| 1 | /* |
| 2 | * GCM: Galois/Counter Mode. |
| 3 | * |
| 4 | * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi> |
| 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 version 2 as published |
| 8 | * by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <crypto/gf128mul.h> |
| 12 | #include <crypto/internal/aead.h> |
| 13 | #include <crypto/internal/skcipher.h> |
| 14 | #include <crypto/internal/hash.h> |
| 15 | #include <crypto/scatterwalk.h> |
| 16 | #include <crypto/hash.h> |
| 17 | #include "internal.h" |
| 18 | #include <linux/completion.h> |
| 19 | #include <linux/err.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/module.h> |
| 23 | #include <linux/slab.h> |
| 24 | |
| 25 | struct gcm_instance_ctx { |
| 26 | struct crypto_skcipher_spawn ctr; |
| 27 | struct crypto_ahash_spawn ghash; |
| 28 | }; |
| 29 | |
| 30 | struct crypto_gcm_ctx { |
| 31 | struct crypto_ablkcipher *ctr; |
| 32 | struct crypto_ahash *ghash; |
| 33 | }; |
| 34 | |
| 35 | struct crypto_rfc4106_ctx { |
| 36 | struct crypto_aead *child; |
| 37 | u8 nonce[4]; |
| 38 | }; |
| 39 | |
| 40 | struct crypto_gcm_ghash_ctx { |
| 41 | unsigned int cryptlen; |
| 42 | struct scatterlist *src; |
| 43 | crypto_completion_t complete; |
| 44 | }; |
| 45 | |
| 46 | struct crypto_gcm_req_priv_ctx { |
| 47 | u8 auth_tag[16]; |
| 48 | u8 iauth_tag[16]; |
| 49 | struct scatterlist src[2]; |
| 50 | struct scatterlist dst[2]; |
| 51 | struct crypto_gcm_ghash_ctx ghash_ctx; |
| 52 | union { |
| 53 | struct ahash_request ahreq; |
| 54 | struct ablkcipher_request abreq; |
| 55 | } u; |
| 56 | }; |
| 57 | |
| 58 | struct crypto_gcm_setkey_result { |
| 59 | int err; |
| 60 | struct completion completion; |
| 61 | }; |
| 62 | |
| 63 | static void *gcm_zeroes; |
| 64 | |
| 65 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
| 66 | struct aead_request *req) |
| 67 | { |
| 68 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); |
| 69 | |
| 70 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); |
| 71 | } |
| 72 | |
| 73 | static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err) |
| 74 | { |
| 75 | struct crypto_gcm_setkey_result *result = req->data; |
| 76 | |
| 77 | if (err == -EINPROGRESS) |
| 78 | return; |
| 79 | |
| 80 | result->err = err; |
| 81 | complete(&result->completion); |
| 82 | } |
| 83 | |
| 84 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, |
| 85 | unsigned int keylen) |
| 86 | { |
| 87 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
| 88 | struct crypto_ahash *ghash = ctx->ghash; |
| 89 | struct crypto_ablkcipher *ctr = ctx->ctr; |
| 90 | struct { |
| 91 | be128 hash; |
| 92 | u8 iv[8]; |
| 93 | |
| 94 | struct crypto_gcm_setkey_result result; |
| 95 | |
| 96 | struct scatterlist sg[1]; |
| 97 | struct ablkcipher_request req; |
| 98 | } *data; |
| 99 | int err; |
| 100 | |
| 101 | crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
| 102 | crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) & |
| 103 | CRYPTO_TFM_REQ_MASK); |
| 104 | |
| 105 | err = crypto_ablkcipher_setkey(ctr, key, keylen); |
| 106 | if (err) |
| 107 | return err; |
| 108 | |
| 109 | crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) & |
| 110 | CRYPTO_TFM_RES_MASK); |
| 111 | |
| 112 | data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr), |
| 113 | GFP_KERNEL); |
| 114 | if (!data) |
| 115 | return -ENOMEM; |
| 116 | |
| 117 | init_completion(&data->result.completion); |
| 118 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); |
| 119 | ablkcipher_request_set_tfm(&data->req, ctr); |
| 120 | ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | |
| 121 | CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 122 | crypto_gcm_setkey_done, |
| 123 | &data->result); |
| 124 | ablkcipher_request_set_crypt(&data->req, data->sg, data->sg, |
| 125 | sizeof(data->hash), data->iv); |
| 126 | |
| 127 | err = crypto_ablkcipher_encrypt(&data->req); |
| 128 | if (err == -EINPROGRESS || err == -EBUSY) { |
| 129 | err = wait_for_completion_interruptible( |
| 130 | &data->result.completion); |
| 131 | if (!err) |
| 132 | err = data->result.err; |
| 133 | } |
| 134 | |
| 135 | if (err) |
| 136 | goto out; |
| 137 | |
| 138 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
| 139 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & |
| 140 | CRYPTO_TFM_REQ_MASK); |
| 141 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); |
| 142 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & |
| 143 | CRYPTO_TFM_RES_MASK); |
| 144 | |
| 145 | out: |
| 146 | kfree(data); |
| 147 | return err; |
| 148 | } |
| 149 | |
| 150 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
| 151 | unsigned int authsize) |
| 152 | { |
| 153 | switch (authsize) { |
| 154 | case 4: |
| 155 | case 8: |
| 156 | case 12: |
| 157 | case 13: |
| 158 | case 14: |
| 159 | case 15: |
| 160 | case 16: |
| 161 | break; |
| 162 | default: |
| 163 | return -EINVAL; |
| 164 | } |
| 165 | |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req, |
| 170 | struct aead_request *req, |
| 171 | unsigned int cryptlen) |
| 172 | { |
| 173 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 174 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
| 175 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 176 | struct scatterlist *dst; |
| 177 | __be32 counter = cpu_to_be32(1); |
| 178 | |
| 179 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); |
| 180 | memcpy(req->iv + 12, &counter, 4); |
| 181 | |
| 182 | sg_init_table(pctx->src, 2); |
| 183 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| 184 | scatterwalk_sg_chain(pctx->src, 2, req->src); |
| 185 | |
| 186 | dst = pctx->src; |
| 187 | if (req->src != req->dst) { |
| 188 | sg_init_table(pctx->dst, 2); |
| 189 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| 190 | scatterwalk_sg_chain(pctx->dst, 2, req->dst); |
| 191 | dst = pctx->dst; |
| 192 | } |
| 193 | |
| 194 | ablkcipher_request_set_tfm(ablk_req, ctx->ctr); |
| 195 | ablkcipher_request_set_crypt(ablk_req, pctx->src, dst, |
| 196 | cryptlen + sizeof(pctx->auth_tag), |
| 197 | req->iv); |
| 198 | } |
| 199 | |
| 200 | static inline unsigned int gcm_remain(unsigned int len) |
| 201 | { |
| 202 | len &= 0xfU; |
| 203 | return len ? 16 - len : 0; |
| 204 | } |
| 205 | |
| 206 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); |
| 207 | static void gcm_hash_final_done(struct crypto_async_request *areq, int err); |
| 208 | |
| 209 | static int gcm_hash_update(struct aead_request *req, |
| 210 | struct crypto_gcm_req_priv_ctx *pctx, |
| 211 | crypto_completion_t complete, |
| 212 | struct scatterlist *src, |
| 213 | unsigned int len) |
| 214 | { |
| 215 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 216 | |
| 217 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 218 | complete, req); |
| 219 | ahash_request_set_crypt(ahreq, src, NULL, len); |
| 220 | |
| 221 | return crypto_ahash_update(ahreq); |
| 222 | } |
| 223 | |
| 224 | static int gcm_hash_remain(struct aead_request *req, |
| 225 | struct crypto_gcm_req_priv_ctx *pctx, |
| 226 | unsigned int remain, |
| 227 | crypto_completion_t complete) |
| 228 | { |
| 229 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 230 | |
| 231 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 232 | complete, req); |
| 233 | sg_init_one(pctx->src, gcm_zeroes, remain); |
| 234 | ahash_request_set_crypt(ahreq, pctx->src, NULL, remain); |
| 235 | |
| 236 | return crypto_ahash_update(ahreq); |
| 237 | } |
| 238 | |
| 239 | static int gcm_hash_len(struct aead_request *req, |
| 240 | struct crypto_gcm_req_priv_ctx *pctx) |
| 241 | { |
| 242 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 243 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 244 | u128 lengths; |
| 245 | |
| 246 | lengths.a = cpu_to_be64(req->assoclen * 8); |
| 247 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); |
| 248 | memcpy(pctx->iauth_tag, &lengths, 16); |
| 249 | sg_init_one(pctx->src, pctx->iauth_tag, 16); |
| 250 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 251 | gcm_hash_len_done, req); |
| 252 | ahash_request_set_crypt(ahreq, pctx->src, |
| 253 | NULL, sizeof(lengths)); |
| 254 | |
| 255 | return crypto_ahash_update(ahreq); |
| 256 | } |
| 257 | |
| 258 | static int gcm_hash_final(struct aead_request *req, |
| 259 | struct crypto_gcm_req_priv_ctx *pctx) |
| 260 | { |
| 261 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 262 | |
| 263 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 264 | gcm_hash_final_done, req); |
| 265 | ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0); |
| 266 | |
| 267 | return crypto_ahash_final(ahreq); |
| 268 | } |
| 269 | |
| 270 | static void gcm_hash_final_done(struct crypto_async_request *areq, |
| 271 | int err) |
| 272 | { |
| 273 | struct aead_request *req = areq->data; |
| 274 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 275 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 276 | |
| 277 | if (!err) |
| 278 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); |
| 279 | |
| 280 | gctx->complete(areq, err); |
| 281 | } |
| 282 | |
| 283 | static void gcm_hash_len_done(struct crypto_async_request *areq, |
| 284 | int err) |
| 285 | { |
| 286 | struct aead_request *req = areq->data; |
| 287 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 288 | |
| 289 | if (!err) { |
| 290 | err = gcm_hash_final(req, pctx); |
| 291 | if (err == -EINPROGRESS || err == -EBUSY) |
| 292 | return; |
| 293 | } |
| 294 | |
| 295 | gcm_hash_final_done(areq, err); |
| 296 | } |
| 297 | |
| 298 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
| 299 | int err) |
| 300 | { |
| 301 | struct aead_request *req = areq->data; |
| 302 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 303 | |
| 304 | if (!err) { |
| 305 | err = gcm_hash_len(req, pctx); |
| 306 | if (err == -EINPROGRESS || err == -EBUSY) |
| 307 | return; |
| 308 | } |
| 309 | |
| 310 | gcm_hash_len_done(areq, err); |
| 311 | } |
| 312 | |
| 313 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, |
| 314 | int err) |
| 315 | { |
| 316 | struct aead_request *req = areq->data; |
| 317 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 318 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 319 | unsigned int remain; |
| 320 | |
| 321 | if (!err) { |
| 322 | remain = gcm_remain(gctx->cryptlen); |
| 323 | BUG_ON(!remain); |
| 324 | err = gcm_hash_remain(req, pctx, remain, |
| 325 | gcm_hash_crypt_remain_done); |
| 326 | if (err == -EINPROGRESS || err == -EBUSY) |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | gcm_hash_crypt_remain_done(areq, err); |
| 331 | } |
| 332 | |
| 333 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
| 334 | int err) |
| 335 | { |
| 336 | struct aead_request *req = areq->data; |
| 337 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 338 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 339 | crypto_completion_t complete; |
| 340 | unsigned int remain = 0; |
| 341 | |
| 342 | if (!err && gctx->cryptlen) { |
| 343 | remain = gcm_remain(gctx->cryptlen); |
| 344 | complete = remain ? gcm_hash_crypt_done : |
| 345 | gcm_hash_crypt_remain_done; |
| 346 | err = gcm_hash_update(req, pctx, complete, |
| 347 | gctx->src, gctx->cryptlen); |
| 348 | if (err == -EINPROGRESS || err == -EBUSY) |
| 349 | return; |
| 350 | } |
| 351 | |
| 352 | if (remain) |
| 353 | gcm_hash_crypt_done(areq, err); |
| 354 | else |
| 355 | gcm_hash_crypt_remain_done(areq, err); |
| 356 | } |
| 357 | |
| 358 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, |
| 359 | int err) |
| 360 | { |
| 361 | struct aead_request *req = areq->data; |
| 362 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 363 | unsigned int remain; |
| 364 | |
| 365 | if (!err) { |
| 366 | remain = gcm_remain(req->assoclen); |
| 367 | BUG_ON(!remain); |
| 368 | err = gcm_hash_remain(req, pctx, remain, |
| 369 | gcm_hash_assoc_remain_done); |
| 370 | if (err == -EINPROGRESS || err == -EBUSY) |
| 371 | return; |
| 372 | } |
| 373 | |
| 374 | gcm_hash_assoc_remain_done(areq, err); |
| 375 | } |
| 376 | |
| 377 | static void gcm_hash_init_done(struct crypto_async_request *areq, |
| 378 | int err) |
| 379 | { |
| 380 | struct aead_request *req = areq->data; |
| 381 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 382 | crypto_completion_t complete; |
| 383 | unsigned int remain = 0; |
| 384 | |
| 385 | if (!err && req->assoclen) { |
| 386 | remain = gcm_remain(req->assoclen); |
| 387 | complete = remain ? gcm_hash_assoc_done : |
| 388 | gcm_hash_assoc_remain_done; |
| 389 | err = gcm_hash_update(req, pctx, complete, |
| 390 | req->assoc, req->assoclen); |
| 391 | if (err == -EINPROGRESS || err == -EBUSY) |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | if (remain) |
| 396 | gcm_hash_assoc_done(areq, err); |
| 397 | else |
| 398 | gcm_hash_assoc_remain_done(areq, err); |
| 399 | } |
| 400 | |
| 401 | static int gcm_hash(struct aead_request *req, |
| 402 | struct crypto_gcm_req_priv_ctx *pctx) |
| 403 | { |
| 404 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 405 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 406 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm); |
| 407 | unsigned int remain; |
| 408 | crypto_completion_t complete; |
| 409 | int err; |
| 410 | |
| 411 | ahash_request_set_tfm(ahreq, ctx->ghash); |
| 412 | |
| 413 | ahash_request_set_callback(ahreq, aead_request_flags(req), |
| 414 | gcm_hash_init_done, req); |
| 415 | err = crypto_ahash_init(ahreq); |
| 416 | if (err) |
| 417 | return err; |
| 418 | remain = gcm_remain(req->assoclen); |
| 419 | complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done; |
| 420 | err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen); |
| 421 | if (err) |
| 422 | return err; |
| 423 | if (remain) { |
| 424 | err = gcm_hash_remain(req, pctx, remain, |
| 425 | gcm_hash_assoc_remain_done); |
| 426 | if (err) |
| 427 | return err; |
| 428 | } |
| 429 | remain = gcm_remain(gctx->cryptlen); |
| 430 | complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done; |
| 431 | err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen); |
| 432 | if (err) |
| 433 | return err; |
| 434 | if (remain) { |
| 435 | err = gcm_hash_remain(req, pctx, remain, |
| 436 | gcm_hash_crypt_remain_done); |
| 437 | if (err) |
| 438 | return err; |
| 439 | } |
| 440 | err = gcm_hash_len(req, pctx); |
| 441 | if (err) |
| 442 | return err; |
| 443 | err = gcm_hash_final(req, pctx); |
| 444 | if (err) |
| 445 | return err; |
| 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | static void gcm_enc_copy_hash(struct aead_request *req, |
| 451 | struct crypto_gcm_req_priv_ctx *pctx) |
| 452 | { |
| 453 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 454 | u8 *auth_tag = pctx->auth_tag; |
| 455 | |
| 456 | scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen, |
| 457 | crypto_aead_authsize(aead), 1); |
| 458 | } |
| 459 | |
| 460 | static void gcm_enc_hash_done(struct crypto_async_request *areq, |
| 461 | int err) |
| 462 | { |
| 463 | struct aead_request *req = areq->data; |
| 464 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 465 | |
| 466 | if (!err) |
| 467 | gcm_enc_copy_hash(req, pctx); |
| 468 | |
| 469 | aead_request_complete(req, err); |
| 470 | } |
| 471 | |
| 472 | static void gcm_encrypt_done(struct crypto_async_request *areq, |
| 473 | int err) |
| 474 | { |
| 475 | struct aead_request *req = areq->data; |
| 476 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 477 | |
| 478 | if (!err) { |
| 479 | err = gcm_hash(req, pctx); |
| 480 | if (err == -EINPROGRESS || err == -EBUSY) |
| 481 | return; |
| 482 | } |
| 483 | |
| 484 | gcm_enc_hash_done(areq, err); |
| 485 | } |
| 486 | |
| 487 | static int crypto_gcm_encrypt(struct aead_request *req) |
| 488 | { |
| 489 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 490 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
| 491 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 492 | int err; |
| 493 | |
| 494 | crypto_gcm_init_crypt(abreq, req, req->cryptlen); |
| 495 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 496 | gcm_encrypt_done, req); |
| 497 | |
| 498 | gctx->src = req->dst; |
| 499 | gctx->cryptlen = req->cryptlen; |
| 500 | gctx->complete = gcm_enc_hash_done; |
| 501 | |
| 502 | err = crypto_ablkcipher_encrypt(abreq); |
| 503 | if (err) |
| 504 | return err; |
| 505 | |
| 506 | err = gcm_hash(req, pctx); |
| 507 | if (err) |
| 508 | return err; |
| 509 | |
| 510 | crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16); |
| 511 | gcm_enc_copy_hash(req, pctx); |
| 512 | |
| 513 | return 0; |
| 514 | } |
| 515 | |
| 516 | static int crypto_gcm_verify(struct aead_request *req, |
| 517 | struct crypto_gcm_req_priv_ctx *pctx) |
| 518 | { |
| 519 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 520 | u8 *auth_tag = pctx->auth_tag; |
| 521 | u8 *iauth_tag = pctx->iauth_tag; |
| 522 | unsigned int authsize = crypto_aead_authsize(aead); |
| 523 | unsigned int cryptlen = req->cryptlen - authsize; |
| 524 | |
| 525 | crypto_xor(auth_tag, iauth_tag, 16); |
| 526 | scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0); |
| 527 | return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
| 528 | } |
| 529 | |
| 530 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
| 531 | { |
| 532 | struct aead_request *req = areq->data; |
| 533 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 534 | |
| 535 | if (!err) |
| 536 | err = crypto_gcm_verify(req, pctx); |
| 537 | |
| 538 | aead_request_complete(req, err); |
| 539 | } |
| 540 | |
| 541 | static void gcm_dec_hash_done(struct crypto_async_request *areq, int err) |
| 542 | { |
| 543 | struct aead_request *req = areq->data; |
| 544 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 545 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
| 546 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 547 | |
| 548 | if (!err) { |
| 549 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 550 | gcm_decrypt_done, req); |
| 551 | crypto_gcm_init_crypt(abreq, req, gctx->cryptlen); |
| 552 | err = crypto_ablkcipher_decrypt(abreq); |
| 553 | if (err == -EINPROGRESS || err == -EBUSY) |
| 554 | return; |
| 555 | } |
| 556 | |
| 557 | gcm_decrypt_done(areq, err); |
| 558 | } |
| 559 | |
| 560 | static int crypto_gcm_decrypt(struct aead_request *req) |
| 561 | { |
| 562 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 563 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 564 | struct ablkcipher_request *abreq = &pctx->u.abreq; |
| 565 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 566 | unsigned int authsize = crypto_aead_authsize(aead); |
| 567 | unsigned int cryptlen = req->cryptlen; |
| 568 | int err; |
| 569 | |
| 570 | if (cryptlen < authsize) |
| 571 | return -EINVAL; |
| 572 | cryptlen -= authsize; |
| 573 | |
| 574 | gctx->src = req->src; |
| 575 | gctx->cryptlen = cryptlen; |
| 576 | gctx->complete = gcm_dec_hash_done; |
| 577 | |
| 578 | err = gcm_hash(req, pctx); |
| 579 | if (err) |
| 580 | return err; |
| 581 | |
| 582 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
| 583 | gcm_decrypt_done, req); |
| 584 | crypto_gcm_init_crypt(abreq, req, cryptlen); |
| 585 | err = crypto_ablkcipher_decrypt(abreq); |
| 586 | if (err) |
| 587 | return err; |
| 588 | |
| 589 | return crypto_gcm_verify(req, pctx); |
| 590 | } |
| 591 | |
| 592 | static int crypto_gcm_init_tfm(struct crypto_tfm *tfm) |
| 593 | { |
| 594 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
| 595 | struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst); |
| 596 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); |
| 597 | struct crypto_ablkcipher *ctr; |
| 598 | struct crypto_ahash *ghash; |
| 599 | unsigned long align; |
| 600 | int err; |
| 601 | |
| 602 | ghash = crypto_spawn_ahash(&ictx->ghash); |
| 603 | if (IS_ERR(ghash)) |
| 604 | return PTR_ERR(ghash); |
| 605 | |
| 606 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
| 607 | err = PTR_ERR(ctr); |
| 608 | if (IS_ERR(ctr)) |
| 609 | goto err_free_hash; |
| 610 | |
| 611 | ctx->ctr = ctr; |
| 612 | ctx->ghash = ghash; |
| 613 | |
| 614 | align = crypto_tfm_alg_alignmask(tfm); |
| 615 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 616 | tfm->crt_aead.reqsize = align + |
| 617 | offsetof(struct crypto_gcm_req_priv_ctx, u) + |
| 618 | max(sizeof(struct ablkcipher_request) + |
| 619 | crypto_ablkcipher_reqsize(ctr), |
| 620 | sizeof(struct ahash_request) + |
| 621 | crypto_ahash_reqsize(ghash)); |
| 622 | |
| 623 | return 0; |
| 624 | |
| 625 | err_free_hash: |
| 626 | crypto_free_ahash(ghash); |
| 627 | return err; |
| 628 | } |
| 629 | |
| 630 | static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm) |
| 631 | { |
| 632 | struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm); |
| 633 | |
| 634 | crypto_free_ahash(ctx->ghash); |
| 635 | crypto_free_ablkcipher(ctx->ctr); |
| 636 | } |
| 637 | |
| 638 | static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb, |
| 639 | const char *full_name, |
| 640 | const char *ctr_name, |
| 641 | const char *ghash_name) |
| 642 | { |
| 643 | struct crypto_attr_type *algt; |
| 644 | struct crypto_instance *inst; |
| 645 | struct crypto_alg *ctr; |
| 646 | struct crypto_alg *ghash_alg; |
| 647 | struct ahash_alg *ghash_ahash_alg; |
| 648 | struct gcm_instance_ctx *ctx; |
| 649 | int err; |
| 650 | |
| 651 | algt = crypto_get_attr_type(tb); |
| 652 | err = PTR_ERR(algt); |
| 653 | if (IS_ERR(algt)) |
| 654 | return ERR_PTR(err); |
| 655 | |
| 656 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 657 | return ERR_PTR(-EINVAL); |
| 658 | |
| 659 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
| 660 | CRYPTO_ALG_TYPE_HASH, |
| 661 | CRYPTO_ALG_TYPE_AHASH_MASK); |
| 662 | err = PTR_ERR(ghash_alg); |
| 663 | if (IS_ERR(ghash_alg)) |
| 664 | return ERR_PTR(err); |
| 665 | |
| 666 | err = -ENOMEM; |
| 667 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 668 | if (!inst) |
| 669 | goto out_put_ghash; |
| 670 | |
| 671 | ctx = crypto_instance_ctx(inst); |
| 672 | ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base); |
| 673 | err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg, |
| 674 | inst); |
| 675 | if (err) |
| 676 | goto err_free_inst; |
| 677 | |
| 678 | crypto_set_skcipher_spawn(&ctx->ctr, inst); |
| 679 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
| 680 | crypto_requires_sync(algt->type, |
| 681 | algt->mask)); |
| 682 | if (err) |
| 683 | goto err_drop_ghash; |
| 684 | |
| 685 | ctr = crypto_skcipher_spawn_alg(&ctx->ctr); |
| 686 | |
| 687 | /* We only support 16-byte blocks. */ |
| 688 | if (ctr->cra_ablkcipher.ivsize != 16) |
| 689 | goto out_put_ctr; |
| 690 | |
| 691 | /* Not a stream cipher? */ |
| 692 | err = -EINVAL; |
| 693 | if (ctr->cra_blocksize != 1) |
| 694 | goto out_put_ctr; |
| 695 | |
| 696 | err = -ENAMETOOLONG; |
| 697 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 698 | "gcm_base(%s,%s)", ctr->cra_driver_name, |
| 699 | ghash_alg->cra_driver_name) >= |
| 700 | CRYPTO_MAX_ALG_NAME) |
| 701 | goto out_put_ctr; |
| 702 | |
| 703 | memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME); |
| 704 | |
| 705 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
| 706 | inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC; |
| 707 | inst->alg.cra_priority = ctr->cra_priority; |
| 708 | inst->alg.cra_blocksize = 1; |
| 709 | inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1); |
| 710 | inst->alg.cra_type = &crypto_aead_type; |
| 711 | inst->alg.cra_aead.ivsize = 16; |
| 712 | inst->alg.cra_aead.maxauthsize = 16; |
| 713 | inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
| 714 | inst->alg.cra_init = crypto_gcm_init_tfm; |
| 715 | inst->alg.cra_exit = crypto_gcm_exit_tfm; |
| 716 | inst->alg.cra_aead.setkey = crypto_gcm_setkey; |
| 717 | inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize; |
| 718 | inst->alg.cra_aead.encrypt = crypto_gcm_encrypt; |
| 719 | inst->alg.cra_aead.decrypt = crypto_gcm_decrypt; |
| 720 | |
| 721 | out: |
| 722 | crypto_mod_put(ghash_alg); |
| 723 | return inst; |
| 724 | |
| 725 | out_put_ctr: |
| 726 | crypto_drop_skcipher(&ctx->ctr); |
| 727 | err_drop_ghash: |
| 728 | crypto_drop_ahash(&ctx->ghash); |
| 729 | err_free_inst: |
| 730 | kfree(inst); |
| 731 | out_put_ghash: |
| 732 | inst = ERR_PTR(err); |
| 733 | goto out; |
| 734 | } |
| 735 | |
| 736 | static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb) |
| 737 | { |
| 738 | int err; |
| 739 | const char *cipher_name; |
| 740 | char ctr_name[CRYPTO_MAX_ALG_NAME]; |
| 741 | char full_name[CRYPTO_MAX_ALG_NAME]; |
| 742 | |
| 743 | cipher_name = crypto_attr_alg_name(tb[1]); |
| 744 | err = PTR_ERR(cipher_name); |
| 745 | if (IS_ERR(cipher_name)) |
| 746 | return ERR_PTR(err); |
| 747 | |
| 748 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= |
| 749 | CRYPTO_MAX_ALG_NAME) |
| 750 | return ERR_PTR(-ENAMETOOLONG); |
| 751 | |
| 752 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >= |
| 753 | CRYPTO_MAX_ALG_NAME) |
| 754 | return ERR_PTR(-ENAMETOOLONG); |
| 755 | |
| 756 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash"); |
| 757 | } |
| 758 | |
| 759 | static void crypto_gcm_free(struct crypto_instance *inst) |
| 760 | { |
| 761 | struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst); |
| 762 | |
| 763 | crypto_drop_skcipher(&ctx->ctr); |
| 764 | crypto_drop_ahash(&ctx->ghash); |
| 765 | kfree(inst); |
| 766 | } |
| 767 | |
| 768 | static struct crypto_template crypto_gcm_tmpl = { |
| 769 | .name = "gcm", |
| 770 | .alloc = crypto_gcm_alloc, |
| 771 | .free = crypto_gcm_free, |
| 772 | .module = THIS_MODULE, |
| 773 | }; |
| 774 | |
| 775 | static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb) |
| 776 | { |
| 777 | int err; |
| 778 | const char *ctr_name; |
| 779 | const char *ghash_name; |
| 780 | char full_name[CRYPTO_MAX_ALG_NAME]; |
| 781 | |
| 782 | ctr_name = crypto_attr_alg_name(tb[1]); |
| 783 | err = PTR_ERR(ctr_name); |
| 784 | if (IS_ERR(ctr_name)) |
| 785 | return ERR_PTR(err); |
| 786 | |
| 787 | ghash_name = crypto_attr_alg_name(tb[2]); |
| 788 | err = PTR_ERR(ghash_name); |
| 789 | if (IS_ERR(ghash_name)) |
| 790 | return ERR_PTR(err); |
| 791 | |
| 792 | if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)", |
| 793 | ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME) |
| 794 | return ERR_PTR(-ENAMETOOLONG); |
| 795 | |
| 796 | return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name); |
| 797 | } |
| 798 | |
| 799 | static struct crypto_template crypto_gcm_base_tmpl = { |
| 800 | .name = "gcm_base", |
| 801 | .alloc = crypto_gcm_base_alloc, |
| 802 | .free = crypto_gcm_free, |
| 803 | .module = THIS_MODULE, |
| 804 | }; |
| 805 | |
| 806 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
| 807 | unsigned int keylen) |
| 808 | { |
| 809 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); |
| 810 | struct crypto_aead *child = ctx->child; |
| 811 | int err; |
| 812 | |
| 813 | if (keylen < 4) |
| 814 | return -EINVAL; |
| 815 | |
| 816 | keylen -= 4; |
| 817 | memcpy(ctx->nonce, key + keylen, 4); |
| 818 | |
| 819 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
| 820 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & |
| 821 | CRYPTO_TFM_REQ_MASK); |
| 822 | err = crypto_aead_setkey(child, key, keylen); |
| 823 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & |
| 824 | CRYPTO_TFM_RES_MASK); |
| 825 | |
| 826 | return err; |
| 827 | } |
| 828 | |
| 829 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, |
| 830 | unsigned int authsize) |
| 831 | { |
| 832 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); |
| 833 | |
| 834 | switch (authsize) { |
| 835 | case 8: |
| 836 | case 12: |
| 837 | case 16: |
| 838 | break; |
| 839 | default: |
| 840 | return -EINVAL; |
| 841 | } |
| 842 | |
| 843 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 844 | } |
| 845 | |
| 846 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) |
| 847 | { |
| 848 | struct aead_request *subreq = aead_request_ctx(req); |
| 849 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 850 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); |
| 851 | struct crypto_aead *child = ctx->child; |
| 852 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
| 853 | crypto_aead_alignmask(child) + 1); |
| 854 | |
| 855 | memcpy(iv, ctx->nonce, 4); |
| 856 | memcpy(iv + 4, req->iv, 8); |
| 857 | |
| 858 | aead_request_set_tfm(subreq, child); |
| 859 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, |
| 860 | req->base.data); |
| 861 | aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv); |
| 862 | aead_request_set_assoc(subreq, req->assoc, req->assoclen); |
| 863 | |
| 864 | return subreq; |
| 865 | } |
| 866 | |
| 867 | static int crypto_rfc4106_encrypt(struct aead_request *req) |
| 868 | { |
| 869 | req = crypto_rfc4106_crypt(req); |
| 870 | |
| 871 | return crypto_aead_encrypt(req); |
| 872 | } |
| 873 | |
| 874 | static int crypto_rfc4106_decrypt(struct aead_request *req) |
| 875 | { |
| 876 | req = crypto_rfc4106_crypt(req); |
| 877 | |
| 878 | return crypto_aead_decrypt(req); |
| 879 | } |
| 880 | |
| 881 | static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm) |
| 882 | { |
| 883 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
| 884 | struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst); |
| 885 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); |
| 886 | struct crypto_aead *aead; |
| 887 | unsigned long align; |
| 888 | |
| 889 | aead = crypto_spawn_aead(spawn); |
| 890 | if (IS_ERR(aead)) |
| 891 | return PTR_ERR(aead); |
| 892 | |
| 893 | ctx->child = aead; |
| 894 | |
| 895 | align = crypto_aead_alignmask(aead); |
| 896 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 897 | tfm->crt_aead.reqsize = sizeof(struct aead_request) + |
| 898 | ALIGN(crypto_aead_reqsize(aead), |
| 899 | crypto_tfm_ctx_alignment()) + |
| 900 | align + 16; |
| 901 | |
| 902 | return 0; |
| 903 | } |
| 904 | |
| 905 | static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm) |
| 906 | { |
| 907 | struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm); |
| 908 | |
| 909 | crypto_free_aead(ctx->child); |
| 910 | } |
| 911 | |
| 912 | static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb) |
| 913 | { |
| 914 | struct crypto_attr_type *algt; |
| 915 | struct crypto_instance *inst; |
| 916 | struct crypto_aead_spawn *spawn; |
| 917 | struct crypto_alg *alg; |
| 918 | const char *ccm_name; |
| 919 | int err; |
| 920 | |
| 921 | algt = crypto_get_attr_type(tb); |
| 922 | err = PTR_ERR(algt); |
| 923 | if (IS_ERR(algt)) |
| 924 | return ERR_PTR(err); |
| 925 | |
| 926 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 927 | return ERR_PTR(-EINVAL); |
| 928 | |
| 929 | ccm_name = crypto_attr_alg_name(tb[1]); |
| 930 | err = PTR_ERR(ccm_name); |
| 931 | if (IS_ERR(ccm_name)) |
| 932 | return ERR_PTR(err); |
| 933 | |
| 934 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| 935 | if (!inst) |
| 936 | return ERR_PTR(-ENOMEM); |
| 937 | |
| 938 | spawn = crypto_instance_ctx(inst); |
| 939 | crypto_set_aead_spawn(spawn, inst); |
| 940 | err = crypto_grab_aead(spawn, ccm_name, 0, |
| 941 | crypto_requires_sync(algt->type, algt->mask)); |
| 942 | if (err) |
| 943 | goto out_free_inst; |
| 944 | |
| 945 | alg = crypto_aead_spawn_alg(spawn); |
| 946 | |
| 947 | err = -EINVAL; |
| 948 | |
| 949 | /* We only support 16-byte blocks. */ |
| 950 | if (alg->cra_aead.ivsize != 16) |
| 951 | goto out_drop_alg; |
| 952 | |
| 953 | /* Not a stream cipher? */ |
| 954 | if (alg->cra_blocksize != 1) |
| 955 | goto out_drop_alg; |
| 956 | |
| 957 | err = -ENAMETOOLONG; |
| 958 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
| 959 | "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME || |
| 960 | snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 961 | "rfc4106(%s)", alg->cra_driver_name) >= |
| 962 | CRYPTO_MAX_ALG_NAME) |
| 963 | goto out_drop_alg; |
| 964 | |
| 965 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
| 966 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; |
| 967 | inst->alg.cra_priority = alg->cra_priority; |
| 968 | inst->alg.cra_blocksize = 1; |
| 969 | inst->alg.cra_alignmask = alg->cra_alignmask; |
| 970 | inst->alg.cra_type = &crypto_nivaead_type; |
| 971 | |
| 972 | inst->alg.cra_aead.ivsize = 8; |
| 973 | inst->alg.cra_aead.maxauthsize = 16; |
| 974 | |
| 975 | inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
| 976 | |
| 977 | inst->alg.cra_init = crypto_rfc4106_init_tfm; |
| 978 | inst->alg.cra_exit = crypto_rfc4106_exit_tfm; |
| 979 | |
| 980 | inst->alg.cra_aead.setkey = crypto_rfc4106_setkey; |
| 981 | inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize; |
| 982 | inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt; |
| 983 | inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt; |
| 984 | |
| 985 | inst->alg.cra_aead.geniv = "seqiv"; |
| 986 | |
| 987 | out: |
| 988 | return inst; |
| 989 | |
| 990 | out_drop_alg: |
| 991 | crypto_drop_aead(spawn); |
| 992 | out_free_inst: |
| 993 | kfree(inst); |
| 994 | inst = ERR_PTR(err); |
| 995 | goto out; |
| 996 | } |
| 997 | |
| 998 | static void crypto_rfc4106_free(struct crypto_instance *inst) |
| 999 | { |
| 1000 | crypto_drop_spawn(crypto_instance_ctx(inst)); |
| 1001 | kfree(inst); |
| 1002 | } |
| 1003 | |
| 1004 | static struct crypto_template crypto_rfc4106_tmpl = { |
| 1005 | .name = "rfc4106", |
| 1006 | .alloc = crypto_rfc4106_alloc, |
| 1007 | .free = crypto_rfc4106_free, |
| 1008 | .module = THIS_MODULE, |
| 1009 | }; |
| 1010 | |
| 1011 | static int __init crypto_gcm_module_init(void) |
| 1012 | { |
| 1013 | int err; |
| 1014 | |
| 1015 | gcm_zeroes = kzalloc(16, GFP_KERNEL); |
| 1016 | if (!gcm_zeroes) |
| 1017 | return -ENOMEM; |
| 1018 | |
| 1019 | err = crypto_register_template(&crypto_gcm_base_tmpl); |
| 1020 | if (err) |
| 1021 | goto out; |
| 1022 | |
| 1023 | err = crypto_register_template(&crypto_gcm_tmpl); |
| 1024 | if (err) |
| 1025 | goto out_undo_base; |
| 1026 | |
| 1027 | err = crypto_register_template(&crypto_rfc4106_tmpl); |
| 1028 | if (err) |
| 1029 | goto out_undo_gcm; |
| 1030 | |
| 1031 | return 0; |
| 1032 | |
| 1033 | out_undo_gcm: |
| 1034 | crypto_unregister_template(&crypto_gcm_tmpl); |
| 1035 | out_undo_base: |
| 1036 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
| 1037 | out: |
| 1038 | kfree(gcm_zeroes); |
| 1039 | return err; |
| 1040 | } |
| 1041 | |
| 1042 | static void __exit crypto_gcm_module_exit(void) |
| 1043 | { |
| 1044 | kfree(gcm_zeroes); |
| 1045 | crypto_unregister_template(&crypto_rfc4106_tmpl); |
| 1046 | crypto_unregister_template(&crypto_gcm_tmpl); |
| 1047 | crypto_unregister_template(&crypto_gcm_base_tmpl); |
| 1048 | } |
| 1049 | |
| 1050 | module_init(crypto_gcm_module_init); |
| 1051 | module_exit(crypto_gcm_module_exit); |
| 1052 | |
| 1053 | MODULE_LICENSE("GPL"); |
| 1054 | MODULE_DESCRIPTION("Galois/Counter Mode"); |
| 1055 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); |
| 1056 | MODULE_ALIAS("gcm_base"); |
| 1057 | MODULE_ALIAS("rfc4106"); |