Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 1 | /* |
| 2 | * echainiv: Encrypted Chain IV Generator |
| 3 | * |
| 4 | * This generator generates an IV based on a sequence number by xoring it |
| 5 | * with a salt and then encrypting it with the same key as used to encrypt |
| 6 | * the plain text. This algorithm requires that the block size be equal |
| 7 | * to the IV size. It is mainly useful for CBC. |
| 8 | * |
| 9 | * This generator can only be used by algorithms where authentication |
| 10 | * is performed after encryption (i.e., authenc). |
| 11 | * |
| 12 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify it |
| 15 | * under the terms of the GNU General Public License as published by the Free |
| 16 | * Software Foundation; either version 2 of the License, or (at your option) |
| 17 | * any later version. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <crypto/internal/aead.h> |
| 22 | #include <crypto/null.h> |
| 23 | #include <crypto/rng.h> |
| 24 | #include <crypto/scatterwalk.h> |
| 25 | #include <linux/err.h> |
| 26 | #include <linux/init.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/mm.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/percpu.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/string.h> |
| 33 | |
| 34 | #define MAX_IV_SIZE 16 |
| 35 | |
| 36 | struct echainiv_request_ctx { |
| 37 | struct scatterlist src[2]; |
| 38 | struct scatterlist dst[2]; |
| 39 | struct scatterlist ivbuf[2]; |
| 40 | struct scatterlist *ivsg; |
| 41 | struct aead_givcrypt_request subreq; |
| 42 | }; |
| 43 | |
| 44 | struct echainiv_ctx { |
| 45 | struct crypto_aead *child; |
| 46 | spinlock_t lock; |
| 47 | struct crypto_blkcipher *null; |
| 48 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); |
| 49 | }; |
| 50 | |
| 51 | static DEFINE_PER_CPU(u32 [MAX_IV_SIZE / sizeof(u32)], echainiv_iv); |
| 52 | |
| 53 | static int echainiv_setkey(struct crypto_aead *tfm, |
| 54 | const u8 *key, unsigned int keylen) |
| 55 | { |
| 56 | struct echainiv_ctx *ctx = crypto_aead_ctx(tfm); |
| 57 | |
| 58 | return crypto_aead_setkey(ctx->child, key, keylen); |
| 59 | } |
| 60 | |
| 61 | static int echainiv_setauthsize(struct crypto_aead *tfm, |
| 62 | unsigned int authsize) |
| 63 | { |
| 64 | struct echainiv_ctx *ctx = crypto_aead_ctx(tfm); |
| 65 | |
| 66 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 67 | } |
| 68 | |
| 69 | /* We don't care if we get preempted and read/write IVs from the next CPU. */ |
Wu Fengguang | 622ff87 | 2015-05-23 11:22:47 +0800 | [diff] [blame] | 70 | static void echainiv_read_iv(u8 *dst, unsigned size) |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 71 | { |
| 72 | u32 *a = (u32 *)dst; |
| 73 | u32 __percpu *b = echainiv_iv; |
| 74 | |
| 75 | for (; size >= 4; size -= 4) { |
| 76 | *a++ = this_cpu_read(*b); |
| 77 | b++; |
| 78 | } |
| 79 | } |
| 80 | |
Wu Fengguang | 622ff87 | 2015-05-23 11:22:47 +0800 | [diff] [blame] | 81 | static void echainiv_write_iv(const u8 *src, unsigned size) |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 82 | { |
| 83 | const u32 *a = (const u32 *)src; |
| 84 | u32 __percpu *b = echainiv_iv; |
| 85 | |
| 86 | for (; size >= 4; size -= 4) { |
| 87 | this_cpu_write(*b, *a); |
| 88 | a++; |
| 89 | b++; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | static void echainiv_encrypt_compat_complete2(struct aead_request *req, |
| 94 | int err) |
| 95 | { |
| 96 | struct echainiv_request_ctx *rctx = aead_request_ctx(req); |
| 97 | struct aead_givcrypt_request *subreq = &rctx->subreq; |
| 98 | struct crypto_aead *geniv; |
| 99 | |
| 100 | if (err == -EINPROGRESS) |
| 101 | return; |
| 102 | |
| 103 | if (err) |
| 104 | goto out; |
| 105 | |
| 106 | geniv = crypto_aead_reqtfm(req); |
| 107 | scatterwalk_map_and_copy(subreq->giv, rctx->ivsg, 0, |
| 108 | crypto_aead_ivsize(geniv), 1); |
| 109 | |
| 110 | out: |
| 111 | kzfree(subreq->giv); |
| 112 | } |
| 113 | |
| 114 | static void echainiv_encrypt_compat_complete( |
| 115 | struct crypto_async_request *base, int err) |
| 116 | { |
| 117 | struct aead_request *req = base->data; |
| 118 | |
| 119 | echainiv_encrypt_compat_complete2(req, err); |
| 120 | aead_request_complete(req, err); |
| 121 | } |
| 122 | |
| 123 | static void echainiv_encrypt_complete2(struct aead_request *req, int err) |
| 124 | { |
| 125 | struct aead_request *subreq = aead_request_ctx(req); |
| 126 | struct crypto_aead *geniv; |
| 127 | unsigned int ivsize; |
| 128 | |
| 129 | if (err == -EINPROGRESS) |
| 130 | return; |
| 131 | |
| 132 | if (err) |
| 133 | goto out; |
| 134 | |
| 135 | geniv = crypto_aead_reqtfm(req); |
| 136 | ivsize = crypto_aead_ivsize(geniv); |
| 137 | |
| 138 | echainiv_write_iv(subreq->iv, ivsize); |
| 139 | |
| 140 | if (req->iv != subreq->iv) |
| 141 | memcpy(req->iv, subreq->iv, ivsize); |
| 142 | |
| 143 | out: |
| 144 | if (req->iv != subreq->iv) |
| 145 | kzfree(subreq->iv); |
| 146 | } |
| 147 | |
| 148 | static void echainiv_encrypt_complete(struct crypto_async_request *base, |
| 149 | int err) |
| 150 | { |
| 151 | struct aead_request *req = base->data; |
| 152 | |
| 153 | echainiv_encrypt_complete2(req, err); |
| 154 | aead_request_complete(req, err); |
| 155 | } |
| 156 | |
| 157 | static int echainiv_encrypt_compat(struct aead_request *req) |
| 158 | { |
| 159 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 160 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 161 | struct echainiv_request_ctx *rctx = aead_request_ctx(req); |
| 162 | struct aead_givcrypt_request *subreq = &rctx->subreq; |
| 163 | unsigned int ivsize = crypto_aead_ivsize(geniv); |
| 164 | crypto_completion_t compl; |
| 165 | void *data; |
| 166 | u8 *info; |
| 167 | __be64 seq; |
| 168 | int err; |
| 169 | |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 170 | if (req->cryptlen < ivsize) |
| 171 | return -EINVAL; |
| 172 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 173 | compl = req->base.complete; |
| 174 | data = req->base.data; |
| 175 | |
| 176 | rctx->ivsg = scatterwalk_ffwd(rctx->ivbuf, req->dst, req->assoclen); |
| 177 | info = PageHighMem(sg_page(rctx->ivsg)) ? NULL : sg_virt(rctx->ivsg); |
| 178 | |
| 179 | if (!info) { |
| 180 | info = kmalloc(ivsize, req->base.flags & |
| 181 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: |
| 182 | GFP_ATOMIC); |
| 183 | if (!info) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | compl = echainiv_encrypt_compat_complete; |
| 187 | data = req; |
| 188 | } |
| 189 | |
| 190 | memcpy(&seq, req->iv + ivsize - sizeof(seq), sizeof(seq)); |
| 191 | |
| 192 | aead_givcrypt_set_tfm(subreq, ctx->child); |
| 193 | aead_givcrypt_set_callback(subreq, req->base.flags, |
| 194 | req->base.complete, req->base.data); |
| 195 | aead_givcrypt_set_crypt(subreq, |
| 196 | scatterwalk_ffwd(rctx->src, req->src, |
| 197 | req->assoclen + ivsize), |
| 198 | scatterwalk_ffwd(rctx->dst, rctx->ivsg, |
| 199 | ivsize), |
| 200 | req->cryptlen - ivsize, req->iv); |
| 201 | aead_givcrypt_set_assoc(subreq, req->src, req->assoclen); |
| 202 | aead_givcrypt_set_giv(subreq, info, be64_to_cpu(seq)); |
| 203 | |
| 204 | err = crypto_aead_givencrypt(subreq); |
| 205 | if (unlikely(PageHighMem(sg_page(rctx->ivsg)))) |
| 206 | echainiv_encrypt_compat_complete2(req, err); |
| 207 | return err; |
| 208 | } |
| 209 | |
| 210 | static int echainiv_encrypt(struct aead_request *req) |
| 211 | { |
| 212 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 213 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 214 | struct aead_request *subreq = aead_request_ctx(req); |
| 215 | crypto_completion_t compl; |
| 216 | void *data; |
| 217 | u8 *info; |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 218 | unsigned int ivsize = crypto_aead_ivsize(geniv); |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 219 | int err; |
| 220 | |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 221 | if (req->cryptlen < ivsize) |
| 222 | return -EINVAL; |
| 223 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 224 | aead_request_set_tfm(subreq, ctx->child); |
| 225 | |
| 226 | compl = echainiv_encrypt_complete; |
| 227 | data = req; |
| 228 | info = req->iv; |
| 229 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 230 | if (req->src != req->dst) { |
| 231 | struct scatterlist src[2]; |
| 232 | struct scatterlist dst[2]; |
| 233 | struct blkcipher_desc desc = { |
| 234 | .tfm = ctx->null, |
| 235 | }; |
| 236 | |
| 237 | err = crypto_blkcipher_encrypt( |
| 238 | &desc, |
| 239 | scatterwalk_ffwd(dst, req->dst, |
| 240 | req->assoclen + ivsize), |
| 241 | scatterwalk_ffwd(src, req->src, |
| 242 | req->assoclen + ivsize), |
| 243 | req->cryptlen - ivsize); |
| 244 | if (err) |
| 245 | return err; |
| 246 | } |
| 247 | |
| 248 | if (unlikely(!IS_ALIGNED((unsigned long)info, |
| 249 | crypto_aead_alignmask(geniv) + 1))) { |
| 250 | info = kmalloc(ivsize, req->base.flags & |
| 251 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: |
| 252 | GFP_ATOMIC); |
| 253 | if (!info) |
| 254 | return -ENOMEM; |
| 255 | |
| 256 | memcpy(info, req->iv, ivsize); |
| 257 | } |
| 258 | |
| 259 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
| 260 | aead_request_set_crypt(subreq, req->dst, req->dst, |
| 261 | req->cryptlen - ivsize, info); |
| 262 | aead_request_set_ad(subreq, req->assoclen + ivsize, 0); |
| 263 | |
| 264 | crypto_xor(info, ctx->salt, ivsize); |
| 265 | scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1); |
| 266 | echainiv_read_iv(info, ivsize); |
| 267 | |
| 268 | err = crypto_aead_encrypt(subreq); |
| 269 | echainiv_encrypt_complete2(req, err); |
| 270 | return err; |
| 271 | } |
| 272 | |
| 273 | static int echainiv_decrypt_compat(struct aead_request *req) |
| 274 | { |
| 275 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 276 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 277 | struct echainiv_request_ctx *rctx = aead_request_ctx(req); |
| 278 | struct aead_request *subreq = &rctx->subreq.areq; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 279 | crypto_completion_t compl; |
| 280 | void *data; |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 281 | unsigned int ivsize = crypto_aead_ivsize(geniv); |
| 282 | |
| 283 | if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) |
| 284 | return -EINVAL; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 285 | |
| 286 | aead_request_set_tfm(subreq, ctx->child); |
| 287 | |
| 288 | compl = req->base.complete; |
| 289 | data = req->base.data; |
| 290 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 291 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 292 | aead_request_set_crypt(subreq, |
| 293 | scatterwalk_ffwd(rctx->src, req->src, |
| 294 | req->assoclen + ivsize), |
| 295 | scatterwalk_ffwd(rctx->dst, req->dst, |
| 296 | req->assoclen + ivsize), |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 297 | req->cryptlen - ivsize, req->iv); |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 298 | aead_request_set_assoc(subreq, req->src, req->assoclen); |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 299 | |
| 300 | scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); |
| 301 | |
| 302 | return crypto_aead_decrypt(subreq); |
| 303 | } |
| 304 | |
| 305 | static int echainiv_decrypt(struct aead_request *req) |
| 306 | { |
| 307 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 308 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 309 | struct aead_request *subreq = aead_request_ctx(req); |
| 310 | crypto_completion_t compl; |
| 311 | void *data; |
Herbert Xu | 823655c | 2015-05-23 15:41:54 +0800 | [diff] [blame^] | 312 | unsigned int ivsize = crypto_aead_ivsize(geniv); |
| 313 | |
| 314 | if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) |
| 315 | return -EINVAL; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 316 | |
| 317 | aead_request_set_tfm(subreq, ctx->child); |
| 318 | |
| 319 | compl = req->base.complete; |
| 320 | data = req->base.data; |
| 321 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 322 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
| 323 | aead_request_set_crypt(subreq, req->src, req->dst, |
| 324 | req->cryptlen - ivsize, req->iv); |
| 325 | aead_request_set_ad(subreq, req->assoclen + ivsize, 0); |
| 326 | |
| 327 | scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); |
| 328 | if (req->src != req->dst) |
| 329 | scatterwalk_map_and_copy(req->iv, req->dst, |
| 330 | req->assoclen, ivsize, 1); |
| 331 | |
| 332 | return crypto_aead_decrypt(subreq); |
| 333 | } |
| 334 | |
| 335 | static int echainiv_encrypt_compat_first(struct aead_request *req) |
| 336 | { |
| 337 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 338 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 339 | int err = 0; |
| 340 | |
| 341 | spin_lock_bh(&ctx->lock); |
| 342 | if (geniv->encrypt != echainiv_encrypt_compat_first) |
| 343 | goto unlock; |
| 344 | |
| 345 | geniv->encrypt = echainiv_encrypt_compat; |
| 346 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
| 347 | crypto_aead_ivsize(geniv)); |
| 348 | |
| 349 | unlock: |
| 350 | spin_unlock_bh(&ctx->lock); |
| 351 | |
| 352 | if (err) |
| 353 | return err; |
| 354 | |
| 355 | return echainiv_encrypt_compat(req); |
| 356 | } |
| 357 | |
| 358 | static int echainiv_encrypt_first(struct aead_request *req) |
| 359 | { |
| 360 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); |
| 361 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 362 | int err = 0; |
| 363 | |
| 364 | spin_lock_bh(&ctx->lock); |
| 365 | if (geniv->encrypt != echainiv_encrypt_first) |
| 366 | goto unlock; |
| 367 | |
| 368 | geniv->encrypt = echainiv_encrypt; |
| 369 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
| 370 | crypto_aead_ivsize(geniv)); |
| 371 | |
| 372 | unlock: |
| 373 | spin_unlock_bh(&ctx->lock); |
| 374 | |
| 375 | if (err) |
| 376 | return err; |
| 377 | |
| 378 | return echainiv_encrypt(req); |
| 379 | } |
| 380 | |
| 381 | static int echainiv_compat_init(struct crypto_tfm *tfm) |
| 382 | { |
| 383 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); |
| 384 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 385 | int err; |
| 386 | |
| 387 | spin_lock_init(&ctx->lock); |
| 388 | |
| 389 | crypto_aead_set_reqsize(geniv, sizeof(struct echainiv_request_ctx)); |
| 390 | |
| 391 | err = aead_geniv_init(tfm); |
| 392 | |
| 393 | ctx->child = geniv->child; |
| 394 | geniv->child = geniv; |
| 395 | |
| 396 | return err; |
| 397 | } |
| 398 | |
| 399 | static int echainiv_init(struct crypto_tfm *tfm) |
| 400 | { |
| 401 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); |
| 402 | struct echainiv_ctx *ctx = crypto_aead_ctx(geniv); |
| 403 | int err; |
| 404 | |
| 405 | spin_lock_init(&ctx->lock); |
| 406 | |
| 407 | crypto_aead_set_reqsize(geniv, sizeof(struct aead_request)); |
| 408 | |
| 409 | ctx->null = crypto_get_default_null_skcipher(); |
| 410 | err = PTR_ERR(ctx->null); |
| 411 | if (IS_ERR(ctx->null)) |
| 412 | goto out; |
| 413 | |
| 414 | err = aead_geniv_init(tfm); |
| 415 | if (err) |
| 416 | goto drop_null; |
| 417 | |
| 418 | ctx->child = geniv->child; |
| 419 | geniv->child = geniv; |
| 420 | |
| 421 | out: |
| 422 | return err; |
| 423 | |
| 424 | drop_null: |
| 425 | crypto_put_default_null_skcipher(); |
| 426 | goto out; |
| 427 | } |
| 428 | |
| 429 | static void echainiv_compat_exit(struct crypto_tfm *tfm) |
| 430 | { |
| 431 | struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm); |
| 432 | |
| 433 | crypto_free_aead(ctx->child); |
| 434 | } |
| 435 | |
| 436 | static void echainiv_exit(struct crypto_tfm *tfm) |
| 437 | { |
| 438 | struct echainiv_ctx *ctx = crypto_tfm_ctx(tfm); |
| 439 | |
| 440 | crypto_free_aead(ctx->child); |
| 441 | crypto_put_default_null_skcipher(); |
| 442 | } |
| 443 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 444 | static int echainiv_aead_create(struct crypto_template *tmpl, |
| 445 | struct rtattr **tb) |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 446 | { |
| 447 | struct aead_instance *inst; |
| 448 | struct crypto_aead_spawn *spawn; |
| 449 | struct aead_alg *alg; |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 450 | int err; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 451 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 452 | inst = aead_geniv_alloc(tmpl, tb, 0, 0); |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 453 | |
| 454 | if (IS_ERR(inst)) |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 455 | return PTR_ERR(inst); |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 456 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 457 | err = -EINVAL; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 458 | if (inst->alg.ivsize < sizeof(u64) || |
| 459 | inst->alg.ivsize & (sizeof(u32) - 1) || |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 460 | inst->alg.ivsize > MAX_IV_SIZE) |
| 461 | goto free_inst; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 462 | |
| 463 | spawn = aead_instance_ctx(inst); |
| 464 | alg = crypto_spawn_aead_alg(spawn); |
| 465 | |
| 466 | inst->alg.setkey = echainiv_setkey; |
| 467 | inst->alg.setauthsize = echainiv_setauthsize; |
| 468 | inst->alg.encrypt = echainiv_encrypt_first; |
| 469 | inst->alg.decrypt = echainiv_decrypt; |
| 470 | |
| 471 | inst->alg.base.cra_init = echainiv_init; |
| 472 | inst->alg.base.cra_exit = echainiv_exit; |
| 473 | |
| 474 | inst->alg.base.cra_alignmask |= __alignof__(u32) - 1; |
| 475 | inst->alg.base.cra_ctxsize = sizeof(struct echainiv_ctx); |
| 476 | inst->alg.base.cra_ctxsize += inst->alg.base.cra_aead.ivsize; |
| 477 | |
| 478 | if (alg->base.cra_aead.encrypt) { |
| 479 | inst->alg.encrypt = echainiv_encrypt_compat_first; |
| 480 | inst->alg.decrypt = echainiv_decrypt_compat; |
| 481 | |
| 482 | inst->alg.base.cra_init = echainiv_compat_init; |
| 483 | inst->alg.base.cra_exit = echainiv_compat_exit; |
| 484 | } |
| 485 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 486 | err = aead_register_instance(tmpl, inst); |
| 487 | if (err) |
| 488 | goto free_inst; |
| 489 | |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 490 | out: |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 491 | return err; |
| 492 | |
| 493 | free_inst: |
| 494 | aead_geniv_free(inst); |
| 495 | goto out; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 496 | } |
| 497 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 498 | static int echainiv_create(struct crypto_template *tmpl, struct rtattr **tb) |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 499 | { |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 500 | int err; |
| 501 | |
| 502 | err = crypto_get_default_rng(); |
| 503 | if (err) |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 504 | goto out; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 505 | |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 506 | err = echainiv_aead_create(tmpl, tb); |
| 507 | if (err) |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 508 | goto put_rng; |
| 509 | |
| 510 | out: |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 511 | return err; |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 512 | |
| 513 | put_rng: |
| 514 | crypto_put_default_rng(); |
| 515 | goto out; |
| 516 | } |
| 517 | |
| 518 | static void echainiv_free(struct crypto_instance *inst) |
| 519 | { |
| 520 | aead_geniv_free(aead_instance(inst)); |
| 521 | crypto_put_default_rng(); |
| 522 | } |
| 523 | |
| 524 | static struct crypto_template echainiv_tmpl = { |
| 525 | .name = "echainiv", |
Herbert Xu | 1e419c7 | 2015-05-23 15:41:52 +0800 | [diff] [blame] | 526 | .create = echainiv_create, |
Herbert Xu | a10f554 | 2015-05-21 15:11:15 +0800 | [diff] [blame] | 527 | .free = echainiv_free, |
| 528 | .module = THIS_MODULE, |
| 529 | }; |
| 530 | |
| 531 | static int __init echainiv_module_init(void) |
| 532 | { |
| 533 | return crypto_register_template(&echainiv_tmpl); |
| 534 | } |
| 535 | |
| 536 | static void __exit echainiv_module_exit(void) |
| 537 | { |
| 538 | crypto_unregister_template(&echainiv_tmpl); |
| 539 | } |
| 540 | |
| 541 | module_init(echainiv_module_init); |
| 542 | module_exit(echainiv_module_exit); |
| 543 | |
| 544 | MODULE_LICENSE("GPL"); |
| 545 | MODULE_DESCRIPTION("Encrypted Chain IV Generator"); |
| 546 | MODULE_ALIAS_CRYPTO("echainiv"); |