| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * CCM: Counter with CBC-MAC |
| 4 | * |
| 5 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> |
| 6 | */ |
| 7 | |
| 8 | #include <crypto/internal/aead.h> |
| 9 | #include <crypto/internal/cipher.h> |
| 10 | #include <crypto/internal/hash.h> |
| 11 | #include <crypto/internal/skcipher.h> |
| 12 | #include <crypto/scatterwalk.h> |
| 13 | #include <crypto/utils.h> |
| 14 | #include <linux/err.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/string.h> |
| 19 | |
| 20 | struct ccm_instance_ctx { |
| 21 | struct crypto_skcipher_spawn ctr; |
| 22 | struct crypto_ahash_spawn mac; |
| 23 | }; |
| 24 | |
| 25 | struct crypto_ccm_ctx { |
| 26 | struct crypto_ahash *mac; |
| 27 | struct crypto_skcipher *ctr; |
| 28 | }; |
| 29 | |
| 30 | struct crypto_rfc4309_ctx { |
| 31 | struct crypto_aead *child; |
| 32 | u8 nonce[3]; |
| 33 | }; |
| 34 | |
| 35 | struct crypto_rfc4309_req_ctx { |
| 36 | struct scatterlist src[3]; |
| 37 | struct scatterlist dst[3]; |
| 38 | struct aead_request subreq; |
| 39 | }; |
| 40 | |
| 41 | struct crypto_ccm_req_priv_ctx { |
| 42 | u8 odata[16]; |
| 43 | u8 idata[16]; |
| 44 | u8 auth_tag[16]; |
| 45 | u32 flags; |
| 46 | struct scatterlist src[3]; |
| 47 | struct scatterlist dst[3]; |
| 48 | union { |
| 49 | struct ahash_request ahreq; |
| 50 | struct skcipher_request skreq; |
| 51 | }; |
| 52 | }; |
| 53 | |
| 54 | struct cbcmac_tfm_ctx { |
| 55 | struct crypto_cipher *child; |
| 56 | }; |
| 57 | |
| 58 | static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( |
| 59 | struct aead_request *req) |
| 60 | { |
| 61 | unsigned long align = crypto_aead_alignmask(tfm: crypto_aead_reqtfm(req)); |
| 62 | |
| 63 | return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); |
| 64 | } |
| 65 | |
| 66 | static int set_msg_len(u8 *block, unsigned int msglen, int csize) |
| 67 | { |
| 68 | __be32 data; |
| 69 | |
| 70 | memset(s: block, c: 0, n: csize); |
| 71 | block += csize; |
| 72 | |
| 73 | if (csize >= 4) |
| 74 | csize = 4; |
| 75 | else if (msglen > (1 << (8 * csize))) |
| 76 | return -EOVERFLOW; |
| 77 | |
| 78 | data = cpu_to_be32(msglen); |
| 79 | memcpy(to: block - csize, from: (u8 *)&data + 4 - csize, len: csize); |
| 80 | |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, |
| 85 | unsigned int keylen) |
| 86 | { |
| 87 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm: aead); |
| 88 | struct crypto_skcipher *ctr = ctx->ctr; |
| 89 | struct crypto_ahash *mac = ctx->mac; |
| 90 | int err; |
| 91 | |
| 92 | crypto_skcipher_clear_flags(tfm: ctr, CRYPTO_TFM_REQ_MASK); |
| 93 | crypto_skcipher_set_flags(tfm: ctr, flags: crypto_aead_get_flags(tfm: aead) & |
| 94 | CRYPTO_TFM_REQ_MASK); |
| 95 | err = crypto_skcipher_setkey(tfm: ctr, key, keylen); |
| 96 | if (err) |
| 97 | return err; |
| 98 | |
| 99 | crypto_ahash_clear_flags(tfm: mac, CRYPTO_TFM_REQ_MASK); |
| 100 | crypto_ahash_set_flags(tfm: mac, flags: crypto_aead_get_flags(tfm: aead) & |
| 101 | CRYPTO_TFM_REQ_MASK); |
| 102 | return crypto_ahash_setkey(tfm: mac, key, keylen); |
| 103 | } |
| 104 | |
| 105 | static int crypto_ccm_setauthsize(struct crypto_aead *tfm, |
| 106 | unsigned int authsize) |
| 107 | { |
| 108 | switch (authsize) { |
| 109 | case 4: |
| 110 | case 6: |
| 111 | case 8: |
| 112 | case 10: |
| 113 | case 12: |
| 114 | case 14: |
| 115 | case 16: |
| 116 | break; |
| 117 | default: |
| 118 | return -EINVAL; |
| 119 | } |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static int format_input(u8 *info, struct aead_request *req, |
| 125 | unsigned int cryptlen) |
| 126 | { |
| 127 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 128 | unsigned int lp = req->iv[0]; |
| 129 | unsigned int l = lp + 1; |
| 130 | unsigned int m; |
| 131 | |
| 132 | m = crypto_aead_authsize(tfm: aead); |
| 133 | |
| 134 | memcpy(to: info, from: req->iv, len: 16); |
| 135 | |
| 136 | /* format control info per RFC 3610 and |
| 137 | * NIST Special Publication 800-38C |
| 138 | */ |
| 139 | *info |= (8 * ((m - 2) / 2)); |
| 140 | if (req->assoclen) |
| 141 | *info |= 64; |
| 142 | |
| 143 | return set_msg_len(block: info + 16 - l, msglen: cryptlen, csize: l); |
| 144 | } |
| 145 | |
| 146 | static int format_adata(u8 *adata, unsigned int a) |
| 147 | { |
| 148 | int len = 0; |
| 149 | |
| 150 | /* add control info for associated data |
| 151 | * RFC 3610 and NIST Special Publication 800-38C |
| 152 | */ |
| 153 | if (a < 65280) { |
| 154 | *(__be16 *)adata = cpu_to_be16(a); |
| 155 | len = 2; |
| 156 | } else { |
| 157 | *(__be16 *)adata = cpu_to_be16(0xfffe); |
| 158 | *(__be32 *)&adata[2] = cpu_to_be32(a); |
| 159 | len = 6; |
| 160 | } |
| 161 | |
| 162 | return len; |
| 163 | } |
| 164 | |
| 165 | static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, |
| 166 | unsigned int cryptlen) |
| 167 | { |
| 168 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 169 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 170 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm: aead); |
| 171 | struct ahash_request *ahreq = &pctx->ahreq; |
| 172 | unsigned int assoclen = req->assoclen; |
| 173 | struct scatterlist sg[3]; |
| 174 | u8 *odata = pctx->odata; |
| 175 | u8 *idata = pctx->idata; |
| 176 | int ilen, err; |
| 177 | |
| 178 | /* format control data for input */ |
| 179 | err = format_input(info: odata, req, cryptlen); |
| 180 | if (err) |
| 181 | goto out; |
| 182 | |
| 183 | sg_init_table(sg, 3); |
| 184 | sg_set_buf(sg: &sg[0], buf: odata, buflen: 16); |
| 185 | |
| 186 | /* format associated data and compute into mac */ |
| 187 | if (assoclen) { |
| 188 | ilen = format_adata(adata: idata, a: assoclen); |
| 189 | sg_set_buf(sg: &sg[1], buf: idata, buflen: ilen); |
| 190 | sg_chain(prv: sg, prv_nents: 3, sgl: req->src); |
| 191 | } else { |
| 192 | ilen = 0; |
| 193 | sg_chain(prv: sg, prv_nents: 2, sgl: req->src); |
| 194 | } |
| 195 | |
| 196 | ahash_request_set_tfm(req: ahreq, tfm: ctx->mac); |
| 197 | ahash_request_set_callback(req: ahreq, flags: pctx->flags, NULL, NULL); |
| 198 | ahash_request_set_crypt(req: ahreq, src: sg, NULL, nbytes: assoclen + ilen + 16); |
| 199 | err = crypto_ahash_init(req: ahreq); |
| 200 | if (err) |
| 201 | goto out; |
| 202 | err = crypto_ahash_update(req: ahreq); |
| 203 | if (err) |
| 204 | goto out; |
| 205 | |
| 206 | /* we need to pad the MAC input to a round multiple of the block size */ |
| 207 | ilen = 16 - (assoclen + ilen) % 16; |
| 208 | if (ilen < 16) { |
| 209 | memset(s: idata, c: 0, n: ilen); |
| 210 | sg_init_table(sg, 2); |
| 211 | sg_set_buf(sg: &sg[0], buf: idata, buflen: ilen); |
| 212 | if (plain) |
| 213 | sg_chain(prv: sg, prv_nents: 2, sgl: plain); |
| 214 | plain = sg; |
| 215 | cryptlen += ilen; |
| 216 | } |
| 217 | |
| 218 | ahash_request_set_crypt(req: ahreq, src: plain, result: odata, nbytes: cryptlen); |
| 219 | err = crypto_ahash_finup(req: ahreq); |
| 220 | out: |
| 221 | return err; |
| 222 | } |
| 223 | |
| 224 | static void crypto_ccm_encrypt_done(void *data, int err) |
| 225 | { |
| 226 | struct aead_request *req = data; |
| 227 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 228 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 229 | u8 *odata = pctx->odata; |
| 230 | |
| 231 | if (!err) |
| 232 | scatterwalk_map_and_copy(buf: odata, sg: req->dst, |
| 233 | start: req->assoclen + req->cryptlen, |
| 234 | nbytes: crypto_aead_authsize(tfm: aead), out: 1); |
| 235 | aead_request_complete(req, err); |
| 236 | } |
| 237 | |
| 238 | static inline int crypto_ccm_check_iv(const u8 *iv) |
| 239 | { |
| 240 | /* 2 <= L <= 8, so 1 <= L' <= 7. */ |
| 241 | if (1 > iv[0] || iv[0] > 7) |
| 242 | return -EINVAL; |
| 243 | |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) |
| 248 | { |
| 249 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 250 | struct scatterlist *sg; |
| 251 | u8 *iv = req->iv; |
| 252 | int err; |
| 253 | |
| 254 | err = crypto_ccm_check_iv(iv); |
| 255 | if (err) |
| 256 | return err; |
| 257 | |
| 258 | pctx->flags = aead_request_flags(req); |
| 259 | |
| 260 | /* Note: rfc 3610 and NIST 800-38C require counter of |
| 261 | * zero to encrypt auth tag. |
| 262 | */ |
| 263 | memset(s: iv + 15 - iv[0], c: 0, n: iv[0] + 1); |
| 264 | |
| 265 | sg_init_table(pctx->src, 3); |
| 266 | sg_set_buf(sg: pctx->src, buf: tag, buflen: 16); |
| 267 | sg = scatterwalk_ffwd(dst: pctx->src + 1, src: req->src, len: req->assoclen); |
| 268 | if (sg != pctx->src + 1) |
| 269 | sg_chain(prv: pctx->src, prv_nents: 2, sgl: sg); |
| 270 | |
| 271 | if (req->src != req->dst) { |
| 272 | sg_init_table(pctx->dst, 3); |
| 273 | sg_set_buf(sg: pctx->dst, buf: tag, buflen: 16); |
| 274 | sg = scatterwalk_ffwd(dst: pctx->dst + 1, src: req->dst, len: req->assoclen); |
| 275 | if (sg != pctx->dst + 1) |
| 276 | sg_chain(prv: pctx->dst, prv_nents: 2, sgl: sg); |
| 277 | } |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | static int crypto_ccm_encrypt(struct aead_request *req) |
| 283 | { |
| 284 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 285 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm: aead); |
| 286 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 287 | struct skcipher_request *skreq = &pctx->skreq; |
| 288 | struct scatterlist *dst; |
| 289 | unsigned int cryptlen = req->cryptlen; |
| 290 | u8 *odata = pctx->odata; |
| 291 | u8 *iv = req->iv; |
| 292 | int err; |
| 293 | |
| 294 | err = crypto_ccm_init_crypt(req, tag: odata); |
| 295 | if (err) |
| 296 | return err; |
| 297 | |
| 298 | err = crypto_ccm_auth(req, plain: sg_next(sg: pctx->src), cryptlen); |
| 299 | if (err) |
| 300 | return err; |
| 301 | |
| 302 | dst = pctx->src; |
| 303 | if (req->src != req->dst) |
| 304 | dst = pctx->dst; |
| 305 | |
| 306 | skcipher_request_set_tfm(req: skreq, tfm: ctx->ctr); |
| 307 | skcipher_request_set_callback(req: skreq, flags: pctx->flags, |
| 308 | compl: crypto_ccm_encrypt_done, data: req); |
| 309 | skcipher_request_set_crypt(req: skreq, src: pctx->src, dst, cryptlen: cryptlen + 16, iv); |
| 310 | err = crypto_skcipher_encrypt(req: skreq); |
| 311 | if (err) |
| 312 | return err; |
| 313 | |
| 314 | /* copy authtag to end of dst */ |
| 315 | scatterwalk_map_and_copy(buf: odata, sg: sg_next(sg: dst), start: cryptlen, |
| 316 | nbytes: crypto_aead_authsize(tfm: aead), out: 1); |
| 317 | return err; |
| 318 | } |
| 319 | |
| 320 | static void crypto_ccm_decrypt_done(void *data, int err) |
| 321 | { |
| 322 | struct aead_request *req = data; |
| 323 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 324 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 325 | unsigned int authsize = crypto_aead_authsize(tfm: aead); |
| 326 | unsigned int cryptlen = req->cryptlen - authsize; |
| 327 | struct scatterlist *dst; |
| 328 | |
| 329 | pctx->flags = 0; |
| 330 | |
| 331 | dst = sg_next(sg: req->src == req->dst ? pctx->src : pctx->dst); |
| 332 | |
| 333 | if (!err) { |
| 334 | err = crypto_ccm_auth(req, plain: dst, cryptlen); |
| 335 | if (!err && crypto_memneq(a: pctx->auth_tag, b: pctx->odata, size: authsize)) |
| 336 | err = -EBADMSG; |
| 337 | } |
| 338 | aead_request_complete(req, err); |
| 339 | } |
| 340 | |
| 341 | static int crypto_ccm_decrypt(struct aead_request *req) |
| 342 | { |
| 343 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 344 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm: aead); |
| 345 | struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); |
| 346 | struct skcipher_request *skreq = &pctx->skreq; |
| 347 | struct scatterlist *dst; |
| 348 | unsigned int authsize = crypto_aead_authsize(tfm: aead); |
| 349 | unsigned int cryptlen = req->cryptlen; |
| 350 | u8 *authtag = pctx->auth_tag; |
| 351 | u8 *odata = pctx->odata; |
| 352 | u8 *iv = pctx->idata; |
| 353 | int err; |
| 354 | |
| 355 | cryptlen -= authsize; |
| 356 | |
| 357 | err = crypto_ccm_init_crypt(req, tag: authtag); |
| 358 | if (err) |
| 359 | return err; |
| 360 | |
| 361 | scatterwalk_map_and_copy(buf: authtag, sg: sg_next(sg: pctx->src), start: cryptlen, |
| 362 | nbytes: authsize, out: 0); |
| 363 | |
| 364 | dst = pctx->src; |
| 365 | if (req->src != req->dst) |
| 366 | dst = pctx->dst; |
| 367 | |
| 368 | memcpy(to: iv, from: req->iv, len: 16); |
| 369 | |
| 370 | skcipher_request_set_tfm(req: skreq, tfm: ctx->ctr); |
| 371 | skcipher_request_set_callback(req: skreq, flags: pctx->flags, |
| 372 | compl: crypto_ccm_decrypt_done, data: req); |
| 373 | skcipher_request_set_crypt(req: skreq, src: pctx->src, dst, cryptlen: cryptlen + 16, iv); |
| 374 | err = crypto_skcipher_decrypt(req: skreq); |
| 375 | if (err) |
| 376 | return err; |
| 377 | |
| 378 | err = crypto_ccm_auth(req, plain: sg_next(sg: dst), cryptlen); |
| 379 | if (err) |
| 380 | return err; |
| 381 | |
| 382 | /* verify */ |
| 383 | if (crypto_memneq(a: authtag, b: odata, size: authsize)) |
| 384 | return -EBADMSG; |
| 385 | |
| 386 | return err; |
| 387 | } |
| 388 | |
| 389 | static int crypto_ccm_init_tfm(struct crypto_aead *tfm) |
| 390 | { |
| 391 | struct aead_instance *inst = aead_alg_instance(aead: tfm); |
| 392 | struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); |
| 393 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); |
| 394 | struct crypto_ahash *mac; |
| 395 | struct crypto_skcipher *ctr; |
| 396 | unsigned long align; |
| 397 | int err; |
| 398 | |
| 399 | mac = crypto_spawn_ahash(spawn: &ictx->mac); |
| 400 | if (IS_ERR(ptr: mac)) |
| 401 | return PTR_ERR(ptr: mac); |
| 402 | |
| 403 | ctr = crypto_spawn_skcipher(spawn: &ictx->ctr); |
| 404 | err = PTR_ERR(ptr: ctr); |
| 405 | if (IS_ERR(ptr: ctr)) |
| 406 | goto err_free_mac; |
| 407 | |
| 408 | ctx->mac = mac; |
| 409 | ctx->ctr = ctr; |
| 410 | |
| 411 | align = crypto_aead_alignmask(tfm); |
| 412 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 413 | crypto_aead_set_reqsize( |
| 414 | aead: tfm, |
| 415 | reqsize: align + sizeof(struct crypto_ccm_req_priv_ctx) + |
| 416 | max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); |
| 417 | |
| 418 | return 0; |
| 419 | |
| 420 | err_free_mac: |
| 421 | crypto_free_ahash(tfm: mac); |
| 422 | return err; |
| 423 | } |
| 424 | |
| 425 | static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) |
| 426 | { |
| 427 | struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); |
| 428 | |
| 429 | crypto_free_ahash(tfm: ctx->mac); |
| 430 | crypto_free_skcipher(tfm: ctx->ctr); |
| 431 | } |
| 432 | |
| 433 | static void crypto_ccm_free(struct aead_instance *inst) |
| 434 | { |
| 435 | struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); |
| 436 | |
| 437 | crypto_drop_ahash(spawn: &ctx->mac); |
| 438 | crypto_drop_skcipher(spawn: &ctx->ctr); |
| 439 | kfree(objp: inst); |
| 440 | } |
| 441 | |
| 442 | static int crypto_ccm_create_common(struct crypto_template *tmpl, |
| 443 | struct rtattr **tb, |
| 444 | const char *ctr_name, |
| 445 | const char *mac_name) |
| 446 | { |
| 447 | struct skcipher_alg_common *ctr; |
| 448 | u32 mask; |
| 449 | struct aead_instance *inst; |
| 450 | struct ccm_instance_ctx *ictx; |
| 451 | struct hash_alg_common *mac; |
| 452 | int err; |
| 453 | |
| 454 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, mask_ret: &mask); |
| 455 | if (err) |
| 456 | return err; |
| 457 | |
| 458 | inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); |
| 459 | if (!inst) |
| 460 | return -ENOMEM; |
| 461 | ictx = aead_instance_ctx(inst); |
| 462 | |
| 463 | err = crypto_grab_ahash(spawn: &ictx->mac, inst: aead_crypto_instance(inst), |
| 464 | name: mac_name, type: 0, mask: mask | CRYPTO_ALG_ASYNC); |
| 465 | if (err) |
| 466 | goto err_free_inst; |
| 467 | mac = crypto_spawn_ahash_alg(spawn: &ictx->mac); |
| 468 | |
| 469 | err = -EINVAL; |
| 470 | if (strncmp(mac->base.cra_name, "cbcmac(" , 7) != 0 || |
| 471 | mac->digestsize != 16) |
| 472 | goto err_free_inst; |
| 473 | |
| 474 | err = crypto_grab_skcipher(spawn: &ictx->ctr, inst: aead_crypto_instance(inst), |
| 475 | name: ctr_name, type: 0, mask); |
| 476 | if (err) |
| 477 | goto err_free_inst; |
| 478 | ctr = crypto_spawn_skcipher_alg_common(spawn: &ictx->ctr); |
| 479 | |
| 480 | /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ |
| 481 | err = -EINVAL; |
| 482 | if (strncmp(ctr->base.cra_name, "ctr(" , 4) != 0 || |
| 483 | ctr->ivsize != 16 || ctr->base.cra_blocksize != 1) |
| 484 | goto err_free_inst; |
| 485 | |
| 486 | /* ctr and cbcmac must use the same underlying block cipher. */ |
| 487 | if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) |
| 488 | goto err_free_inst; |
| 489 | |
| 490 | err = -ENAMETOOLONG; |
| 491 | if (snprintf(buf: inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 492 | fmt: "ccm(%s" , ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) |
| 493 | goto err_free_inst; |
| 494 | |
| 495 | if (snprintf(buf: inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 496 | fmt: "ccm_base(%s,%s)" , ctr->base.cra_driver_name, |
| 497 | mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
| 498 | goto err_free_inst; |
| 499 | |
| 500 | inst->alg.base.cra_priority = (mac->base.cra_priority + |
| 501 | ctr->base.cra_priority) / 2; |
| 502 | inst->alg.base.cra_blocksize = 1; |
| 503 | inst->alg.base.cra_alignmask = ctr->base.cra_alignmask; |
| 504 | inst->alg.ivsize = 16; |
| 505 | inst->alg.chunksize = ctr->chunksize; |
| 506 | inst->alg.maxauthsize = 16; |
| 507 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); |
| 508 | inst->alg.init = crypto_ccm_init_tfm; |
| 509 | inst->alg.exit = crypto_ccm_exit_tfm; |
| 510 | inst->alg.setkey = crypto_ccm_setkey; |
| 511 | inst->alg.setauthsize = crypto_ccm_setauthsize; |
| 512 | inst->alg.encrypt = crypto_ccm_encrypt; |
| 513 | inst->alg.decrypt = crypto_ccm_decrypt; |
| 514 | |
| 515 | inst->free = crypto_ccm_free; |
| 516 | |
| 517 | err = aead_register_instance(tmpl, inst); |
| 518 | if (err) { |
| 519 | err_free_inst: |
| 520 | crypto_ccm_free(inst); |
| 521 | } |
| 522 | return err; |
| 523 | } |
| 524 | |
| 525 | static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) |
| 526 | { |
| 527 | const char *cipher_name; |
| 528 | char ctr_name[CRYPTO_MAX_ALG_NAME]; |
| 529 | char mac_name[CRYPTO_MAX_ALG_NAME]; |
| 530 | |
| 531 | cipher_name = crypto_attr_alg_name(rta: tb[1]); |
| 532 | if (IS_ERR(ptr: cipher_name)) |
| 533 | return PTR_ERR(ptr: cipher_name); |
| 534 | |
| 535 | if (snprintf(buf: ctr_name, CRYPTO_MAX_ALG_NAME, fmt: "ctr(%s)" , |
| 536 | cipher_name) >= CRYPTO_MAX_ALG_NAME) |
| 537 | return -ENAMETOOLONG; |
| 538 | |
| 539 | if (snprintf(buf: mac_name, CRYPTO_MAX_ALG_NAME, fmt: "cbcmac(%s)" , |
| 540 | cipher_name) >= CRYPTO_MAX_ALG_NAME) |
| 541 | return -ENAMETOOLONG; |
| 542 | |
| 543 | return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
| 544 | } |
| 545 | |
| 546 | static int crypto_ccm_base_create(struct crypto_template *tmpl, |
| 547 | struct rtattr **tb) |
| 548 | { |
| 549 | const char *ctr_name; |
| 550 | const char *mac_name; |
| 551 | |
| 552 | ctr_name = crypto_attr_alg_name(rta: tb[1]); |
| 553 | if (IS_ERR(ptr: ctr_name)) |
| 554 | return PTR_ERR(ptr: ctr_name); |
| 555 | |
| 556 | mac_name = crypto_attr_alg_name(rta: tb[2]); |
| 557 | if (IS_ERR(ptr: mac_name)) |
| 558 | return PTR_ERR(ptr: mac_name); |
| 559 | |
| 560 | return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); |
| 561 | } |
| 562 | |
| 563 | static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, |
| 564 | unsigned int keylen) |
| 565 | { |
| 566 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm: parent); |
| 567 | struct crypto_aead *child = ctx->child; |
| 568 | |
| 569 | if (keylen < 3) |
| 570 | return -EINVAL; |
| 571 | |
| 572 | keylen -= 3; |
| 573 | memcpy(to: ctx->nonce, from: key + keylen, len: 3); |
| 574 | |
| 575 | crypto_aead_clear_flags(tfm: child, CRYPTO_TFM_REQ_MASK); |
| 576 | crypto_aead_set_flags(tfm: child, flags: crypto_aead_get_flags(tfm: parent) & |
| 577 | CRYPTO_TFM_REQ_MASK); |
| 578 | return crypto_aead_setkey(tfm: child, key, keylen); |
| 579 | } |
| 580 | |
| 581 | static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, |
| 582 | unsigned int authsize) |
| 583 | { |
| 584 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm: parent); |
| 585 | |
| 586 | switch (authsize) { |
| 587 | case 8: |
| 588 | case 12: |
| 589 | case 16: |
| 590 | break; |
| 591 | default: |
| 592 | return -EINVAL; |
| 593 | } |
| 594 | |
| 595 | return crypto_aead_setauthsize(tfm: ctx->child, authsize); |
| 596 | } |
| 597 | |
| 598 | static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) |
| 599 | { |
| 600 | struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); |
| 601 | struct aead_request *subreq = &rctx->subreq; |
| 602 | struct crypto_aead *aead = crypto_aead_reqtfm(req); |
| 603 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm: aead); |
| 604 | struct crypto_aead *child = ctx->child; |
| 605 | struct scatterlist *sg; |
| 606 | u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), |
| 607 | crypto_aead_alignmask(child) + 1); |
| 608 | |
| 609 | /* L' */ |
| 610 | iv[0] = 3; |
| 611 | |
| 612 | memcpy(to: iv + 1, from: ctx->nonce, len: 3); |
| 613 | memcpy(to: iv + 4, from: req->iv, len: 8); |
| 614 | |
| 615 | scatterwalk_map_and_copy(buf: iv + 16, sg: req->src, start: 0, nbytes: req->assoclen - 8, out: 0); |
| 616 | |
| 617 | sg_init_table(rctx->src, 3); |
| 618 | sg_set_buf(sg: rctx->src, buf: iv + 16, buflen: req->assoclen - 8); |
| 619 | sg = scatterwalk_ffwd(dst: rctx->src + 1, src: req->src, len: req->assoclen); |
| 620 | if (sg != rctx->src + 1) |
| 621 | sg_chain(prv: rctx->src, prv_nents: 2, sgl: sg); |
| 622 | |
| 623 | if (req->src != req->dst) { |
| 624 | sg_init_table(rctx->dst, 3); |
| 625 | sg_set_buf(sg: rctx->dst, buf: iv + 16, buflen: req->assoclen - 8); |
| 626 | sg = scatterwalk_ffwd(dst: rctx->dst + 1, src: req->dst, len: req->assoclen); |
| 627 | if (sg != rctx->dst + 1) |
| 628 | sg_chain(prv: rctx->dst, prv_nents: 2, sgl: sg); |
| 629 | } |
| 630 | |
| 631 | aead_request_set_tfm(req: subreq, tfm: child); |
| 632 | aead_request_set_callback(req: subreq, flags: req->base.flags, compl: req->base.complete, |
| 633 | data: req->base.data); |
| 634 | aead_request_set_crypt(req: subreq, src: rctx->src, |
| 635 | dst: req->src == req->dst ? rctx->src : rctx->dst, |
| 636 | cryptlen: req->cryptlen, iv); |
| 637 | aead_request_set_ad(req: subreq, assoclen: req->assoclen - 8); |
| 638 | |
| 639 | return subreq; |
| 640 | } |
| 641 | |
| 642 | static int crypto_rfc4309_encrypt(struct aead_request *req) |
| 643 | { |
| 644 | if (req->assoclen != 16 && req->assoclen != 20) |
| 645 | return -EINVAL; |
| 646 | |
| 647 | req = crypto_rfc4309_crypt(req); |
| 648 | |
| 649 | return crypto_aead_encrypt(req); |
| 650 | } |
| 651 | |
| 652 | static int crypto_rfc4309_decrypt(struct aead_request *req) |
| 653 | { |
| 654 | if (req->assoclen != 16 && req->assoclen != 20) |
| 655 | return -EINVAL; |
| 656 | |
| 657 | req = crypto_rfc4309_crypt(req); |
| 658 | |
| 659 | return crypto_aead_decrypt(req); |
| 660 | } |
| 661 | |
| 662 | static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) |
| 663 | { |
| 664 | struct aead_instance *inst = aead_alg_instance(aead: tfm); |
| 665 | struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); |
| 666 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
| 667 | struct crypto_aead *aead; |
| 668 | unsigned long align; |
| 669 | |
| 670 | aead = crypto_spawn_aead(spawn); |
| 671 | if (IS_ERR(ptr: aead)) |
| 672 | return PTR_ERR(ptr: aead); |
| 673 | |
| 674 | ctx->child = aead; |
| 675 | |
| 676 | align = crypto_aead_alignmask(tfm: aead); |
| 677 | align &= ~(crypto_tfm_ctx_alignment() - 1); |
| 678 | crypto_aead_set_reqsize( |
| 679 | aead: tfm, |
| 680 | reqsize: sizeof(struct crypto_rfc4309_req_ctx) + |
| 681 | ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + |
| 682 | align + 32); |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) |
| 688 | { |
| 689 | struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); |
| 690 | |
| 691 | crypto_free_aead(tfm: ctx->child); |
| 692 | } |
| 693 | |
| 694 | static void crypto_rfc4309_free(struct aead_instance *inst) |
| 695 | { |
| 696 | crypto_drop_aead(spawn: aead_instance_ctx(inst)); |
| 697 | kfree(objp: inst); |
| 698 | } |
| 699 | |
| 700 | static int crypto_rfc4309_create(struct crypto_template *tmpl, |
| 701 | struct rtattr **tb) |
| 702 | { |
| 703 | u32 mask; |
| 704 | struct aead_instance *inst; |
| 705 | struct crypto_aead_spawn *spawn; |
| 706 | struct aead_alg *alg; |
| 707 | int err; |
| 708 | |
| 709 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, mask_ret: &mask); |
| 710 | if (err) |
| 711 | return err; |
| 712 | |
| 713 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| 714 | if (!inst) |
| 715 | return -ENOMEM; |
| 716 | |
| 717 | spawn = aead_instance_ctx(inst); |
| 718 | err = crypto_grab_aead(spawn, inst: aead_crypto_instance(inst), |
| 719 | name: crypto_attr_alg_name(rta: tb[1]), type: 0, mask); |
| 720 | if (err) |
| 721 | goto err_free_inst; |
| 722 | |
| 723 | alg = crypto_spawn_aead_alg(spawn); |
| 724 | |
| 725 | err = -EINVAL; |
| 726 | |
| 727 | /* We only support 16-byte blocks. */ |
| 728 | if (crypto_aead_alg_ivsize(alg) != 16) |
| 729 | goto err_free_inst; |
| 730 | |
| 731 | /* Not a stream cipher? */ |
| 732 | if (alg->base.cra_blocksize != 1) |
| 733 | goto err_free_inst; |
| 734 | |
| 735 | err = -ENAMETOOLONG; |
| 736 | if (snprintf(buf: inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
| 737 | fmt: "rfc4309(%s)" , alg->base.cra_name) >= |
| 738 | CRYPTO_MAX_ALG_NAME || |
| 739 | snprintf(buf: inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
| 740 | fmt: "rfc4309(%s)" , alg->base.cra_driver_name) >= |
| 741 | CRYPTO_MAX_ALG_NAME) |
| 742 | goto err_free_inst; |
| 743 | |
| 744 | inst->alg.base.cra_priority = alg->base.cra_priority; |
| 745 | inst->alg.base.cra_blocksize = 1; |
| 746 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; |
| 747 | |
| 748 | inst->alg.ivsize = 8; |
| 749 | inst->alg.chunksize = crypto_aead_alg_chunksize(alg); |
| 750 | inst->alg.maxauthsize = 16; |
| 751 | |
| 752 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); |
| 753 | |
| 754 | inst->alg.init = crypto_rfc4309_init_tfm; |
| 755 | inst->alg.exit = crypto_rfc4309_exit_tfm; |
| 756 | |
| 757 | inst->alg.setkey = crypto_rfc4309_setkey; |
| 758 | inst->alg.setauthsize = crypto_rfc4309_setauthsize; |
| 759 | inst->alg.encrypt = crypto_rfc4309_encrypt; |
| 760 | inst->alg.decrypt = crypto_rfc4309_decrypt; |
| 761 | |
| 762 | inst->free = crypto_rfc4309_free; |
| 763 | |
| 764 | err = aead_register_instance(tmpl, inst); |
| 765 | if (err) { |
| 766 | err_free_inst: |
| 767 | crypto_rfc4309_free(inst); |
| 768 | } |
| 769 | return err; |
| 770 | } |
| 771 | |
| 772 | static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, |
| 773 | const u8 *inkey, unsigned int keylen) |
| 774 | { |
| 775 | struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(tfm: parent); |
| 776 | |
| 777 | return crypto_cipher_setkey(tfm: ctx->child, key: inkey, keylen); |
| 778 | } |
| 779 | |
| 780 | static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) |
| 781 | { |
| 782 | int bs = crypto_shash_digestsize(tfm: pdesc->tfm); |
| 783 | u8 *dg = shash_desc_ctx(desc: pdesc); |
| 784 | |
| 785 | memset(s: dg, c: 0, n: bs); |
| 786 | return 0; |
| 787 | } |
| 788 | |
| 789 | static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, |
| 790 | unsigned int len) |
| 791 | { |
| 792 | struct crypto_shash *parent = pdesc->tfm; |
| 793 | struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(tfm: parent); |
| 794 | struct crypto_cipher *tfm = tctx->child; |
| 795 | int bs = crypto_shash_digestsize(tfm: parent); |
| 796 | u8 *dg = shash_desc_ctx(desc: pdesc); |
| 797 | |
| 798 | do { |
| 799 | crypto_xor(dst: dg, src: p, size: bs); |
| 800 | crypto_cipher_encrypt_one(tfm, dst: dg, src: dg); |
| 801 | p += bs; |
| 802 | len -= bs; |
| 803 | } while (len >= bs); |
| 804 | return len; |
| 805 | } |
| 806 | |
| 807 | static int crypto_cbcmac_digest_finup(struct shash_desc *pdesc, const u8 *src, |
| 808 | unsigned int len, u8 *out) |
| 809 | { |
| 810 | struct crypto_shash *parent = pdesc->tfm; |
| 811 | struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(tfm: parent); |
| 812 | struct crypto_cipher *tfm = tctx->child; |
| 813 | int bs = crypto_shash_digestsize(tfm: parent); |
| 814 | u8 *dg = shash_desc_ctx(desc: pdesc); |
| 815 | |
| 816 | if (len) { |
| 817 | crypto_xor(dst: dg, src, size: len); |
| 818 | crypto_cipher_encrypt_one(tfm, dst: out, src: dg); |
| 819 | return 0; |
| 820 | } |
| 821 | memcpy(to: out, from: dg, len: bs); |
| 822 | return 0; |
| 823 | } |
| 824 | |
| 825 | static int cbcmac_init_tfm(struct crypto_tfm *tfm) |
| 826 | { |
| 827 | struct crypto_cipher *cipher; |
| 828 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
| 829 | struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst); |
| 830 | struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
| 831 | |
| 832 | cipher = crypto_spawn_cipher(spawn); |
| 833 | if (IS_ERR(ptr: cipher)) |
| 834 | return PTR_ERR(ptr: cipher); |
| 835 | |
| 836 | ctx->child = cipher; |
| 837 | |
| 838 | return 0; |
| 839 | }; |
| 840 | |
| 841 | static void cbcmac_exit_tfm(struct crypto_tfm *tfm) |
| 842 | { |
| 843 | struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
| 844 | crypto_free_cipher(tfm: ctx->child); |
| 845 | } |
| 846 | |
| 847 | static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) |
| 848 | { |
| 849 | struct shash_instance *inst; |
| 850 | struct crypto_cipher_spawn *spawn; |
| 851 | struct crypto_alg *alg; |
| 852 | u32 mask; |
| 853 | int err; |
| 854 | |
| 855 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, mask_ret: &mask); |
| 856 | if (err) |
| 857 | return err; |
| 858 | |
| 859 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
| 860 | if (!inst) |
| 861 | return -ENOMEM; |
| 862 | spawn = shash_instance_ctx(inst); |
| 863 | |
| 864 | err = crypto_grab_cipher(spawn, inst: shash_crypto_instance(inst), |
| 865 | name: crypto_attr_alg_name(rta: tb[1]), type: 0, mask); |
| 866 | if (err) |
| 867 | goto err_free_inst; |
| 868 | alg = crypto_spawn_cipher_alg(spawn); |
| 869 | |
| 870 | err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); |
| 871 | if (err) |
| 872 | goto err_free_inst; |
| 873 | |
| 874 | inst->alg.base.cra_priority = alg->cra_priority; |
| 875 | inst->alg.base.cra_blocksize = alg->cra_blocksize; |
| 876 | |
| 877 | inst->alg.digestsize = alg->cra_blocksize; |
| 878 | inst->alg.descsize = alg->cra_blocksize; |
| 879 | |
| 880 | inst->alg.base.cra_flags = CRYPTO_AHASH_ALG_BLOCK_ONLY; |
| 881 | inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); |
| 882 | inst->alg.base.cra_init = cbcmac_init_tfm; |
| 883 | inst->alg.base.cra_exit = cbcmac_exit_tfm; |
| 884 | |
| 885 | inst->alg.init = crypto_cbcmac_digest_init; |
| 886 | inst->alg.update = crypto_cbcmac_digest_update; |
| 887 | inst->alg.finup = crypto_cbcmac_digest_finup; |
| 888 | inst->alg.setkey = crypto_cbcmac_digest_setkey; |
| 889 | |
| 890 | inst->free = shash_free_singlespawn_instance; |
| 891 | |
| 892 | err = shash_register_instance(tmpl, inst); |
| 893 | if (err) { |
| 894 | err_free_inst: |
| 895 | shash_free_singlespawn_instance(inst); |
| 896 | } |
| 897 | return err; |
| 898 | } |
| 899 | |
| 900 | static struct crypto_template crypto_ccm_tmpls[] = { |
| 901 | { |
| 902 | .name = "cbcmac" , |
| 903 | .create = cbcmac_create, |
| 904 | .module = THIS_MODULE, |
| 905 | }, { |
| 906 | .name = "ccm_base" , |
| 907 | .create = crypto_ccm_base_create, |
| 908 | .module = THIS_MODULE, |
| 909 | }, { |
| 910 | .name = "ccm" , |
| 911 | .create = crypto_ccm_create, |
| 912 | .module = THIS_MODULE, |
| 913 | }, { |
| 914 | .name = "rfc4309" , |
| 915 | .create = crypto_rfc4309_create, |
| 916 | .module = THIS_MODULE, |
| 917 | }, |
| 918 | }; |
| 919 | |
| 920 | static int __init crypto_ccm_module_init(void) |
| 921 | { |
| 922 | return crypto_register_templates(tmpls: crypto_ccm_tmpls, |
| 923 | ARRAY_SIZE(crypto_ccm_tmpls)); |
| 924 | } |
| 925 | |
| 926 | static void __exit crypto_ccm_module_exit(void) |
| 927 | { |
| 928 | crypto_unregister_templates(tmpls: crypto_ccm_tmpls, |
| 929 | ARRAY_SIZE(crypto_ccm_tmpls)); |
| 930 | } |
| 931 | |
| 932 | module_init(crypto_ccm_module_init); |
| 933 | module_exit(crypto_ccm_module_exit); |
| 934 | |
| 935 | MODULE_LICENSE("GPL" ); |
| 936 | MODULE_DESCRIPTION("Counter with CBC MAC" ); |
| 937 | MODULE_ALIAS_CRYPTO("ccm_base" ); |
| 938 | MODULE_ALIAS_CRYPTO("rfc4309" ); |
| 939 | MODULE_ALIAS_CRYPTO("ccm" ); |
| 940 | MODULE_ALIAS_CRYPTO("cbcmac" ); |
| 941 | MODULE_IMPORT_NS("CRYPTO_INTERNAL" ); |
| 942 | |