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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 | // SPDX-License-Identifier: GPL-2.0-or-later /* * The AEGIS-128L Authenticated-Encryption Algorithm * * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com> * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved. */ #include <crypto/algapi.h> #include <crypto/internal/aead.h> #include <crypto/internal/skcipher.h> #include <crypto/scatterwalk.h> #include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/scatterlist.h> #include "aegis.h" #define AEGIS128L_CHUNK_BLOCKS 2 #define AEGIS128L_CHUNK_SIZE (AEGIS128L_CHUNK_BLOCKS * AEGIS_BLOCK_SIZE) #define AEGIS128L_NONCE_SIZE 16 #define AEGIS128L_STATE_BLOCKS 8 #define AEGIS128L_KEY_SIZE 16 #define AEGIS128L_MIN_AUTH_SIZE 8 #define AEGIS128L_MAX_AUTH_SIZE 16 union aegis_chunk { union aegis_block blocks[AEGIS128L_CHUNK_BLOCKS]; u8 bytes[AEGIS128L_CHUNK_SIZE]; }; struct aegis_state { union aegis_block blocks[AEGIS128L_STATE_BLOCKS]; }; struct aegis_ctx { union aegis_block key; }; struct aegis128l_ops { int (*skcipher_walk_init)(struct skcipher_walk *walk, struct aead_request *req, bool atomic); void (*crypt_chunk)(struct aegis_state *state, u8 *dst, const u8 *src, unsigned int size); }; static void crypto_aegis128l_update(struct aegis_state *state) { union aegis_block tmp; unsigned int i; tmp = state->blocks[AEGIS128L_STATE_BLOCKS - 1]; for (i = AEGIS128L_STATE_BLOCKS - 1; i > 0; i--) crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1], &state->blocks[i]); crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]); } static void crypto_aegis128l_update_a(struct aegis_state *state, const union aegis_chunk *msg) { crypto_aegis128l_update(state); crypto_aegis_block_xor(&state->blocks[0], &msg->blocks[0]); crypto_aegis_block_xor(&state->blocks[4], &msg->blocks[1]); } static void crypto_aegis128l_update_u(struct aegis_state *state, const void *msg) { crypto_aegis128l_update(state); crypto_xor(state->blocks[0].bytes, msg + 0 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); crypto_xor(state->blocks[4].bytes, msg + 1 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); } static void crypto_aegis128l_init(struct aegis_state *state, const union aegis_block *key, const u8 *iv) { union aegis_block key_iv; union aegis_chunk chunk; unsigned int i; memcpy(chunk.blocks[0].bytes, iv, AEGIS_BLOCK_SIZE); chunk.blocks[1] = *key; key_iv = *key; crypto_aegis_block_xor(&key_iv, &chunk.blocks[0]); state->blocks[0] = key_iv; state->blocks[1] = crypto_aegis_const[1]; state->blocks[2] = crypto_aegis_const[0]; state->blocks[3] = crypto_aegis_const[1]; state->blocks[4] = key_iv; state->blocks[5] = *key; state->blocks[6] = *key; state->blocks[7] = *key; crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[0]); crypto_aegis_block_xor(&state->blocks[6], &crypto_aegis_const[1]); crypto_aegis_block_xor(&state->blocks[7], &crypto_aegis_const[0]); for (i = 0; i < 10; i++) { crypto_aegis128l_update_a(state, &chunk); } } static void crypto_aegis128l_ad(struct aegis_state *state, const u8 *src, unsigned int size) { if (AEGIS_ALIGNED(src)) { const union aegis_chunk *src_chunk = (const union aegis_chunk *)src; while (size >= AEGIS128L_CHUNK_SIZE) { crypto_aegis128l_update_a(state, src_chunk); size -= AEGIS128L_CHUNK_SIZE; src_chunk += 1; } } else { while (size >= AEGIS128L_CHUNK_SIZE) { crypto_aegis128l_update_u(state, src); size -= AEGIS128L_CHUNK_SIZE; src += AEGIS128L_CHUNK_SIZE; } } } static void crypto_aegis128l_encrypt_chunk(struct aegis_state *state, u8 *dst, const u8 *src, unsigned int size) { union aegis_chunk tmp; union aegis_block *tmp0 = &tmp.blocks[0]; union aegis_block *tmp1 = &tmp.blocks[1]; if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) { while (size >= AEGIS128L_CHUNK_SIZE) { union aegis_chunk *dst_blk = (union aegis_chunk *)dst; const union aegis_chunk *src_blk = (const union aegis_chunk *)src; *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]); crypto_aegis128l_update_a(state, src_blk); *dst_blk = tmp; size -= AEGIS128L_CHUNK_SIZE; src += AEGIS128L_CHUNK_SIZE; dst += AEGIS128L_CHUNK_SIZE; } } else { while (size >= AEGIS128L_CHUNK_SIZE) { *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); crypto_aegis128l_update_u(state, src); memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE); size -= AEGIS128L_CHUNK_SIZE; src += AEGIS128L_CHUNK_SIZE; dst += AEGIS128L_CHUNK_SIZE; } } if (size > 0) { union aegis_chunk msg = {}; memcpy(msg.bytes, src, size); *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_aegis128l_update_a(state, &msg); crypto_aegis_block_xor(&msg.blocks[0], tmp0); crypto_aegis_block_xor(&msg.blocks[1], tmp1); memcpy(dst, msg.bytes, size); } } static void crypto_aegis128l_decrypt_chunk(struct aegis_state *state, u8 *dst, const u8 *src, unsigned int size) { union aegis_chunk tmp; union aegis_block *tmp0 = &tmp.blocks[0]; union aegis_block *tmp1 = &tmp.blocks[1]; if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) { while (size >= AEGIS128L_CHUNK_SIZE) { union aegis_chunk *dst_blk = (union aegis_chunk *)dst; const union aegis_chunk *src_blk = (const union aegis_chunk *)src; *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]); crypto_aegis128l_update_a(state, &tmp); *dst_blk = tmp; size -= AEGIS128L_CHUNK_SIZE; src += AEGIS128L_CHUNK_SIZE; dst += AEGIS128L_CHUNK_SIZE; } } else { while (size >= AEGIS128L_CHUNK_SIZE) { *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE, AEGIS_BLOCK_SIZE); crypto_aegis128l_update_a(state, &tmp); memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE); size -= AEGIS128L_CHUNK_SIZE; src += AEGIS128L_CHUNK_SIZE; dst += AEGIS128L_CHUNK_SIZE; } } if (size > 0) { union aegis_chunk msg = {}; memcpy(msg.bytes, src, size); *tmp0 = state->blocks[2]; crypto_aegis_block_and(tmp0, &state->blocks[3]); crypto_aegis_block_xor(tmp0, &state->blocks[6]); crypto_aegis_block_xor(tmp0, &state->blocks[1]); crypto_aegis_block_xor(&msg.blocks[0], tmp0); *tmp1 = state->blocks[6]; crypto_aegis_block_and(tmp1, &state->blocks[7]); crypto_aegis_block_xor(tmp1, &state->blocks[5]); crypto_aegis_block_xor(tmp1, &state->blocks[2]); crypto_aegis_block_xor(&msg.blocks[1], tmp1); memset(msg.bytes + size, 0, AEGIS128L_CHUNK_SIZE - size); crypto_aegis128l_update_a(state, &msg); memcpy(dst, msg.bytes, size); } } static void crypto_aegis128l_process_ad(struct aegis_state *state, struct scatterlist *sg_src, unsigned int assoclen) { struct scatter_walk walk; union aegis_chunk buf; unsigned int pos = 0; scatterwalk_start(&walk, sg_src); while (assoclen != 0) { unsigned int size = scatterwalk_clamp(&walk, assoclen); unsigned int left = size; void *mapped = scatterwalk_map(&walk); const u8 *src = (const u8 *)mapped; if (pos + size >= AEGIS128L_CHUNK_SIZE) { if (pos > 0) { unsigned int fill = AEGIS128L_CHUNK_SIZE - pos; memcpy(buf.bytes + pos, src, fill); crypto_aegis128l_update_a(state, &buf); pos = 0; left -= fill; src += fill; } crypto_aegis128l_ad(state, src, left); src += left & ~(AEGIS128L_CHUNK_SIZE - 1); left &= AEGIS128L_CHUNK_SIZE - 1; } memcpy(buf.bytes + pos, src, left); pos += left; assoclen -= size; scatterwalk_unmap(mapped); scatterwalk_advance(&walk, size); scatterwalk_done(&walk, 0, assoclen); } if (pos > 0) { memset(buf.bytes + pos, 0, AEGIS128L_CHUNK_SIZE - pos); crypto_aegis128l_update_a(state, &buf); } } static void crypto_aegis128l_process_crypt(struct aegis_state *state, struct aead_request *req, const struct aegis128l_ops *ops) { struct skcipher_walk walk; ops->skcipher_walk_init(&walk, req, false); while (walk.nbytes) { unsigned int nbytes = walk.nbytes; if (nbytes < walk.total) nbytes = round_down(nbytes, walk.stride); ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr, nbytes); skcipher_walk_done(&walk, walk.nbytes - nbytes); } } static void crypto_aegis128l_final(struct aegis_state *state, union aegis_block *tag_xor, u64 assoclen, u64 cryptlen) { u64 assocbits = assoclen * 8; u64 cryptbits = cryptlen * 8; union aegis_chunk tmp; unsigned int i; tmp.blocks[0].words64[0] = cpu_to_le64(assocbits); tmp.blocks[0].words64[1] = cpu_to_le64(cryptbits); crypto_aegis_block_xor(&tmp.blocks[0], &state->blocks[2]); tmp.blocks[1] = tmp.blocks[0]; for (i = 0; i < 7; i++) crypto_aegis128l_update_a(state, &tmp); for (i = 0; i < 7; i++) crypto_aegis_block_xor(tag_xor, &state->blocks[i]); } static int crypto_aegis128l_setkey(struct crypto_aead *aead, const u8 *key, unsigned int keylen) { struct aegis_ctx *ctx = crypto_aead_ctx(aead); if (keylen != AEGIS128L_KEY_SIZE) { crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN); return -EINVAL; } memcpy(ctx->key.bytes, key, AEGIS128L_KEY_SIZE); return 0; } static int crypto_aegis128l_setauthsize(struct crypto_aead *tfm, unsigned int authsize) { if (authsize > AEGIS128L_MAX_AUTH_SIZE) return -EINVAL; if (authsize < AEGIS128L_MIN_AUTH_SIZE) return -EINVAL; return 0; } static void crypto_aegis128l_crypt(struct aead_request *req, union aegis_block *tag_xor, unsigned int cryptlen, const struct aegis128l_ops *ops) { struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct aegis_ctx *ctx = crypto_aead_ctx(tfm); struct aegis_state state; crypto_aegis128l_init(&state, &ctx->key, req->iv); crypto_aegis128l_process_ad(&state, req->src, req->assoclen); crypto_aegis128l_process_crypt(&state, req, ops); crypto_aegis128l_final(&state, tag_xor, req->assoclen, cryptlen); } static int crypto_aegis128l_encrypt(struct aead_request *req) { static const struct aegis128l_ops ops = { .skcipher_walk_init = skcipher_walk_aead_encrypt, .crypt_chunk = crypto_aegis128l_encrypt_chunk, }; struct crypto_aead *tfm = crypto_aead_reqtfm(req); union aegis_block tag = {}; unsigned int authsize = crypto_aead_authsize(tfm); unsigned int cryptlen = req->cryptlen; crypto_aegis128l_crypt(req, &tag, cryptlen, &ops); scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen, authsize, 1); return 0; } static int crypto_aegis128l_decrypt(struct aead_request *req) { static const struct aegis128l_ops ops = { .skcipher_walk_init = skcipher_walk_aead_decrypt, .crypt_chunk = crypto_aegis128l_decrypt_chunk, }; static const u8 zeros[AEGIS128L_MAX_AUTH_SIZE] = {}; struct crypto_aead *tfm = crypto_aead_reqtfm(req); union aegis_block tag; unsigned int authsize = crypto_aead_authsize(tfm); unsigned int cryptlen = req->cryptlen - authsize; scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen, authsize, 0); crypto_aegis128l_crypt(req, &tag, cryptlen, &ops); return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0; } static int crypto_aegis128l_init_tfm(struct crypto_aead *tfm) { return 0; } static void crypto_aegis128l_exit_tfm(struct crypto_aead *tfm) { } static struct aead_alg crypto_aegis128l_alg = { .setkey = crypto_aegis128l_setkey, .setauthsize = crypto_aegis128l_setauthsize, .encrypt = crypto_aegis128l_encrypt, .decrypt = crypto_aegis128l_decrypt, .init = crypto_aegis128l_init_tfm, .exit = crypto_aegis128l_exit_tfm, .ivsize = AEGIS128L_NONCE_SIZE, .maxauthsize = AEGIS128L_MAX_AUTH_SIZE, .chunksize = AEGIS128L_CHUNK_SIZE, .base = { .cra_blocksize = 1, .cra_ctxsize = sizeof(struct aegis_ctx), .cra_alignmask = 0, .cra_priority = 100, .cra_name = "aegis128l", .cra_driver_name = "aegis128l-generic", .cra_module = THIS_MODULE, } }; static int __init crypto_aegis128l_module_init(void) { return crypto_register_aead(&crypto_aegis128l_alg); } static void __exit crypto_aegis128l_module_exit(void) { crypto_unregister_aead(&crypto_aegis128l_alg); } subsys_initcall(crypto_aegis128l_module_init); module_exit(crypto_aegis128l_module_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>"); MODULE_DESCRIPTION("AEGIS-128L AEAD algorithm"); MODULE_ALIAS_CRYPTO("aegis128l"); MODULE_ALIAS_CRYPTO("aegis128l-generic"); |