1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES 4 * 5 * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> 6 */ 7 8 #include <asm/neon.h> 9 #include <asm/hwcap.h> 10 #include <asm/simd.h> 11 #include <crypto/aes.h> 12 #include <crypto/ctr.h> 13 #include <crypto/sha2.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/internal/simd.h> 16 #include <crypto/internal/skcipher.h> 17 #include <crypto/scatterwalk.h> 18 #include <linux/module.h> 19 #include <linux/cpufeature.h> 20 #include <crypto/xts.h> 21 22 #include "aes-ce-setkey.h" 23 24 #ifdef USE_V8_CRYPTO_EXTENSIONS 25 #define MODE "ce" 26 #define PRIO 300 27 #define aes_expandkey ce_aes_expandkey 28 #define aes_ecb_encrypt ce_aes_ecb_encrypt 29 #define aes_ecb_decrypt ce_aes_ecb_decrypt 30 #define aes_cbc_encrypt ce_aes_cbc_encrypt 31 #define aes_cbc_decrypt ce_aes_cbc_decrypt 32 #define aes_cbc_cts_encrypt ce_aes_cbc_cts_encrypt 33 #define aes_cbc_cts_decrypt ce_aes_cbc_cts_decrypt 34 #define aes_essiv_cbc_encrypt ce_aes_essiv_cbc_encrypt 35 #define aes_essiv_cbc_decrypt ce_aes_essiv_cbc_decrypt 36 #define aes_ctr_encrypt ce_aes_ctr_encrypt 37 #define aes_xts_encrypt ce_aes_xts_encrypt 38 #define aes_xts_decrypt ce_aes_xts_decrypt 39 #define aes_mac_update ce_aes_mac_update 40 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions"); 41 #else 42 #define MODE "neon" 43 #define PRIO 200 44 #define aes_ecb_encrypt neon_aes_ecb_encrypt 45 #define aes_ecb_decrypt neon_aes_ecb_decrypt 46 #define aes_cbc_encrypt neon_aes_cbc_encrypt 47 #define aes_cbc_decrypt neon_aes_cbc_decrypt 48 #define aes_cbc_cts_encrypt neon_aes_cbc_cts_encrypt 49 #define aes_cbc_cts_decrypt neon_aes_cbc_cts_decrypt 50 #define aes_essiv_cbc_encrypt neon_aes_essiv_cbc_encrypt 51 #define aes_essiv_cbc_decrypt neon_aes_essiv_cbc_decrypt 52 #define aes_ctr_encrypt neon_aes_ctr_encrypt 53 #define aes_xts_encrypt neon_aes_xts_encrypt 54 #define aes_xts_decrypt neon_aes_xts_decrypt 55 #define aes_mac_update neon_aes_mac_update 56 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON"); 57 #endif 58 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !defined(CONFIG_CRYPTO_AES_ARM64_BS) 59 MODULE_ALIAS_CRYPTO("ecb(aes)"); 60 MODULE_ALIAS_CRYPTO("cbc(aes)"); 61 MODULE_ALIAS_CRYPTO("ctr(aes)"); 62 MODULE_ALIAS_CRYPTO("xts(aes)"); 63 #endif 64 MODULE_ALIAS_CRYPTO("cts(cbc(aes))"); 65 MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)"); 66 MODULE_ALIAS_CRYPTO("cmac(aes)"); 67 MODULE_ALIAS_CRYPTO("xcbc(aes)"); 68 MODULE_ALIAS_CRYPTO("cbcmac(aes)"); 69 70 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 71 MODULE_LICENSE("GPL v2"); 72 73 /* defined in aes-modes.S */ 74 asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[], 75 int rounds, int blocks); 76 asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u32 const rk[], 77 int rounds, int blocks); 78 79 asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[], 80 int rounds, int blocks, u8 iv[]); 81 asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u32 const rk[], 82 int rounds, int blocks, u8 iv[]); 83 84 asmlinkage void aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[], 85 int rounds, int bytes, u8 const iv[]); 86 asmlinkage void aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[], 87 int rounds, int bytes, u8 const iv[]); 88 89 asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u32 const rk[], 90 int rounds, int blocks, u8 ctr[]); 91 92 asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u32 const rk1[], 93 int rounds, int bytes, u32 const rk2[], u8 iv[], 94 int first); 95 asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u32 const rk1[], 96 int rounds, int bytes, u32 const rk2[], u8 iv[], 97 int first); 98 99 asmlinkage void aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[], 100 int rounds, int blocks, u8 iv[], 101 u32 const rk2[]); 102 asmlinkage void aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[], 103 int rounds, int blocks, u8 iv[], 104 u32 const rk2[]); 105 106 asmlinkage void aes_mac_update(u8 const in[], u32 const rk[], int rounds, 107 int blocks, u8 dg[], int enc_before, 108 int enc_after); 109 110 struct crypto_aes_xts_ctx { 111 struct crypto_aes_ctx key1; 112 struct crypto_aes_ctx __aligned(8) key2; 113 }; 114 115 struct crypto_aes_essiv_cbc_ctx { 116 struct crypto_aes_ctx key1; 117 struct crypto_aes_ctx __aligned(8) key2; 118 struct crypto_shash *hash; 119 }; 120 121 struct mac_tfm_ctx { 122 struct crypto_aes_ctx key; 123 u8 __aligned(8) consts[]; 124 }; 125 126 struct mac_desc_ctx { 127 unsigned int len; 128 u8 dg[AES_BLOCK_SIZE]; 129 }; 130 131 static int skcipher_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key, 132 unsigned int key_len) 133 { 134 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 135 136 return aes_expandkey(ctx, in_key, key_len); 137 } 138 139 static int __maybe_unused xts_set_key(struct crypto_skcipher *tfm, 140 const u8 *in_key, unsigned int key_len) 141 { 142 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 143 int ret; 144 145 ret = xts_verify_key(tfm, in_key, key_len); 146 if (ret) 147 return ret; 148 149 ret = aes_expandkey(&ctx->key1, in_key, key_len / 2); 150 if (!ret) 151 ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2], 152 key_len / 2); 153 return ret; 154 } 155 156 static int __maybe_unused essiv_cbc_set_key(struct crypto_skcipher *tfm, 157 const u8 *in_key, 158 unsigned int key_len) 159 { 160 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 161 u8 digest[SHA256_DIGEST_SIZE]; 162 int ret; 163 164 ret = aes_expandkey(&ctx->key1, in_key, key_len); 165 if (ret) 166 return ret; 167 168 crypto_shash_tfm_digest(ctx->hash, in_key, key_len, digest); 169 170 return aes_expandkey(&ctx->key2, digest, sizeof(digest)); 171 } 172 173 static int __maybe_unused ecb_encrypt(struct skcipher_request *req) 174 { 175 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 176 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 177 int err, rounds = 6 + ctx->key_length / 4; 178 struct skcipher_walk walk; 179 unsigned int blocks; 180 181 err = skcipher_walk_virt(&walk, req, false); 182 183 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 184 kernel_neon_begin(); 185 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 186 ctx->key_enc, rounds, blocks); 187 kernel_neon_end(); 188 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 189 } 190 return err; 191 } 192 193 static int __maybe_unused ecb_decrypt(struct skcipher_request *req) 194 { 195 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 196 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 197 int err, rounds = 6 + ctx->key_length / 4; 198 struct skcipher_walk walk; 199 unsigned int blocks; 200 201 err = skcipher_walk_virt(&walk, req, false); 202 203 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 204 kernel_neon_begin(); 205 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 206 ctx->key_dec, rounds, blocks); 207 kernel_neon_end(); 208 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 209 } 210 return err; 211 } 212 213 static int cbc_encrypt_walk(struct skcipher_request *req, 214 struct skcipher_walk *walk) 215 { 216 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 217 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 218 int err = 0, rounds = 6 + ctx->key_length / 4; 219 unsigned int blocks; 220 221 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 222 kernel_neon_begin(); 223 aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr, 224 ctx->key_enc, rounds, blocks, walk->iv); 225 kernel_neon_end(); 226 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 227 } 228 return err; 229 } 230 231 static int __maybe_unused cbc_encrypt(struct skcipher_request *req) 232 { 233 struct skcipher_walk walk; 234 int err; 235 236 err = skcipher_walk_virt(&walk, req, false); 237 if (err) 238 return err; 239 return cbc_encrypt_walk(req, &walk); 240 } 241 242 static int cbc_decrypt_walk(struct skcipher_request *req, 243 struct skcipher_walk *walk) 244 { 245 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 246 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 247 int err = 0, rounds = 6 + ctx->key_length / 4; 248 unsigned int blocks; 249 250 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 251 kernel_neon_begin(); 252 aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr, 253 ctx->key_dec, rounds, blocks, walk->iv); 254 kernel_neon_end(); 255 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 256 } 257 return err; 258 } 259 260 static int __maybe_unused cbc_decrypt(struct skcipher_request *req) 261 { 262 struct skcipher_walk walk; 263 int err; 264 265 err = skcipher_walk_virt(&walk, req, false); 266 if (err) 267 return err; 268 return cbc_decrypt_walk(req, &walk); 269 } 270 271 static int cts_cbc_encrypt(struct skcipher_request *req) 272 { 273 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 274 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 275 int err, rounds = 6 + ctx->key_length / 4; 276 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 277 struct scatterlist *src = req->src, *dst = req->dst; 278 struct scatterlist sg_src[2], sg_dst[2]; 279 struct skcipher_request subreq; 280 struct skcipher_walk walk; 281 282 skcipher_request_set_tfm(&subreq, tfm); 283 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 284 NULL, NULL); 285 286 if (req->cryptlen <= AES_BLOCK_SIZE) { 287 if (req->cryptlen < AES_BLOCK_SIZE) 288 return -EINVAL; 289 cbc_blocks = 1; 290 } 291 292 if (cbc_blocks > 0) { 293 skcipher_request_set_crypt(&subreq, req->src, req->dst, 294 cbc_blocks * AES_BLOCK_SIZE, 295 req->iv); 296 297 err = skcipher_walk_virt(&walk, &subreq, false) ?: 298 cbc_encrypt_walk(&subreq, &walk); 299 if (err) 300 return err; 301 302 if (req->cryptlen == AES_BLOCK_SIZE) 303 return 0; 304 305 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 306 if (req->dst != req->src) 307 dst = scatterwalk_ffwd(sg_dst, req->dst, 308 subreq.cryptlen); 309 } 310 311 /* handle ciphertext stealing */ 312 skcipher_request_set_crypt(&subreq, src, dst, 313 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 314 req->iv); 315 316 err = skcipher_walk_virt(&walk, &subreq, false); 317 if (err) 318 return err; 319 320 kernel_neon_begin(); 321 aes_cbc_cts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 322 ctx->key_enc, rounds, walk.nbytes, walk.iv); 323 kernel_neon_end(); 324 325 return skcipher_walk_done(&walk, 0); 326 } 327 328 static int cts_cbc_decrypt(struct skcipher_request *req) 329 { 330 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 331 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 332 int err, rounds = 6 + ctx->key_length / 4; 333 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 334 struct scatterlist *src = req->src, *dst = req->dst; 335 struct scatterlist sg_src[2], sg_dst[2]; 336 struct skcipher_request subreq; 337 struct skcipher_walk walk; 338 339 skcipher_request_set_tfm(&subreq, tfm); 340 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 341 NULL, NULL); 342 343 if (req->cryptlen <= AES_BLOCK_SIZE) { 344 if (req->cryptlen < AES_BLOCK_SIZE) 345 return -EINVAL; 346 cbc_blocks = 1; 347 } 348 349 if (cbc_blocks > 0) { 350 skcipher_request_set_crypt(&subreq, req->src, req->dst, 351 cbc_blocks * AES_BLOCK_SIZE, 352 req->iv); 353 354 err = skcipher_walk_virt(&walk, &subreq, false) ?: 355 cbc_decrypt_walk(&subreq, &walk); 356 if (err) 357 return err; 358 359 if (req->cryptlen == AES_BLOCK_SIZE) 360 return 0; 361 362 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 363 if (req->dst != req->src) 364 dst = scatterwalk_ffwd(sg_dst, req->dst, 365 subreq.cryptlen); 366 } 367 368 /* handle ciphertext stealing */ 369 skcipher_request_set_crypt(&subreq, src, dst, 370 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 371 req->iv); 372 373 err = skcipher_walk_virt(&walk, &subreq, false); 374 if (err) 375 return err; 376 377 kernel_neon_begin(); 378 aes_cbc_cts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 379 ctx->key_dec, rounds, walk.nbytes, walk.iv); 380 kernel_neon_end(); 381 382 return skcipher_walk_done(&walk, 0); 383 } 384 385 static int __maybe_unused essiv_cbc_init_tfm(struct crypto_skcipher *tfm) 386 { 387 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 388 389 ctx->hash = crypto_alloc_shash("sha256", 0, 0); 390 391 return PTR_ERR_OR_ZERO(ctx->hash); 392 } 393 394 static void __maybe_unused essiv_cbc_exit_tfm(struct crypto_skcipher *tfm) 395 { 396 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 397 398 crypto_free_shash(ctx->hash); 399 } 400 401 static int __maybe_unused essiv_cbc_encrypt(struct skcipher_request *req) 402 { 403 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 404 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 405 int err, rounds = 6 + ctx->key1.key_length / 4; 406 struct skcipher_walk walk; 407 unsigned int blocks; 408 409 err = skcipher_walk_virt(&walk, req, false); 410 411 blocks = walk.nbytes / AES_BLOCK_SIZE; 412 if (blocks) { 413 kernel_neon_begin(); 414 aes_essiv_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 415 ctx->key1.key_enc, rounds, blocks, 416 req->iv, ctx->key2.key_enc); 417 kernel_neon_end(); 418 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 419 } 420 return err ?: cbc_encrypt_walk(req, &walk); 421 } 422 423 static int __maybe_unused essiv_cbc_decrypt(struct skcipher_request *req) 424 { 425 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 426 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 427 int err, rounds = 6 + ctx->key1.key_length / 4; 428 struct skcipher_walk walk; 429 unsigned int blocks; 430 431 err = skcipher_walk_virt(&walk, req, false); 432 433 blocks = walk.nbytes / AES_BLOCK_SIZE; 434 if (blocks) { 435 kernel_neon_begin(); 436 aes_essiv_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 437 ctx->key1.key_dec, rounds, blocks, 438 req->iv, ctx->key2.key_enc); 439 kernel_neon_end(); 440 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 441 } 442 return err ?: cbc_decrypt_walk(req, &walk); 443 } 444 445 static int ctr_encrypt(struct skcipher_request *req) 446 { 447 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 448 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 449 int err, rounds = 6 + ctx->key_length / 4; 450 struct skcipher_walk walk; 451 int blocks; 452 453 err = skcipher_walk_virt(&walk, req, false); 454 455 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 456 kernel_neon_begin(); 457 aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 458 ctx->key_enc, rounds, blocks, walk.iv); 459 kernel_neon_end(); 460 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 461 } 462 if (walk.nbytes) { 463 u8 __aligned(8) tail[AES_BLOCK_SIZE]; 464 unsigned int nbytes = walk.nbytes; 465 u8 *tdst = walk.dst.virt.addr; 466 u8 *tsrc = walk.src.virt.addr; 467 468 /* 469 * Tell aes_ctr_encrypt() to process a tail block. 470 */ 471 blocks = -1; 472 473 kernel_neon_begin(); 474 aes_ctr_encrypt(tail, NULL, ctx->key_enc, rounds, 475 blocks, walk.iv); 476 kernel_neon_end(); 477 crypto_xor_cpy(tdst, tsrc, tail, nbytes); 478 err = skcipher_walk_done(&walk, 0); 479 } 480 481 return err; 482 } 483 484 static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) 485 { 486 const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 487 unsigned long flags; 488 489 /* 490 * Temporarily disable interrupts to avoid races where 491 * cachelines are evicted when the CPU is interrupted 492 * to do something else. 493 */ 494 local_irq_save(flags); 495 aes_encrypt(ctx, dst, src); 496 local_irq_restore(flags); 497 } 498 499 static int __maybe_unused ctr_encrypt_sync(struct skcipher_request *req) 500 { 501 if (!crypto_simd_usable()) 502 return crypto_ctr_encrypt_walk(req, ctr_encrypt_one); 503 504 return ctr_encrypt(req); 505 } 506 507 static int __maybe_unused xts_encrypt(struct skcipher_request *req) 508 { 509 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 510 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 511 int err, first, rounds = 6 + ctx->key1.key_length / 4; 512 int tail = req->cryptlen % AES_BLOCK_SIZE; 513 struct scatterlist sg_src[2], sg_dst[2]; 514 struct skcipher_request subreq; 515 struct scatterlist *src, *dst; 516 struct skcipher_walk walk; 517 518 if (req->cryptlen < AES_BLOCK_SIZE) 519 return -EINVAL; 520 521 err = skcipher_walk_virt(&walk, req, false); 522 523 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 524 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 525 AES_BLOCK_SIZE) - 2; 526 527 skcipher_walk_abort(&walk); 528 529 skcipher_request_set_tfm(&subreq, tfm); 530 skcipher_request_set_callback(&subreq, 531 skcipher_request_flags(req), 532 NULL, NULL); 533 skcipher_request_set_crypt(&subreq, req->src, req->dst, 534 xts_blocks * AES_BLOCK_SIZE, 535 req->iv); 536 req = &subreq; 537 err = skcipher_walk_virt(&walk, req, false); 538 } else { 539 tail = 0; 540 } 541 542 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 543 int nbytes = walk.nbytes; 544 545 if (walk.nbytes < walk.total) 546 nbytes &= ~(AES_BLOCK_SIZE - 1); 547 548 kernel_neon_begin(); 549 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 550 ctx->key1.key_enc, rounds, nbytes, 551 ctx->key2.key_enc, walk.iv, first); 552 kernel_neon_end(); 553 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 554 } 555 556 if (err || likely(!tail)) 557 return err; 558 559 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 560 if (req->dst != req->src) 561 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 562 563 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 564 req->iv); 565 566 err = skcipher_walk_virt(&walk, &subreq, false); 567 if (err) 568 return err; 569 570 kernel_neon_begin(); 571 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 572 ctx->key1.key_enc, rounds, walk.nbytes, 573 ctx->key2.key_enc, walk.iv, first); 574 kernel_neon_end(); 575 576 return skcipher_walk_done(&walk, 0); 577 } 578 579 static int __maybe_unused xts_decrypt(struct skcipher_request *req) 580 { 581 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 582 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 583 int err, first, rounds = 6 + ctx->key1.key_length / 4; 584 int tail = req->cryptlen % AES_BLOCK_SIZE; 585 struct scatterlist sg_src[2], sg_dst[2]; 586 struct skcipher_request subreq; 587 struct scatterlist *src, *dst; 588 struct skcipher_walk walk; 589 590 if (req->cryptlen < AES_BLOCK_SIZE) 591 return -EINVAL; 592 593 err = skcipher_walk_virt(&walk, req, false); 594 595 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 596 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 597 AES_BLOCK_SIZE) - 2; 598 599 skcipher_walk_abort(&walk); 600 601 skcipher_request_set_tfm(&subreq, tfm); 602 skcipher_request_set_callback(&subreq, 603 skcipher_request_flags(req), 604 NULL, NULL); 605 skcipher_request_set_crypt(&subreq, req->src, req->dst, 606 xts_blocks * AES_BLOCK_SIZE, 607 req->iv); 608 req = &subreq; 609 err = skcipher_walk_virt(&walk, req, false); 610 } else { 611 tail = 0; 612 } 613 614 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 615 int nbytes = walk.nbytes; 616 617 if (walk.nbytes < walk.total) 618 nbytes &= ~(AES_BLOCK_SIZE - 1); 619 620 kernel_neon_begin(); 621 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 622 ctx->key1.key_dec, rounds, nbytes, 623 ctx->key2.key_enc, walk.iv, first); 624 kernel_neon_end(); 625 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 626 } 627 628 if (err || likely(!tail)) 629 return err; 630 631 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 632 if (req->dst != req->src) 633 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 634 635 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 636 req->iv); 637 638 err = skcipher_walk_virt(&walk, &subreq, false); 639 if (err) 640 return err; 641 642 643 kernel_neon_begin(); 644 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 645 ctx->key1.key_dec, rounds, walk.nbytes, 646 ctx->key2.key_enc, walk.iv, first); 647 kernel_neon_end(); 648 649 return skcipher_walk_done(&walk, 0); 650 } 651 652 static struct skcipher_alg aes_algs[] = { { 653 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !defined(CONFIG_CRYPTO_AES_ARM64_BS) 654 .base = { 655 .cra_name = "__ecb(aes)", 656 .cra_driver_name = "__ecb-aes-" MODE, 657 .cra_priority = PRIO, 658 .cra_flags = CRYPTO_ALG_INTERNAL, 659 .cra_blocksize = AES_BLOCK_SIZE, 660 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 661 .cra_module = THIS_MODULE, 662 }, 663 .min_keysize = AES_MIN_KEY_SIZE, 664 .max_keysize = AES_MAX_KEY_SIZE, 665 .setkey = skcipher_aes_setkey, 666 .encrypt = ecb_encrypt, 667 .decrypt = ecb_decrypt, 668 }, { 669 .base = { 670 .cra_name = "__cbc(aes)", 671 .cra_driver_name = "__cbc-aes-" MODE, 672 .cra_priority = PRIO, 673 .cra_flags = CRYPTO_ALG_INTERNAL, 674 .cra_blocksize = AES_BLOCK_SIZE, 675 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 676 .cra_module = THIS_MODULE, 677 }, 678 .min_keysize = AES_MIN_KEY_SIZE, 679 .max_keysize = AES_MAX_KEY_SIZE, 680 .ivsize = AES_BLOCK_SIZE, 681 .setkey = skcipher_aes_setkey, 682 .encrypt = cbc_encrypt, 683 .decrypt = cbc_decrypt, 684 }, { 685 .base = { 686 .cra_name = "__ctr(aes)", 687 .cra_driver_name = "__ctr-aes-" MODE, 688 .cra_priority = PRIO, 689 .cra_flags = CRYPTO_ALG_INTERNAL, 690 .cra_blocksize = 1, 691 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 692 .cra_module = THIS_MODULE, 693 }, 694 .min_keysize = AES_MIN_KEY_SIZE, 695 .max_keysize = AES_MAX_KEY_SIZE, 696 .ivsize = AES_BLOCK_SIZE, 697 .chunksize = AES_BLOCK_SIZE, 698 .setkey = skcipher_aes_setkey, 699 .encrypt = ctr_encrypt, 700 .decrypt = ctr_encrypt, 701 }, { 702 .base = { 703 .cra_name = "ctr(aes)", 704 .cra_driver_name = "ctr-aes-" MODE, 705 .cra_priority = PRIO - 1, 706 .cra_blocksize = 1, 707 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 708 .cra_module = THIS_MODULE, 709 }, 710 .min_keysize = AES_MIN_KEY_SIZE, 711 .max_keysize = AES_MAX_KEY_SIZE, 712 .ivsize = AES_BLOCK_SIZE, 713 .chunksize = AES_BLOCK_SIZE, 714 .setkey = skcipher_aes_setkey, 715 .encrypt = ctr_encrypt_sync, 716 .decrypt = ctr_encrypt_sync, 717 }, { 718 .base = { 719 .cra_name = "__xts(aes)", 720 .cra_driver_name = "__xts-aes-" MODE, 721 .cra_priority = PRIO, 722 .cra_flags = CRYPTO_ALG_INTERNAL, 723 .cra_blocksize = AES_BLOCK_SIZE, 724 .cra_ctxsize = sizeof(struct crypto_aes_xts_ctx), 725 .cra_module = THIS_MODULE, 726 }, 727 .min_keysize = 2 * AES_MIN_KEY_SIZE, 728 .max_keysize = 2 * AES_MAX_KEY_SIZE, 729 .ivsize = AES_BLOCK_SIZE, 730 .walksize = 2 * AES_BLOCK_SIZE, 731 .setkey = xts_set_key, 732 .encrypt = xts_encrypt, 733 .decrypt = xts_decrypt, 734 }, { 735 #endif 736 .base = { 737 .cra_name = "__cts(cbc(aes))", 738 .cra_driver_name = "__cts-cbc-aes-" MODE, 739 .cra_priority = PRIO, 740 .cra_flags = CRYPTO_ALG_INTERNAL, 741 .cra_blocksize = AES_BLOCK_SIZE, 742 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 743 .cra_module = THIS_MODULE, 744 }, 745 .min_keysize = AES_MIN_KEY_SIZE, 746 .max_keysize = AES_MAX_KEY_SIZE, 747 .ivsize = AES_BLOCK_SIZE, 748 .walksize = 2 * AES_BLOCK_SIZE, 749 .setkey = skcipher_aes_setkey, 750 .encrypt = cts_cbc_encrypt, 751 .decrypt = cts_cbc_decrypt, 752 }, { 753 .base = { 754 .cra_name = "__essiv(cbc(aes),sha256)", 755 .cra_driver_name = "__essiv-cbc-aes-sha256-" MODE, 756 .cra_priority = PRIO + 1, 757 .cra_flags = CRYPTO_ALG_INTERNAL, 758 .cra_blocksize = AES_BLOCK_SIZE, 759 .cra_ctxsize = sizeof(struct crypto_aes_essiv_cbc_ctx), 760 .cra_module = THIS_MODULE, 761 }, 762 .min_keysize = AES_MIN_KEY_SIZE, 763 .max_keysize = AES_MAX_KEY_SIZE, 764 .ivsize = AES_BLOCK_SIZE, 765 .setkey = essiv_cbc_set_key, 766 .encrypt = essiv_cbc_encrypt, 767 .decrypt = essiv_cbc_decrypt, 768 .init = essiv_cbc_init_tfm, 769 .exit = essiv_cbc_exit_tfm, 770 } }; 771 772 static int cbcmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 773 unsigned int key_len) 774 { 775 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 776 777 return aes_expandkey(&ctx->key, in_key, key_len); 778 } 779 780 static void cmac_gf128_mul_by_x(be128 *y, const be128 *x) 781 { 782 u64 a = be64_to_cpu(x->a); 783 u64 b = be64_to_cpu(x->b); 784 785 y->a = cpu_to_be64((a << 1) | (b >> 63)); 786 y->b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0)); 787 } 788 789 static int cmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 790 unsigned int key_len) 791 { 792 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 793 be128 *consts = (be128 *)ctx->consts; 794 int rounds = 6 + key_len / 4; 795 int err; 796 797 err = cbcmac_setkey(tfm, in_key, key_len); 798 if (err) 799 return err; 800 801 /* encrypt the zero vector */ 802 kernel_neon_begin(); 803 aes_ecb_encrypt(ctx->consts, (u8[AES_BLOCK_SIZE]){}, ctx->key.key_enc, 804 rounds, 1); 805 kernel_neon_end(); 806 807 cmac_gf128_mul_by_x(consts, consts); 808 cmac_gf128_mul_by_x(consts + 1, consts); 809 810 return 0; 811 } 812 813 static int xcbc_setkey(struct crypto_shash *tfm, const u8 *in_key, 814 unsigned int key_len) 815 { 816 static u8 const ks[3][AES_BLOCK_SIZE] = { 817 { [0 ... AES_BLOCK_SIZE - 1] = 0x1 }, 818 { [0 ... AES_BLOCK_SIZE - 1] = 0x2 }, 819 { [0 ... AES_BLOCK_SIZE - 1] = 0x3 }, 820 }; 821 822 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 823 int rounds = 6 + key_len / 4; 824 u8 key[AES_BLOCK_SIZE]; 825 int err; 826 827 err = cbcmac_setkey(tfm, in_key, key_len); 828 if (err) 829 return err; 830 831 kernel_neon_begin(); 832 aes_ecb_encrypt(key, ks[0], ctx->key.key_enc, rounds, 1); 833 aes_ecb_encrypt(ctx->consts, ks[1], ctx->key.key_enc, rounds, 2); 834 kernel_neon_end(); 835 836 return cbcmac_setkey(tfm, key, sizeof(key)); 837 } 838 839 static int mac_init(struct shash_desc *desc) 840 { 841 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 842 843 memset(ctx->dg, 0, AES_BLOCK_SIZE); 844 ctx->len = 0; 845 846 return 0; 847 } 848 849 static void mac_do_update(struct crypto_aes_ctx *ctx, u8 const in[], int blocks, 850 u8 dg[], int enc_before, int enc_after) 851 { 852 int rounds = 6 + ctx->key_length / 4; 853 854 if (crypto_simd_usable()) { 855 kernel_neon_begin(); 856 aes_mac_update(in, ctx->key_enc, rounds, blocks, dg, enc_before, 857 enc_after); 858 kernel_neon_end(); 859 } else { 860 if (enc_before) 861 aes_encrypt(ctx, dg, dg); 862 863 while (blocks--) { 864 crypto_xor(dg, in, AES_BLOCK_SIZE); 865 in += AES_BLOCK_SIZE; 866 867 if (blocks || enc_after) 868 aes_encrypt(ctx, dg, dg); 869 } 870 } 871 } 872 873 static int mac_update(struct shash_desc *desc, const u8 *p, unsigned int len) 874 { 875 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 876 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 877 878 while (len > 0) { 879 unsigned int l; 880 881 if ((ctx->len % AES_BLOCK_SIZE) == 0 && 882 (ctx->len + len) > AES_BLOCK_SIZE) { 883 884 int blocks = len / AES_BLOCK_SIZE; 885 886 len %= AES_BLOCK_SIZE; 887 888 mac_do_update(&tctx->key, p, blocks, ctx->dg, 889 (ctx->len != 0), (len != 0)); 890 891 p += blocks * AES_BLOCK_SIZE; 892 893 if (!len) { 894 ctx->len = AES_BLOCK_SIZE; 895 break; 896 } 897 ctx->len = 0; 898 } 899 900 l = min(len, AES_BLOCK_SIZE - ctx->len); 901 902 if (l <= AES_BLOCK_SIZE) { 903 crypto_xor(ctx->dg + ctx->len, p, l); 904 ctx->len += l; 905 len -= l; 906 p += l; 907 } 908 } 909 910 return 0; 911 } 912 913 static int cbcmac_final(struct shash_desc *desc, u8 *out) 914 { 915 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 916 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 917 918 mac_do_update(&tctx->key, NULL, 0, ctx->dg, (ctx->len != 0), 0); 919 920 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 921 922 return 0; 923 } 924 925 static int cmac_final(struct shash_desc *desc, u8 *out) 926 { 927 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 928 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 929 u8 *consts = tctx->consts; 930 931 if (ctx->len != AES_BLOCK_SIZE) { 932 ctx->dg[ctx->len] ^= 0x80; 933 consts += AES_BLOCK_SIZE; 934 } 935 936 mac_do_update(&tctx->key, consts, 1, ctx->dg, 0, 1); 937 938 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 939 940 return 0; 941 } 942 943 static struct shash_alg mac_algs[] = { { 944 .base.cra_name = "cmac(aes)", 945 .base.cra_driver_name = "cmac-aes-" MODE, 946 .base.cra_priority = PRIO, 947 .base.cra_blocksize = AES_BLOCK_SIZE, 948 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 949 2 * AES_BLOCK_SIZE, 950 .base.cra_module = THIS_MODULE, 951 952 .digestsize = AES_BLOCK_SIZE, 953 .init = mac_init, 954 .update = mac_update, 955 .final = cmac_final, 956 .setkey = cmac_setkey, 957 .descsize = sizeof(struct mac_desc_ctx), 958 }, { 959 .base.cra_name = "xcbc(aes)", 960 .base.cra_driver_name = "xcbc-aes-" MODE, 961 .base.cra_priority = PRIO, 962 .base.cra_blocksize = AES_BLOCK_SIZE, 963 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 964 2 * AES_BLOCK_SIZE, 965 .base.cra_module = THIS_MODULE, 966 967 .digestsize = AES_BLOCK_SIZE, 968 .init = mac_init, 969 .update = mac_update, 970 .final = cmac_final, 971 .setkey = xcbc_setkey, 972 .descsize = sizeof(struct mac_desc_ctx), 973 }, { 974 .base.cra_name = "cbcmac(aes)", 975 .base.cra_driver_name = "cbcmac-aes-" MODE, 976 .base.cra_priority = PRIO, 977 .base.cra_blocksize = 1, 978 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx), 979 .base.cra_module = THIS_MODULE, 980 981 .digestsize = AES_BLOCK_SIZE, 982 .init = mac_init, 983 .update = mac_update, 984 .final = cbcmac_final, 985 .setkey = cbcmac_setkey, 986 .descsize = sizeof(struct mac_desc_ctx), 987 } }; 988 989 static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)]; 990 991 static void aes_exit(void) 992 { 993 int i; 994 995 for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++) 996 if (aes_simd_algs[i]) 997 simd_skcipher_free(aes_simd_algs[i]); 998 999 crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1000 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1001 } 1002 1003 static int __init aes_init(void) 1004 { 1005 struct simd_skcipher_alg *simd; 1006 const char *basename; 1007 const char *algname; 1008 const char *drvname; 1009 int err; 1010 int i; 1011 1012 err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1013 if (err) 1014 return err; 1015 1016 err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1017 if (err) 1018 goto unregister_ciphers; 1019 1020 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { 1021 if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL)) 1022 continue; 1023 1024 algname = aes_algs[i].base.cra_name + 2; 1025 drvname = aes_algs[i].base.cra_driver_name + 2; 1026 basename = aes_algs[i].base.cra_driver_name; 1027 simd = simd_skcipher_create_compat(algname, drvname, basename); 1028 err = PTR_ERR(simd); 1029 if (IS_ERR(simd)) 1030 goto unregister_simds; 1031 1032 aes_simd_algs[i] = simd; 1033 } 1034 1035 return 0; 1036 1037 unregister_simds: 1038 aes_exit(); 1039 return err; 1040 unregister_ciphers: 1041 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1042 return err; 1043 } 1044 1045 #ifdef USE_V8_CRYPTO_EXTENSIONS 1046 module_cpu_feature_match(AES, aes_init); 1047 #else 1048 module_init(aes_init); 1049 EXPORT_SYMBOL(neon_aes_ecb_encrypt); 1050 EXPORT_SYMBOL(neon_aes_cbc_encrypt); 1051 EXPORT_SYMBOL(neon_aes_xts_encrypt); 1052 EXPORT_SYMBOL(neon_aes_xts_decrypt); 1053 #endif 1054 module_exit(aes_exit); 1055