof(struct ahash_request),
366 sizeof(struct skcipher_givcrypt_request) +
367 crypto_ablkcipher_reqsize(enc)));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000368
369 return 0;
370
Herbert Xu104880a2015-08-07 16:42:59 +0800371err_free_skcipher:
372 crypto_free_ablkcipher(enc);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000373err_free_ahash:
374 crypto_free_ahash(auth);
375 return err;
376}
377
Herbert Xu104880a2015-08-07 16:42:59 +0800378static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000379{
Herbert Xu104880a2015-08-07 16:42:59 +0800380 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000381
382 crypto_free_ahash(ctx->auth);
383 crypto_free_ablkcipher(ctx->enc);
Herbert Xu104880a2015-08-07 16:42:59 +0800384 crypto_put_default_null_skcipher();
Steffen Klasserta5079d02011-03-08 00:04:58 +0000385}
386
Herbert Xu104880a2015-08-07 16:42:59 +0800387static void crypto_authenc_esn_free(struct aead_instance *inst)
388{
389 struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
390
391 crypto_drop_skcipher(&ctx->enc);
392 crypto_drop_ahash(&ctx->auth);
393 kfree(inst);
394}
395
396static int crypto_authenc_esn_create(struct crypto_template *tmpl,
397 struct rtattr **tb)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000398{
399 struct crypto_attr_type *algt;
Herbert Xu104880a2015-08-07 16:42:59 +0800400 struct aead_instance *inst;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000401 struct hash_alg_common *auth;
402 struct crypto_alg *auth_base;
403 struct crypto_alg *enc;
404 struct authenc_esn_instance_ctx *ctx;
405 const char *enc_name;
406 int err;
407
408 algt = crypto_get_attr_type(tb);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000409 if (IS_ERR(algt))
Herbert Xu104880a2015-08-07 16:42:59 +0800410 return PTR_ERR(algt);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000411
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800412 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu104880a2015-08-07 16:42:59 +0800413 return -EINVAL;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000414
415 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
416 CRYPTO_ALG_TYPE_AHASH_MASK);
417 if (IS_ERR(auth))
Herbert Xu104880a2015-08-07 16:42:59 +0800418 return PTR_ERR(auth);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000419
420 auth_base = &auth->base;
421
422 enc_name = crypto_attr_alg_name(tb[2]);
423 err = PTR_ERR(enc_name);
424 if (IS_ERR(enc_name))
425 goto out_put_auth;
426
427 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
428 err = -ENOMEM;
429 if (!inst)
430 goto out_put_auth;
431
Herbert Xu104880a2015-08-07 16:42:59 +0800432 ctx = aead_instance_ctx(inst);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000433
Herbert Xu104880a2015-08-07 16:42:59 +0800434 err = crypto_init_ahash_spawn(&ctx->auth, auth,
435 aead_crypto_instance(inst));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000436 if (err)
437 goto err_free_inst;
438
Herbert Xu104880a2015-08-07 16:42:59 +0800439 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
Steffen Klasserta5079d02011-03-08 00:04:58 +0000440 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
441 crypto_requires_sync(algt->type,
442 algt->mask));
443 if (err)
444 goto err_drop_auth;
445
446 enc = crypto_skcipher_spawn_alg(&ctx->enc);
447
448 err = -ENAMETOOLONG;
Herbert Xu104880a2015-08-07 16:42:59 +0800449 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
450 "authencesn(%s,%s)", auth_base->cra_name,
451 enc->cra_name) >= CRYPTO_MAX_ALG_NAME)
Steffen Klasserta5079d02011-03-08 00:04:58 +0000452 goto err_drop_enc;
453
Herbert Xu104880a2015-08-07 16:42:59 +0800454 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klasserta5079d02011-03-08 00:04:58 +0000455 "authencesn(%s,%s)", auth_base->cra_driver_name,
456 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
457 goto err_drop_enc;
458
Herbert Xu104880a2015-08-07 16:42:59 +0800459 inst->alg.base.cra_flags = enc->cra_flags & CRYPTO_ALG_ASYNC;
Herbert Xu104880a2015-08-07 16:42:59 +0800460 inst->alg.base.cra_priority = enc->cra_priority * 10 +
461 auth_base->cra_priority;
462 inst->alg.base.cra_blocksize = enc->cra_blocksize;
463 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
464 enc->cra_alignmask;
465 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
Steffen Klasserta5079d02011-03-08 00:04:58 +0000466
Herbert Xu104880a2015-08-07 16:42:59 +0800467 inst->alg.ivsize = enc->cra_ablkcipher.ivsize;
468 inst->alg.maxauthsize = auth->digestsize;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000469
Herbert Xu104880a2015-08-07 16:42:59 +0800470 inst->alg.init = crypto_authenc_esn_init_tfm;
471 inst->alg.exit = crypto_authenc_esn_exit_tfm;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000472
Herbert Xu104880a2015-08-07 16:42:59 +0800473 inst->alg.setkey = crypto_authenc_esn_setkey;
474 inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
475 inst->alg.encrypt = crypto_authenc_esn_encrypt;
476 inst->alg.decrypt = crypto_authenc_esn_decrypt;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000477
Herbert Xu104880a2015-08-07 16:42:59 +0800478 inst->free = crypto_authenc_esn_free,
479
480 err = aead_register_instance(tmpl, inst);
481 if (err)
482 goto err_drop_enc;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000483
484out:
485 crypto_mod_put(auth_base);
Herbert Xu104880a2015-08-07 16:42:59 +0800486 return err;
Steffen Klasserta5079d02011-03-08 00:04:58 +0000487
488err_drop_enc:
489 crypto_drop_skcipher(&ctx->enc);
490err_drop_auth:
491 crypto_drop_ahash(&ctx->auth);
492err_free_inst:
493 kfree(inst);
494out_put_auth:
Steffen Klasserta5079d02011-03-08 00:04:58 +0000495 goto out;
496}
497
Steffen Klasserta5079d02011-03-08 00:04:58 +0000498static struct crypto_template crypto_authenc_esn_tmpl = {
499 .name = "authencesn",
Herbert Xu104880a2015-08-07 16:42:59 +0800500 .create = crypto_authenc_esn_create,
Steffen Klasserta5079d02011-03-08 00:04:58 +0000501 .module = THIS_MODULE,
502};
503
504static int __init crypto_authenc_esn_module_init(void)
505{
506 return crypto_register_template(&crypto_authenc_esn_tmpl);
507}
508
509static void __exit crypto_authenc_esn_module_exit(void)
510{
511 crypto_unregister_template(&crypto_authenc_esn_tmpl);
512}
513
514module_init(crypto_authenc_esn_module_init);
515module_exit(crypto_authenc_esn_module_exit);
516
517MODULE_LICENSE("GPL");
518MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
519MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
Kees Cook4943ba12014-11-24 16:32:38 -0800520MODULE_ALIAS_CRYPTO("authencesn");