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Herbert Xu3c09f172007-08-30 16:24:15 +08001/*
2 * Authenc: Simple AEAD wrapper for IPsec
3 *
Herbert Xu92d95ba2015-07-30 17:53:16 +08004 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
Herbert Xu3c09f172007-08-30 16:24:15 +08005 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
Herbert Xu68acbf82015-05-11 17:47:41 +080013#include <crypto/internal/aead.h>
Herbert Xu5f7082e2008-08-31 22:21:09 +100014#include <crypto/internal/hash.h>
Herbert Xu9ffde352007-12-17 20:12:49 +080015#include <crypto/internal/skcipher.h>
Herbert Xue236d4a2007-11-22 23:11:53 +080016#include <crypto/authenc.h>
Herbert Xu92d95ba2015-07-30 17:53:16 +080017#include <crypto/null.h>
Herbert Xu42c271c2007-12-07 18:52:49 +080018#include <crypto/scatterwalk.h>
Herbert Xu3c09f172007-08-30 16:24:15 +080019#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
Herbert Xue236d4a2007-11-22 23:11:53 +080023#include <linux/rtnetlink.h>
Herbert Xu3c09f172007-08-30 16:24:15 +080024#include <linux/slab.h>
25#include <linux/spinlock.h>
26
Herbert Xu3c09f172007-08-30 16:24:15 +080027struct authenc_instance_ctx {
Steffen Klassertcbdcf802009-08-05 19:35:34 +100028 struct crypto_ahash_spawn auth;
Herbert Xu9ffde352007-12-17 20:12:49 +080029 struct crypto_skcipher_spawn enc;
Herbert Xu92d95ba2015-07-30 17:53:16 +080030 unsigned int reqoff;
Herbert Xu3c09f172007-08-30 16:24:15 +080031};
32
33struct crypto_authenc_ctx {
Steffen Klassertcbdcf802009-08-05 19:35:34 +100034 struct crypto_ahash *auth;
Herbert Xu7217d492016-07-12 13:17:34 +080035 struct crypto_skcipher *enc;
36 struct crypto_skcipher *null;
Herbert Xu3c09f172007-08-30 16:24:15 +080037};
38
Steffen Klassertcbdcf802009-08-05 19:35:34 +100039struct authenc_request_ctx {
Herbert Xu92d95ba2015-07-30 17:53:16 +080040 struct scatterlist src[2];
41 struct scatterlist dst[2];
Steffen Klassertcbdcf802009-08-05 19:35:34 +100042 char tail[];
43};
44
Herbert Xu180ce7e2010-04-26 09:14:05 +080045static void authenc_request_complete(struct aead_request *req, int err)
46{
47 if (err != -EINPROGRESS)
48 aead_request_complete(req, err);
49}
50
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020051int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,
52 unsigned int keylen)
Herbert Xu3c09f172007-08-30 16:24:15 +080053{
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020054 struct rtattr *rta = (struct rtattr *)key;
Herbert Xue236d4a2007-11-22 23:11:53 +080055 struct crypto_authenc_key_param *param;
Herbert Xu3c09f172007-08-30 16:24:15 +080056
Herbert Xu12dc5e62007-12-10 10:55:21 +080057 if (!RTA_OK(rta, keylen))
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020058 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080059 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020060 return -EINVAL;
Eric Biggers44c67402018-12-16 23:23:22 -080061
62 /*
63 * RTA_OK() didn't align the rtattr's payload when validating that it
64 * fits in the buffer. Yet, the keys should start on the next 4-byte
65 * aligned boundary. To avoid confusion, require that the rtattr
66 * payload be exactly the param struct, which has a 4-byte aligned size.
67 */
68 if (RTA_PAYLOAD(rta) != sizeof(*param))
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020069 return -EINVAL;
Eric Biggers44c67402018-12-16 23:23:22 -080070 BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO);
Herbert Xue236d4a2007-11-22 23:11:53 +080071
72 param = RTA_DATA(rta);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020073 keys->enckeylen = be32_to_cpu(param->enckeylen);
Herbert Xue236d4a2007-11-22 23:11:53 +080074
Eric Biggers44c67402018-12-16 23:23:22 -080075 key += rta->rta_len;
76 keylen -= rta->rta_len;
Herbert Xue236d4a2007-11-22 23:11:53 +080077
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020078 if (keylen < keys->enckeylen)
79 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080080
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020081 keys->authkeylen = keylen - keys->enckeylen;
82 keys->authkey = key;
83 keys->enckey = key + keys->authkeylen;
84
85 return 0;
86}
87EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);
88
89static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
90 unsigned int keylen)
91{
92 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
93 struct crypto_ahash *auth = ctx->auth;
Herbert Xu7217d492016-07-12 13:17:34 +080094 struct crypto_skcipher *enc = ctx->enc;
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020095 struct crypto_authenc_keys keys;
96 int err = -EINVAL;
97
98 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
99 goto badkey;
Herbert Xu3c09f172007-08-30 16:24:15 +0800100
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000101 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
102 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
Herbert Xu3c09f172007-08-30 16:24:15 +0800103 CRYPTO_TFM_REQ_MASK);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +0200104 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000105 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
Herbert Xu3c09f172007-08-30 16:24:15 +0800106 CRYPTO_TFM_RES_MASK);
107
108 if (err)
109 goto out;
110
Herbert Xu7217d492016-07-12 13:17:34 +0800111 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
112 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
113 CRYPTO_TFM_REQ_MASK);
114 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
115 crypto_aead_set_flags(authenc, crypto_skcipher_get_flags(enc) &
Herbert Xu3c09f172007-08-30 16:24:15 +0800116 CRYPTO_TFM_RES_MASK);
117
118out:
Tudor-Dan Ambarusad2fdcd2018-04-03 09:39:00 +0300119 memzero_explicit(&keys, sizeof(keys));
Herbert Xu3c09f172007-08-30 16:24:15 +0800120 return err;
Herbert Xue236d4a2007-11-22 23:11:53 +0800121
122badkey:
123 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
124 goto out;
Herbert Xu3c09f172007-08-30 16:24:15 +0800125}
126
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000127static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
128{
129 struct aead_request *req = areq->data;
130 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800131 struct aead_instance *inst = aead_alg_instance(authenc);
132 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000133 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800134 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000135
136 if (err)
137 goto out;
138
Herbert Xu92d95ba2015-07-30 17:53:16 +0800139 scatterwalk_map_and_copy(ahreq->result, req->dst,
140 req->assoclen + req->cryptlen,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000141 crypto_aead_authsize(authenc), 1);
142
143out:
144 aead_request_complete(req, err);
145}
146
Herbert Xu92d95ba2015-07-30 17:53:16 +0800147static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
Herbert Xu3c09f172007-08-30 16:24:15 +0800148{
149 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800150 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800151 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800152 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000153 struct crypto_ahash *auth = ctx->auth;
154 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800155 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000156 u8 *hash = areq_ctx->tail;
157 int err;
158
159 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
160 crypto_ahash_alignmask(auth) + 1);
161
162 ahash_request_set_tfm(ahreq, auth);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800163 ahash_request_set_crypt(ahreq, req->dst, hash,
164 req->assoclen + req->cryptlen);
165 ahash_request_set_callback(ahreq, flags,
166 authenc_geniv_ahash_done, req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000167
168 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800169 if (err)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800170 return err;
Herbert Xu7c3d7032007-12-10 16:15:41 +0800171
Herbert Xu92d95ba2015-07-30 17:53:16 +0800172 scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,
Herbert Xu7ba683a2007-12-02 18:49:21 +1100173 crypto_aead_authsize(authenc), 1);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800174
Herbert Xu3c09f172007-08-30 16:24:15 +0800175 return 0;
176}
177
178static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
179 int err)
180{
Herbert Xua6976902008-08-23 01:04:06 +1000181 struct aead_request *areq = req->data;
182
Herbert Xu92d95ba2015-07-30 17:53:16 +0800183 if (err)
184 goto out;
Herbert Xue56dd562007-12-10 16:20:24 +0800185
Herbert Xu92d95ba2015-07-30 17:53:16 +0800186 err = crypto_authenc_genicv(areq, 0);
Herbert Xu3c09f172007-08-30 16:24:15 +0800187
Herbert Xu92d95ba2015-07-30 17:53:16 +0800188out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800189 authenc_request_complete(areq, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800190}
191
Herbert Xu92d95ba2015-07-30 17:53:16 +0800192static int crypto_authenc_copy_assoc(struct aead_request *req)
193{
194 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
195 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu7217d492016-07-12 13:17:34 +0800196 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800197
Herbert Xu7217d492016-07-12 13:17:34 +0800198 skcipher_request_set_tfm(skreq, ctx->null);
199 skcipher_request_set_callback(skreq, aead_request_flags(req),
200 NULL, NULL);
201 skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
202 NULL);
203
204 return crypto_skcipher_encrypt(skreq);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800205}
206
Herbert Xu3c09f172007-08-30 16:24:15 +0800207static int crypto_authenc_encrypt(struct aead_request *req)
208{
209 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800210 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800211 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800212 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassert50beceb2010-03-03 22:41:08 +0800213 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7217d492016-07-12 13:17:34 +0800214 struct crypto_skcipher *enc = ctx->enc;
Herbert Xue56dd562007-12-10 16:20:24 +0800215 unsigned int cryptlen = req->cryptlen;
Herbert Xu7217d492016-07-12 13:17:34 +0800216 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
217 ictx->reqoff);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800218 struct scatterlist *src, *dst;
Herbert Xu3c09f172007-08-30 16:24:15 +0800219 int err;
220
Herbert Xu92d95ba2015-07-30 17:53:16 +0800221 src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
222 dst = src;
223
224 if (req->src != req->dst) {
225 err = crypto_authenc_copy_assoc(req);
226 if (err)
227 return err;
228
Herbert Xu92d95ba2015-07-30 17:53:16 +0800229 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
230 }
231
Herbert Xu7217d492016-07-12 13:17:34 +0800232 skcipher_request_set_tfm(skreq, enc);
233 skcipher_request_set_callback(skreq, aead_request_flags(req),
234 crypto_authenc_encrypt_done, req);
235 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
Herbert Xu3c09f172007-08-30 16:24:15 +0800236
Herbert Xu7217d492016-07-12 13:17:34 +0800237 err = crypto_skcipher_encrypt(skreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800238 if (err)
239 return err;
240
Herbert Xu92d95ba2015-07-30 17:53:16 +0800241 return crypto_authenc_genicv(req, aead_request_flags(req));
Herbert Xue56dd562007-12-10 16:20:24 +0800242}
243
Herbert Xu92d95ba2015-07-30 17:53:16 +0800244static int crypto_authenc_decrypt_tail(struct aead_request *req,
245 unsigned int flags)
Herbert Xue56dd562007-12-10 16:20:24 +0800246{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800247 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
248 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xue56dd562007-12-10 16:20:24 +0800249 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800250 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
251 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
252 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Herbert Xu7217d492016-07-12 13:17:34 +0800253 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
254 ictx->reqoff);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800255 unsigned int authsize = crypto_aead_authsize(authenc);
256 u8 *ihash = ahreq->result + authsize;
257 struct scatterlist *src, *dst;
Herbert Xue56dd562007-12-10 16:20:24 +0800258
Herbert Xu92d95ba2015-07-30 17:53:16 +0800259 scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0);
Herbert Xue56dd562007-12-10 16:20:24 +0800260
Herbert Xu92d95ba2015-07-30 17:53:16 +0800261 if (crypto_memneq(ihash, ahreq->result, authsize))
262 return -EBADMSG;
263
Herbert Xu92d95ba2015-07-30 17:53:16 +0800264 src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
265 dst = src;
266
Harsh Jainc34252f2016-06-29 00:24:43 +0530267 if (req->src != req->dst)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800268 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800269
Herbert Xu7217d492016-07-12 13:17:34 +0800270 skcipher_request_set_tfm(skreq, ctx->enc);
271 skcipher_request_set_callback(skreq, aead_request_flags(req),
272 req->base.complete, req->base.data);
273 skcipher_request_set_crypt(skreq, src, dst,
274 req->cryptlen - authsize, req->iv);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800275
Herbert Xu7217d492016-07-12 13:17:34 +0800276 return crypto_skcipher_decrypt(skreq);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800277}
278
279static void authenc_verify_ahash_done(struct crypto_async_request *areq,
280 int err)
281{
282 struct aead_request *req = areq->data;
283
Herbert Xue56dd562007-12-10 16:20:24 +0800284 if (err)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800285 goto out;
Herbert Xue56dd562007-12-10 16:20:24 +0800286
Herbert Xu92d95ba2015-07-30 17:53:16 +0800287 err = crypto_authenc_decrypt_tail(req, 0);
Herbert Xu3c09f172007-08-30 16:24:15 +0800288
Herbert Xu92d95ba2015-07-30 17:53:16 +0800289out:
290 authenc_request_complete(req, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800291}
292
293static int crypto_authenc_decrypt(struct aead_request *req)
294{
295 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu481f34a2007-12-04 20:04:21 +1100296 unsigned int authsize = crypto_aead_authsize(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800297 struct aead_instance *inst = aead_alg_instance(authenc);
298 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
299 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
300 struct crypto_ahash *auth = ctx->auth;
301 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
302 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
303 u8 *hash = areq_ctx->tail;
Herbert Xu3c09f172007-08-30 16:24:15 +0800304 int err;
305
Herbert Xu92d95ba2015-07-30 17:53:16 +0800306 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
307 crypto_ahash_alignmask(auth) + 1);
Herbert Xu481f34a2007-12-04 20:04:21 +1100308
Herbert Xu92d95ba2015-07-30 17:53:16 +0800309 ahash_request_set_tfm(ahreq, auth);
310 ahash_request_set_crypt(ahreq, req->src, hash,
311 req->assoclen + req->cryptlen - authsize);
312 ahash_request_set_callback(ahreq, aead_request_flags(req),
313 authenc_verify_ahash_done, req);
314
315 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800316 if (err)
317 return err;
318
Herbert Xu92d95ba2015-07-30 17:53:16 +0800319 return crypto_authenc_decrypt_tail(req, aead_request_flags(req));
Herbert Xu3c09f172007-08-30 16:24:15 +0800320}
321
Herbert Xu92d95ba2015-07-30 17:53:16 +0800322static int crypto_authenc_init_tfm(struct crypto_aead *tfm)
Herbert Xu3c09f172007-08-30 16:24:15 +0800323{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800324 struct aead_instance *inst = aead_alg_instance(tfm);
325 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
326 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000327 struct crypto_ahash *auth;
Herbert Xu7217d492016-07-12 13:17:34 +0800328 struct crypto_skcipher *enc;
329 struct crypto_skcipher *null;
Herbert Xu3c09f172007-08-30 16:24:15 +0800330 int err;
331
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000332 auth = crypto_spawn_ahash(&ictx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800333 if (IS_ERR(auth))
334 return PTR_ERR(auth);
335
Eric Biggers60425a82016-10-28 09:52:19 -0700336 enc = crypto_spawn_skcipher(&ictx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800337 err = PTR_ERR(enc);
338 if (IS_ERR(enc))
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000339 goto err_free_ahash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800340
Eric Biggers3a2d4fb2017-12-07 10:56:34 -0800341 null = crypto_get_default_null_skcipher();
Herbert Xu92d95ba2015-07-30 17:53:16 +0800342 err = PTR_ERR(null);
343 if (IS_ERR(null))
344 goto err_free_skcipher;
345
Herbert Xu3c09f172007-08-30 16:24:15 +0800346 ctx->auth = auth;
347 ctx->enc = enc;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800348 ctx->null = null;
Richard Hartmannf3542e62010-02-16 20:27:20 +0800349
Herbert Xu92d95ba2015-07-30 17:53:16 +0800350 crypto_aead_set_reqsize(
351 tfm,
Herbert Xu25df9192015-05-11 17:47:53 +0800352 sizeof(struct authenc_request_ctx) +
Herbert Xu92d95ba2015-07-30 17:53:16 +0800353 ictx->reqoff +
Herbert Xu25df9192015-05-11 17:47:53 +0800354 max_t(unsigned int,
Herbert Xu92d95ba2015-07-30 17:53:16 +0800355 crypto_ahash_reqsize(auth) +
356 sizeof(struct ahash_request),
Herbert Xu7217d492016-07-12 13:17:34 +0800357 sizeof(struct skcipher_request) +
358 crypto_skcipher_reqsize(enc)));
Herbert Xu3c09f172007-08-30 16:24:15 +0800359
360 return 0;
361
Herbert Xu92d95ba2015-07-30 17:53:16 +0800362err_free_skcipher:
Herbert Xu7217d492016-07-12 13:17:34 +0800363 crypto_free_skcipher(enc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000364err_free_ahash:
365 crypto_free_ahash(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800366 return err;
367}
368
Herbert Xu92d95ba2015-07-30 17:53:16 +0800369static void crypto_authenc_exit_tfm(struct crypto_aead *tfm)
Herbert Xu3c09f172007-08-30 16:24:15 +0800370{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800371 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
Herbert Xu3c09f172007-08-30 16:24:15 +0800372
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000373 crypto_free_ahash(ctx->auth);
Herbert Xu7217d492016-07-12 13:17:34 +0800374 crypto_free_skcipher(ctx->enc);
Eric Biggers3a2d4fb2017-12-07 10:56:34 -0800375 crypto_put_default_null_skcipher();
Herbert Xu3c09f172007-08-30 16:24:15 +0800376}
377
Herbert Xu92d95ba2015-07-30 17:53:16 +0800378static void crypto_authenc_free(struct aead_instance *inst)
379{
380 struct authenc_instance_ctx *ctx = aead_instance_ctx(inst);
381
382 crypto_drop_skcipher(&ctx->enc);
383 crypto_drop_ahash(&ctx->auth);
384 kfree(inst);
385}
386
387static int crypto_authenc_create(struct crypto_template *tmpl,
388 struct rtattr **tb)
Herbert Xu3c09f172007-08-30 16:24:15 +0800389{
Herbert Xu9ffde352007-12-17 20:12:49 +0800390 struct crypto_attr_type *algt;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800391 struct aead_instance *inst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000392 struct hash_alg_common *auth;
393 struct crypto_alg *auth_base;
Herbert Xu7217d492016-07-12 13:17:34 +0800394 struct skcipher_alg *enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800395 struct authenc_instance_ctx *ctx;
Herbert Xu9ffde352007-12-17 20:12:49 +0800396 const char *enc_name;
Herbert Xu3c09f172007-08-30 16:24:15 +0800397 int err;
398
Herbert Xu9ffde352007-12-17 20:12:49 +0800399 algt = crypto_get_attr_type(tb);
Herbert Xu9ffde352007-12-17 20:12:49 +0800400 if (IS_ERR(algt))
Herbert Xu92d95ba2015-07-30 17:53:16 +0800401 return PTR_ERR(algt);
Herbert Xu3c09f172007-08-30 16:24:15 +0800402
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800403 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800404 return -EINVAL;
Herbert Xu9ffde352007-12-17 20:12:49 +0800405
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000406 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
Herbert Xu927ef322016-06-29 18:03:46 +0800407 CRYPTO_ALG_TYPE_AHASH_MASK |
408 crypto_requires_sync(algt->type, algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800409 if (IS_ERR(auth))
Herbert Xu92d95ba2015-07-30 17:53:16 +0800410 return PTR_ERR(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800411
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000412 auth_base = &auth->base;
413
Herbert Xu9ffde352007-12-17 20:12:49 +0800414 enc_name = crypto_attr_alg_name(tb[2]);
415 err = PTR_ERR(enc_name);
416 if (IS_ERR(enc_name))
Herbert Xu3c09f172007-08-30 16:24:15 +0800417 goto out_put_auth;
418
Herbert Xu3c09f172007-08-30 16:24:15 +0800419 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
420 err = -ENOMEM;
421 if (!inst)
Herbert Xu9ffde352007-12-17 20:12:49 +0800422 goto out_put_auth;
Herbert Xue236d4a2007-11-22 23:11:53 +0800423
Herbert Xu92d95ba2015-07-30 17:53:16 +0800424 ctx = aead_instance_ctx(inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800425
Herbert Xu92d95ba2015-07-30 17:53:16 +0800426 err = crypto_init_ahash_spawn(&ctx->auth, auth,
427 aead_crypto_instance(inst));
Herbert Xu3c09f172007-08-30 16:24:15 +0800428 if (err)
429 goto err_free_inst;
430
Herbert Xu92d95ba2015-07-30 17:53:16 +0800431 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
Eric Biggersa35528e2016-10-28 09:51:13 -0700432 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
433 crypto_requires_sync(algt->type,
434 algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800435 if (err)
436 goto err_drop_auth;
437
Herbert Xu7217d492016-07-12 13:17:34 +0800438 enc = crypto_spawn_skcipher_alg(&ctx->enc);
Herbert Xu9ffde352007-12-17 20:12:49 +0800439
Herbert Xu92d95ba2015-07-30 17:53:16 +0800440 ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
441 auth_base->cra_alignmask + 1);
442
Herbert Xu9ffde352007-12-17 20:12:49 +0800443 err = -ENAMETOOLONG;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800444 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu7217d492016-07-12 13:17:34 +0800445 "authenc(%s,%s)", auth_base->cra_name,
446 enc->base.cra_name) >=
Herbert Xu9ffde352007-12-17 20:12:49 +0800447 CRYPTO_MAX_ALG_NAME)
448 goto err_drop_enc;
449
Herbert Xu92d95ba2015-07-30 17:53:16 +0800450 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000451 "authenc(%s,%s)", auth_base->cra_driver_name,
Herbert Xu7217d492016-07-12 13:17:34 +0800452 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xu9ffde352007-12-17 20:12:49 +0800453 goto err_drop_enc;
454
Herbert Xu7217d492016-07-12 13:17:34 +0800455 inst->alg.base.cra_flags = (auth_base->cra_flags |
456 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
457 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
Herbert Xu92d95ba2015-07-30 17:53:16 +0800458 auth_base->cra_priority;
Herbert Xu7217d492016-07-12 13:17:34 +0800459 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800460 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
Herbert Xu7217d492016-07-12 13:17:34 +0800461 enc->base.cra_alignmask;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800462 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
Herbert Xu3c09f172007-08-30 16:24:15 +0800463
Herbert Xu7217d492016-07-12 13:17:34 +0800464 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
465 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800466 inst->alg.maxauthsize = auth->digestsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800467
Herbert Xu92d95ba2015-07-30 17:53:16 +0800468 inst->alg.init = crypto_authenc_init_tfm;
469 inst->alg.exit = crypto_authenc_exit_tfm;
Herbert Xu3c09f172007-08-30 16:24:15 +0800470
Herbert Xu92d95ba2015-07-30 17:53:16 +0800471 inst->alg.setkey = crypto_authenc_setkey;
472 inst->alg.encrypt = crypto_authenc_encrypt;
473 inst->alg.decrypt = crypto_authenc_decrypt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800474
Herbert Xu92d95ba2015-07-30 17:53:16 +0800475 inst->free = crypto_authenc_free;
476
477 err = aead_register_instance(tmpl, inst);
478 if (err)
479 goto err_drop_enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800480
481out:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000482 crypto_mod_put(auth_base);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800483 return err;
Herbert Xu3c09f172007-08-30 16:24:15 +0800484
Herbert Xu9ffde352007-12-17 20:12:49 +0800485err_drop_enc:
486 crypto_drop_skcipher(&ctx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800487err_drop_auth:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000488 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800489err_free_inst:
490 kfree(inst);
Herbert Xu9ffde352007-12-17 20:12:49 +0800491out_put_auth:
Herbert Xu3c09f172007-08-30 16:24:15 +0800492 goto out;
493}
494
Herbert Xu3c09f172007-08-30 16:24:15 +0800495static struct crypto_template crypto_authenc_tmpl = {
496 .name = "authenc",
Herbert Xu92d95ba2015-07-30 17:53:16 +0800497 .create = crypto_authenc_create,
Herbert Xu3c09f172007-08-30 16:24:15 +0800498 .module = THIS_MODULE,
499};
500
501static int __init crypto_authenc_module_init(void)
502{
503 return crypto_register_template(&crypto_authenc_tmpl);
504}
505
506static void __exit crypto_authenc_module_exit(void)
507{
508 crypto_unregister_template(&crypto_authenc_tmpl);
509}
510
511module_init(crypto_authenc_module_init);
512module_exit(crypto_authenc_module_exit);
513
514MODULE_LICENSE("GPL");
515MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
Kees Cook4943ba12014-11-24 16:32:38 -0800516MODULE_ALIAS_CRYPTO("authenc");