Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 1 | /* |
| 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 Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 13 | #include <crypto/aead.h> |
Herbert Xu | 5f7082e | 2008-08-31 22:21:09 +1000 | [diff] [blame] | 14 | #include <crypto/internal/hash.h> |
Herbert Xu | 9ffde35 | 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 | 42c271c | 2007-12-07 18:52:49 +0800 | [diff] [blame] | 17 | #include <crypto/scatterwalk.h> |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 18 | #include <linux/err.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/module.h> |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 22 | #include <linux/rtnetlink.h> |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 23 | #include <linux/slab.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 26 | typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); |
| 27 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 28 | struct authenc_instance_ctx { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 29 | struct crypto_ahash_spawn auth; |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 30 | struct crypto_skcipher_spawn enc; |
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 | unsigned int reqoff; |
| 35 | struct crypto_ahash *auth; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 36 | struct crypto_ablkcipher *enc; |
| 37 | }; |
| 38 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 39 | struct 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 Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 49 | static void authenc_request_complete(struct aead_request *req, int err) |
| 50 | { |
| 51 | if (err != -EINPROGRESS) |
| 52 | aead_request_complete(req, err); |
| 53 | } |
| 54 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 55 | static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, |
| 56 | unsigned int keylen) |
| 57 | { |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 58 | unsigned int authkeylen; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 59 | unsigned int enckeylen; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 60 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 61 | struct crypto_ahash *auth = ctx->auth; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 62 | struct crypto_ablkcipher *enc = ctx->enc; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 63 | struct rtattr *rta = (void *)key; |
| 64 | struct crypto_authenc_key_param *param; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 65 | int err = -EINVAL; |
| 66 | |
Herbert Xu | 12dc5e6 | 2007-12-10 10:55:21 +0800 | [diff] [blame] | 67 | if (!RTA_OK(rta, keylen)) |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 68 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 83 | authkeylen = keylen - enckeylen; |
| 84 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 85 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
| 86 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 87 | CRYPTO_TFM_REQ_MASK); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 88 | err = crypto_ahash_setkey(auth, key, authkeylen); |
| 89 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 90 | 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 | |
| 102 | out: |
| 103 | return err; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 104 | |
| 105 | badkey: |
| 106 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| 107 | goto out; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 108 | } |
| 109 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 110 | static 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 | |
| 136 | out: |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 137 | authenc_request_complete(req, err); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static 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 | |
| 155 | out: |
| 156 | aead_request_complete(req, err); |
| 157 | } |
| 158 | |
| 159 | static 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 Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 170 | unsigned int cryptlen = req->cryptlen; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 171 | |
| 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 Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 186 | cryptlen -= authsize; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 187 | ihash = ahreq->result + authsize; |
| 188 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| 189 | authsize, 0); |
| 190 | |
Richard Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 191 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 192 | 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 Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 200 | cryptlen, req->iv); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 201 | |
| 202 | err = crypto_ablkcipher_decrypt(abreq); |
| 203 | |
| 204 | out: |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 205 | authenc_request_complete(req, err); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | static 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 Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 219 | unsigned int cryptlen = req->cryptlen; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 220 | |
| 221 | if (err) |
| 222 | goto out; |
| 223 | |
| 224 | authsize = crypto_aead_authsize(authenc); |
Shikhar Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 225 | cryptlen -= authsize; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 226 | ihash = ahreq->result + authsize; |
| 227 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| 228 | authsize, 0); |
| 229 | |
Richard Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 230 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 231 | 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 Khattar | 921bae5 | 2010-05-20 19:40:31 +1000 | [diff] [blame] | 239 | cryptlen, req->iv); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 240 | |
| 241 | err = crypto_ablkcipher_decrypt(abreq); |
| 242 | |
| 243 | out: |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 244 | authenc_request_complete(req, err); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 248 | { |
| 249 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 250 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 251 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 255 | int err; |
| 256 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 257 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
| 258 | crypto_ahash_alignmask(auth) + 1); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 259 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 260 | ahash_request_set_tfm(ahreq, auth); |
| 261 | |
| 262 | err = crypto_ahash_init(ahreq); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 263 | if (err) |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 264 | return ERR_PTR(err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 265 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 266 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 271 | if (err) |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 272 | return ERR_PTR(err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 273 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 274 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 280 | if (err) |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 281 | return ERR_PTR(err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 282 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 283 | return hash; |
| 284 | } |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 285 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 286 | static 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 306 | if (err) |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 307 | return ERR_PTR(err); |
| 308 | |
| 309 | return hash; |
| 310 | } |
| 311 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 312 | static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
| 313 | unsigned int flags) |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 314 | { |
| 315 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 316 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 317 | struct scatterlist *dst = req->dst; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 318 | struct scatterlist *assoc = req->assoc; |
| 319 | struct scatterlist *cipher = areq_ctx->cipher; |
| 320 | struct scatterlist *asg = areq_ctx->asg; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 321 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 322 | unsigned int cryptlen = req->cryptlen; |
| 323 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
| 324 | struct page *dstp; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 325 | u8 *vdst; |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 326 | u8 *hash; |
| 327 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 328 | dstp = sg_page(dst); |
| 329 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; |
| 330 | |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 331 | if (ivsize) { |
| 332 | sg_init_table(cipher, 2); |
| 333 | sg_set_buf(cipher, iv, ivsize); |
Steffen Klassert | c920fa6 | 2010-11-22 11:26:54 +0100 | [diff] [blame] | 334 | scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 335 | dst = cipher; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 336 | cryptlen += ivsize; |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 337 | } |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 338 | |
Herbert Xu | 9b2f4cb | 2012-09-11 12:05:45 +0800 | [diff] [blame] | 339 | if (req->assoclen && sg_is_last(assoc)) { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 340 | 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 Klassert | c920fa6 | 2010-11-22 11:26:54 +0100 | [diff] [blame] | 343 | scatterwalk_crypto_chain(asg, dst, 0, 2); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 344 | 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 Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 355 | if (IS_ERR(hash)) |
| 356 | return PTR_ERR(hash); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 357 | |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 358 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
Herbert Xu | 7ba683a | 2007-12-02 18:49:21 +1100 | [diff] [blame] | 359 | crypto_aead_authsize(authenc), 1); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, |
| 364 | int err) |
| 365 | { |
Herbert Xu | a697690 | 2008-08-23 01:04:06 +1000 | [diff] [blame] | 366 | struct aead_request *areq = req->data; |
| 367 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 368 | if (!err) { |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 369 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 377 | |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 378 | authenc_request_complete(areq, err); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | static 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 Klassert | 50beceb | 2010-03-03 22:41:08 +0800 | [diff] [blame] | 385 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 386 | struct crypto_ablkcipher *enc = ctx->enc; |
| 387 | struct scatterlist *dst = req->dst; |
| 388 | unsigned int cryptlen = req->cryptlen; |
Steffen Klassert | 50beceb | 2010-03-03 22:41:08 +0800 | [diff] [blame] | 389 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
| 390 | + ctx->reqoff); |
| 391 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 392 | int err; |
| 393 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 394 | ablkcipher_request_set_tfm(abreq, enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 395 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 396 | crypto_authenc_encrypt_done, req); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 397 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
| 398 | |
| 399 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 400 | |
| 401 | err = crypto_ablkcipher_encrypt(abreq); |
| 402 | if (err) |
| 403 | return err; |
| 404 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 405 | return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
| 406 | } |
| 407 | |
| 408 | static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, |
| 409 | int err) |
| 410 | { |
Herbert Xu | a697690 | 2008-08-23 01:04:06 +1000 | [diff] [blame] | 411 | struct aead_request *areq = req->data; |
| 412 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 413 | if (!err) { |
Patrick McHardy | 1616132 | 2008-04-29 21:44:28 +0800 | [diff] [blame] | 414 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 415 | |
Patrick McHardy | 1616132 | 2008-04-29 21:44:28 +0800 | [diff] [blame] | 416 | err = crypto_authenc_genicv(areq, greq->giv, 0); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 417 | } |
| 418 | |
Herbert Xu | 180ce7e | 2010-04-26 09:14:05 +0800 | [diff] [blame] | 419 | authenc_request_complete(areq, err); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | static 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 443 | } |
| 444 | |
Herbert Xu | 481f34a | 2007-12-04 20:04:21 +1100 | [diff] [blame] | 445 | static int crypto_authenc_verify(struct aead_request *req, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 446 | authenc_ahash_t authenc_ahash_fn) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 447 | { |
| 448 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 449 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 450 | u8 *ohash; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 451 | u8 *ihash; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 452 | unsigned int authsize; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 453 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 454 | areq_ctx->complete = authenc_verify_ahash_done; |
Steffen Klassert | 77ba115 | 2010-03-02 21:59:54 +0800 | [diff] [blame] | 455 | areq_ctx->update_complete = authenc_verify_ahash_update_done; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 456 | |
| 457 | ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 458 | if (IS_ERR(ohash)) |
| 459 | return PTR_ERR(ohash); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 460 | |
Herbert Xu | 7ba683a | 2007-12-02 18:49:21 +1100 | [diff] [blame] | 461 | authsize = crypto_aead_authsize(authenc); |
Herbert Xu | 7c3d703 | 2007-12-10 16:15:41 +0800 | [diff] [blame] | 462 | ihash = ohash + authsize; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 463 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
| 464 | authsize, 0); |
Richard Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 465 | return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 466 | } |
| 467 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 468 | static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
| 469 | unsigned int cryptlen) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 470 | { |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 471 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 472 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 473 | struct scatterlist *src = req->src; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 474 | struct scatterlist *assoc = req->assoc; |
| 475 | struct scatterlist *cipher = areq_ctx->cipher; |
| 476 | struct scatterlist *asg = areq_ctx->asg; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 477 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 478 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
| 479 | struct page *srcp; |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 480 | u8 *vsrc; |
| 481 | |
| 482 | srcp = sg_page(src); |
| 483 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
| 484 | |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 485 | if (ivsize) { |
| 486 | sg_init_table(cipher, 2); |
| 487 | sg_set_buf(cipher, iv, ivsize); |
Steffen Klassert | c920fa6 | 2010-11-22 11:26:54 +0100 | [diff] [blame] | 488 | scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 489 | src = cipher; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 490 | cryptlen += ivsize; |
Herbert Xu | 29b37f4 | 2009-01-13 11:26:18 +1100 | [diff] [blame] | 491 | } |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 492 | |
Herbert Xu | 9b2f4cb | 2012-09-11 12:05:45 +0800 | [diff] [blame] | 493 | if (req->assoclen && sg_is_last(assoc)) { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 494 | 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 Klassert | c920fa6 | 2010-11-22 11:26:54 +0100 | [diff] [blame] | 497 | scatterwalk_crypto_chain(asg, src, 0, 2); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 498 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | static 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 Xu | 481f34a | 2007-12-04 20:04:21 +1100 | [diff] [blame] | 513 | unsigned int cryptlen = req->cryptlen; |
| 514 | unsigned int authsize = crypto_aead_authsize(authenc); |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 515 | u8 *iv = req->iv; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 516 | int err; |
| 517 | |
Herbert Xu | 481f34a | 2007-12-04 20:04:21 +1100 | [diff] [blame] | 518 | if (cryptlen < authsize) |
| 519 | return -EINVAL; |
| 520 | cryptlen -= authsize; |
| 521 | |
Herbert Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 522 | err = crypto_authenc_iverify(req, iv, cryptlen); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 523 | 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 Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 528 | req->base.complete, req->base.data); |
| 529 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 530 | |
| 531 | return crypto_ablkcipher_decrypt(abreq); |
| 532 | } |
| 533 | |
| 534 | static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) |
| 535 | { |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 536 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 537 | struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
| 538 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 539 | struct crypto_ahash *auth; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 540 | struct crypto_ablkcipher *enc; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 541 | int err; |
| 542 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 543 | auth = crypto_spawn_ahash(&ictx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 544 | if (IS_ERR(auth)) |
| 545 | return PTR_ERR(auth); |
| 546 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 547 | enc = crypto_spawn_skcipher(&ictx->enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 548 | err = PTR_ERR(enc); |
| 549 | if (IS_ERR(enc)) |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 550 | goto err_free_ahash; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 551 | |
| 552 | ctx->auth = auth; |
| 553 | ctx->enc = enc; |
Richard Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 554 | |
Steffen Klassert | 50beceb | 2010-03-03 22:41:08 +0800 | [diff] [blame] | 555 | 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 Hartmann | f3542e6 | 2010-02-16 20:27:20 +0800 | [diff] [blame] | 564 | sizeof(struct ahash_request), |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 565 | sizeof(struct skcipher_givcrypt_request) + |
Steffen Klassert | 50beceb | 2010-03-03 22:41:08 +0800 | [diff] [blame] | 566 | crypto_ablkcipher_reqsize(enc)); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 567 | |
| 568 | return 0; |
| 569 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 570 | err_free_ahash: |
| 571 | crypto_free_ahash(auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 572 | return err; |
| 573 | } |
| 574 | |
| 575 | static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) |
| 576 | { |
| 577 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
| 578 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 579 | crypto_free_ahash(ctx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 580 | crypto_free_ablkcipher(ctx->enc); |
| 581 | } |
| 582 | |
| 583 | static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) |
| 584 | { |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 585 | struct crypto_attr_type *algt; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 586 | struct crypto_instance *inst; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 587 | struct hash_alg_common *auth; |
| 588 | struct crypto_alg *auth_base; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 589 | struct crypto_alg *enc; |
| 590 | struct authenc_instance_ctx *ctx; |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 591 | const char *enc_name; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 592 | int err; |
| 593 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 594 | algt = crypto_get_attr_type(tb); |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 595 | if (IS_ERR(algt)) |
Julia Lawall | 3e8afe3 | 2013-01-22 12:29:26 +0100 | [diff] [blame] | 596 | return ERR_CAST(algt); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 597 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 598 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 599 | return ERR_PTR(-EINVAL); |
| 600 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 601 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
| 602 | CRYPTO_ALG_TYPE_AHASH_MASK); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 603 | if (IS_ERR(auth)) |
Julia Lawall | 8db0507 | 2010-05-26 10:36:51 +1000 | [diff] [blame] | 604 | return ERR_CAST(auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 605 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 606 | auth_base = &auth->base; |
| 607 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 608 | enc_name = crypto_attr_alg_name(tb[2]); |
| 609 | err = PTR_ERR(enc_name); |
| 610 | if (IS_ERR(enc_name)) |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 611 | goto out_put_auth; |
| 612 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 613 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 614 | err = -ENOMEM; |
| 615 | if (!inst) |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 616 | goto out_put_auth; |
Herbert Xu | e236d4a | 2007-11-22 23:11:53 +0800 | [diff] [blame] | 617 | |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 618 | ctx = crypto_instance_ctx(inst); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 619 | |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 620 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 621 | if (err) |
| 622 | goto err_free_inst; |
| 623 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 624 | 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 Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 628 | if (err) |
| 629 | goto err_drop_auth; |
| 630 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 631 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
| 632 | |
| 633 | err = -ENAMETOOLONG; |
| 634 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 635 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 636 | CRYPTO_MAX_ALG_NAME) |
| 637 | goto err_drop_enc; |
| 638 | |
| 639 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 640 | "authenc(%s,%s)", auth_base->cra_driver_name, |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 641 | 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 Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 646 | inst->alg.cra_priority = enc->cra_priority * |
| 647 | 10 + auth_base->cra_priority; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 648 | inst->alg.cra_blocksize = enc->cra_blocksize; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 649 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 650 | inst->alg.cra_type = &crypto_aead_type; |
| 651 | |
Herbert Xu | c2c61f51 | 2007-12-10 10:54:44 +0800 | [diff] [blame] | 652 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 653 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 654 | |
| 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 Xu | e56dd56 | 2007-12-10 16:20:24 +0800 | [diff] [blame] | 663 | inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 664 | |
| 665 | out: |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 666 | crypto_mod_put(auth_base); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 667 | return inst; |
| 668 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 669 | err_drop_enc: |
| 670 | crypto_drop_skcipher(&ctx->enc); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 671 | err_drop_auth: |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 672 | crypto_drop_ahash(&ctx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 673 | err_free_inst: |
| 674 | kfree(inst); |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 675 | out_put_auth: |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 676 | inst = ERR_PTR(err); |
| 677 | goto out; |
| 678 | } |
| 679 | |
| 680 | static void crypto_authenc_free(struct crypto_instance *inst) |
| 681 | { |
| 682 | struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); |
| 683 | |
Herbert Xu | 9ffde35 | 2007-12-17 20:12:49 +0800 | [diff] [blame] | 684 | crypto_drop_skcipher(&ctx->enc); |
Steffen Klassert | cbdcf80 | 2009-08-05 19:35:34 +1000 | [diff] [blame] | 685 | crypto_drop_ahash(&ctx->auth); |
Herbert Xu | 3c09f17 | 2007-08-30 16:24:15 +0800 | [diff] [blame] | 686 | kfree(inst); |
| 687 | } |
| 688 | |
| 689 | static 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 | |
| 696 | static int __init crypto_authenc_module_init(void) |
| 697 | { |
| 698 | return crypto_register_template(&crypto_authenc_tmpl); |
| 699 | } |
| 700 | |
| 701 | static void __exit crypto_authenc_module_exit(void) |
| 702 | { |
| 703 | crypto_unregister_template(&crypto_authenc_tmpl); |
| 704 | } |
| 705 | |
| 706 | module_init(crypto_authenc_module_init); |
| 707 | module_exit(crypto_authenc_module_exit); |
| 708 | |
| 709 | MODULE_LICENSE("GPL"); |
| 710 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |