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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
Herbert Xu3c09f172007-08-30 16:24:15 +080055static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
56 unsigned int keylen)
57{
Herbert Xu3c09f172007-08-30 16:24:15 +080058 unsigned int authkeylen;
Herbert Xue236d4a2007-11-22 23:11:53 +080059 unsigned int enckeylen;
Herbert Xu3c09f172007-08-30 16:24:15 +080060 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +100061 struct crypto_ahash *auth = ctx->auth;
Herbert Xu3c09f172007-08-30 16:24:15 +080062 struct crypto_ablkcipher *enc = ctx->enc;
Herbert Xue236d4a2007-11-22 23:11:53 +080063 struct rtattr *rta = (void *)key;
64 struct crypto_authenc_key_param *param;
Herbert Xu3c09f172007-08-30 16:24:15 +080065 int err = -EINVAL;
66
Herbert Xu12dc5e62007-12-10 10:55:21 +080067 if (!RTA_OK(rta, keylen))
Herbert Xue236d4a2007-11-22 23:11:53 +080068 goto badkey;
69 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
70 goto badkey;
71 if (RTA_PAYLOAD(rta) < sizeof(*param))
72 goto badkey;
73
74 param = RTA_DATA(rta);
75 enckeylen = be32_to_cpu(param->enckeylen);
76
77 key += RTA_ALIGN(rta->rta_len);
78 keylen -= RTA_ALIGN(rta->rta_len);
79
80 if (keylen < enckeylen)
81 goto badkey;
82
Herbert Xu3c09f172007-08-30 16:24:15 +080083 authkeylen = keylen - enckeylen;
84
Steffen Klassertcbdcf802009-08-05 19:35:34 +100085 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
86 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
Herbert Xu3c09f172007-08-30 16:24:15 +080087 CRYPTO_TFM_REQ_MASK);
Steffen Klassertcbdcf802009-08-05 19:35:34 +100088 err = crypto_ahash_setkey(auth, key, authkeylen);
89 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
Herbert Xu3c09f172007-08-30 16:24:15 +080090 CRYPTO_TFM_RES_MASK);
91
92 if (err)
93 goto out;
94
95 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
96 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
97 CRYPTO_TFM_REQ_MASK);
98 err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
99 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
100 CRYPTO_TFM_RES_MASK);
101
102out:
103 return err;
Herbert Xue236d4a2007-11-22 23:11:53 +0800104
105badkey:
106 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
107 goto out;
Herbert Xu3c09f172007-08-30 16:24:15 +0800108}
109
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000110static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
111 int err)
112{
113 struct aead_request *req = areq->data;
114 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
115 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
116 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
117 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
118
119 if (err)
120 goto out;
121
122 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
123 areq_ctx->cryptlen);
124 ahash_request_set_callback(ahreq, aead_request_flags(req) &
125 CRYPTO_TFM_REQ_MAY_SLEEP,
126 areq_ctx->complete, req);
127
128 err = crypto_ahash_finup(ahreq);
129 if (err)
130 goto out;
131
132 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
133 areq_ctx->cryptlen,
134 crypto_aead_authsize(authenc), 1);
135
136out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800137 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000138}
139
140static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
141{
142 struct aead_request *req = areq->data;
143 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
144 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
145 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
146 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
147
148 if (err)
149 goto out;
150
151 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
152 areq_ctx->cryptlen,
153 crypto_aead_authsize(authenc), 1);
154
155out:
156 aead_request_complete(req, err);
157}
158
159static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
160 int err)
161{
162 u8 *ihash;
163 unsigned int authsize;
164 struct ablkcipher_request *abreq;
165 struct aead_request *req = areq->data;
166 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
167 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
168 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
169 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000170 unsigned int cryptlen = req->cryptlen;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000171
172 if (err)
173 goto out;
174
175 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
176 areq_ctx->cryptlen);
177 ahash_request_set_callback(ahreq, aead_request_flags(req) &
178 CRYPTO_TFM_REQ_MAY_SLEEP,
179 areq_ctx->complete, req);
180
181 err = crypto_ahash_finup(ahreq);
182 if (err)
183 goto out;
184
185 authsize = crypto_aead_authsize(authenc);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000186 cryptlen -= authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000187 ihash = ahreq->result + authsize;
188 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
189 authsize, 0);
190
Richard Hartmannf3542e62010-02-16 20:27:20 +0800191 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000192 if (err)
193 goto out;
194
195 abreq = aead_request_ctx(req);
196 ablkcipher_request_set_tfm(abreq, ctx->enc);
197 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
198 req->base.complete, req->base.data);
199 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
Shikhar Khattar921bae52010-05-20 19:40:31 +1000200 cryptlen, req->iv);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000201
202 err = crypto_ablkcipher_decrypt(abreq);
203
204out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800205 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000206}
207
208static void authenc_verify_ahash_done(struct crypto_async_request *areq,
209 int err)
210{
211 u8 *ihash;
212 unsigned int authsize;
213 struct ablkcipher_request *abreq;
214 struct aead_request *req = areq->data;
215 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
216 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
217 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
218 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000219 unsigned int cryptlen = req->cryptlen;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000220
221 if (err)
222 goto out;
223
224 authsize = crypto_aead_authsize(authenc);
Shikhar Khattar921bae52010-05-20 19:40:31 +1000225 cryptlen -= authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000226 ihash = ahreq->result + authsize;
227 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
228 authsize, 0);
229
Richard Hartmannf3542e62010-02-16 20:27:20 +0800230 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000231 if (err)
232 goto out;
233
234 abreq = aead_request_ctx(req);
235 ablkcipher_request_set_tfm(abreq, ctx->enc);
236 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
237 req->base.complete, req->base.data);
238 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
Shikhar Khattar921bae52010-05-20 19:40:31 +1000239 cryptlen, req->iv);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000240
241 err = crypto_ablkcipher_decrypt(abreq);
242
243out:
Herbert Xu180ce7e2010-04-26 09:14:05 +0800244 authenc_request_complete(req, err);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000245}
246
247static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
Herbert Xu3c09f172007-08-30 16:24:15 +0800248{
249 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Herbert Xu3c09f172007-08-30 16:24:15 +0800250 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000251 struct crypto_ahash *auth = ctx->auth;
252 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
253 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
254 u8 *hash = areq_ctx->tail;
Herbert Xu3c09f172007-08-30 16:24:15 +0800255 int err;
256
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000257 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
258 crypto_ahash_alignmask(auth) + 1);
Herbert Xu3c09f172007-08-30 16:24:15 +0800259
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000260 ahash_request_set_tfm(ahreq, auth);
261
262 err = crypto_ahash_init(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800263 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000264 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800265
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000266 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
267 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
268 areq_ctx->update_complete, req);
269
270 err = crypto_ahash_update(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800271 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000272 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800273
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000274 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
275 areq_ctx->cryptlen);
276 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
277 areq_ctx->complete, req);
278
279 err = crypto_ahash_finup(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800280 if (err)
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000281 return ERR_PTR(err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800282
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000283 return hash;
284}
Herbert Xu3c09f172007-08-30 16:24:15 +0800285
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000286static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
287{
288 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
289 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
290 struct crypto_ahash *auth = ctx->auth;
291 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
292 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
293 u8 *hash = areq_ctx->tail;
294 int err;
295
296 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
297 crypto_ahash_alignmask(auth) + 1);
298
299 ahash_request_set_tfm(ahreq, auth);
300 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
301 areq_ctx->cryptlen);
302 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
303 areq_ctx->complete, req);
304
305 err = crypto_ahash_digest(ahreq);
Herbert Xu3c09f172007-08-30 16:24:15 +0800306 if (err)
Herbert Xu7c3d7032007-12-10 16:15:41 +0800307 return ERR_PTR(err);
308
309 return hash;
310}
311
Herbert Xue56dd562007-12-10 16:20:24 +0800312static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
313 unsigned int flags)
Herbert Xu7c3d7032007-12-10 16:15:41 +0800314{
315 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000316 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800317 struct scatterlist *dst = req->dst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000318 struct scatterlist *assoc = req->assoc;
319 struct scatterlist *cipher = areq_ctx->cipher;
320 struct scatterlist *asg = areq_ctx->asg;
Herbert Xue56dd562007-12-10 16:20:24 +0800321 unsigned int ivsize = crypto_aead_ivsize(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000322 unsigned int cryptlen = req->cryptlen;
323 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
324 struct page *dstp;
Herbert Xue56dd562007-12-10 16:20:24 +0800325 u8 *vdst;
Herbert Xu7c3d7032007-12-10 16:15:41 +0800326 u8 *hash;
327
Herbert Xue56dd562007-12-10 16:20:24 +0800328 dstp = sg_page(dst);
329 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
330
Herbert Xu29b37f42009-01-13 11:26:18 +1100331 if (ivsize) {
332 sg_init_table(cipher, 2);
333 sg_set_buf(cipher, iv, ivsize);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100334 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
Herbert Xu29b37f42009-01-13 11:26:18 +1100335 dst = cipher;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000336 cryptlen += ivsize;
Herbert Xu29b37f42009-01-13 11:26:18 +1100337 }
Herbert Xue56dd562007-12-10 16:20:24 +0800338
Herbert Xu9b2f4cb2012-09-11 12:05:45 +0800339 if (req->assoclen && sg_is_last(assoc)) {
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000340 authenc_ahash_fn = crypto_authenc_ahash;
341 sg_init_table(asg, 2);
342 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100343 scatterwalk_crypto_chain(asg, dst, 0, 2);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000344 dst = asg;
345 cryptlen += req->assoclen;
346 }
347
348 areq_ctx->cryptlen = cryptlen;
349 areq_ctx->sg = dst;
350
351 areq_ctx->complete = authenc_geniv_ahash_done;
352 areq_ctx->update_complete = authenc_geniv_ahash_update_done;
353
354 hash = authenc_ahash_fn(req, flags);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800355 if (IS_ERR(hash))
356 return PTR_ERR(hash);
Herbert Xu3c09f172007-08-30 16:24:15 +0800357
Herbert Xu29b37f42009-01-13 11:26:18 +1100358 scatterwalk_map_and_copy(hash, dst, cryptlen,
Herbert Xu7ba683a2007-12-02 18:49:21 +1100359 crypto_aead_authsize(authenc), 1);
Herbert Xu3c09f172007-08-30 16:24:15 +0800360 return 0;
361}
362
363static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
364 int err)
365{
Herbert Xua6976902008-08-23 01:04:06 +1000366 struct aead_request *areq = req->data;
367
Herbert Xue56dd562007-12-10 16:20:24 +0800368 if (!err) {
Herbert Xue56dd562007-12-10 16:20:24 +0800369 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
370 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
371 struct ablkcipher_request *abreq = aead_request_ctx(areq);
372 u8 *iv = (u8 *)(abreq + 1) +
373 crypto_ablkcipher_reqsize(ctx->enc);
374
375 err = crypto_authenc_genicv(areq, iv, 0);
376 }
Herbert Xu3c09f172007-08-30 16:24:15 +0800377
Herbert Xu180ce7e2010-04-26 09:14:05 +0800378 authenc_request_complete(areq, err);
Herbert Xu3c09f172007-08-30 16:24:15 +0800379}
380
381static int crypto_authenc_encrypt(struct aead_request *req)
382{
383 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
384 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
Steffen Klassert50beceb2010-03-03 22:41:08 +0800385 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xue56dd562007-12-10 16:20:24 +0800386 struct crypto_ablkcipher *enc = ctx->enc;
387 struct scatterlist *dst = req->dst;
388 unsigned int cryptlen = req->cryptlen;
Steffen Klassert50beceb2010-03-03 22:41:08 +0800389 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
390 + ctx->reqoff);
391 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800392 int err;
393
Herbert Xue56dd562007-12-10 16:20:24 +0800394 ablkcipher_request_set_tfm(abreq, enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800395 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
396 crypto_authenc_encrypt_done, req);
Herbert Xue56dd562007-12-10 16:20:24 +0800397 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
398
399 memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
Herbert Xu3c09f172007-08-30 16:24:15 +0800400
401 err = crypto_ablkcipher_encrypt(abreq);
402 if (err)
403 return err;
404
Herbert Xue56dd562007-12-10 16:20:24 +0800405 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
406}
407
408static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
409 int err)
410{
Herbert Xua6976902008-08-23 01:04:06 +1000411 struct aead_request *areq = req->data;
412
Herbert Xue56dd562007-12-10 16:20:24 +0800413 if (!err) {
Patrick McHardy16161322008-04-29 21:44:28 +0800414 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
Herbert Xue56dd562007-12-10 16:20:24 +0800415
Patrick McHardy16161322008-04-29 21:44:28 +0800416 err = crypto_authenc_genicv(areq, greq->giv, 0);
Herbert Xue56dd562007-12-10 16:20:24 +0800417 }
418
Herbert Xu180ce7e2010-04-26 09:14:05 +0800419 authenc_request_complete(areq, err);
Herbert Xue56dd562007-12-10 16:20:24 +0800420}
421
422static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
423{
424 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
425 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
426 struct aead_request *areq = &req->areq;
427 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
428 u8 *iv = req->giv;
429 int err;
430
431 skcipher_givcrypt_set_tfm(greq, ctx->enc);
432 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
433 crypto_authenc_givencrypt_done, areq);
434 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
435 areq->iv);
436 skcipher_givcrypt_set_giv(greq, iv, req->seq);
437
438 err = crypto_skcipher_givencrypt(greq);
439 if (err)
440 return err;
441
442 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
Herbert Xu3c09f172007-08-30 16:24:15 +0800443}
444
Herbert Xu481f34a2007-12-04 20:04:21 +1100445static int crypto_authenc_verify(struct aead_request *req,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000446 authenc_ahash_t authenc_ahash_fn)
Herbert Xu3c09f172007-08-30 16:24:15 +0800447{
448 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000449 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800450 u8 *ohash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800451 u8 *ihash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800452 unsigned int authsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800453
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000454 areq_ctx->complete = authenc_verify_ahash_done;
Steffen Klassert77ba1152010-03-02 21:59:54 +0800455 areq_ctx->update_complete = authenc_verify_ahash_update_done;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000456
457 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800458 if (IS_ERR(ohash))
459 return PTR_ERR(ohash);
Herbert Xu3c09f172007-08-30 16:24:15 +0800460
Herbert Xu7ba683a2007-12-02 18:49:21 +1100461 authsize = crypto_aead_authsize(authenc);
Herbert Xu7c3d7032007-12-10 16:15:41 +0800462 ihash = ohash + authsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000463 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
464 authsize, 0);
Richard Hartmannf3542e62010-02-16 20:27:20 +0800465 return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0;
Herbert Xu3c09f172007-08-30 16:24:15 +0800466}
467
Herbert Xue56dd562007-12-10 16:20:24 +0800468static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
469 unsigned int cryptlen)
Herbert Xu3c09f172007-08-30 16:24:15 +0800470{
Herbert Xue56dd562007-12-10 16:20:24 +0800471 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000472 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
Herbert Xue56dd562007-12-10 16:20:24 +0800473 struct scatterlist *src = req->src;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000474 struct scatterlist *assoc = req->assoc;
475 struct scatterlist *cipher = areq_ctx->cipher;
476 struct scatterlist *asg = areq_ctx->asg;
Herbert Xue56dd562007-12-10 16:20:24 +0800477 unsigned int ivsize = crypto_aead_ivsize(authenc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000478 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
479 struct page *srcp;
Herbert Xue56dd562007-12-10 16:20:24 +0800480 u8 *vsrc;
481
482 srcp = sg_page(src);
483 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
484
Herbert Xu29b37f42009-01-13 11:26:18 +1100485 if (ivsize) {
486 sg_init_table(cipher, 2);
487 sg_set_buf(cipher, iv, ivsize);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100488 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
Herbert Xu29b37f42009-01-13 11:26:18 +1100489 src = cipher;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000490 cryptlen += ivsize;
Herbert Xu29b37f42009-01-13 11:26:18 +1100491 }
Herbert Xue56dd562007-12-10 16:20:24 +0800492
Herbert Xu9b2f4cb2012-09-11 12:05:45 +0800493 if (req->assoclen && sg_is_last(assoc)) {
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000494 authenc_ahash_fn = crypto_authenc_ahash;
495 sg_init_table(asg, 2);
496 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
Steffen Klassertc920fa62010-11-22 11:26:54 +0100497 scatterwalk_crypto_chain(asg, src, 0, 2);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000498 src = asg;
499 cryptlen += req->assoclen;
500 }
501
502 areq_ctx->cryptlen = cryptlen;
503 areq_ctx->sg = src;
504
505 return crypto_authenc_verify(req, authenc_ahash_fn);
Herbert Xu3c09f172007-08-30 16:24:15 +0800506}
507
508static int crypto_authenc_decrypt(struct aead_request *req)
509{
510 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
511 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
512 struct ablkcipher_request *abreq = aead_request_ctx(req);
Herbert Xu481f34a2007-12-04 20:04:21 +1100513 unsigned int cryptlen = req->cryptlen;
514 unsigned int authsize = crypto_aead_authsize(authenc);
Herbert Xue56dd562007-12-10 16:20:24 +0800515 u8 *iv = req->iv;
Herbert Xu3c09f172007-08-30 16:24:15 +0800516 int err;
517
Herbert Xu481f34a2007-12-04 20:04:21 +1100518 if (cryptlen < authsize)
519 return -EINVAL;
520 cryptlen -= authsize;
521
Herbert Xue56dd562007-12-10 16:20:24 +0800522 err = crypto_authenc_iverify(req, iv, cryptlen);
Herbert Xu3c09f172007-08-30 16:24:15 +0800523 if (err)
524 return err;
525
526 ablkcipher_request_set_tfm(abreq, ctx->enc);
527 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
Herbert Xue56dd562007-12-10 16:20:24 +0800528 req->base.complete, req->base.data);
529 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
Herbert Xu3c09f172007-08-30 16:24:15 +0800530
531 return crypto_ablkcipher_decrypt(abreq);
532}
533
534static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
535{
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000536 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
Herbert Xu3c09f172007-08-30 16:24:15 +0800537 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
538 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000539 struct crypto_ahash *auth;
Herbert Xu3c09f172007-08-30 16:24:15 +0800540 struct crypto_ablkcipher *enc;
Herbert Xu3c09f172007-08-30 16:24:15 +0800541 int err;
542
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000543 auth = crypto_spawn_ahash(&ictx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800544 if (IS_ERR(auth))
545 return PTR_ERR(auth);
546
Herbert Xu9ffde352007-12-17 20:12:49 +0800547 enc = crypto_spawn_skcipher(&ictx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800548 err = PTR_ERR(enc);
549 if (IS_ERR(enc))
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000550 goto err_free_ahash;
Herbert Xu3c09f172007-08-30 16:24:15 +0800551
552 ctx->auth = auth;
553 ctx->enc = enc;
Richard Hartmannf3542e62010-02-16 20:27:20 +0800554
Steffen Klassert50beceb2010-03-03 22:41:08 +0800555 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
556 crypto_ahash_alignmask(auth),
557 crypto_ahash_alignmask(auth) + 1) +
558 crypto_ablkcipher_ivsize(enc);
559
560 tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
561 ctx->reqoff +
562 max_t(unsigned int,
563 crypto_ahash_reqsize(auth) +
Richard Hartmannf3542e62010-02-16 20:27:20 +0800564 sizeof(struct ahash_request),
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000565 sizeof(struct skcipher_givcrypt_request) +
Steffen Klassert50beceb2010-03-03 22:41:08 +0800566 crypto_ablkcipher_reqsize(enc));
Herbert Xu3c09f172007-08-30 16:24:15 +0800567
568 return 0;
569
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000570err_free_ahash:
571 crypto_free_ahash(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800572 return err;
573}
574
575static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
576{
577 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
578
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000579 crypto_free_ahash(ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800580 crypto_free_ablkcipher(ctx->enc);
581}
582
583static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
584{
Herbert Xu9ffde352007-12-17 20:12:49 +0800585 struct crypto_attr_type *algt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800586 struct crypto_instance *inst;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000587 struct hash_alg_common *auth;
588 struct crypto_alg *auth_base;
Herbert Xu3c09f172007-08-30 16:24:15 +0800589 struct crypto_alg *enc;
590 struct authenc_instance_ctx *ctx;
Herbert Xu9ffde352007-12-17 20:12:49 +0800591 const char *enc_name;
Herbert Xu3c09f172007-08-30 16:24:15 +0800592 int err;
593
Herbert Xu9ffde352007-12-17 20:12:49 +0800594 algt = crypto_get_attr_type(tb);
Herbert Xu9ffde352007-12-17 20:12:49 +0800595 if (IS_ERR(algt))
Julia Lawall3e8afe32013-01-22 12:29:26 +0100596 return ERR_CAST(algt);
Herbert Xu3c09f172007-08-30 16:24:15 +0800597
Herbert Xu9ffde352007-12-17 20:12:49 +0800598 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
599 return ERR_PTR(-EINVAL);
600
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000601 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
602 CRYPTO_ALG_TYPE_AHASH_MASK);
Herbert Xu3c09f172007-08-30 16:24:15 +0800603 if (IS_ERR(auth))
Julia Lawall8db05072010-05-26 10:36:51 +1000604 return ERR_CAST(auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800605
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000606 auth_base = &auth->base;
607
Herbert Xu9ffde352007-12-17 20:12:49 +0800608 enc_name = crypto_attr_alg_name(tb[2]);
609 err = PTR_ERR(enc_name);
610 if (IS_ERR(enc_name))
Herbert Xu3c09f172007-08-30 16:24:15 +0800611 goto out_put_auth;
612
Herbert Xu3c09f172007-08-30 16:24:15 +0800613 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
614 err = -ENOMEM;
615 if (!inst)
Herbert Xu9ffde352007-12-17 20:12:49 +0800616 goto out_put_auth;
Herbert Xue236d4a2007-11-22 23:11:53 +0800617
Herbert Xu3c09f172007-08-30 16:24:15 +0800618 ctx = crypto_instance_ctx(inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800619
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000620 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
Herbert Xu3c09f172007-08-30 16:24:15 +0800621 if (err)
622 goto err_free_inst;
623
Herbert Xu9ffde352007-12-17 20:12:49 +0800624 crypto_set_skcipher_spawn(&ctx->enc, inst);
625 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
626 crypto_requires_sync(algt->type,
627 algt->mask));
Herbert Xu3c09f172007-08-30 16:24:15 +0800628 if (err)
629 goto err_drop_auth;
630
Herbert Xu9ffde352007-12-17 20:12:49 +0800631 enc = crypto_skcipher_spawn_alg(&ctx->enc);
632
633 err = -ENAMETOOLONG;
634 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000635 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
Herbert Xu9ffde352007-12-17 20:12:49 +0800636 CRYPTO_MAX_ALG_NAME)
637 goto err_drop_enc;
638
639 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000640 "authenc(%s,%s)", auth_base->cra_driver_name,
Herbert Xu9ffde352007-12-17 20:12:49 +0800641 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
642 goto err_drop_enc;
643
644 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
645 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000646 inst->alg.cra_priority = enc->cra_priority *
647 10 + auth_base->cra_priority;
Herbert Xu3c09f172007-08-30 16:24:15 +0800648 inst->alg.cra_blocksize = enc->cra_blocksize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000649 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
Herbert Xu3c09f172007-08-30 16:24:15 +0800650 inst->alg.cra_type = &crypto_aead_type;
651
Herbert Xuc2c61f512007-12-10 10:54:44 +0800652 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000653 inst->alg.cra_aead.maxauthsize = auth->digestsize;
Herbert Xu3c09f172007-08-30 16:24:15 +0800654
655 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
656
657 inst->alg.cra_init = crypto_authenc_init_tfm;
658 inst->alg.cra_exit = crypto_authenc_exit_tfm;
659
660 inst->alg.cra_aead.setkey = crypto_authenc_setkey;
661 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
662 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
Herbert Xue56dd562007-12-10 16:20:24 +0800663 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
Herbert Xu3c09f172007-08-30 16:24:15 +0800664
665out:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000666 crypto_mod_put(auth_base);
Herbert Xu3c09f172007-08-30 16:24:15 +0800667 return inst;
668
Herbert Xu9ffde352007-12-17 20:12:49 +0800669err_drop_enc:
670 crypto_drop_skcipher(&ctx->enc);
Herbert Xu3c09f172007-08-30 16:24:15 +0800671err_drop_auth:
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000672 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800673err_free_inst:
674 kfree(inst);
Herbert Xu9ffde352007-12-17 20:12:49 +0800675out_put_auth:
Herbert Xu3c09f172007-08-30 16:24:15 +0800676 inst = ERR_PTR(err);
677 goto out;
678}
679
680static void crypto_authenc_free(struct crypto_instance *inst)
681{
682 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
683
Herbert Xu9ffde352007-12-17 20:12:49 +0800684 crypto_drop_skcipher(&ctx->enc);
Steffen Klassertcbdcf802009-08-05 19:35:34 +1000685 crypto_drop_ahash(&ctx->auth);
Herbert Xu3c09f172007-08-30 16:24:15 +0800686 kfree(inst);
687}
688
689static struct crypto_template crypto_authenc_tmpl = {
690 .name = "authenc",
691 .alloc = crypto_authenc_alloc,
692 .free = crypto_authenc_free,
693 .module = THIS_MODULE,
694};
695
696static int __init crypto_authenc_module_init(void)
697{
698 return crypto_register_template(&crypto_authenc_tmpl);
699}
700
701static void __exit crypto_authenc_module_exit(void)
702{
703 crypto_unregister_template(&crypto_authenc_tmpl);
704}
705
706module_init(crypto_authenc_module_init);
707module_exit(crypto_authenc_module_exit);
708
709MODULE_LICENSE("GPL");
710MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");