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Herbert Xu3c09f172007-08-30 16:24:15 +08001/*
2 * Authenc: Simple AEAD wrapper for IPsec
3 *
4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License 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 Xue56dd562007-12-10 16:20:24 +080013#include <crypto/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 Xu42c271c2007-12-07 18:52:49 +080017#include <crypto/scatterwalk.h>
Herbert Xu3c09f172007-08-30 16:24:15 +080018#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
Herbert Xue236d4a2007-11-22 23:11:53 +080022#include <linux/rtnetlink.h>
Herbert Xu3c09f172007-08-30 16:24:15 +080023#include <linux/slab.h>
24#include <linux/spinlock.h>
25
Steffen Klassertcbdcf802009-08-05 19:35:34 +100026typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
27
Herbert Xu3c09f172007-08-30 16:24:15 +080028struct authenc_instance_ctx {
Steffen Klassertcbdcf802009-08-05 19:35:34 +100029 struct crypto_ahash_spawn auth;
Herbert Xu9ffde352007-12-17 20:12:49 +080030 struct crypto_skcipher_spawn enc;
Herbert Xu3c09f172007-08-30 16:24:15 +080031};
32
33struct crypto_authenc_ctx {
Steffen Klassertcbdcf802009-08-05 19:35:34 +100034 unsigned int reqoff;
35 struct crypto_ahash *auth;
Herbert Xu3c09f172007-08-30 16:24:15 +080036 struct crypto_ablkcipher *enc;
37};
38
Steffen Klassertcbdcf802009-08-05 19:35:34 +100039struct authenc_request_ctx {
40 unsigned int cryptlen;
41 struct scatterlist *sg;
42 struct scatterlist asg[2];
43 struct scatterlist cipher[2];
44 crypto_completion_t complete;
45 crypto_completion_t update_complete;
46 char tail[];
47};
48
Herbert Xu180ce7e2010-04-26 09:14:05 +080049static void authenc_request_complete(struct aead_request *req, int err)
50{
51 if (err != -EINPROGRESS)
52 aead_request_complete(req, err);
53}
54
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020055int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key,
56 unsigned int keylen)
Herbert Xu3c09f172007-08-30 16:24:15 +080057{
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020058 struct rtattr *rta = (struct rtattr *)key;
Herbert Xue236d4a2007-11-22 23:11:53 +080059 struct crypto_authenc_key_param *param;
Herbert Xu3c09f172007-08-30 16:24:15 +080060
Herbert Xu12dc5e62007-12-10 10:55:21 +080061 if (!RTA_OK(rta, keylen))
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020062 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080063 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020064 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080065 if (RTA_PAYLOAD(rta) < sizeof(*param))
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020066 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080067
68 param = RTA_DATA(rta);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020069 keys->enckeylen = be32_to_cpu(param->enckeylen);
Herbert Xue236d4a2007-11-22 23:11:53 +080070
71 key += RTA_ALIGN(rta->rta_len);
72 keylen -= RTA_ALIGN(rta->rta_len);
73
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020074 if (keylen < keys->enckeylen)
75 return -EINVAL;
Herbert Xue236d4a2007-11-22 23:11:53 +080076
Mathias Krausebc6e2bd2013-10-15 13:49:30 +020077 keys->authkeylen = keylen - keys->enckeylen;
78 keys->authkey = key;
79 keys->enckey = key + keys->authkeylen;
80
81 return 0;
82}
83EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys);
84
85static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
86 unsigned int keylen)
87{
88 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
89 struct crypto_ahash *auth = ctx->auth;
90 struct crypto_ablkcipher *enc = ctx->enc;
91 struct crypto_authenc_keys keys;
92 int err = -EINVAL;
93
94 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
95 goto badkey;
Herbert Xu3c09f172007-08-30 16:24:15 +080096
Steffen Klassertcbdcf802009-08-05 19:35:34 +100097 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
98 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
Herbert Xu3c09f172007-08-30 16:24:15 +080099 CRYPTO_TFM_REQ_MASK);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +0200100 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000101 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
Herbert Xu3c09f172007-08-30 16:24:15 +0800102 CRYPTO_TFM_RES_MASK);
103
104 if (err)
105 goto out;
106
107 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
108 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
109 CRYPTO_TFM_REQ_MASK);
Mathias Krausebc6e2bd2013-10-15 13:49:30 +0200110 err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
Herbert Xu3c09f172007-08-30 16:24:15 +0800111 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
112 CRYPTO_TFM_RES_MASK);
113
114out:
115 return err;
Herbert Xue236d4a2007-11-22 23:11:53 +0800116
117badkey:
118 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
119 goto out;
Herbert Xu3c09f172007-08-30 16:24:15 +0800120}
121
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000122static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
123 int err)
124{
125 struct aead_request *req = areq->data;
126 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
127 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
128 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
129 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
130
131 if (err)
132 goto out;
133
134 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
135 areq_ctx->cryptlen);
136 ahash_request_set_callback(ahreq, aead_request_flags(req) &
137 CRYPTO_TFM_REQ_MAY_SLEEP,
138 areq_ctx->complete, req);
139
140 err = crypto_ahash_finup(ahreq);
141 if (err)
142 goto out;
143
144 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
145 areq_ctx->cryptlen,
146 crypto_aead_authsize(authenc), 1);
147
148out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800149 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000150}
151
152static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
153{
154 struct aead_request *req = areq->data;
155 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
156 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
157 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
158 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
159
160 if (err)
161 goto out;
162
163 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
164 areq_ctx->cryptlen,
165 crypto_aead_authsize(authenc), 1);
166
167out:
168 aead_request_complete(req, err);
169}
170
171static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
172 int err)
173{
174 u8 *ihash;
175 unsigned int authsize;
176 struct ablkcipher_request *abreq;
177 struct aead_request *req = areq->data;
178 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
179 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
180 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
181 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000182 unsigned int cryptlen = req->cryptlen;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000183
184 if (err)
185 goto out;
186
187 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
188 areq_ctx->cryptlen);
189 ahash_request_set_callback(ahreq, aead_request_flags(req) &
190 CRYPTO_TFM_REQ_MAY_SLEEP,
191 areq_ctx->complete, req);
192
193 err = crypto_ahash_finup(ahreq);
194 if (err)
195 goto out;
196
197 authsize = crypto_aead_authsize(authenc);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000198 cryptlen -= authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000199 ihash = ahreq->result + authsize;
200 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
201 authsize, 0);
202
James Yonan6bf37e52013-09-26 02:20:39 -0600203 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000204 if (err)
205 goto out;
206
207 abreq = aead_request_ctx(req);
208 ablkcipher_request_set_tfm(abreq, ctx->enc);
209 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
210 req->base.complete, req->base.data);
211 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
Shikhar Khattar921bae52010-05-20 19:40:31 +1000212 cryptlen, req->iv);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000213
214 err = crypto_ablkcipher_decrypt(abreq);
215
216out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800217 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000218}
219
220static void authenc_verify_ahash_done(struct crypto_async_request *areq,
221 int err)
222{
223 u8 *ihash;
224 unsigned int authsize;
225 struct ablkcipher_request *abreq;
226 struct aead_request *req = areq->data;
227 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
228 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
229 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
230 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000231 unsigned int cryptlen = req->cryptlen;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000232
233 if (err)
234 goto out;
235
236 authsize = crypto_aead_authsize(authenc);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000237 cryptlen -= authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000238 ihash = ahreq->result + authsize;
239 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
240 authsize, 0);
241
James Yonan6bf37e52013-09-26 02:20:39 -0600242 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000243 if (err)
244 goto out;
245
246 abreq = aead_request_ctx(req);
247 ablkcipher_request_set_tfm(abreq, ctx->enc);
248 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
249 req->base.complete, req->base.data);
250 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
Shikhar Khattar921bae52010-05-20 19:40:31 +1000251 cryptlen, req->iv);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000252
253 err = crypto_ablkcipher_decrypt(abreq);
254
255out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800256 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000257}
258
259static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
Herbert Xu3c09f172007-08-30 16:24:15 +0800260{
261 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu3c09f172007-08-30 16:24:15 +0800262 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000263 struct crypto_ahash *auth = ctx->auth;
264 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
265 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
266 u8 *hash = areq_ctx->tail;
Herbert Xu3c09f172007-08-30 16:24:15 +0800267 int err;
268
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000269 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
270 crypto_ahash_alignmask(auth) + 1);
Herbert Xu3c09f172007-08-30 16:24:15 +0800271
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000272 ahash_request_set_tfm(ahreq, auth);
273
274 err = crypto_ahash_init(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800275 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000276 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800277
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000278 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
279 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
280 areq_ctx->update_complete, req);
281
282 err = crypto_ahash_update(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800283 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000284 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800285
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000286 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
287 areq_ctx->cryptlen);
288 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
289 areq_ctx->complete, req);
290
291 err = crypto_ahash_finup(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800292 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000293 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800294
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000295 return hash;
296}
Herbert Xu3c09f172007-08-30 16:24:15 +0800297
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000298static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
299{
300 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
301 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
302 struct crypto_ahash *auth = ctx->auth;
303 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
304 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
305 u8 *hash = areq_ctx->tail;
306 int err;
307
308 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
309 crypto_ahash_alignmask(auth) + 1);
310
311 ahash_request_set_tfm(ahreq, auth);
312 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
313 areq_ctx->cryptlen);
314 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
315 areq_ctx->complete, req);
316
317 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800318 if (err)
Herbert Xu7c3d7032007-12-10 16:15:41 +0800319 return ERR_PTR(err);
320
321 return hash;
322}
323
Herbert Xue56dd562007-12-10 16:20:24 +0800324static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
325 unsigned int flags)
Herbert Xu7c3d7032007-12-10 16:15:41 +0800326{
327 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000328 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800329 struct scatterlist *dst = req->dst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000330 struct scatterlist *assoc = req->assoc;
331 struct scatterlist *cipher = areq_ctx->cipher;
332 struct scatterlist *asg = areq_ctx->asg;
Herbert Xue56dd562007-12-10 16:20:24 +0800333 unsigned int ivsize = crypto_aead_ivsize(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000334 unsigned int cryptlen = req->cryptlen;
335 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
336 struct page *dstp;
Herbert Xue56dd562007-12-10 16:20:24 +0800337 u8 *vdst;
Herbert Xu7c3d7032007-12-10 16:15:41 +0800338 u8 *hash;
339
Herbert Xue56dd562007-12-10 16:20:24 +0800340 dstp = sg_page(dst);
341 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
342
Herbert Xu29b37f42009-01-13 11:26:18 +1100343 if (ivsize) {
344 sg_init_table(cipher, 2);
345 sg_set_buf(cipher, iv, ivsize);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100346 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
Herbert Xu29b37f42009-01-13 11:26:18 +1100347 dst = cipher;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000348 cryptlen += ivsize;
Herbert Xu29b37f42009-01-13 11:26:18 +1100349 }
Herbert Xue56dd562007-12-10 16:20:24 +0800350
Herbert Xu9b2f4cb2012-09-11 12:05:45 +0800351 if (req->assoclen && sg_is_last(assoc)) {
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000352 authenc_ahash_fn = crypto_authenc_ahash;
353 sg_init_table(asg, 2);
354 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100355 scatterwalk_crypto_chain(asg, dst, 0, 2);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000356 dst = asg;
357 cryptlen += req->assoclen;
358 }
359
360 areq_ctx->cryptlen = cryptlen;
361 areq_ctx->sg = dst;
362
363 areq_ctx->complete = authenc_geniv_ahash_done;
364 areq_ctx->update_complete = authenc_geniv_ahash_update_done;
365
366 hash = authenc_ahash_fn(req, flags);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800367 if (IS_ERR(hash))
368 return PTR_ERR(hash);
Herbert Xu3c09f172007-08-30 16:24:15 +0800369
Herbert Xu29b37f42009-01-13 11:26:18 +1100370 scatterwalk_map_and_copy(hash, dst, cryptlen,
Herbert Xu7ba683a2007-12-02 18:49:21 +1100371 crypto_aead_authsize(authenc), 1);
Herbert Xu3c09f172007-08-30 16:24:15 +0800372 return 0;
373}
374
375static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
376 int err)
377{
Herbert Xua6976902008-08-23 01:04:06 +1000378 struct aead_request *areq = req->data;
379
Herbert Xue56dd562007-12-10 16:20:24 +0800380 if (!err) {
Herbert Xue56dd562007-12-10 16:20:24 +0800381 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
382 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Tom Lendackyfc019c72013-11-12 11:46:04 -0600383 struct authenc_request_ctx *areq_ctx = aead_request_ctx(areq);
384 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
385 + ctx->reqoff);
386 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(ctx->enc);
Herbert Xue56dd562007-12-10 16:20:24 +0800387
388 err = crypto_authenc_genicv(areq, iv, 0);
389 }
Herbert Xu3c09f172007-08-30 16:24:15 +0800390
Herbert Xu180ce7e2010-04-26 09:14:05 +0800391 authenc_request_complete(areq, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800392}
393
394static int crypto_authenc_encrypt(struct aead_request *req)
395{
396 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
397 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Steffen Klassert50beceb2010-03-03 22:41:08 +0800398 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xue56dd562007-12-10 16:20:24 +0800399 struct crypto_ablkcipher *enc = ctx->enc;
400 struct scatterlist *dst = req->dst;
401 unsigned int cryptlen = req->cryptlen;
Steffen Klassert50beceb2010-03-03 22:41:08 +0800402 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
403 + ctx->reqoff);
404 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800405 int err;
406
Herbert Xue56dd562007-12-10 16:20:24 +0800407 ablkcipher_request_set_tfm(abreq, enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800408 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
409 crypto_authenc_encrypt_done, req);
Herbert Xue56dd562007-12-10 16:20:24 +0800410 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
411
412 memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
Herbert Xu3c09f172007-08-30 16:24:15 +0800413
414 err = crypto_ablkcipher_encrypt(abreq);
415 if (err)
416 return err;
417
Herbert Xue56dd562007-12-10 16:20:24 +0800418 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
419}
420
421static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
422 int err)
423{
Herbert Xua6976902008-08-23 01:04:06 +1000424 struct aead_request *areq = req->data;
425
Herbert Xue56dd562007-12-10 16:20:24 +0800426 if (!err) {
Patrick McHardy16161322008-04-29 21:44:28 +0800427 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
Herbert Xue56dd562007-12-10 16:20:24 +0800428
Patrick McHardy16161322008-04-29 21:44:28 +0800429 err = crypto_authenc_genicv(areq, greq->giv, 0);
Herbert Xue56dd562007-12-10 16:20:24 +0800430 }
431
Herbert Xu180ce7e2010-04-26 09:14:05 +0800432 authenc_request_complete(areq, err);
Herbert Xue56dd562007-12-10 16:20:24 +0800433}
434
435static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
436{
437 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
438 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
439 struct aead_request *areq = &req->areq;
440 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
441 u8 *iv = req->giv;
442 int err;
443
444 skcipher_givcrypt_set_tfm(greq, ctx->enc);
445 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
446 crypto_authenc_givencrypt_done, areq);
447 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
448 areq->iv);
449 skcipher_givcrypt_set_giv(greq, iv, req->seq);
450
451 err = crypto_skcipher_givencrypt(greq);
452 if (err)
453 return err;
454
455 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
Herbert Xu3c09f172007-08-30 16:24:15 +0800456}
457
Herbert Xu481f34a2007-12-04 20:04:21 +1100458static int crypto_authenc_verify(struct aead_request *req,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000459 authenc_ahash_t authenc_ahash_fn)
Herbert Xu3c09f172007-08-30 16:24:15 +0800460{
461 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000462 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800463 u8 *ohash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800464 u8 *ihash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800465 unsigned int authsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800466
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000467 areq_ctx->complete = authenc_verify_ahash_done;
Steffen Klassert77ba1152010-03-02 21:59:54 +0800468 areq_ctx->update_complete = authenc_verify_ahash_update_done;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000469
470 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800471 if (IS_ERR(ohash))
472 return PTR_ERR(ohash);
Herbert Xu3c09f172007-08-30 16:24:15 +0800473
Herbert Xu7ba683a2007-12-02 18:49:21 +1100474 authsize = crypto_aead_authsize(authenc);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800475 ihash = ohash + authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000476 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
477 authsize, 0);
James Yonan6bf37e52013-09-26 02:20:39 -0600478 return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0;
Herbert Xu3c09f172007-08-30 16:24:15 +0800479}
480
Herbert Xue56dd562007-12-10 16:20:24 +0800481static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
482 unsigned int cryptlen)
Herbert Xu3c09f172007-08-30 16:24:15 +0800483{
Herbert Xue56dd562007-12-10 16:20:24 +0800484 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000485 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xue56dd562007-12-10 16:20:24 +0800486 struct scatterlist *src = req->src;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000487 struct scatterlist *assoc = req->assoc;
488 struct scatterlist *cipher = areq_ctx->cipher;
489 struct scatterlist *asg = areq_ctx->asg;
Herbert Xue56dd562007-12-10 16:20:24 +0800490 unsigned int ivsize = crypto_aead_ivsize(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000491 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
492 struct page *srcp;
Herbert Xue56dd562007-12-10 16:20:24 +0800493 u8 *vsrc;
494
495 srcp = sg_page(src);
496 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
497
Herbert Xu29b37f42009-01-13 11:26:18 +1100498 if (ivsize) {
499 sg_init_table(cipher, 2);
500 sg_set_buf(cipher, iv, ivsize);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100501 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
Herbert Xu29b37f42009-01-13 11:26:18 +1100502 src = cipher;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000503 cryptlen += ivsize;
Herbert Xu29b37f42009-01-13 11:26:18 +1100504 }
Herbert Xue56dd562007-12-10 16:20:24 +0800505
Herbert Xu9b2f4cb2012-09-11 12:05:45 +0800506 if (req->assoclen && sg_is_last(assoc)) {
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000507 authenc_ahash_fn = crypto_authenc_ahash;
508 sg_init_table(asg, 2);
509 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100510 scatterwalk_crypto_chain(asg, src, 0, 2);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000511 src = asg;
512 cryptlen += req->assoclen;
513 }
514
515 areq_ctx->cryptlen = cryptlen;
516 areq_ctx->sg = src;
517
518 return crypto_authenc_verify(req, authenc_ahash_fn);
Herbert Xu3c09f172007-08-30 16:24:15 +0800519}
520
521static int crypto_authenc_decrypt(struct aead_request *req)
522{
523 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
524 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
525 struct ablkcipher_request *abreq = aead_request_ctx(req);
Herbert Xu481f34a2007-12-04 20:04:21 +1100526 unsigned int cryptlen = req->cryptlen;
527 unsigned int authsize = crypto_aead_authsize(authenc);
Herbert Xue56dd562007-12-10 16:20:24 +0800528 u8 *iv = req->iv;
Herbert Xu3c09f172007-08-30 16:24:15 +0800529 int err;
530
Herbert Xu481f34a2007-12-04 20:04:21 +1100531 if (cryptlen < authsize)
532 return -EINVAL;
533 cryptlen -= authsize;
534
Herbert Xue56dd562007-12-10 16:20:24 +0800535 err = crypto_authenc_iverify(req, iv, cryptlen);
Herbert Xu3c09f172007-08-30 16:24:15 +0800536 if (err)
537 return err;
538
539 ablkcipher_request_set_tfm(abreq, ctx->enc);
540 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
Herbert Xue56dd562007-12-10 16:20:24 +0800541 req->base.complete, req->base.data);
542 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
Herbert Xu3c09f172007-08-30 16:24:15 +0800543
544 return crypto_ablkcipher_decrypt(abreq);
545}
546
547static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
548{
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000549 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
Herbert Xu3c09f172007-08-30 16:24:15 +0800550 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
551 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000552 struct crypto_ahash *auth;
Herbert Xu3c09f172007-08-30 16:24:15 +0800553 struct crypto_ablkcipher *enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800554 int err;
555
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000556 auth = crypto_spawn_ahash(&ictx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800557 if (IS_ERR(auth))
558 return PTR_ERR(auth);
559
Herbert Xu9ffde352007-12-17 20:12:49 +0800560 enc = crypto_spawn_skcipher(&ictx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800561 err = PTR_ERR(enc);
562 if (IS_ERR(enc))
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000563 goto err_free_ahash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800564
565 ctx->auth = auth;
566 ctx->enc = enc;
Richard Hartmannf3542e62010-02-16 20:27:20 +0800567
Steffen Klassert50beceb2010-03-03 22:41:08 +0800568 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
569 crypto_ahash_alignmask(auth),
570 crypto_ahash_alignmask(auth) + 1) +
571 crypto_ablkcipher_ivsize(enc);
572
573 tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
574 ctx->reqoff +
575 max_t(unsigned int,
576 crypto_ahash_reqsize(auth) +
Richard Hartmannf3542e62010-02-16 20:27:20 +0800577 sizeof(struct ahash_request),
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000578 sizeof(struct skcipher_givcrypt_request) +
Steffen Klassert50beceb2010-03-03 22:41:08 +0800579 crypto_ablkcipher_reqsize(enc));
Herbert Xu3c09f172007-08-30 16:24:15 +0800580
581 return 0;
582
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000583err_free_ahash:
584 crypto_free_ahash(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800585 return err;
586}
587
588static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
589{
590 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
591
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000592 crypto_free_ahash(ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800593 crypto_free_ablkcipher(ctx->enc);
594}
595
596static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
597{
Herbert Xu9ffde352007-12-17 20:12:49 +0800598 struct crypto_attr_type *algt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800599 struct crypto_instance *inst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000600 struct hash_alg_common *auth;
601 struct crypto_alg *auth_base;
Herbert Xu3c09f172007-08-30 16:24:15 +0800602 struct crypto_alg *enc;
603 struct authenc_instance_ctx *ctx;
Herbert Xu9ffde352007-12-17 20:12:49 +0800604 const char *enc_name;
Herbert Xu3c09f172007-08-30 16:24:15 +0800605 int err;
606
Herbert Xu9ffde352007-12-17 20:12:49 +0800607 algt = crypto_get_attr_type(tb);
Herbert Xu9ffde352007-12-17 20:12:49 +0800608 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100609 return ERR_CAST(algt);
Herbert Xu3c09f172007-08-30 16:24:15 +0800610
Herbert Xu9ffde352007-12-17 20:12:49 +0800611 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
612 return ERR_PTR(-EINVAL);
613
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000614 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
615 CRYPTO_ALG_TYPE_AHASH_MASK);
Herbert Xu3c09f172007-08-30 16:24:15 +0800616 if (IS_ERR(auth))
Julia Lawall8db05072010-05-26 10:36:51 +1000617 return ERR_CAST(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800618
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000619 auth_base = &auth->base;
620
Herbert Xu9ffde352007-12-17 20:12:49 +0800621 enc_name = crypto_attr_alg_name(tb[2]);
622 err = PTR_ERR(enc_name);
623 if (IS_ERR(enc_name))
Herbert Xu3c09f172007-08-30 16:24:15 +0800624 goto out_put_auth;
625
Herbert Xu3c09f172007-08-30 16:24:15 +0800626 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
627 err = -ENOMEM;
628 if (!inst)
Herbert Xu9ffde352007-12-17 20:12:49 +0800629 goto out_put_auth;
Herbert Xue236d4a2007-11-22 23:11:53 +0800630
Herbert Xu3c09f172007-08-30 16:24:15 +0800631 ctx = crypto_instance_ctx(inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800632
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000633 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800634 if (err)
635 goto err_free_inst;
636
Herbert Xu9ffde352007-12-17 20:12:49 +0800637 crypto_set_skcipher_spawn(&ctx->enc, inst);
638 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
639 crypto_requires_sync(algt->type,
640 algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800641 if (err)
642 goto err_drop_auth;
643
Herbert Xu9ffde352007-12-17 20:12:49 +0800644 enc = crypto_skcipher_spawn_alg(&ctx->enc);
645
646 err = -ENAMETOOLONG;
647 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000648 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
Herbert Xu9ffde352007-12-17 20:12:49 +0800649 CRYPTO_MAX_ALG_NAME)
650 goto err_drop_enc;
651
652 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000653 "authenc(%s,%s)", auth_base->cra_driver_name,
Herbert Xu9ffde352007-12-17 20:12:49 +0800654 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
655 goto err_drop_enc;
656
657 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
658 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000659 inst->alg.cra_priority = enc->cra_priority *
660 10 + auth_base->cra_priority;
Herbert Xu3c09f172007-08-30 16:24:15 +0800661 inst->alg.cra_blocksize = enc->cra_blocksize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000662 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
Herbert Xu3c09f172007-08-30 16:24:15 +0800663 inst->alg.cra_type = &crypto_aead_type;
664
Herbert Xuc2c61f512007-12-10 10:54:44 +0800665 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000666 inst->alg.cra_aead.maxauthsize = auth->digestsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800667
668 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
669
670 inst->alg.cra_init = crypto_authenc_init_tfm;
671 inst->alg.cra_exit = crypto_authenc_exit_tfm;
672
673 inst->alg.cra_aead.setkey = crypto_authenc_setkey;
674 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
675 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
Herbert Xue56dd562007-12-10 16:20:24 +0800676 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800677
678out:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000679 crypto_mod_put(auth_base);
Herbert Xu3c09f172007-08-30 16:24:15 +0800680 return inst;
681
Herbert Xu9ffde352007-12-17 20:12:49 +0800682err_drop_enc:
683 crypto_drop_skcipher(&ctx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800684err_drop_auth:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000685 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800686err_free_inst:
687 kfree(inst);
Herbert Xu9ffde352007-12-17 20:12:49 +0800688out_put_auth:
Herbert Xu3c09f172007-08-30 16:24:15 +0800689 inst = ERR_PTR(err);
690 goto out;
691}
692
693static void crypto_authenc_free(struct crypto_instance *inst)
694{
695 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
696
Herbert Xu9ffde352007-12-17 20:12:49 +0800697 crypto_drop_skcipher(&ctx->enc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000698 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800699 kfree(inst);
700}
701
702static struct crypto_template crypto_authenc_tmpl = {
703 .name = "authenc",
704 .alloc = crypto_authenc_alloc,
705 .free = crypto_authenc_free,
706 .module = THIS_MODULE,
707};
708
709static int __init crypto_authenc_module_init(void)
710{
711 return crypto_register_template(&crypto_authenc_tmpl);
712}
713
714static void __exit crypto_authenc_module_exit(void)
715{
716 crypto_unregister_template(&crypto_authenc_tmpl);
717}
718
719module_init(crypto_authenc_module_init);
720module_exit(crypto_authenc_module_exit);
721
722MODULE_LICENSE("GPL");
723MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
Kees Cook4943ba12014-11-24 16:32:38 -0800724MODULE_ALIAS_CRYPTO("authenc");