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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 Xu9ffde35a2007-12-17 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 Xu9ffde35a2007-12-17 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;
Herbert Xue236d4a2007-11-22 23:11:53 +080061 if (RTA_PAYLOAD(rta) < sizeof(*param))
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020062 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080063
64 param = RTA_DATA(rta);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020065 keys->enckeylen = be32_to_cpu(param->enckeylen);
Herbert Xue236d4a2007-11-22 23:11:53 +080066
67 key += RTA_ALIGN(rta->rta_len);
68 keylen -= RTA_ALIGN(rta->rta_len);
69
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020070 if (keylen < keys->enckeylen)
71 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080072
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020073 keys->authkeylen = keylen - keys->enckeylen;
74 keys->authkey = key;
75 keys->enckey = key + keys->authkeylen;
76
77 return 0;
78}
79EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);
80
81static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
82 unsigned int keylen)
83{
84 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
85 struct crypto_ahash *auth = ctx->auth;
Herbert Xu7217d492016-07-12 13:17:34 +080086 struct crypto_skcipher *enc = ctx->enc;
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020087 struct crypto_authenc_keys keys;
88 int err = -EINVAL;
89
90 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
91 goto badkey;
Herbert Xu3c09f172007-08-30 16:24:15 +080092
Steffen Klassertcbdcf802009-08-05 19:35:34 +100093 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
94 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
Herbert Xu3c09f172007-08-30 16:24:15 +080095 CRYPTO_TFM_REQ_MASK);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020096 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
Steffen Klassertcbdcf802009-08-05 19:35:34 +100097 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
Herbert Xu3c09f172007-08-30 16:24:15 +080098 CRYPTO_TFM_RES_MASK);
99
100 if (err)
101 goto out;
102
Herbert Xu7217d492016-07-12 13:17:34 +0800103 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
104 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
105 CRYPTO_TFM_REQ_MASK);
106 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
107 crypto_aead_set_flags(authenc, crypto_skcipher_get_flags(enc) &
Herbert Xu3c09f172007-08-30 16:24:15 +0800108 CRYPTO_TFM_RES_MASK);
109
110out:
111 return err;
Herbert Xue236d4a2007-11-22 23:11:53 +0800112
113badkey:
114 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
115 goto out;
Herbert Xu3c09f172007-08-30 16:24:15 +0800116}
117
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000118static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
119{
120 struct aead_request *req = areq->data;
121 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800122 struct aead_instance *inst = aead_alg_instance(authenc);
123 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000124 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800125 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000126
127 if (err)
128 goto out;
129
Herbert Xu92d95ba2015-07-30 17:53:16 +0800130 scatterwalk_map_and_copy(ahreq->result, req->dst,
131 req->assoclen + req->cryptlen,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000132 crypto_aead_authsize(authenc), 1);
133
134out:
135 aead_request_complete(req, err);
136}
137
Herbert Xu92d95ba2015-07-30 17:53:16 +0800138static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags)
Herbert Xu3c09f172007-08-30 16:24:15 +0800139{
140 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800141 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800142 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800143 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000144 struct crypto_ahash *auth = ctx->auth;
145 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800146 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000147 u8 *hash = areq_ctx->tail;
148 int err;
149
150 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
151 crypto_ahash_alignmask(auth) + 1);
152
153 ahash_request_set_tfm(ahreq, auth);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800154 ahash_request_set_crypt(ahreq, req->dst, hash,
155 req->assoclen + req->cryptlen);
156 ahash_request_set_callback(ahreq, flags,
157 authenc_geniv_ahash_done, req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000158
159 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800160 if (err)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800161 return err;
Herbert Xu7c3d7032007-12-10 16:15:41 +0800162
Herbert Xu92d95ba2015-07-30 17:53:16 +0800163 scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen,
Herbert Xu7ba683a2007-12-02 18:49:21 +1100164 crypto_aead_authsize(authenc), 1);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800165
Herbert Xu3c09f172007-08-30 16:24:15 +0800166 return 0;
167}
168
169static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
170 int err)
171{
Herbert Xua6976902008-08-23 01:04:06 +1000172 struct aead_request *areq = req->data;
173
Herbert Xu92d95ba2015-07-30 17:53:16 +0800174 if (err)
175 goto out;
Herbert Xue56dd562007-12-10 16:20:24 +0800176
Herbert Xu92d95ba2015-07-30 17:53:16 +0800177 err = crypto_authenc_genicv(areq, 0);
Herbert Xu3c09f172007-08-30 16:24:15 +0800178
Herbert Xu92d95ba2015-07-30 17:53:16 +0800179out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800180 authenc_request_complete(areq, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800181}
182
Herbert Xu92d95ba2015-07-30 17:53:16 +0800183static int crypto_authenc_copy_assoc(struct aead_request *req)
184{
185 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
186 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu7217d492016-07-12 13:17:34 +0800187 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800188
Herbert Xu7217d492016-07-12 13:17:34 +0800189 skcipher_request_set_tfm(skreq, ctx->null);
190 skcipher_request_set_callback(skreq, aead_request_flags(req),
191 NULL, NULL);
192 skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen,
193 NULL);
194
195 return crypto_skcipher_encrypt(skreq);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800196}
197
Herbert Xu3c09f172007-08-30 16:24:15 +0800198static int crypto_authenc_encrypt(struct aead_request *req)
199{
200 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800201 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800202 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800203 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
Steffen Klassert50beceb2010-03-03 22:41:08 +0800204 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7217d492016-07-12 13:17:34 +0800205 struct crypto_skcipher *enc = ctx->enc;
Herbert Xue56dd562007-12-10 16:20:24 +0800206 unsigned int cryptlen = req->cryptlen;
Herbert Xu7217d492016-07-12 13:17:34 +0800207 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
208 ictx->reqoff);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800209 struct scatterlist *src, *dst;
Herbert Xu3c09f172007-08-30 16:24:15 +0800210 int err;
211
Herbert Xu92d95ba2015-07-30 17:53:16 +0800212 src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
213 dst = src;
214
215 if (req->src != req->dst) {
216 err = crypto_authenc_copy_assoc(req);
217 if (err)
218 return err;
219
Herbert Xu92d95ba2015-07-30 17:53:16 +0800220 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
221 }
222
Herbert Xu7217d492016-07-12 13:17:34 +0800223 skcipher_request_set_tfm(skreq, enc);
224 skcipher_request_set_callback(skreq, aead_request_flags(req),
225 crypto_authenc_encrypt_done, req);
226 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
Herbert Xu3c09f172007-08-30 16:24:15 +0800227
Herbert Xu7217d492016-07-12 13:17:34 +0800228 err = crypto_skcipher_encrypt(skreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800229 if (err)
230 return err;
231
Herbert Xu92d95ba2015-07-30 17:53:16 +0800232 return crypto_authenc_genicv(req, aead_request_flags(req));
Herbert Xue56dd562007-12-10 16:20:24 +0800233}
234
Herbert Xu92d95ba2015-07-30 17:53:16 +0800235static int crypto_authenc_decrypt_tail(struct aead_request *req,
236 unsigned int flags)
Herbert Xue56dd562007-12-10 16:20:24 +0800237{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800238 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
239 struct aead_instance *inst = aead_alg_instance(authenc);
Herbert Xue56dd562007-12-10 16:20:24 +0800240 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800241 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
242 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
243 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
Herbert Xu7217d492016-07-12 13:17:34 +0800244 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
245 ictx->reqoff);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800246 unsigned int authsize = crypto_aead_authsize(authenc);
247 u8 *ihash = ahreq->result + authsize;
248 struct scatterlist *src, *dst;
Herbert Xue56dd562007-12-10 16:20:24 +0800249
Herbert Xu92d95ba2015-07-30 17:53:16 +0800250 scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0);
Herbert Xue56dd562007-12-10 16:20:24 +0800251
Herbert Xu92d95ba2015-07-30 17:53:16 +0800252 if (crypto_memneq(ihash, ahreq->result, authsize))
253 return -EBADMSG;
254
Herbert Xu92d95ba2015-07-30 17:53:16 +0800255 src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen);
256 dst = src;
257
Harsh Jainc34252f2016-06-29 00:24:43 +0530258 if (req->src != req->dst)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800259 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800260
Herbert Xu7217d492016-07-12 13:17:34 +0800261 skcipher_request_set_tfm(skreq, ctx->enc);
262 skcipher_request_set_callback(skreq, aead_request_flags(req),
263 req->base.complete, req->base.data);
264 skcipher_request_set_crypt(skreq, src, dst,
265 req->cryptlen - authsize, req->iv);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800266
Herbert Xu7217d492016-07-12 13:17:34 +0800267 return crypto_skcipher_decrypt(skreq);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800268}
269
270static void authenc_verify_ahash_done(struct crypto_async_request *areq,
271 int err)
272{
273 struct aead_request *req = areq->data;
274
Herbert Xue56dd562007-12-10 16:20:24 +0800275 if (err)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800276 goto out;
Herbert Xue56dd562007-12-10 16:20:24 +0800277
Herbert Xu92d95ba2015-07-30 17:53:16 +0800278 err = crypto_authenc_decrypt_tail(req, 0);
Herbert Xu3c09f172007-08-30 16:24:15 +0800279
Herbert Xu92d95ba2015-07-30 17:53:16 +0800280out:
281 authenc_request_complete(req, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800282}
283
284static int crypto_authenc_decrypt(struct aead_request *req)
285{
286 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu481f34a2007-12-04 20:04:21 +1100287 unsigned int authsize = crypto_aead_authsize(authenc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800288 struct aead_instance *inst = aead_alg_instance(authenc);
289 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
290 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
291 struct crypto_ahash *auth = ctx->auth;
292 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
293 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff);
294 u8 *hash = areq_ctx->tail;
Herbert Xu3c09f172007-08-30 16:24:15 +0800295 int err;
296
Herbert Xu92d95ba2015-07-30 17:53:16 +0800297 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
298 crypto_ahash_alignmask(auth) + 1);
Herbert Xu481f34a2007-12-04 20:04:21 +1100299
Herbert Xu92d95ba2015-07-30 17:53:16 +0800300 ahash_request_set_tfm(ahreq, auth);
301 ahash_request_set_crypt(ahreq, req->src, hash,
302 req->assoclen + req->cryptlen - authsize);
303 ahash_request_set_callback(ahreq, aead_request_flags(req),
304 authenc_verify_ahash_done, req);
305
306 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800307 if (err)
308 return err;
309
Herbert Xu92d95ba2015-07-30 17:53:16 +0800310 return crypto_authenc_decrypt_tail(req, aead_request_flags(req));
Herbert Xu3c09f172007-08-30 16:24:15 +0800311}
312
Herbert Xu92d95ba2015-07-30 17:53:16 +0800313static int crypto_authenc_init_tfm(struct crypto_aead *tfm)
Herbert Xu3c09f172007-08-30 16:24:15 +0800314{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800315 struct aead_instance *inst = aead_alg_instance(tfm);
316 struct authenc_instance_ctx *ictx = aead_instance_ctx(inst);
317 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000318 struct crypto_ahash *auth;
Herbert Xu7217d492016-07-12 13:17:34 +0800319 struct crypto_skcipher *enc;
320 struct crypto_skcipher *null;
Herbert Xu3c09f172007-08-30 16:24:15 +0800321 int err;
322
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000323 auth = crypto_spawn_ahash(&ictx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800324 if (IS_ERR(auth))
325 return PTR_ERR(auth);
326
Eric Biggers60425a82016-10-28 09:52:19 -0700327 enc = crypto_spawn_skcipher(&ictx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800328 err = PTR_ERR(enc);
329 if (IS_ERR(enc))
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000330 goto err_free_ahash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800331
Herbert Xu7217d492016-07-12 13:17:34 +0800332 null = crypto_get_default_null_skcipher2();
Herbert Xu92d95ba2015-07-30 17:53:16 +0800333 err = PTR_ERR(null);
334 if (IS_ERR(null))
335 goto err_free_skcipher;
336
Herbert Xu3c09f172007-08-30 16:24:15 +0800337 ctx->auth = auth;
338 ctx->enc = enc;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800339 ctx->null = null;
Richard Hartmannf3542e62010-02-16 20:27:20 +0800340
Herbert Xu92d95ba2015-07-30 17:53:16 +0800341 crypto_aead_set_reqsize(
342 tfm,
Herbert Xu25df9192015-05-11 17:47:53 +0800343 sizeof(struct authenc_request_ctx) +
Herbert Xu92d95ba2015-07-30 17:53:16 +0800344 ictx->reqoff +
Herbert Xu25df9192015-05-11 17:47:53 +0800345 max_t(unsigned int,
Herbert Xu92d95ba2015-07-30 17:53:16 +0800346 crypto_ahash_reqsize(auth) +
347 sizeof(struct ahash_request),
Herbert Xu7217d492016-07-12 13:17:34 +0800348 sizeof(struct skcipher_request) +
349 crypto_skcipher_reqsize(enc)));
Herbert Xu3c09f172007-08-30 16:24:15 +0800350
351 return 0;
352
Herbert Xu92d95ba2015-07-30 17:53:16 +0800353err_free_skcipher:
Herbert Xu7217d492016-07-12 13:17:34 +0800354 crypto_free_skcipher(enc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000355err_free_ahash:
356 crypto_free_ahash(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800357 return err;
358}
359
Herbert Xu92d95ba2015-07-30 17:53:16 +0800360static void crypto_authenc_exit_tfm(struct crypto_aead *tfm)
Herbert Xu3c09f172007-08-30 16:24:15 +0800361{
Herbert Xu92d95ba2015-07-30 17:53:16 +0800362 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm);
Herbert Xu3c09f172007-08-30 16:24:15 +0800363
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000364 crypto_free_ahash(ctx->auth);
Herbert Xu7217d492016-07-12 13:17:34 +0800365 crypto_free_skcipher(ctx->enc);
366 crypto_put_default_null_skcipher2();
Herbert Xu3c09f172007-08-30 16:24:15 +0800367}
368
Herbert Xu92d95ba2015-07-30 17:53:16 +0800369static void crypto_authenc_free(struct aead_instance *inst)
370{
371 struct authenc_instance_ctx *ctx = aead_instance_ctx(inst);
372
373 crypto_drop_skcipher(&ctx->enc);
374 crypto_drop_ahash(&ctx->auth);
375 kfree(inst);
376}
377
378static int crypto_authenc_create(struct crypto_template *tmpl,
379 struct rtattr **tb)
Herbert Xu3c09f172007-08-30 16:24:15 +0800380{
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800381 struct crypto_attr_type *algt;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800382 struct aead_instance *inst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000383 struct hash_alg_common *auth;
384 struct crypto_alg *auth_base;
Herbert Xu7217d492016-07-12 13:17:34 +0800385 struct skcipher_alg *enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800386 struct authenc_instance_ctx *ctx;
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800387 const char *enc_name;
Herbert Xu3c09f172007-08-30 16:24:15 +0800388 int err;
389
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800390 algt = crypto_get_attr_type(tb);
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800391 if (IS_ERR(algt))
Herbert Xu92d95ba2015-07-30 17:53:16 +0800392 return PTR_ERR(algt);
Herbert Xu3c09f172007-08-30 16:24:15 +0800393
Herbert Xu5e4b8c12015-08-13 17:29:06 +0800394 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
Herbert Xu92d95ba2015-07-30 17:53:16 +0800395 return -EINVAL;
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800396
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000397 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
Herbert Xu927ef322016-06-29 18:03:46 +0800398 CRYPTO_ALG_TYPE_AHASH_MASK |
399 crypto_requires_sync(algt->type, algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800400 if (IS_ERR(auth))
Herbert Xu92d95ba2015-07-30 17:53:16 +0800401 return PTR_ERR(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800402
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000403 auth_base = &auth->base;
404
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800405 enc_name = crypto_attr_alg_name(tb[2]);
406 err = PTR_ERR(enc_name);
407 if (IS_ERR(enc_name))
Herbert Xu3c09f172007-08-30 16:24:15 +0800408 goto out_put_auth;
409
Herbert Xu3c09f172007-08-30 16:24:15 +0800410 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
411 err = -ENOMEM;
412 if (!inst)
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800413 goto out_put_auth;
Herbert Xue236d4a2007-11-22 23:11:53 +0800414
Herbert Xu92d95ba2015-07-30 17:53:16 +0800415 ctx = aead_instance_ctx(inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800416
Herbert Xu92d95ba2015-07-30 17:53:16 +0800417 err = crypto_init_ahash_spawn(&ctx->auth, auth,
418 aead_crypto_instance(inst));
Herbert Xu3c09f172007-08-30 16:24:15 +0800419 if (err)
420 goto err_free_inst;
421
Herbert Xu92d95ba2015-07-30 17:53:16 +0800422 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
Eric Biggersa35528e2016-10-28 09:51:13 -0700423 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
424 crypto_requires_sync(algt->type,
425 algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800426 if (err)
427 goto err_drop_auth;
428
Herbert Xu7217d492016-07-12 13:17:34 +0800429 enc = crypto_spawn_skcipher_alg(&ctx->enc);
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800430
Herbert Xu92d95ba2015-07-30 17:53:16 +0800431 ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
432 auth_base->cra_alignmask + 1);
433
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800434 err = -ENAMETOOLONG;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800435 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
Herbert Xu7217d492016-07-12 13:17:34 +0800436 "authenc(%s,%s)", auth_base->cra_name,
437 enc->base.cra_name) >=
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800438 CRYPTO_MAX_ALG_NAME)
439 goto err_drop_enc;
440
Herbert Xu92d95ba2015-07-30 17:53:16 +0800441 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000442 "authenc(%s,%s)", auth_base->cra_driver_name,
Herbert Xu7217d492016-07-12 13:17:34 +0800443 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800444 goto err_drop_enc;
445
Herbert Xu7217d492016-07-12 13:17:34 +0800446 inst->alg.base.cra_flags = (auth_base->cra_flags |
447 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
448 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
Herbert Xu92d95ba2015-07-30 17:53:16 +0800449 auth_base->cra_priority;
Herbert Xu7217d492016-07-12 13:17:34 +0800450 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800451 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
Herbert Xu7217d492016-07-12 13:17:34 +0800452 enc->base.cra_alignmask;
Herbert Xu92d95ba2015-07-30 17:53:16 +0800453 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
Herbert Xu3c09f172007-08-30 16:24:15 +0800454
Herbert Xu7217d492016-07-12 13:17:34 +0800455 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
456 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800457 inst->alg.maxauthsize = auth->digestsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800458
Herbert Xu92d95ba2015-07-30 17:53:16 +0800459 inst->alg.init = crypto_authenc_init_tfm;
460 inst->alg.exit = crypto_authenc_exit_tfm;
Herbert Xu3c09f172007-08-30 16:24:15 +0800461
Herbert Xu92d95ba2015-07-30 17:53:16 +0800462 inst->alg.setkey = crypto_authenc_setkey;
463 inst->alg.encrypt = crypto_authenc_encrypt;
464 inst->alg.decrypt = crypto_authenc_decrypt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800465
Herbert Xu92d95ba2015-07-30 17:53:16 +0800466 inst->free = crypto_authenc_free;
467
468 err = aead_register_instance(tmpl, inst);
469 if (err)
470 goto err_drop_enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800471
472out:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000473 crypto_mod_put(auth_base);
Herbert Xu92d95ba2015-07-30 17:53:16 +0800474 return err;
Herbert Xu3c09f172007-08-30 16:24:15 +0800475
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800476err_drop_enc:
477 crypto_drop_skcipher(&ctx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800478err_drop_auth:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000479 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800480err_free_inst:
481 kfree(inst);
Herbert Xu9ffde35a2007-12-17 20:12:49 +0800482out_put_auth:
Herbert Xu3c09f172007-08-30 16:24:15 +0800483 goto out;
484}
485
Herbert Xu3c09f172007-08-30 16:24:15 +0800486static struct crypto_template crypto_authenc_tmpl = {
487 .name = "authenc",
Herbert Xu92d95ba2015-07-30 17:53:16 +0800488 .create = crypto_authenc_create,
Herbert Xu3c09f172007-08-30 16:24:15 +0800489 .module = THIS_MODULE,
490};
491
492static int __init crypto_authenc_module_init(void)
493{
494 return crypto_register_template(&crypto_authenc_tmpl);
495}
496
497static void __exit crypto_authenc_module_exit(void)
498{
499 crypto_unregister_template(&crypto_authenc_tmpl);
500}
501
502module_init(crypto_authenc_module_init);
503module_exit(crypto_authenc_module_exit);
504
505MODULE_LICENSE("GPL");
506MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
Kees Cook4943ba12014-11-24 16:32:38 -0800507MODULE_ALIAS_CRYPTO("authenc");