| 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/null.h> |
| 16 | #include <crypto/scatterwalk.h> |
| 17 | #include <crypto/gcm.h> |
| 18 | #include <crypto/hash.h> |
| 19 | #include "internal.h" |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/slab.h> |
| 25 | |
| 26 | struct gcm_instance_ctx { |
| 27 | struct crypto_skcipher_spawn ctr; |
| 28 | struct crypto_ahash_spawn ghash; |
| 29 | }; |
| 30 | |
| 31 | struct crypto_gcm_ctx { |
| 32 | struct crypto_skcipher *ctr; |
| 33 | struct crypto_ahash *ghash; |
| 34 | }; |
| 35 | |
| 36 | struct crypto_rfc4106_ctx { |
| 37 | struct crypto_aead *child; |
| 38 | u8 nonce[4]; |
| 39 | }; |
| 40 | |
| 41 | struct crypto_rfc4106_req_ctx { |
| 42 | struct scatterlist src[3]; |
| 43 | struct scatterlist dst[3]; |
| 44 | struct aead_request subreq; |
| 45 | }; |
| 46 | |
| 47 | struct crypto_rfc4543_instance_ctx { |
| 48 | struct crypto_aead_spawn aead; |
| 49 | }; |
| 50 | |
| 51 | struct crypto_rfc4543_ctx { |
| 52 | struct crypto_aead *child; |
| 53 | struct crypto_sync_skcipher *null; |
| 54 | u8 nonce[4]; |
| 55 | }; |
| 56 | |
| 57 | struct crypto_rfc4543_req_ctx { |
| 58 | struct aead_request subreq; |
| 59 | }; |
| 60 | |
| 61 | struct crypto_gcm_ghash_ctx { |
| 62 | unsigned int cryptlen; |
| 63 | struct scatterlist *src; |
| 64 | int (*complete)(struct aead_request *req, u32 flags); |
| 65 | }; |
| 66 | |
| 67 | struct crypto_gcm_req_priv_ctx { |
| 68 | u8 iv[16]; |
| 69 | u8 auth_tag[16]; |
| 70 | u8 iauth_tag[16]; |
| 71 | struct scatterlist src[3]; |
| 72 | struct scatterlist dst[3]; |
| 73 | struct scatterlist sg; |
| 74 | struct crypto_gcm_ghash_ctx ghash_ctx; |
| 75 | union { |
| 76 | struct ahash_request ahreq; |
| 77 | struct skcipher_request skreq; |
| 78 | } u; |
| 79 | }; |
| 80 | |
| 81 | static struct { |
| 82 | u8 buf[16]; |
| 83 | struct scatterlist sg; |
| 84 | } *gcm_zeroes; |
| 85 | |
| 86 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc); |
| 87 | |
| 88 | static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx( |
| 89 | struct aead_request *req) |
| 90 | { |
| 91 | unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); |
| 92 | |
| 93 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); |
| 94 | } |
| 95 | |
| 96 | static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key, |
| 97 | unsigned int keylen) |
| 98 | { |
| 99 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
| 100 | struct crypto_ahash *ghash = ctx->ghash; |
| 101 | struct crypto_skcipher *ctr = ctx->ctr; |
| 102 | struct { |
| 103 | be128 hash; |
| 104 | u8 iv[16]; |
| 105 | |
| 106 | struct crypto_wait wait; |
| 107 | |
| 108 | struct scatterlist sg[1]; |
| 109 | struct skcipher_request req; |
| 110 | } *data; |
| 111 | int err; |
| 112 | |
| 113 | crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); |
| 114 | crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & |
| 115 | CRYPTO_TFM_REQ_MASK); |
| 116 | err = crypto_skcipher_setkey(ctr, key, keylen); |
| 117 | crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) & |
| 118 | CRYPTO_TFM_RES_MASK); |
| 119 | if (err) |
| 120 | return err; |
| 121 | |
| 122 | data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr), |
| 123 | GFP_KERNEL); |
| 124 | if (!data) |
| 125 | return -ENOMEM; |
| 126 | |
| 127 | crypto_init_wait(&data->wait); |
| 128 | sg_init_one(data->sg, &data->hash, sizeof(data->hash)); |
| 129 | skcipher_request_set_tfm(&data->req, ctr); |
| 130 | skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP | |
| 131 | CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 132 | crypto_req_done, |
| 133 | &data->wait); |
| 134 | skcipher_request_set_crypt(&data->req, data->sg, data->sg, |
| 135 | sizeof(data->hash), data->iv); |
| 136 | |
| 137 | err = crypto_wait_req(crypto_skcipher_encrypt(&data->req), |
| 138 | &data->wait); |
| 139 | |
| 140 | if (err) |
| 141 | goto out; |
| 142 | |
| 143 | crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK); |
| 144 | crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) & |
| 145 | CRYPTO_TFM_REQ_MASK); |
| 146 | err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128)); |
| 147 | crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) & |
| 148 | CRYPTO_TFM_RES_MASK); |
| 149 | |
| 150 | out: |
| 151 | kzfree(data); |
| 152 | return err; |
| 153 | } |
| 154 | |
| 155 | static int crypto_gcm_setauthsize(struct crypto_aead *tfm, |
| 156 | unsigned int authsize) |
| 157 | { |
| 158 | switch (authsize) { |
| 159 | case 4: |
| 160 | case 8: |
| 161 | case 12: |
| 162 | case 13: |
| 163 | case 14: |
| 164 | case 15: |
| 165 | case 16: |
| 166 | break; |
| 167 | default: |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | static void crypto_gcm_init_common(struct aead_request *req) |
| 175 | { |
| 176 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 177 | __be32 counter = cpu_to_be32(1); |
| 178 | struct scatterlist *sg; |
| 179 | |
| 180 | memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag)); |
| 181 | memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE); |
| 182 | memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4); |
| 183 | |
| 184 | sg_init_table(pctx->src, 3); |
| 185 | sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| 186 | sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); |
| 187 | if (sg != pctx->src + 1) |
| 188 | sg_chain(pctx->src, 2, sg); |
| 189 | |
| 190 | if (req->src != req->dst) { |
| 191 | sg_init_table(pctx->dst, 3); |
| 192 | sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag)); |
| 193 | sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); |
| 194 | if (sg != pctx->dst + 1) |
| 195 | sg_chain(pctx->dst, 2, sg); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | static void crypto_gcm_init_crypt(struct aead_request *req, |
| 200 | unsigned int cryptlen) |
| 201 | { |
| 202 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 203 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead); |
| 204 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 205 | struct skcipher_request *skreq = &pctx->u.skreq; |
| 206 | struct scatterlist *dst; |
| 207 | |
| 208 | dst = req->src == req->dst ? pctx->src : pctx->dst; |
| 209 | |
| 210 | skcipher_request_set_tfm(skreq, ctx->ctr); |
| 211 | skcipher_request_set_crypt(skreq, pctx->src, dst, |
| 212 | cryptlen + sizeof(pctx->auth_tag), |
| 213 | pctx->iv); |
| 214 | } |
| 215 | |
| 216 | static inline unsigned int gcm_remain(unsigned int len) |
| 217 | { |
| 218 | len &= 0xfU; |
| 219 | return len ? 16 - len : 0; |
| 220 | } |
| 221 | |
| 222 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err); |
| 223 | |
| 224 | static int gcm_hash_update(struct aead_request *req, |
| 225 | crypto_completion_t compl, |
| 226 | struct scatterlist *src, |
| 227 | unsigned int len, u32 flags) |
| 228 | { |
| 229 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 230 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 231 | |
| 232 | ahash_request_set_callback(ahreq, flags, compl, req); |
| 233 | ahash_request_set_crypt(ahreq, src, NULL, len); |
| 234 | |
| 235 | return crypto_ahash_update(ahreq); |
| 236 | } |
| 237 | |
| 238 | static int gcm_hash_remain(struct aead_request *req, |
| 239 | unsigned int remain, |
| 240 | crypto_completion_t compl, u32 flags) |
| 241 | { |
| 242 | return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags); |
| 243 | } |
| 244 | |
| 245 | static int gcm_hash_len(struct aead_request *req, u32 flags) |
| 246 | { |
| 247 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 248 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 249 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 250 | be128 lengths; |
| 251 | |
| 252 | lengths.a = cpu_to_be64(req->assoclen * 8); |
| 253 | lengths.b = cpu_to_be64(gctx->cryptlen * 8); |
| 254 | memcpy(pctx->iauth_tag, &lengths, 16); |
| 255 | sg_init_one(&pctx->sg, pctx->iauth_tag, 16); |
| 256 | ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req); |
| 257 | ahash_request_set_crypt(ahreq, &pctx->sg, |
| 258 | pctx->iauth_tag, sizeof(lengths)); |
| 259 | |
| 260 | return crypto_ahash_finup(ahreq); |
| 261 | } |
| 262 | |
| 263 | static int gcm_hash_len_continue(struct aead_request *req, u32 flags) |
| 264 | { |
| 265 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 266 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 267 | |
| 268 | return gctx->complete(req, flags); |
| 269 | } |
| 270 | |
| 271 | static void gcm_hash_len_done(struct crypto_async_request *areq, int err) |
| 272 | { |
| 273 | struct aead_request *req = areq->data; |
| 274 | |
| 275 | if (err) |
| 276 | goto out; |
| 277 | |
| 278 | err = gcm_hash_len_continue(req, 0); |
| 279 | if (err == -EINPROGRESS) |
| 280 | return; |
| 281 | |
| 282 | out: |
| 283 | aead_request_complete(req, err); |
| 284 | } |
| 285 | |
| 286 | static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags) |
| 287 | { |
| 288 | return gcm_hash_len(req, flags) ?: |
| 289 | gcm_hash_len_continue(req, flags); |
| 290 | } |
| 291 | |
| 292 | static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq, |
| 293 | int err) |
| 294 | { |
| 295 | struct aead_request *req = areq->data; |
| 296 | |
| 297 | if (err) |
| 298 | goto out; |
| 299 | |
| 300 | err = gcm_hash_crypt_remain_continue(req, 0); |
| 301 | if (err == -EINPROGRESS) |
| 302 | return; |
| 303 | |
| 304 | out: |
| 305 | aead_request_complete(req, err); |
| 306 | } |
| 307 | |
| 308 | static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags) |
| 309 | { |
| 310 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 311 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 312 | unsigned int remain; |
| 313 | |
| 314 | remain = gcm_remain(gctx->cryptlen); |
| 315 | if (remain) |
| 316 | return gcm_hash_remain(req, remain, |
| 317 | gcm_hash_crypt_remain_done, flags) ?: |
| 318 | gcm_hash_crypt_remain_continue(req, flags); |
| 319 | |
| 320 | return gcm_hash_crypt_remain_continue(req, flags); |
| 321 | } |
| 322 | |
| 323 | static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err) |
| 324 | { |
| 325 | struct aead_request *req = areq->data; |
| 326 | |
| 327 | if (err) |
| 328 | goto out; |
| 329 | |
| 330 | err = gcm_hash_crypt_continue(req, 0); |
| 331 | if (err == -EINPROGRESS) |
| 332 | return; |
| 333 | |
| 334 | out: |
| 335 | aead_request_complete(req, err); |
| 336 | } |
| 337 | |
| 338 | static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags) |
| 339 | { |
| 340 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 341 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 342 | |
| 343 | if (gctx->cryptlen) |
| 344 | return gcm_hash_update(req, gcm_hash_crypt_done, |
| 345 | gctx->src, gctx->cryptlen, flags) ?: |
| 346 | gcm_hash_crypt_continue(req, flags); |
| 347 | |
| 348 | return gcm_hash_crypt_remain_continue(req, flags); |
| 349 | } |
| 350 | |
| 351 | static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq, |
| 352 | int err) |
| 353 | { |
| 354 | struct aead_request *req = areq->data; |
| 355 | |
| 356 | if (err) |
| 357 | goto out; |
| 358 | |
| 359 | err = gcm_hash_assoc_remain_continue(req, 0); |
| 360 | if (err == -EINPROGRESS) |
| 361 | return; |
| 362 | |
| 363 | out: |
| 364 | aead_request_complete(req, err); |
| 365 | } |
| 366 | |
| 367 | static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags) |
| 368 | { |
| 369 | unsigned int remain; |
| 370 | |
| 371 | remain = gcm_remain(req->assoclen); |
| 372 | if (remain) |
| 373 | return gcm_hash_remain(req, remain, |
| 374 | gcm_hash_assoc_remain_done, flags) ?: |
| 375 | gcm_hash_assoc_remain_continue(req, flags); |
| 376 | |
| 377 | return gcm_hash_assoc_remain_continue(req, flags); |
| 378 | } |
| 379 | |
| 380 | static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err) |
| 381 | { |
| 382 | struct aead_request *req = areq->data; |
| 383 | |
| 384 | if (err) |
| 385 | goto out; |
| 386 | |
| 387 | err = gcm_hash_assoc_continue(req, 0); |
| 388 | if (err == -EINPROGRESS) |
| 389 | return; |
| 390 | |
| 391 | out: |
| 392 | aead_request_complete(req, err); |
| 393 | } |
| 394 | |
| 395 | static int gcm_hash_init_continue(struct aead_request *req, u32 flags) |
| 396 | { |
| 397 | if (req->assoclen) |
| 398 | return gcm_hash_update(req, gcm_hash_assoc_done, |
| 399 | req->src, req->assoclen, flags) ?: |
| 400 | gcm_hash_assoc_continue(req, flags); |
| 401 | |
| 402 | return gcm_hash_assoc_remain_continue(req, flags); |
| 403 | } |
| 404 | |
| 405 | static void gcm_hash_init_done(struct crypto_async_request *areq, int err) |
| 406 | { |
| 407 | struct aead_request *req = areq->data; |
| 408 | |
| 409 | if (err) |
| 410 | goto out; |
| 411 | |
| 412 | err = gcm_hash_init_continue(req, 0); |
| 413 | if (err == -EINPROGRESS) |
| 414 | return; |
| 415 | |
| 416 | out: |
| 417 | aead_request_complete(req, err); |
| 418 | } |
| 419 | |
| 420 | static int gcm_hash(struct aead_request *req, u32 flags) |
| 421 | { |
| 422 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 423 | struct ahash_request *ahreq = &pctx->u.ahreq; |
| 424 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
| 425 | |
| 426 | ahash_request_set_tfm(ahreq, ctx->ghash); |
| 427 | |
| 428 | ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req); |
| 429 | return crypto_ahash_init(ahreq) ?: |
| 430 | gcm_hash_init_continue(req, flags); |
| 431 | } |
| 432 | |
| 433 | static int gcm_enc_copy_hash(struct aead_request *req, u32 flags) |
| 434 | { |
| 435 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 436 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 437 | u8 *auth_tag = pctx->auth_tag; |
| 438 | |
| 439 | crypto_xor(auth_tag, pctx->iauth_tag, 16); |
| 440 | scatterwalk_map_and_copy(auth_tag, req->dst, |
| 441 | req->assoclen + req->cryptlen, |
| 442 | crypto_aead_authsize(aead), 1); |
| 443 | return 0; |
| 444 | } |
| 445 | |
| 446 | static int gcm_encrypt_continue(struct aead_request *req, u32 flags) |
| 447 | { |
| 448 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 449 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 450 | |
| 451 | gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst); |
| 452 | gctx->cryptlen = req->cryptlen; |
| 453 | gctx->complete = gcm_enc_copy_hash; |
| 454 | |
| 455 | return gcm_hash(req, flags); |
| 456 | } |
| 457 | |
| 458 | static void gcm_encrypt_done(struct crypto_async_request *areq, int err) |
| 459 | { |
| 460 | struct aead_request *req = areq->data; |
| 461 | |
| 462 | if (err) |
| 463 | goto out; |
| 464 | |
| 465 | err = gcm_encrypt_continue(req, 0); |
| 466 | if (err == -EINPROGRESS) |
| 467 | return; |
| 468 | |
| 469 | out: |
| 470 | aead_request_complete(req, err); |
| 471 | } |
| 472 | |
| 473 | static int crypto_gcm_encrypt(struct aead_request *req) |
| 474 | { |
| 475 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 476 | struct skcipher_request *skreq = &pctx->u.skreq; |
| 477 | u32 flags = aead_request_flags(req); |
| 478 | |
| 479 | crypto_gcm_init_common(req); |
| 480 | crypto_gcm_init_crypt(req, req->cryptlen); |
| 481 | skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req); |
| 482 | |
| 483 | return crypto_skcipher_encrypt(skreq) ?: |
| 484 | gcm_encrypt_continue(req, flags); |
| 485 | } |
| 486 | |
| 487 | static int crypto_gcm_verify(struct aead_request *req) |
| 488 | { |
| 489 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 490 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 491 | u8 *auth_tag = pctx->auth_tag; |
| 492 | u8 *iauth_tag = pctx->iauth_tag; |
| 493 | unsigned int authsize = crypto_aead_authsize(aead); |
| 494 | unsigned int cryptlen = req->cryptlen - authsize; |
| 495 | |
| 496 | crypto_xor(auth_tag, iauth_tag, 16); |
| 497 | scatterwalk_map_and_copy(iauth_tag, req->src, |
| 498 | req->assoclen + cryptlen, authsize, 0); |
| 499 | return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0; |
| 500 | } |
| 501 | |
| 502 | static void gcm_decrypt_done(struct crypto_async_request *areq, int err) |
| 503 | { |
| 504 | struct aead_request *req = areq->data; |
| 505 | |
| 506 | if (!err) |
| 507 | err = crypto_gcm_verify(req); |
| 508 | |
| 509 | aead_request_complete(req, err); |
| 510 | } |
| 511 | |
| 512 | static int gcm_dec_hash_continue(struct aead_request *req, u32 flags) |
| 513 | { |
| 514 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 515 | struct skcipher_request *skreq = &pctx->u.skreq; |
| 516 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 517 | |
| 518 | crypto_gcm_init_crypt(req, gctx->cryptlen); |
| 519 | skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req); |
| 520 | return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req); |
| 521 | } |
| 522 | |
| 523 | static int crypto_gcm_decrypt(struct aead_request *req) |
| 524 | { |
| 525 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 526 | struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req); |
| 527 | struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx; |
| 528 | unsigned int authsize = crypto_aead_authsize(aead); |
| 529 | unsigned int cryptlen = req->cryptlen; |
| 530 | u32 flags = aead_request_flags(req); |
| 531 | |
| 532 | cryptlen -= authsize; |
| 533 | |
| 534 | crypto_gcm_init_common(req); |
| 535 | |
| 536 | gctx->src = sg_next(pctx->src); |
| 537 | gctx->cryptlen = cryptlen; |
| 538 | gctx->complete = gcm_dec_hash_continue; |
| 539 | |
| 540 | return gcm_hash(req, flags); |
| 541 | } |
| 542 | |
| 543 | static int crypto_gcm_init_tfm(struct crypto_aead *tfm) |
| 544 | { |
| 545 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 546 | struct gcm_instance_ctx *ictx = aead_instance_ctx(inst); |
| 547 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
| 548 | struct crypto_skcipher *ctr; |
| 549 | struct crypto_ahash *ghash; |
| 550 | unsigned long align; |
| 551 | int err; |
| 552 | |
| 553 | ghash = crypto_spawn_ahash(&ictx->ghash); |
| 554 | if (IS_ERR(ghash)) |
| 555 | return PTR_ERR(ghash); |
| 556 | |
| 557 | ctr = crypto_spawn_skcipher(&ictx->ctr); |
| 558 | err = PTR_ERR(ctr); |
| 559 | if (IS_ERR(ctr)) |
| 560 | goto err_free_hash; |
| 561 | |
| 562 | ctx->ctr = ctr; |
| 563 | ctx->ghash = ghash; |
| 564 | |
| 565 | align = crypto_aead_alignmask(tfm); |
| 566 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 567 | crypto_aead_set_reqsize(tfm, |
| 568 | align + offsetof(struct crypto_gcm_req_priv_ctx, u) + |
| 569 | max(sizeof(struct skcipher_request) + |
| 570 | crypto_skcipher_reqsize(ctr), |
| 571 | sizeof(struct ahash_request) + |
| 572 | crypto_ahash_reqsize(ghash))); |
| 573 | |
| 574 | return 0; |
| 575 | |
| 576 | err_free_hash: |
| 577 | crypto_free_ahash(ghash); |
| 578 | return err; |
| 579 | } |
| 580 | |
| 581 | static void crypto_gcm_exit_tfm(struct crypto_aead *tfm) |
| 582 | { |
| 583 | struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm); |
| 584 | |
| 585 | crypto_free_ahash(ctx->ghash); |
| 586 | crypto_free_skcipher(ctx->ctr); |
| 587 | } |
| 588 | |
| 589 | static void crypto_gcm_free(struct aead_instance *inst) |
| 590 | { |
| 591 | struct gcm_instance_ctx *ctx = aead_instance_ctx(inst); |
| 592 | |
| 593 | crypto_drop_skcipher(&ctx->ctr); |
| 594 | crypto_drop_ahash(&ctx->ghash); |
| 595 | kfree(inst); |
| 596 | } |
| 597 | |
| 598 | static int crypto_gcm_create_common(struct crypto_template *tmpl, |
| 599 | struct rtattr **tb, |
| 600 | const char *ctr_name, |
| 601 | const char *ghash_name) |
| 602 | { |
| 603 | struct crypto_attr_type *algt; |
| 604 | struct aead_instance *inst; |
| 605 | struct skcipher_alg *ctr; |
| 606 | struct crypto_alg *ghash_alg; |
| 607 | struct hash_alg_common *ghash; |
| 608 | struct gcm_instance_ctx *ctx; |
| 609 | int err; |
| 610 | |
| 611 | algt = crypto_get_attr_type(tb); |
| 612 | if (IS_ERR(algt)) |
| 613 | return PTR_ERR(algt); |
| 614 | |
| 615 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 616 | return -EINVAL; |
| 617 | |
| 618 | ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type, |
| 619 | CRYPTO_ALG_TYPE_HASH, |
| 620 | CRYPTO_ALG_TYPE_AHASH_MASK | |
| 621 | crypto_requires_sync(algt->type, |
| 622 | algt->mask)); |
| 623 | if (IS_ERR(ghash_alg)) |
| 624 | return PTR_ERR(ghash_alg); |
| 625 | |
| 626 | ghash = __crypto_hash_alg_common(ghash_alg); |
| 627 | |
| 628 | err = -ENOMEM; |
| 629 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 630 | if (!inst) |
| 631 | goto out_put_ghash; |
| 632 | |
| 633 | ctx = aead_instance_ctx(inst); |
| 634 | err = crypto_init_ahash_spawn(&ctx->ghash, ghash, |
| 635 | aead_crypto_instance(inst)); |
| 636 | if (err) |
| 637 | goto err_free_inst; |
| 638 | |
| 639 | err = -EINVAL; |
| 640 | if (strcmp(ghash->base.cra_name, "ghash") != 0 || |
| 641 | ghash->digestsize != 16) |
| 642 | goto err_drop_ghash; |
| 643 | |
| 644 | crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst)); |
| 645 | err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0, |
| 646 | crypto_requires_sync(algt->type, |
| 647 | algt->mask)); |
| 648 | if (err) |
| 649 | goto err_drop_ghash; |
| 650 | |
| 651 | ctr = crypto_spawn_skcipher_alg(&ctx->ctr); |
| 652 | |
| 653 | /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
| 654 | err = -EINVAL; |
| 655 | if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || |
| 656 | crypto_skcipher_alg_ivsize(ctr) != 16 || |
| 657 | ctr->base.cra_blocksize != 1) |
| 658 | goto out_put_ctr; |
| 659 | |
| 660 | err = -ENAMETOOLONG; |
| 661 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 662 | "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) |
| 663 | goto out_put_ctr; |
| 664 | |
| 665 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 666 | "gcm_base(%s,%s)", ctr->base.cra_driver_name, |
| 667 | ghash_alg->cra_driver_name) >= |
| 668 | CRYPTO_MAX_ALG_NAME) |
| 669 | goto out_put_ctr; |
| 670 | |
| 671 | inst->alg.base.cra_flags = (ghash->base.cra_flags | |
| 672 | ctr->base.cra_flags) & CRYPTO_ALG_ASYNC; |
| 673 | inst->alg.base.cra_priority = (ghash->base.cra_priority + |
| 674 | ctr->base.cra_priority) / 2; |
| 675 | inst->alg.base.cra_blocksize = 1; |
| 676 | inst->alg.base.cra_alignmask = ghash->base.cra_alignmask | |
| 677 | ctr->base.cra_alignmask; |
| 678 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx); |
| 679 | inst->alg.ivsize = GCM_AES_IV_SIZE; |
| 680 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); |
| 681 | inst->alg.maxauthsize = 16; |
| 682 | inst->alg.init = crypto_gcm_init_tfm; |
| 683 | inst->alg.exit = crypto_gcm_exit_tfm; |
| 684 | inst->alg.setkey = crypto_gcm_setkey; |
| 685 | inst->alg.setauthsize = crypto_gcm_setauthsize; |
| 686 | inst->alg.encrypt = crypto_gcm_encrypt; |
| 687 | inst->alg.decrypt = crypto_gcm_decrypt; |
| 688 | |
| 689 | inst->free = crypto_gcm_free; |
| 690 | |
| 691 | err = aead_register_instance(tmpl, inst); |
| 692 | if (err) |
| 693 | goto out_put_ctr; |
| 694 | |
| 695 | out_put_ghash: |
| 696 | crypto_mod_put(ghash_alg); |
| 697 | return err; |
| 698 | |
| 699 | out_put_ctr: |
| 700 | crypto_drop_skcipher(&ctx->ctr); |
| 701 | err_drop_ghash: |
| 702 | crypto_drop_ahash(&ctx->ghash); |
| 703 | err_free_inst: |
| 704 | kfree(inst); |
| 705 | goto out_put_ghash; |
| 706 | } |
| 707 | |
| 708 | static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb) |
| 709 | { |
| 710 | const char *cipher_name; |
| 711 | char ctr_name[CRYPTO_MAX_ALG_NAME]; |
| 712 | |
| 713 | cipher_name = crypto_attr_alg_name(tb[1]); |
| 714 | if (IS_ERR(cipher_name)) |
| 715 | return PTR_ERR(cipher_name); |
| 716 | |
| 717 | if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >= |
| 718 | CRYPTO_MAX_ALG_NAME) |
| 719 | return -ENAMETOOLONG; |
| 720 | |
| 721 | return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash"); |
| 722 | } |
| 723 | |
| 724 | static int crypto_gcm_base_create(struct crypto_template *tmpl, |
| 725 | struct rtattr **tb) |
| 726 | { |
| 727 | const char *ctr_name; |
| 728 | const char *ghash_name; |
| 729 | |
| 730 | ctr_name = crypto_attr_alg_name(tb[1]); |
| 731 | if (IS_ERR(ctr_name)) |
| 732 | return PTR_ERR(ctr_name); |
| 733 | |
| 734 | ghash_name = crypto_attr_alg_name(tb[2]); |
| 735 | if (IS_ERR(ghash_name)) |
| 736 | return PTR_ERR(ghash_name); |
| 737 | |
| 738 | return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name); |
| 739 | } |
| 740 | |
| 741 | static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key, |
| 742 | unsigned int keylen) |
| 743 | { |
| 744 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); |
| 745 | struct crypto_aead *child = ctx->child; |
| 746 | int err; |
| 747 | |
| 748 | if (keylen < 4) |
| 749 | return -EINVAL; |
| 750 | |
| 751 | keylen -= 4; |
| 752 | memcpy(ctx->nonce, key + keylen, 4); |
| 753 | |
| 754 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
| 755 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & |
| 756 | CRYPTO_TFM_REQ_MASK); |
| 757 | err = crypto_aead_setkey(child, key, keylen); |
| 758 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & |
| 759 | CRYPTO_TFM_RES_MASK); |
| 760 | |
| 761 | return err; |
| 762 | } |
| 763 | |
| 764 | static int crypto_rfc4106_setauthsize(struct crypto_aead *parent, |
| 765 | unsigned int authsize) |
| 766 | { |
| 767 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent); |
| 768 | |
| 769 | switch (authsize) { |
| 770 | case 8: |
| 771 | case 12: |
| 772 | case 16: |
| 773 | break; |
| 774 | default: |
| 775 | return -EINVAL; |
| 776 | } |
| 777 | |
| 778 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 779 | } |
| 780 | |
| 781 | static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req) |
| 782 | { |
| 783 | struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req); |
| 784 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 785 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead); |
| 786 | struct aead_request *subreq = &rctx->subreq; |
| 787 | struct crypto_aead *child = ctx->child; |
| 788 | struct scatterlist *sg; |
| 789 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
| 790 | crypto_aead_alignmask(child) + 1); |
| 791 | |
| 792 | scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0); |
| 793 | |
| 794 | memcpy(iv, ctx->nonce, 4); |
| 795 | memcpy(iv + 4, req->iv, 8); |
| 796 | |
| 797 | sg_init_table(rctx->src, 3); |
| 798 | sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
| 799 | sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); |
| 800 | if (sg != rctx->src + 1) |
| 801 | sg_chain(rctx->src, 2, sg); |
| 802 | |
| 803 | if (req->src != req->dst) { |
| 804 | sg_init_table(rctx->dst, 3); |
| 805 | sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8); |
| 806 | sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); |
| 807 | if (sg != rctx->dst + 1) |
| 808 | sg_chain(rctx->dst, 2, sg); |
| 809 | } |
| 810 | |
| 811 | aead_request_set_tfm(subreq, child); |
| 812 | aead_request_set_callback(subreq, req->base.flags, req->base.complete, |
| 813 | req->base.data); |
| 814 | aead_request_set_crypt(subreq, rctx->src, |
| 815 | req->src == req->dst ? rctx->src : rctx->dst, |
| 816 | req->cryptlen, iv); |
| 817 | aead_request_set_ad(subreq, req->assoclen - 8); |
| 818 | |
| 819 | return subreq; |
| 820 | } |
| 821 | |
| 822 | static int crypto_rfc4106_encrypt(struct aead_request *req) |
| 823 | { |
| 824 | if (req->assoclen != 16 && req->assoclen != 20) |
| 825 | return -EINVAL; |
| 826 | |
| 827 | req = crypto_rfc4106_crypt(req); |
| 828 | |
| 829 | return crypto_aead_encrypt(req); |
| 830 | } |
| 831 | |
| 832 | static int crypto_rfc4106_decrypt(struct aead_request *req) |
| 833 | { |
| 834 | if (req->assoclen != 16 && req->assoclen != 20) |
| 835 | return -EINVAL; |
| 836 | |
| 837 | req = crypto_rfc4106_crypt(req); |
| 838 | |
| 839 | return crypto_aead_decrypt(req); |
| 840 | } |
| 841 | |
| 842 | static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm) |
| 843 | { |
| 844 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 845 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); |
| 846 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
| 847 | struct crypto_aead *aead; |
| 848 | unsigned long align; |
| 849 | |
| 850 | aead = crypto_spawn_aead(spawn); |
| 851 | if (IS_ERR(aead)) |
| 852 | return PTR_ERR(aead); |
| 853 | |
| 854 | ctx->child = aead; |
| 855 | |
| 856 | align = crypto_aead_alignmask(aead); |
| 857 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 858 | crypto_aead_set_reqsize( |
| 859 | tfm, |
| 860 | sizeof(struct crypto_rfc4106_req_ctx) + |
| 861 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| 862 | align + 24); |
| 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm) |
| 868 | { |
| 869 | struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm); |
| 870 | |
| 871 | crypto_free_aead(ctx->child); |
| 872 | } |
| 873 | |
| 874 | static void crypto_rfc4106_free(struct aead_instance *inst) |
| 875 | { |
| 876 | crypto_drop_aead(aead_instance_ctx(inst)); |
| 877 | kfree(inst); |
| 878 | } |
| 879 | |
| 880 | static int crypto_rfc4106_create(struct crypto_template *tmpl, |
| 881 | struct rtattr **tb) |
| 882 | { |
| 883 | struct crypto_attr_type *algt; |
| 884 | struct aead_instance *inst; |
| 885 | struct crypto_aead_spawn *spawn; |
| 886 | struct aead_alg *alg; |
| 887 | const char *ccm_name; |
| 888 | int err; |
| 889 | |
| 890 | algt = crypto_get_attr_type(tb); |
| 891 | if (IS_ERR(algt)) |
| 892 | return PTR_ERR(algt); |
| 893 | |
| 894 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 895 | return -EINVAL; |
| 896 | |
| 897 | ccm_name = crypto_attr_alg_name(tb[1]); |
| 898 | if (IS_ERR(ccm_name)) |
| 899 | return PTR_ERR(ccm_name); |
| 900 | |
| 901 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| 902 | if (!inst) |
| 903 | return -ENOMEM; |
| 904 | |
| 905 | spawn = aead_instance_ctx(inst); |
| 906 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
| 907 | err = crypto_grab_aead(spawn, ccm_name, 0, |
| 908 | crypto_requires_sync(algt->type, algt->mask)); |
| 909 | if (err) |
| 910 | goto out_free_inst; |
| 911 | |
| 912 | alg = crypto_spawn_aead_alg(spawn); |
| 913 | |
| 914 | err = -EINVAL; |
| 915 | |
| 916 | /* Underlying IV size must be 12. */ |
| 917 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
| 918 | goto out_drop_alg; |
| 919 | |
| 920 | /* Not a stream cipher? */ |
| 921 | if (alg->base.cra_blocksize != 1) |
| 922 | goto out_drop_alg; |
| 923 | |
| 924 | err = -ENAMETOOLONG; |
| 925 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 926 | "rfc4106(%s)", alg->base.cra_name) >= |
| 927 | CRYPTO_MAX_ALG_NAME || |
| 928 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 929 | "rfc4106(%s)", alg->base.cra_driver_name) >= |
| 930 | CRYPTO_MAX_ALG_NAME) |
| 931 | goto out_drop_alg; |
| 932 | |
| 933 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
| 934 | inst->alg.base.cra_priority = alg->base.cra_priority; |
| 935 | inst->alg.base.cra_blocksize = 1; |
| 936 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| 937 | |
| 938 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx); |
| 939 | |
| 940 | inst->alg.ivsize = GCM_RFC4106_IV_SIZE; |
| 941 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
| 942 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
| 943 | |
| 944 | inst->alg.init = crypto_rfc4106_init_tfm; |
| 945 | inst->alg.exit = crypto_rfc4106_exit_tfm; |
| 946 | |
| 947 | inst->alg.setkey = crypto_rfc4106_setkey; |
| 948 | inst->alg.setauthsize = crypto_rfc4106_setauthsize; |
| 949 | inst->alg.encrypt = crypto_rfc4106_encrypt; |
| 950 | inst->alg.decrypt = crypto_rfc4106_decrypt; |
| 951 | |
| 952 | inst->free = crypto_rfc4106_free; |
| 953 | |
| 954 | err = aead_register_instance(tmpl, inst); |
| 955 | if (err) |
| 956 | goto out_drop_alg; |
| 957 | |
| 958 | out: |
| 959 | return err; |
| 960 | |
| 961 | out_drop_alg: |
| 962 | crypto_drop_aead(spawn); |
| 963 | out_free_inst: |
| 964 | kfree(inst); |
| 965 | goto out; |
| 966 | } |
| 967 | |
| 968 | static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |
| 969 | unsigned int keylen) |
| 970 | { |
| 971 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); |
| 972 | struct crypto_aead *child = ctx->child; |
| 973 | int err; |
| 974 | |
| 975 | if (keylen < 4) |
| 976 | return -EINVAL; |
| 977 | |
| 978 | keylen -= 4; |
| 979 | memcpy(ctx->nonce, key + keylen, 4); |
| 980 | |
| 981 | crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); |
| 982 | crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & |
| 983 | CRYPTO_TFM_REQ_MASK); |
| 984 | err = crypto_aead_setkey(child, key, keylen); |
| 985 | crypto_aead_set_flags(parent, crypto_aead_get_flags(child) & |
| 986 | CRYPTO_TFM_RES_MASK); |
| 987 | |
| 988 | return err; |
| 989 | } |
| 990 | |
| 991 | static int crypto_rfc4543_setauthsize(struct crypto_aead *parent, |
| 992 | unsigned int authsize) |
| 993 | { |
| 994 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent); |
| 995 | |
| 996 | if (authsize != 16) |
| 997 | return -EINVAL; |
| 998 | |
| 999 | return crypto_aead_setauthsize(ctx->child, authsize); |
| 1000 | } |
| 1001 | |
| 1002 | static int crypto_rfc4543_crypt(struct aead_request *req, bool enc) |
| 1003 | { |
| 1004 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 1005 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); |
| 1006 | struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req); |
| 1007 | struct aead_request *subreq = &rctx->subreq; |
| 1008 | unsigned int authsize = crypto_aead_authsize(aead); |
| 1009 | u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child), |
| 1010 | crypto_aead_alignmask(ctx->child) + 1); |
| 1011 | int err; |
| 1012 | |
| 1013 | if (req->src != req->dst) { |
| 1014 | err = crypto_rfc4543_copy_src_to_dst(req, enc); |
| 1015 | if (err) |
| 1016 | return err; |
| 1017 | } |
| 1018 | |
| 1019 | memcpy(iv, ctx->nonce, 4); |
| 1020 | memcpy(iv + 4, req->iv, 8); |
| 1021 | |
| 1022 | aead_request_set_tfm(subreq, ctx->child); |
| 1023 | aead_request_set_callback(subreq, req->base.flags, |
| 1024 | req->base.complete, req->base.data); |
| 1025 | aead_request_set_crypt(subreq, req->src, req->dst, |
| 1026 | enc ? 0 : authsize, iv); |
| 1027 | aead_request_set_ad(subreq, req->assoclen + req->cryptlen - |
| 1028 | subreq->cryptlen); |
| 1029 | |
| 1030 | return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq); |
| 1031 | } |
| 1032 | |
| 1033 | static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc) |
| 1034 | { |
| 1035 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 1036 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead); |
| 1037 | unsigned int authsize = crypto_aead_authsize(aead); |
| 1038 | unsigned int nbytes = req->assoclen + req->cryptlen - |
| 1039 | (enc ? 0 : authsize); |
| 1040 | SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null); |
| 1041 | |
| 1042 | skcipher_request_set_sync_tfm(nreq, ctx->null); |
| 1043 | skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL); |
| 1044 | skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL); |
| 1045 | |
| 1046 | return crypto_skcipher_encrypt(nreq); |
| 1047 | } |
| 1048 | |
| 1049 | static int crypto_rfc4543_encrypt(struct aead_request *req) |
| 1050 | { |
| 1051 | return crypto_rfc4543_crypt(req, true); |
| 1052 | } |
| 1053 | |
| 1054 | static int crypto_rfc4543_decrypt(struct aead_request *req) |
| 1055 | { |
| 1056 | return crypto_rfc4543_crypt(req, false); |
| 1057 | } |
| 1058 | |
| 1059 | static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm) |
| 1060 | { |
| 1061 | struct aead_instance *inst = aead_alg_instance(tfm); |
| 1062 | struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst); |
| 1063 | struct crypto_aead_spawn *spawn = &ictx->aead; |
| 1064 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
| 1065 | struct crypto_aead *aead; |
| 1066 | struct crypto_sync_skcipher *null; |
| 1067 | unsigned long align; |
| 1068 | int err = 0; |
| 1069 | |
| 1070 | aead = crypto_spawn_aead(spawn); |
| 1071 | if (IS_ERR(aead)) |
| 1072 | return PTR_ERR(aead); |
| 1073 | |
| 1074 | null = crypto_get_default_null_skcipher(); |
| 1075 | err = PTR_ERR(null); |
| 1076 | if (IS_ERR(null)) |
| 1077 | goto err_free_aead; |
| 1078 | |
| 1079 | ctx->child = aead; |
| 1080 | ctx->null = null; |
| 1081 | |
| 1082 | align = crypto_aead_alignmask(aead); |
| 1083 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 1084 | crypto_aead_set_reqsize( |
| 1085 | tfm, |
| 1086 | sizeof(struct crypto_rfc4543_req_ctx) + |
| 1087 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| 1088 | align + GCM_AES_IV_SIZE); |
| 1089 | |
| 1090 | return 0; |
| 1091 | |
| 1092 | err_free_aead: |
| 1093 | crypto_free_aead(aead); |
| 1094 | return err; |
| 1095 | } |
| 1096 | |
| 1097 | static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm) |
| 1098 | { |
| 1099 | struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm); |
| 1100 | |
| 1101 | crypto_free_aead(ctx->child); |
| 1102 | crypto_put_default_null_skcipher(); |
| 1103 | } |
| 1104 | |
| 1105 | static void crypto_rfc4543_free(struct aead_instance *inst) |
| 1106 | { |
| 1107 | struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst); |
| 1108 | |
| 1109 | crypto_drop_aead(&ctx->aead); |
| 1110 | |
| 1111 | kfree(inst); |
| 1112 | } |
| 1113 | |
| 1114 | static int crypto_rfc4543_create(struct crypto_template *tmpl, |
| 1115 | struct rtattr **tb) |
| 1116 | { |
| 1117 | struct crypto_attr_type *algt; |
| 1118 | struct aead_instance *inst; |
| 1119 | struct crypto_aead_spawn *spawn; |
| 1120 | struct aead_alg *alg; |
| 1121 | struct crypto_rfc4543_instance_ctx *ctx; |
| 1122 | const char *ccm_name; |
| 1123 | int err; |
| 1124 | |
| 1125 | algt = crypto_get_attr_type(tb); |
| 1126 | if (IS_ERR(algt)) |
| 1127 | return PTR_ERR(algt); |
| 1128 | |
| 1129 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
| 1130 | return -EINVAL; |
| 1131 | |
| 1132 | ccm_name = crypto_attr_alg_name(tb[1]); |
| 1133 | if (IS_ERR(ccm_name)) |
| 1134 | return PTR_ERR(ccm_name); |
| 1135 | |
| 1136 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
| 1137 | if (!inst) |
| 1138 | return -ENOMEM; |
| 1139 | |
| 1140 | ctx = aead_instance_ctx(inst); |
| 1141 | spawn = &ctx->aead; |
| 1142 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
| 1143 | err = crypto_grab_aead(spawn, ccm_name, 0, |
| 1144 | crypto_requires_sync(algt->type, algt->mask)); |
| 1145 | if (err) |
| 1146 | goto out_free_inst; |
| 1147 | |
| 1148 | alg = crypto_spawn_aead_alg(spawn); |
| 1149 | |
| 1150 | err = -EINVAL; |
| 1151 | |
| 1152 | /* Underlying IV size must be 12. */ |
| 1153 | if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) |
| 1154 | goto out_drop_alg; |
| 1155 | |
| 1156 | /* Not a stream cipher? */ |
| 1157 | if (alg->base.cra_blocksize != 1) |
| 1158 | goto out_drop_alg; |
| 1159 | |
| 1160 | err = -ENAMETOOLONG; |
| 1161 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 1162 | "rfc4543(%s)", alg->base.cra_name) >= |
| 1163 | CRYPTO_MAX_ALG_NAME || |
| 1164 | snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 1165 | "rfc4543(%s)", alg->base.cra_driver_name) >= |
| 1166 | CRYPTO_MAX_ALG_NAME) |
| 1167 | goto out_drop_alg; |
| 1168 | |
| 1169 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
| 1170 | inst->alg.base.cra_priority = alg->base.cra_priority; |
| 1171 | inst->alg.base.cra_blocksize = 1; |
| 1172 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| 1173 | |
| 1174 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx); |
| 1175 | |
| 1176 | inst->alg.ivsize = GCM_RFC4543_IV_SIZE; |
| 1177 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
| 1178 | inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg); |
| 1179 | |
| 1180 | inst->alg.init = crypto_rfc4543_init_tfm; |
| 1181 | inst->alg.exit = crypto_rfc4543_exit_tfm; |
| 1182 | |
| 1183 | inst->alg.setkey = crypto_rfc4543_setkey; |
| 1184 | inst->alg.setauthsize = crypto_rfc4543_setauthsize; |
| 1185 | inst->alg.encrypt = crypto_rfc4543_encrypt; |
| 1186 | inst->alg.decrypt = crypto_rfc4543_decrypt; |
| 1187 | |
| 1188 | inst->free = crypto_rfc4543_free, |
| 1189 | |
| 1190 | err = aead_register_instance(tmpl, inst); |
| 1191 | if (err) |
| 1192 | goto out_drop_alg; |
| 1193 | |
| 1194 | out: |
| 1195 | return err; |
| 1196 | |
| 1197 | out_drop_alg: |
| 1198 | crypto_drop_aead(spawn); |
| 1199 | out_free_inst: |
| 1200 | kfree(inst); |
| 1201 | goto out; |
| 1202 | } |
| 1203 | |
| 1204 | static struct crypto_template crypto_gcm_tmpls[] = { |
| 1205 | { |
| 1206 | .name = "gcm_base", |
| 1207 | .create = crypto_gcm_base_create, |
| 1208 | .module = THIS_MODULE, |
| 1209 | }, { |
| 1210 | .name = "gcm", |
| 1211 | .create = crypto_gcm_create, |
| 1212 | .module = THIS_MODULE, |
| 1213 | }, { |
| 1214 | .name = "rfc4106", |
| 1215 | .create = crypto_rfc4106_create, |
| 1216 | .module = THIS_MODULE, |
| 1217 | }, { |
| 1218 | .name = "rfc4543", |
| 1219 | .create = crypto_rfc4543_create, |
| 1220 | .module = THIS_MODULE, |
| 1221 | }, |
| 1222 | }; |
| 1223 | |
| 1224 | static int __init crypto_gcm_module_init(void) |
| 1225 | { |
| 1226 | int err; |
| 1227 | |
| 1228 | gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL); |
| 1229 | if (!gcm_zeroes) |
| 1230 | return -ENOMEM; |
| 1231 | |
| 1232 | sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf)); |
| 1233 | |
| 1234 | err = crypto_register_templates(crypto_gcm_tmpls, |
| 1235 | ARRAY_SIZE(crypto_gcm_tmpls)); |
| 1236 | if (err) |
| 1237 | kfree(gcm_zeroes); |
| 1238 | |
| 1239 | return err; |
| 1240 | } |
| 1241 | |
| 1242 | static void __exit crypto_gcm_module_exit(void) |
| 1243 | { |
| 1244 | kfree(gcm_zeroes); |
| 1245 | crypto_unregister_templates(crypto_gcm_tmpls, |
| 1246 | ARRAY_SIZE(crypto_gcm_tmpls)); |
| 1247 | } |
| 1248 | |
| 1249 | subsys_initcall(crypto_gcm_module_init); |
| 1250 | module_exit(crypto_gcm_module_exit); |
| 1251 | |
| 1252 | MODULE_LICENSE("GPL"); |
| 1253 | MODULE_DESCRIPTION("Galois/Counter Mode"); |
| 1254 | MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>"); |
| 1255 | MODULE_ALIAS_CRYPTO("gcm_base"); |
| 1256 | MODULE_ALIAS_CRYPTO("rfc4106"); |
| 1257 | MODULE_ALIAS_CRYPTO("rfc4543"); |
| 1258 | MODULE_ALIAS_CRYPTO("gcm"); |