Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Authenc: Simple AEAD wrapper for IPsec |
| 3 | * |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 4 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 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 Xu | 68acbf8 | 2015-05-11 17:47:41 +0800 | [diff] [blame] | 13 | #include <crypto/internal/aead.h> |
Herbert Xu | 5f7082e | 2008-08-31 22:21:09 +1000 | [diff] [blame] | 14 | #include <crypto/internal/hash.h> |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 15 | #include <crypto/internal/skcipher.h> |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 16 | #include <crypto/authenc.h> |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 17 | #include <crypto/null.h> |
Herbert Xu | 42c271c | 2007-12-07 18:52:49 +0800 | [diff] [blame] | 18 | #include <crypto/scatterwalk.h> |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 19 | #include <linux/err.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 23 | #include <linux/rtnetlink.h> |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 24 | #include <linux/slab.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 27 | struct authenc_instance_ctx { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 28 | struct crypto_ahash_spawn auth; |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 29 | struct crypto_skcipher_spawn enc; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 30 | unsigned int reqoff; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 31 | }; |
| 32 | |
| 33 | struct crypto_authenc_ctx { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 34 | struct crypto_ahash *auth; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 35 | struct crypto_ablkcipher *enc; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 36 | struct crypto_blkcipher *null; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 37 | }; |
| 38 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 39 | struct authenc_request_ctx { |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 40 | struct scatterlist src[2]; |
| 41 | struct scatterlist dst[2]; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 42 | char tail[]; |
| 43 | }; |
| 44 | |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 45 | static void authenc_request_complete(struct aead_request *req, int err) |
| 46 | { |
| 47 | if (err != -EINPROGRESS) |
| 48 | aead_request_complete(req, err); |
| 49 | } |
| 50 | |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 51 | int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, |
| 52 | unsigned int keylen) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 53 | { |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 54 | struct rtattr *rta = (struct rtattr *)key; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 55 | struct crypto_authenc_key_param *param; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 56 | |
Herbert Xu | 12dc5e6 | 2007-12-10 10:55:21 +0800 | [diff] [blame] | 57 | if (!RTA_OK(rta, keylen)) |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 58 | return -EINVAL; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 59 | if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 60 | return -EINVAL; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 61 | if (RTA_PAYLOAD(rta) < sizeof(*param)) |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 62 | return -EINVAL; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 63 | |
| 64 | param = RTA_DATA(rta); |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 65 | keys->enckeylen = be32_to_cpu(param->enckeylen); |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 66 | |
| 67 | key += RTA_ALIGN(rta->rta_len); |
| 68 | keylen -= RTA_ALIGN(rta->rta_len); |
| 69 | |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 70 | if (keylen < keys->enckeylen) |
| 71 | return -EINVAL; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 72 | |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 73 | keys->authkeylen = keylen - keys->enckeylen; |
| 74 | keys->authkey = key; |
| 75 | keys->enckey = key + keys->authkeylen; |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); |
| 80 | |
| 81 | static 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; |
| 86 | struct crypto_ablkcipher *enc = ctx->enc; |
| 87 | struct crypto_authenc_keys keys; |
| 88 | int err = -EINVAL; |
| 89 | |
| 90 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
| 91 | goto badkey; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 92 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 93 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
| 94 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 95 | CRYPTO_TFM_REQ_MASK); |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 96 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 97 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 98 | CRYPTO_TFM_RES_MASK); |
| 99 | |
| 100 | if (err) |
| 101 | goto out; |
| 102 | |
| 103 | crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
| 104 | crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) & |
| 105 | CRYPTO_TFM_REQ_MASK); |
Mathias Krause | bc6e2bd | 2013-10-15 13:49:30 +0200 | [diff] [blame] | 106 | err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 107 | crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & |
| 108 | CRYPTO_TFM_RES_MASK); |
| 109 | |
| 110 | out: |
| 111 | return err; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 112 | |
| 113 | badkey: |
| 114 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| 115 | goto out; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 116 | } |
| 117 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 118 | static 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 Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 122 | struct aead_instance *inst = aead_alg_instance(authenc); |
| 123 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 124 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 125 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 126 | |
| 127 | if (err) |
| 128 | goto out; |
| 129 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 130 | scatterwalk_map_and_copy(ahreq->result, req->dst, |
| 131 | req->assoclen + req->cryptlen, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 132 | crypto_aead_authsize(authenc), 1); |
| 133 | |
| 134 | out: |
| 135 | aead_request_complete(req, err); |
| 136 | } |
| 137 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 138 | static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 139 | { |
| 140 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 141 | struct aead_instance *inst = aead_alg_instance(authenc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 142 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 143 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 144 | struct crypto_ahash *auth = ctx->auth; |
| 145 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 146 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 147 | 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 Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 154 | 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 Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 158 | |
| 159 | err = crypto_ahash_digest(ahreq); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 160 | if (err) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 161 | return err; |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 162 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 163 | scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen, |
Herbert Xu | 7ba683a | 2007-12-02 18:49:21 +1100 | [diff] [blame] | 164 | crypto_aead_authsize(authenc), 1); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 165 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, |
| 170 | int err) |
| 171 | { |
Herbert Xu | a697690 | 2008-08-23 01:04:06 +1000 | [diff] [blame] | 172 | struct aead_request *areq = req->data; |
| 173 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 174 | if (err) |
| 175 | goto out; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 176 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 177 | err = crypto_authenc_genicv(areq, 0); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 178 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 179 | out: |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 180 | authenc_request_complete(areq, err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 181 | } |
| 182 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 183 | static 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); |
| 187 | struct blkcipher_desc desc = { |
| 188 | .tfm = ctx->null, |
| 189 | }; |
| 190 | |
| 191 | return crypto_blkcipher_encrypt(&desc, req->dst, req->src, |
| 192 | req->assoclen); |
| 193 | } |
| 194 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 195 | static int crypto_authenc_encrypt(struct aead_request *req) |
| 196 | { |
| 197 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 198 | struct aead_instance *inst = aead_alg_instance(authenc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 199 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 200 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
Steffen Klassert | 50beceb | 2010-03-03 22:41:08 +0800 | [diff] [blame] | 201 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 202 | struct crypto_ablkcipher *enc = ctx->enc; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 203 | unsigned int cryptlen = req->cryptlen; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 204 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail + |
| 205 | ictx->reqoff); |
| 206 | struct scatterlist *src, *dst; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 207 | int err; |
| 208 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 209 | src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); |
| 210 | dst = src; |
| 211 | |
| 212 | if (req->src != req->dst) { |
| 213 | err = crypto_authenc_copy_assoc(req); |
| 214 | if (err) |
| 215 | return err; |
| 216 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 217 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); |
| 218 | } |
| 219 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 220 | ablkcipher_request_set_tfm(abreq, enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 221 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 222 | crypto_authenc_encrypt_done, req); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 223 | ablkcipher_request_set_crypt(abreq, src, dst, cryptlen, req->iv); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 224 | |
| 225 | err = crypto_ablkcipher_encrypt(abreq); |
| 226 | if (err) |
| 227 | return err; |
| 228 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 229 | return crypto_authenc_genicv(req, aead_request_flags(req)); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 230 | } |
| 231 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 232 | static int crypto_authenc_decrypt_tail(struct aead_request *req, |
| 233 | unsigned int flags) |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 234 | { |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 235 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
| 236 | struct aead_instance *inst = aead_alg_instance(authenc); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 237 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 238 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
| 239 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| 240 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
| 241 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail + |
| 242 | ictx->reqoff); |
| 243 | unsigned int authsize = crypto_aead_authsize(authenc); |
| 244 | u8 *ihash = ahreq->result + authsize; |
| 245 | struct scatterlist *src, *dst; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 246 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 247 | scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 248 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 249 | if (crypto_memneq(ihash, ahreq->result, authsize)) |
| 250 | return -EBADMSG; |
| 251 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 252 | src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); |
| 253 | dst = src; |
| 254 | |
Harsh Jain | c34252f | 2016-06-29 00:24:43 +0530 | [diff] [blame] | 255 | if (req->src != req->dst) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 256 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 257 | |
| 258 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
| 259 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 260 | req->base.complete, req->base.data); |
| 261 | ablkcipher_request_set_crypt(abreq, src, dst, |
| 262 | req->cryptlen - authsize, req->iv); |
| 263 | |
| 264 | return crypto_ablkcipher_decrypt(abreq); |
| 265 | } |
| 266 | |
| 267 | static void authenc_verify_ahash_done(struct crypto_async_request *areq, |
| 268 | int err) |
| 269 | { |
| 270 | struct aead_request *req = areq->data; |
| 271 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 272 | if (err) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 273 | goto out; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 274 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 275 | err = crypto_authenc_decrypt_tail(req, 0); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 276 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 277 | out: |
| 278 | authenc_request_complete(req, err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | static int crypto_authenc_decrypt(struct aead_request *req) |
| 282 | { |
| 283 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Herbert Xu | 481f34a | 2007-12-04 20:04:21 +1100 | [diff] [blame] | 284 | unsigned int authsize = crypto_aead_authsize(authenc); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 285 | struct aead_instance *inst = aead_alg_instance(authenc); |
| 286 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
| 287 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
| 288 | struct crypto_ahash *auth = ctx->auth; |
| 289 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
| 290 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
| 291 | u8 *hash = areq_ctx->tail; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 292 | int err; |
| 293 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 294 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
| 295 | crypto_ahash_alignmask(auth) + 1); |
Herbert Xu | 481f34a | 2007-12-04 20:04:21 +1100 | [diff] [blame] | 296 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 297 | ahash_request_set_tfm(ahreq, auth); |
| 298 | ahash_request_set_crypt(ahreq, req->src, hash, |
| 299 | req->assoclen + req->cryptlen - authsize); |
| 300 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 301 | authenc_verify_ahash_done, req); |
| 302 | |
| 303 | err = crypto_ahash_digest(ahreq); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 304 | if (err) |
| 305 | return err; |
| 306 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 307 | return crypto_authenc_decrypt_tail(req, aead_request_flags(req)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 308 | } |
| 309 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 310 | static int crypto_authenc_init_tfm(struct crypto_aead *tfm) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 311 | { |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 312 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 313 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
| 314 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 315 | struct crypto_ahash *auth; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 316 | struct crypto_ablkcipher *enc; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 317 | struct crypto_blkcipher *null; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 318 | int err; |
| 319 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 320 | auth = crypto_spawn_ahash(&ictx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 321 | if (IS_ERR(auth)) |
| 322 | return PTR_ERR(auth); |
| 323 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 324 | enc = crypto_spawn_skcipher(&ictx->enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 325 | err = PTR_ERR(enc); |
| 326 | if (IS_ERR(enc)) |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 327 | goto err_free_ahash; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 328 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 329 | null = crypto_get_default_null_skcipher(); |
| 330 | err = PTR_ERR(null); |
| 331 | if (IS_ERR(null)) |
| 332 | goto err_free_skcipher; |
| 333 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 334 | ctx->auth = auth; |
| 335 | ctx->enc = enc; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 336 | ctx->null = null; |
Richard Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 337 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 338 | crypto_aead_set_reqsize( |
| 339 | tfm, |
Herbert Xu | 25df919 | 2015-05-11 17:47:53 +0800 | [diff] [blame] | 340 | sizeof(struct authenc_request_ctx) + |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 341 | ictx->reqoff + |
Herbert Xu | 25df919 | 2015-05-11 17:47:53 +0800 | [diff] [blame] | 342 | max_t(unsigned int, |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 343 | crypto_ahash_reqsize(auth) + |
| 344 | sizeof(struct ahash_request), |
| 345 | sizeof(struct ablkcipher_request) + |
| 346 | crypto_ablkcipher_reqsize(enc))); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 347 | |
| 348 | return 0; |
| 349 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 350 | err_free_skcipher: |
| 351 | crypto_free_ablkcipher(enc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 352 | err_free_ahash: |
| 353 | crypto_free_ahash(auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 354 | return err; |
| 355 | } |
| 356 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 357 | static void crypto_authenc_exit_tfm(struct crypto_aead *tfm) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 358 | { |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 359 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 360 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 361 | crypto_free_ahash(ctx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 362 | crypto_free_ablkcipher(ctx->enc); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 363 | crypto_put_default_null_skcipher(); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 364 | } |
| 365 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 366 | static void crypto_authenc_free(struct aead_instance *inst) |
| 367 | { |
| 368 | struct authenc_instance_ctx *ctx = aead_instance_ctx(inst); |
| 369 | |
| 370 | crypto_drop_skcipher(&ctx->enc); |
| 371 | crypto_drop_ahash(&ctx->auth); |
| 372 | kfree(inst); |
| 373 | } |
| 374 | |
| 375 | static int crypto_authenc_create(struct crypto_template *tmpl, |
| 376 | struct rtattr **tb) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 377 | { |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 378 | struct crypto_attr_type *algt; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 379 | struct aead_instance *inst; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 380 | struct hash_alg_common *auth; |
| 381 | struct crypto_alg *auth_base; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 382 | struct crypto_alg *enc; |
| 383 | struct authenc_instance_ctx *ctx; |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 384 | const char *enc_name; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 385 | int err; |
| 386 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 387 | algt = crypto_get_attr_type(tb); |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 388 | if (IS_ERR(algt)) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 389 | return PTR_ERR(algt); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 390 | |
Herbert Xu | 5e4b8c1 | 2015-08-13 17:29:06 +0800 | [diff] [blame] | 391 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 392 | return -EINVAL; |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 393 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 394 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
Herbert Xu | 927ef32 | 2016-06-29 18:03:46 +0800 | [diff] [blame^] | 395 | CRYPTO_ALG_TYPE_AHASH_MASK | |
| 396 | crypto_requires_sync(algt->type, algt->mask)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 397 | if (IS_ERR(auth)) |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 398 | return PTR_ERR(auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 399 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 400 | auth_base = &auth->base; |
| 401 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 402 | enc_name = crypto_attr_alg_name(tb[2]); |
| 403 | err = PTR_ERR(enc_name); |
| 404 | if (IS_ERR(enc_name)) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 405 | goto out_put_auth; |
| 406 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 407 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 408 | err = -ENOMEM; |
| 409 | if (!inst) |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 410 | goto out_put_auth; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 411 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 412 | ctx = aead_instance_ctx(inst); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 413 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 414 | err = crypto_init_ahash_spawn(&ctx->auth, auth, |
| 415 | aead_crypto_instance(inst)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 416 | if (err) |
| 417 | goto err_free_inst; |
| 418 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 419 | crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 420 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
| 421 | crypto_requires_sync(algt->type, |
| 422 | algt->mask)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 423 | if (err) |
| 424 | goto err_drop_auth; |
| 425 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 426 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
| 427 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 428 | ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask, |
| 429 | auth_base->cra_alignmask + 1); |
| 430 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 431 | err = -ENAMETOOLONG; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 432 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 433 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 434 | CRYPTO_MAX_ALG_NAME) |
| 435 | goto err_drop_enc; |
| 436 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 437 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 438 | "authenc(%s,%s)", auth_base->cra_driver_name, |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 439 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| 440 | goto err_drop_enc; |
| 441 | |
Herbert Xu | 927ef32 | 2016-06-29 18:03:46 +0800 | [diff] [blame^] | 442 | inst->alg.base.cra_flags = (auth_base->cra_flags | enc->cra_flags) & |
| 443 | CRYPTO_ALG_ASYNC; |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 444 | inst->alg.base.cra_priority = enc->cra_priority * 10 + |
| 445 | auth_base->cra_priority; |
| 446 | inst->alg.base.cra_blocksize = enc->cra_blocksize; |
| 447 | inst->alg.base.cra_alignmask = auth_base->cra_alignmask | |
| 448 | enc->cra_alignmask; |
| 449 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 450 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 451 | inst->alg.ivsize = enc->cra_ablkcipher.ivsize; |
| 452 | inst->alg.maxauthsize = auth->digestsize; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 453 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 454 | inst->alg.init = crypto_authenc_init_tfm; |
| 455 | inst->alg.exit = crypto_authenc_exit_tfm; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 456 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 457 | inst->alg.setkey = crypto_authenc_setkey; |
| 458 | inst->alg.encrypt = crypto_authenc_encrypt; |
| 459 | inst->alg.decrypt = crypto_authenc_decrypt; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 460 | |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 461 | inst->free = crypto_authenc_free; |
| 462 | |
| 463 | err = aead_register_instance(tmpl, inst); |
| 464 | if (err) |
| 465 | goto err_drop_enc; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 466 | |
| 467 | out: |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 468 | crypto_mod_put(auth_base); |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 469 | return err; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 470 | |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 471 | err_drop_enc: |
| 472 | crypto_drop_skcipher(&ctx->enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 473 | err_drop_auth: |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 474 | crypto_drop_ahash(&ctx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 475 | err_free_inst: |
| 476 | kfree(inst); |
Herbert Xu | 9ffde35a | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 477 | out_put_auth: |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 478 | goto out; |
| 479 | } |
| 480 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 481 | static struct crypto_template crypto_authenc_tmpl = { |
| 482 | .name = "authenc", |
Herbert Xu | 92d95ba | 2015-07-30 17:53:16 +0800 | [diff] [blame] | 483 | .create = crypto_authenc_create, |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 484 | .module = THIS_MODULE, |
| 485 | }; |
| 486 | |
| 487 | static int __init crypto_authenc_module_init(void) |
| 488 | { |
| 489 | return crypto_register_template(&crypto_authenc_tmpl); |
| 490 | } |
| 491 | |
| 492 | static void __exit crypto_authenc_module_exit(void) |
| 493 | { |
| 494 | crypto_unregister_template(&crypto_authenc_tmpl); |
| 495 | } |
| 496 | |
| 497 | module_init(crypto_authenc_module_init); |
| 498 | module_exit(crypto_authenc_module_exit); |
| 499 | |
| 500 | MODULE_LICENSE("GPL"); |
| 501 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |
Kees Cook | 4943ba1 | 2014-11-24 16:32:38 -0800 | [diff] [blame] | 502 | MODULE_ALIAS_CRYPTO("authenc"); |