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/sha.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 SHASH_DESC_ON_STACK(desc, ctx->hash); 162 u8 digest[SHA256_DIGEST_SIZE]; 163 int ret; 164 165 ret = aes_expandkey(&ctx->key1, in_key, key_len); 166 if (ret) 167 return ret; 168 169 desc->tfm = ctx->hash; 170 crypto_shash_digest(desc, in_key, key_len, digest); 171 172 return aes_expandkey(&ctx->key2, digest, sizeof(digest)); 173 } 174 175 static int __maybe_unused ecb_encrypt(struct skcipher_request *req) 176 { 177 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 178 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 179 int err, rounds = 6 + ctx->key_length / 4; 180 struct skcipher_walk walk; 181 unsigned int blocks; 182 183 err = skcipher_walk_virt(&walk, req, false); 184 185 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 186 kernel_neon_begin(); 187 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 188 ctx->key_enc, rounds, blocks); 189 kernel_neon_end(); 190 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 191 } 192 return err; 193 } 194 195 static int __maybe_unused ecb_decrypt(struct skcipher_request *req) 196 { 197 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 198 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 199 int err, rounds = 6 + ctx->key_length / 4; 200 struct skcipher_walk walk; 201 unsigned int blocks; 202 203 err = skcipher_walk_virt(&walk, req, false); 204 205 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 206 kernel_neon_begin(); 207 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 208 ctx->key_dec, rounds, blocks); 209 kernel_neon_end(); 210 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 211 } 212 return err; 213 } 214 215 static int cbc_encrypt_walk(struct skcipher_request *req, 216 struct skcipher_walk *walk) 217 { 218 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 219 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 220 int err = 0, rounds = 6 + ctx->key_length / 4; 221 unsigned int blocks; 222 223 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 224 kernel_neon_begin(); 225 aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr, 226 ctx->key_enc, rounds, blocks, walk->iv); 227 kernel_neon_end(); 228 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 229 } 230 return err; 231 } 232 233 static int __maybe_unused cbc_encrypt(struct skcipher_request *req) 234 { 235 struct skcipher_walk walk; 236 int err; 237 238 err = skcipher_walk_virt(&walk, req, false); 239 if (err) 240 return err; 241 return cbc_encrypt_walk(req, &walk); 242 } 243 244 static int cbc_decrypt_walk(struct skcipher_request *req, 245 struct skcipher_walk *walk) 246 { 247 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 248 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 249 int err = 0, rounds = 6 + ctx->key_length / 4; 250 unsigned int blocks; 251 252 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 253 kernel_neon_begin(); 254 aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr, 255 ctx->key_dec, rounds, blocks, walk->iv); 256 kernel_neon_end(); 257 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 258 } 259 return err; 260 } 261 262 static int __maybe_unused cbc_decrypt(struct skcipher_request *req) 263 { 264 struct skcipher_walk walk; 265 int err; 266 267 err = skcipher_walk_virt(&walk, req, false); 268 if (err) 269 return err; 270 return cbc_decrypt_walk(req, &walk); 271 } 272 273 static int cts_cbc_encrypt(struct skcipher_request *req) 274 { 275 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 276 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 277 int err, rounds = 6 + ctx->key_length / 4; 278 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 279 struct scatterlist *src = req->src, *dst = req->dst; 280 struct scatterlist sg_src[2], sg_dst[2]; 281 struct skcipher_request subreq; 282 struct skcipher_walk walk; 283 284 skcipher_request_set_tfm(&subreq, tfm); 285 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 286 NULL, NULL); 287 288 if (req->cryptlen <= AES_BLOCK_SIZE) { 289 if (req->cryptlen < AES_BLOCK_SIZE) 290 return -EINVAL; 291 cbc_blocks = 1; 292 } 293 294 if (cbc_blocks > 0) { 295 skcipher_request_set_crypt(&subreq, req->src, req->dst, 296 cbc_blocks * AES_BLOCK_SIZE, 297 req->iv); 298 299 err = skcipher_walk_virt(&walk, &subreq, false) ?: 300 cbc_encrypt_walk(&subreq, &walk); 301 if (err) 302 return err; 303 304 if (req->cryptlen == AES_BLOCK_SIZE) 305 return 0; 306 307 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 308 if (req->dst != req->src) 309 dst = scatterwalk_ffwd(sg_dst, req->dst, 310 subreq.cryptlen); 311 } 312 313 /* handle ciphertext stealing */ 314 skcipher_request_set_crypt(&subreq, src, dst, 315 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 316 req->iv); 317 318 err = skcipher_walk_virt(&walk, &subreq, false); 319 if (err) 320 return err; 321 322 kernel_neon_begin(); 323 aes_cbc_cts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 324 ctx->key_enc, rounds, walk.nbytes, walk.iv); 325 kernel_neon_end(); 326 327 return skcipher_walk_done(&walk, 0); 328 } 329 330 static int cts_cbc_decrypt(struct skcipher_request *req) 331 { 332 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 333 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 334 int err, rounds = 6 + ctx->key_length / 4; 335 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 336 struct scatterlist *src = req->src, *dst = req->dst; 337 struct scatterlist sg_src[2], sg_dst[2]; 338 struct skcipher_request subreq; 339 struct skcipher_walk walk; 340 341 skcipher_request_set_tfm(&subreq, tfm); 342 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 343 NULL, NULL); 344 345 if (req->cryptlen <= AES_BLOCK_SIZE) { 346 if (req->cryptlen < AES_BLOCK_SIZE) 347 return -EINVAL; 348 cbc_blocks = 1; 349 } 350 351 if (cbc_blocks > 0) { 352 skcipher_request_set_crypt(&subreq, req->src, req->dst, 353 cbc_blocks * AES_BLOCK_SIZE, 354 req->iv); 355 356 err = skcipher_walk_virt(&walk, &subreq, false) ?: 357 cbc_decrypt_walk(&subreq, &walk); 358 if (err) 359 return err; 360 361 if (req->cryptlen == AES_BLOCK_SIZE) 362 return 0; 363 364 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 365 if (req->dst != req->src) 366 dst = scatterwalk_ffwd(sg_dst, req->dst, 367 subreq.cryptlen); 368 } 369 370 /* handle ciphertext stealing */ 371 skcipher_request_set_crypt(&subreq, src, dst, 372 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 373 req->iv); 374 375 err = skcipher_walk_virt(&walk, &subreq, false); 376 if (err) 377 return err; 378 379 kernel_neon_begin(); 380 aes_cbc_cts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 381 ctx->key_dec, rounds, walk.nbytes, walk.iv); 382 kernel_neon_end(); 383 384 return skcipher_walk_done(&walk, 0); 385 } 386 387 static int __maybe_unused essiv_cbc_init_tfm(struct crypto_skcipher *tfm) 388 { 389 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 390 391 ctx->hash = crypto_alloc_shash("sha256", 0, 0); 392 393 return PTR_ERR_OR_ZERO(ctx->hash); 394 } 395 396 static void __maybe_unused essiv_cbc_exit_tfm(struct crypto_skcipher *tfm) 397 { 398 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 399 400 crypto_free_shash(ctx->hash); 401 } 402 403 static int __maybe_unused essiv_cbc_encrypt(struct skcipher_request *req) 404 { 405 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 406 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 407 int err, rounds = 6 + ctx->key1.key_length / 4; 408 struct skcipher_walk walk; 409 unsigned int blocks; 410 411 err = skcipher_walk_virt(&walk, req, false); 412 413 blocks = walk.nbytes / AES_BLOCK_SIZE; 414 if (blocks) { 415 kernel_neon_begin(); 416 aes_essiv_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 417 ctx->key1.key_enc, rounds, blocks, 418 req->iv, ctx->key2.key_enc); 419 kernel_neon_end(); 420 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 421 } 422 return err ?: cbc_encrypt_walk(req, &walk); 423 } 424 425 static int __maybe_unused essiv_cbc_decrypt(struct skcipher_request *req) 426 { 427 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 428 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 429 int err, rounds = 6 + ctx->key1.key_length / 4; 430 struct skcipher_walk walk; 431 unsigned int blocks; 432 433 err = skcipher_walk_virt(&walk, req, false); 434 435 blocks = walk.nbytes / AES_BLOCK_SIZE; 436 if (blocks) { 437 kernel_neon_begin(); 438 aes_essiv_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 439 ctx->key1.key_dec, rounds, blocks, 440 req->iv, ctx->key2.key_enc); 441 kernel_neon_end(); 442 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 443 } 444 return err ?: cbc_decrypt_walk(req, &walk); 445 } 446 447 static int ctr_encrypt(struct skcipher_request *req) 448 { 449 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 450 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 451 int err, rounds = 6 + ctx->key_length / 4; 452 struct skcipher_walk walk; 453 int blocks; 454 455 err = skcipher_walk_virt(&walk, req, false); 456 457 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 458 kernel_neon_begin(); 459 aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 460 ctx->key_enc, rounds, blocks, walk.iv); 461 kernel_neon_end(); 462 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 463 } 464 if (walk.nbytes) { 465 u8 __aligned(8) tail[AES_BLOCK_SIZE]; 466 unsigned int nbytes = walk.nbytes; 467 u8 *tdst = walk.dst.virt.addr; 468 u8 *tsrc = walk.src.virt.addr; 469 470 /* 471 * Tell aes_ctr_encrypt() to process a tail block. 472 */ 473 blocks = -1; 474 475 kernel_neon_begin(); 476 aes_ctr_encrypt(tail, NULL, ctx->key_enc, rounds, 477 blocks, walk.iv); 478 kernel_neon_end(); 479 crypto_xor_cpy(tdst, tsrc, tail, nbytes); 480 err = skcipher_walk_done(&walk, 0); 481 } 482 483 return err; 484 } 485 486 static void ctr_encrypt_one(struct crypto_skcipher *tfm, const u8 *src, u8 *dst) 487 { 488 const struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 489 unsigned long flags; 490 491 /* 492 * Temporarily disable interrupts to avoid races where 493 * cachelines are evicted when the CPU is interrupted 494 * to do something else. 495 */ 496 local_irq_save(flags); 497 aes_encrypt(ctx, dst, src); 498 local_irq_restore(flags); 499 } 500 501 static int __maybe_unused ctr_encrypt_sync(struct skcipher_request *req) 502 { 503 if (!crypto_simd_usable()) 504 return crypto_ctr_encrypt_walk(req, ctr_encrypt_one); 505 506 return ctr_encrypt(req); 507 } 508 509 static int __maybe_unused xts_encrypt(struct skcipher_request *req) 510 { 511 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 512 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 513 int err, first, rounds = 6 + ctx->key1.key_length / 4; 514 int tail = req->cryptlen % AES_BLOCK_SIZE; 515 struct scatterlist sg_src[2], sg_dst[2]; 516 struct skcipher_request subreq; 517 struct scatterlist *src, *dst; 518 struct skcipher_walk walk; 519 520 if (req->cryptlen < AES_BLOCK_SIZE) 521 return -EINVAL; 522 523 err = skcipher_walk_virt(&walk, req, false); 524 525 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 526 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 527 AES_BLOCK_SIZE) - 2; 528 529 skcipher_walk_abort(&walk); 530 531 skcipher_request_set_tfm(&subreq, tfm); 532 skcipher_request_set_callback(&subreq, 533 skcipher_request_flags(req), 534 NULL, NULL); 535 skcipher_request_set_crypt(&subreq, req->src, req->dst, 536 xts_blocks * AES_BLOCK_SIZE, 537 req->iv); 538 req = &subreq; 539 err = skcipher_walk_virt(&walk, req, false); 540 } else { 541 tail = 0; 542 } 543 544 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 545 int nbytes = walk.nbytes; 546 547 if (walk.nbytes < walk.total) 548 nbytes &= ~(AES_BLOCK_SIZE - 1); 549 550 kernel_neon_begin(); 551 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 552 ctx->key1.key_enc, rounds, nbytes, 553 ctx->key2.key_enc, walk.iv, first); 554 kernel_neon_end(); 555 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 556 } 557 558 if (err || likely(!tail)) 559 return err; 560 561 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 562 if (req->dst != req->src) 563 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 564 565 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 566 req->iv); 567 568 err = skcipher_walk_virt(&walk, &subreq, false); 569 if (err) 570 return err; 571 572 kernel_neon_begin(); 573 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 574 ctx->key1.key_enc, rounds, walk.nbytes, 575 ctx->key2.key_enc, walk.iv, first); 576 kernel_neon_end(); 577 578 return skcipher_walk_done(&walk, 0); 579 } 580 581 static int __maybe_unused xts_decrypt(struct skcipher_request *req) 582 { 583 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 584 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 585 int err, first, rounds = 6 + ctx->key1.key_length / 4; 586 int tail = req->cryptlen % AES_BLOCK_SIZE; 587 struct scatterlist sg_src[2], sg_dst[2]; 588 struct skcipher_request subreq; 589 struct scatterlist *src, *dst; 590 struct skcipher_walk walk; 591 592 if (req->cryptlen < AES_BLOCK_SIZE) 593 return -EINVAL; 594 595 err = skcipher_walk_virt(&walk, req, false); 596 597 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 598 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 599 AES_BLOCK_SIZE) - 2; 600 601 skcipher_walk_abort(&walk); 602 603 skcipher_request_set_tfm(&subreq, tfm); 604 skcipher_request_set_callback(&subreq, 605 skcipher_request_flags(req), 606 NULL, NULL); 607 skcipher_request_set_crypt(&subreq, req->src, req->dst, 608 xts_blocks * AES_BLOCK_SIZE, 609 req->iv); 610 req = &subreq; 611 err = skcipher_walk_virt(&walk, req, false); 612 } else { 613 tail = 0; 614 } 615 616 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 617 int nbytes = walk.nbytes; 618 619 if (walk.nbytes < walk.total) 620 nbytes &= ~(AES_BLOCK_SIZE - 1); 621 622 kernel_neon_begin(); 623 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 624 ctx->key1.key_dec, rounds, nbytes, 625 ctx->key2.key_enc, walk.iv, first); 626 kernel_neon_end(); 627 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 628 } 629 630 if (err || likely(!tail)) 631 return err; 632 633 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 634 if (req->dst != req->src) 635 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 636 637 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 638 req->iv); 639 640 err = skcipher_walk_virt(&walk, &subreq, false); 641 if (err) 642 return err; 643 644 645 kernel_neon_begin(); 646 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 647 ctx->key1.key_dec, rounds, walk.nbytes, 648 ctx->key2.key_enc, walk.iv, first); 649 kernel_neon_end(); 650 651 return skcipher_walk_done(&walk, 0); 652 } 653 654 static struct skcipher_alg aes_algs[] = { { 655 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !defined(CONFIG_CRYPTO_AES_ARM64_BS) 656 .base = { 657 .cra_name = "__ecb(aes)", 658 .cra_driver_name = "__ecb-aes-" MODE, 659 .cra_priority = PRIO, 660 .cra_flags = CRYPTO_ALG_INTERNAL, 661 .cra_blocksize = AES_BLOCK_SIZE, 662 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 663 .cra_module = THIS_MODULE, 664 }, 665 .min_keysize = AES_MIN_KEY_SIZE, 666 .max_keysize = AES_MAX_KEY_SIZE, 667 .setkey = skcipher_aes_setkey, 668 .encrypt = ecb_encrypt, 669 .decrypt = ecb_decrypt, 670 }, { 671 .base = { 672 .cra_name = "__cbc(aes)", 673 .cra_driver_name = "__cbc-aes-" MODE, 674 .cra_priority = PRIO, 675 .cra_flags = CRYPTO_ALG_INTERNAL, 676 .cra_blocksize = AES_BLOCK_SIZE, 677 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 678 .cra_module = THIS_MODULE, 679 }, 680 .min_keysize = AES_MIN_KEY_SIZE, 681 .max_keysize = AES_MAX_KEY_SIZE, 682 .ivsize = AES_BLOCK_SIZE, 683 .setkey = skcipher_aes_setkey, 684 .encrypt = cbc_encrypt, 685 .decrypt = cbc_decrypt, 686 }, { 687 .base = { 688 .cra_name = "__ctr(aes)", 689 .cra_driver_name = "__ctr-aes-" MODE, 690 .cra_priority = PRIO, 691 .cra_flags = CRYPTO_ALG_INTERNAL, 692 .cra_blocksize = 1, 693 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 694 .cra_module = THIS_MODULE, 695 }, 696 .min_keysize = AES_MIN_KEY_SIZE, 697 .max_keysize = AES_MAX_KEY_SIZE, 698 .ivsize = AES_BLOCK_SIZE, 699 .chunksize = AES_BLOCK_SIZE, 700 .setkey = skcipher_aes_setkey, 701 .encrypt = ctr_encrypt, 702 .decrypt = ctr_encrypt, 703 }, { 704 .base = { 705 .cra_name = "ctr(aes)", 706 .cra_driver_name = "ctr-aes-" MODE, 707 .cra_priority = PRIO - 1, 708 .cra_blocksize = 1, 709 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 710 .cra_module = THIS_MODULE, 711 }, 712 .min_keysize = AES_MIN_KEY_SIZE, 713 .max_keysize = AES_MAX_KEY_SIZE, 714 .ivsize = AES_BLOCK_SIZE, 715 .chunksize = AES_BLOCK_SIZE, 716 .setkey = skcipher_aes_setkey, 717 .encrypt = ctr_encrypt_sync, 718 .decrypt = ctr_encrypt_sync, 719 }, { 720 .base = { 721 .cra_name = "__xts(aes)", 722 .cra_driver_name = "__xts-aes-" MODE, 723 .cra_priority = PRIO, 724 .cra_flags = CRYPTO_ALG_INTERNAL, 725 .cra_blocksize = AES_BLOCK_SIZE, 726 .cra_ctxsize = sizeof(struct crypto_aes_xts_ctx), 727 .cra_module = THIS_MODULE, 728 }, 729 .min_keysize = 2 * AES_MIN_KEY_SIZE, 730 .max_keysize = 2 * AES_MAX_KEY_SIZE, 731 .ivsize = AES_BLOCK_SIZE, 732 .walksize = 2 * AES_BLOCK_SIZE, 733 .setkey = xts_set_key, 734 .encrypt = xts_encrypt, 735 .decrypt = xts_decrypt, 736 }, { 737 #endif 738 .base = { 739 .cra_name = "__cts(cbc(aes))", 740 .cra_driver_name = "__cts-cbc-aes-" MODE, 741 .cra_priority = PRIO, 742 .cra_flags = CRYPTO_ALG_INTERNAL, 743 .cra_blocksize = AES_BLOCK_SIZE, 744 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 745 .cra_module = THIS_MODULE, 746 }, 747 .min_keysize = AES_MIN_KEY_SIZE, 748 .max_keysize = AES_MAX_KEY_SIZE, 749 .ivsize = AES_BLOCK_SIZE, 750 .walksize = 2 * AES_BLOCK_SIZE, 751 .setkey = skcipher_aes_setkey, 752 .encrypt = cts_cbc_encrypt, 753 .decrypt = cts_cbc_decrypt, 754 }, { 755 .base = { 756 .cra_name = "__essiv(cbc(aes),sha256)", 757 .cra_driver_name = "__essiv-cbc-aes-sha256-" MODE, 758 .cra_priority = PRIO + 1, 759 .cra_flags = CRYPTO_ALG_INTERNAL, 760 .cra_blocksize = AES_BLOCK_SIZE, 761 .cra_ctxsize = sizeof(struct crypto_aes_essiv_cbc_ctx), 762 .cra_module = THIS_MODULE, 763 }, 764 .min_keysize = AES_MIN_KEY_SIZE, 765 .max_keysize = AES_MAX_KEY_SIZE, 766 .ivsize = AES_BLOCK_SIZE, 767 .setkey = essiv_cbc_set_key, 768 .encrypt = essiv_cbc_encrypt, 769 .decrypt = essiv_cbc_decrypt, 770 .init = essiv_cbc_init_tfm, 771 .exit = essiv_cbc_exit_tfm, 772 } }; 773 774 static int cbcmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 775 unsigned int key_len) 776 { 777 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 778 779 return aes_expandkey(&ctx->key, in_key, key_len); 780 } 781 782 static void cmac_gf128_mul_by_x(be128 *y, const be128 *x) 783 { 784 u64 a = be64_to_cpu(x->a); 785 u64 b = be64_to_cpu(x->b); 786 787 y->a = cpu_to_be64((a << 1) | (b >> 63)); 788 y->b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0)); 789 } 790 791 static int cmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 792 unsigned int key_len) 793 { 794 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 795 be128 *consts = (be128 *)ctx->consts; 796 int rounds = 6 + key_len / 4; 797 int err; 798 799 err = cbcmac_setkey(tfm, in_key, key_len); 800 if (err) 801 return err; 802 803 /* encrypt the zero vector */ 804 kernel_neon_begin(); 805 aes_ecb_encrypt(ctx->consts, (u8[AES_BLOCK_SIZE]){}, ctx->key.key_enc, 806 rounds, 1); 807 kernel_neon_end(); 808 809 cmac_gf128_mul_by_x(consts, consts); 810 cmac_gf128_mul_by_x(consts + 1, consts); 811 812 return 0; 813 } 814 815 static int xcbc_setkey(struct crypto_shash *tfm, const u8 *in_key, 816 unsigned int key_len) 817 { 818 static u8 const ks[3][AES_BLOCK_SIZE] = { 819 { [0 ... AES_BLOCK_SIZE - 1] = 0x1 }, 820 { [0 ... AES_BLOCK_SIZE - 1] = 0x2 }, 821 { [0 ... AES_BLOCK_SIZE - 1] = 0x3 }, 822 }; 823 824 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 825 int rounds = 6 + key_len / 4; 826 u8 key[AES_BLOCK_SIZE]; 827 int err; 828 829 err = cbcmac_setkey(tfm, in_key, key_len); 830 if (err) 831 return err; 832 833 kernel_neon_begin(); 834 aes_ecb_encrypt(key, ks[0], ctx->key.key_enc, rounds, 1); 835 aes_ecb_encrypt(ctx->consts, ks[1], ctx->key.key_enc, rounds, 2); 836 kernel_neon_end(); 837 838 return cbcmac_setkey(tfm, key, sizeof(key)); 839 } 840 841 static int mac_init(struct shash_desc *desc) 842 { 843 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 844 845 memset(ctx->dg, 0, AES_BLOCK_SIZE); 846 ctx->len = 0; 847 848 return 0; 849 } 850 851 static void mac_do_update(struct crypto_aes_ctx *ctx, u8 const in[], int blocks, 852 u8 dg[], int enc_before, int enc_after) 853 { 854 int rounds = 6 + ctx->key_length / 4; 855 856 if (crypto_simd_usable()) { 857 kernel_neon_begin(); 858 aes_mac_update(in, ctx->key_enc, rounds, blocks, dg, enc_before, 859 enc_after); 860 kernel_neon_end(); 861 } else { 862 if (enc_before) 863 aes_encrypt(ctx, dg, dg); 864 865 while (blocks--) { 866 crypto_xor(dg, in, AES_BLOCK_SIZE); 867 in += AES_BLOCK_SIZE; 868 869 if (blocks || enc_after) 870 aes_encrypt(ctx, dg, dg); 871 } 872 } 873 } 874 875 static int mac_update(struct shash_desc *desc, const u8 *p, unsigned int len) 876 { 877 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 878 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 879 880 while (len > 0) { 881 unsigned int l; 882 883 if ((ctx->len % AES_BLOCK_SIZE) == 0 && 884 (ctx->len + len) > AES_BLOCK_SIZE) { 885 886 int blocks = len / AES_BLOCK_SIZE; 887 888 len %= AES_BLOCK_SIZE; 889 890 mac_do_update(&tctx->key, p, blocks, ctx->dg, 891 (ctx->len != 0), (len != 0)); 892 893 p += blocks * AES_BLOCK_SIZE; 894 895 if (!len) { 896 ctx->len = AES_BLOCK_SIZE; 897 break; 898 } 899 ctx->len = 0; 900 } 901 902 l = min(len, AES_BLOCK_SIZE - ctx->len); 903 904 if (l <= AES_BLOCK_SIZE) { 905 crypto_xor(ctx->dg + ctx->len, p, l); 906 ctx->len += l; 907 len -= l; 908 p += l; 909 } 910 } 911 912 return 0; 913 } 914 915 static int cbcmac_final(struct shash_desc *desc, u8 *out) 916 { 917 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 918 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 919 920 mac_do_update(&tctx->key, NULL, 0, ctx->dg, (ctx->len != 0), 0); 921 922 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 923 924 return 0; 925 } 926 927 static int cmac_final(struct shash_desc *desc, u8 *out) 928 { 929 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 930 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 931 u8 *consts = tctx->consts; 932 933 if (ctx->len != AES_BLOCK_SIZE) { 934 ctx->dg[ctx->len] ^= 0x80; 935 consts += AES_BLOCK_SIZE; 936 } 937 938 mac_do_update(&tctx->key, consts, 1, ctx->dg, 0, 1); 939 940 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 941 942 return 0; 943 } 944 945 static struct shash_alg mac_algs[] = { { 946 .base.cra_name = "cmac(aes)", 947 .base.cra_driver_name = "cmac-aes-" MODE, 948 .base.cra_priority = PRIO, 949 .base.cra_blocksize = AES_BLOCK_SIZE, 950 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 951 2 * AES_BLOCK_SIZE, 952 .base.cra_module = THIS_MODULE, 953 954 .digestsize = AES_BLOCK_SIZE, 955 .init = mac_init, 956 .update = mac_update, 957 .final = cmac_final, 958 .setkey = cmac_setkey, 959 .descsize = sizeof(struct mac_desc_ctx), 960 }, { 961 .base.cra_name = "xcbc(aes)", 962 .base.cra_driver_name = "xcbc-aes-" MODE, 963 .base.cra_priority = PRIO, 964 .base.cra_blocksize = AES_BLOCK_SIZE, 965 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 966 2 * AES_BLOCK_SIZE, 967 .base.cra_module = THIS_MODULE, 968 969 .digestsize = AES_BLOCK_SIZE, 970 .init = mac_init, 971 .update = mac_update, 972 .final = cmac_final, 973 .setkey = xcbc_setkey, 974 .descsize = sizeof(struct mac_desc_ctx), 975 }, { 976 .base.cra_name = "cbcmac(aes)", 977 .base.cra_driver_name = "cbcmac-aes-" MODE, 978 .base.cra_priority = PRIO, 979 .base.cra_blocksize = 1, 980 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx), 981 .base.cra_module = THIS_MODULE, 982 983 .digestsize = AES_BLOCK_SIZE, 984 .init = mac_init, 985 .update = mac_update, 986 .final = cbcmac_final, 987 .setkey = cbcmac_setkey, 988 .descsize = sizeof(struct mac_desc_ctx), 989 } }; 990 991 static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)]; 992 993 static void aes_exit(void) 994 { 995 int i; 996 997 for (i = 0; i < ARRAY_SIZE(aes_simd_algs); i++) 998 if (aes_simd_algs[i]) 999 simd_skcipher_free(aes_simd_algs[i]); 1000 1001 crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1002 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1003 } 1004 1005 static int __init aes_init(void) 1006 { 1007 struct simd_skcipher_alg *simd; 1008 const char *basename; 1009 const char *algname; 1010 const char *drvname; 1011 int err; 1012 int i; 1013 1014 err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1015 if (err) 1016 return err; 1017 1018 err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1019 if (err) 1020 goto unregister_ciphers; 1021 1022 for (i = 0; i < ARRAY_SIZE(aes_algs); i++) { 1023 if (!(aes_algs[i].base.cra_flags & CRYPTO_ALG_INTERNAL)) 1024 continue; 1025 1026 algname = aes_algs[i].base.cra_name + 2; 1027 drvname = aes_algs[i].base.cra_driver_name + 2; 1028 basename = aes_algs[i].base.cra_driver_name; 1029 simd = simd_skcipher_create_compat(algname, drvname, basename); 1030 err = PTR_ERR(simd); 1031 if (IS_ERR(simd)) 1032 goto unregister_simds; 1033 1034 aes_simd_algs[i] = simd; 1035 } 1036 1037 return 0; 1038 1039 unregister_simds: 1040 aes_exit(); 1041 return err; 1042 unregister_ciphers: 1043 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1044 return err; 1045 } 1046 1047 #ifdef USE_V8_CRYPTO_EXTENSIONS 1048 module_cpu_feature_match(AES, aes_init); 1049 #else 1050 module_init(aes_init); 1051 EXPORT_SYMBOL(neon_aes_ecb_encrypt); 1052 EXPORT_SYMBOL(neon_aes_cbc_encrypt); 1053 EXPORT_SYMBOL(neon_aes_xts_encrypt); 1054 EXPORT_SYMBOL(neon_aes_xts_decrypt); 1055 #endif 1056 module_exit(aes_exit); 1057