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_xctr_encrypt ce_aes_xctr_encrypt 38 #define aes_xts_encrypt ce_aes_xts_encrypt 39 #define aes_xts_decrypt ce_aes_xts_decrypt 40 #define aes_mac_update ce_aes_mac_update 41 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS/XCTR using ARMv8 Crypto Extensions"); 42 #else 43 #define MODE "neon" 44 #define PRIO 200 45 #define aes_ecb_encrypt neon_aes_ecb_encrypt 46 #define aes_ecb_decrypt neon_aes_ecb_decrypt 47 #define aes_cbc_encrypt neon_aes_cbc_encrypt 48 #define aes_cbc_decrypt neon_aes_cbc_decrypt 49 #define aes_cbc_cts_encrypt neon_aes_cbc_cts_encrypt 50 #define aes_cbc_cts_decrypt neon_aes_cbc_cts_decrypt 51 #define aes_essiv_cbc_encrypt neon_aes_essiv_cbc_encrypt 52 #define aes_essiv_cbc_decrypt neon_aes_essiv_cbc_decrypt 53 #define aes_ctr_encrypt neon_aes_ctr_encrypt 54 #define aes_xctr_encrypt neon_aes_xctr_encrypt 55 #define aes_xts_encrypt neon_aes_xts_encrypt 56 #define aes_xts_decrypt neon_aes_xts_decrypt 57 #define aes_mac_update neon_aes_mac_update 58 MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS/XCTR using ARMv8 NEON"); 59 #endif 60 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS) 61 MODULE_ALIAS_CRYPTO("ecb(aes)"); 62 MODULE_ALIAS_CRYPTO("cbc(aes)"); 63 MODULE_ALIAS_CRYPTO("ctr(aes)"); 64 MODULE_ALIAS_CRYPTO("xts(aes)"); 65 MODULE_ALIAS_CRYPTO("xctr(aes)"); 66 #endif 67 MODULE_ALIAS_CRYPTO("cts(cbc(aes))"); 68 MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)"); 69 MODULE_ALIAS_CRYPTO("cmac(aes)"); 70 MODULE_ALIAS_CRYPTO("xcbc(aes)"); 71 MODULE_ALIAS_CRYPTO("cbcmac(aes)"); 72 73 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>"); 74 MODULE_LICENSE("GPL v2"); 75 76 /* defined in aes-modes.S */ 77 asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u32 const rk[], 78 int rounds, int blocks); 79 asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u32 const rk[], 80 int rounds, int blocks); 81 82 asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u32 const rk[], 83 int rounds, int blocks, u8 iv[]); 84 asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u32 const rk[], 85 int rounds, int blocks, u8 iv[]); 86 87 asmlinkage void aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[], 88 int rounds, int bytes, u8 const iv[]); 89 asmlinkage void aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[], 90 int rounds, int bytes, u8 const iv[]); 91 92 asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u32 const rk[], 93 int rounds, int bytes, u8 ctr[]); 94 95 asmlinkage void aes_xctr_encrypt(u8 out[], u8 const in[], u32 const rk[], 96 int rounds, int bytes, u8 ctr[], int byte_ctr); 97 98 asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u32 const rk1[], 99 int rounds, int bytes, u32 const rk2[], u8 iv[], 100 int first); 101 asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u32 const rk1[], 102 int rounds, int bytes, u32 const rk2[], u8 iv[], 103 int first); 104 105 asmlinkage void aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[], 106 int rounds, int blocks, u8 iv[], 107 u32 const rk2[]); 108 asmlinkage void aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[], 109 int rounds, int blocks, u8 iv[], 110 u32 const rk2[]); 111 112 asmlinkage int aes_mac_update(u8 const in[], u32 const rk[], int rounds, 113 int blocks, u8 dg[], int enc_before, 114 int enc_after); 115 116 struct crypto_aes_xts_ctx { 117 struct crypto_aes_ctx key1; 118 struct crypto_aes_ctx __aligned(8) key2; 119 }; 120 121 struct crypto_aes_essiv_cbc_ctx { 122 struct crypto_aes_ctx key1; 123 struct crypto_aes_ctx __aligned(8) key2; 124 struct crypto_shash *hash; 125 }; 126 127 struct mac_tfm_ctx { 128 struct crypto_aes_ctx key; 129 u8 __aligned(8) consts[]; 130 }; 131 132 struct mac_desc_ctx { 133 unsigned int len; 134 u8 dg[AES_BLOCK_SIZE]; 135 }; 136 137 static int skcipher_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key, 138 unsigned int key_len) 139 { 140 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 141 142 return aes_expandkey(ctx, in_key, key_len); 143 } 144 145 static int __maybe_unused xts_set_key(struct crypto_skcipher *tfm, 146 const u8 *in_key, unsigned int key_len) 147 { 148 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 149 int ret; 150 151 ret = xts_verify_key(tfm, in_key, key_len); 152 if (ret) 153 return ret; 154 155 ret = aes_expandkey(&ctx->key1, in_key, key_len / 2); 156 if (!ret) 157 ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2], 158 key_len / 2); 159 return ret; 160 } 161 162 static int __maybe_unused essiv_cbc_set_key(struct crypto_skcipher *tfm, 163 const u8 *in_key, 164 unsigned int key_len) 165 { 166 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 167 u8 digest[SHA256_DIGEST_SIZE]; 168 int ret; 169 170 ret = aes_expandkey(&ctx->key1, in_key, key_len); 171 if (ret) 172 return ret; 173 174 crypto_shash_tfm_digest(ctx->hash, in_key, key_len, digest); 175 176 return aes_expandkey(&ctx->key2, digest, sizeof(digest)); 177 } 178 179 static int __maybe_unused ecb_encrypt(struct skcipher_request *req) 180 { 181 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 182 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 183 int err, rounds = 6 + ctx->key_length / 4; 184 struct skcipher_walk walk; 185 unsigned int blocks; 186 187 err = skcipher_walk_virt(&walk, req, false); 188 189 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 190 kernel_neon_begin(); 191 aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 192 ctx->key_enc, rounds, blocks); 193 kernel_neon_end(); 194 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 195 } 196 return err; 197 } 198 199 static int __maybe_unused ecb_decrypt(struct skcipher_request *req) 200 { 201 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 202 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 203 int err, rounds = 6 + ctx->key_length / 4; 204 struct skcipher_walk walk; 205 unsigned int blocks; 206 207 err = skcipher_walk_virt(&walk, req, false); 208 209 while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { 210 kernel_neon_begin(); 211 aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 212 ctx->key_dec, rounds, blocks); 213 kernel_neon_end(); 214 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 215 } 216 return err; 217 } 218 219 static int cbc_encrypt_walk(struct skcipher_request *req, 220 struct skcipher_walk *walk) 221 { 222 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 223 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 224 int err = 0, rounds = 6 + ctx->key_length / 4; 225 unsigned int blocks; 226 227 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 228 kernel_neon_begin(); 229 aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr, 230 ctx->key_enc, rounds, blocks, walk->iv); 231 kernel_neon_end(); 232 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 233 } 234 return err; 235 } 236 237 static int __maybe_unused cbc_encrypt(struct skcipher_request *req) 238 { 239 struct skcipher_walk walk; 240 int err; 241 242 err = skcipher_walk_virt(&walk, req, false); 243 if (err) 244 return err; 245 return cbc_encrypt_walk(req, &walk); 246 } 247 248 static int cbc_decrypt_walk(struct skcipher_request *req, 249 struct skcipher_walk *walk) 250 { 251 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 252 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 253 int err = 0, rounds = 6 + ctx->key_length / 4; 254 unsigned int blocks; 255 256 while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { 257 kernel_neon_begin(); 258 aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr, 259 ctx->key_dec, rounds, blocks, walk->iv); 260 kernel_neon_end(); 261 err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); 262 } 263 return err; 264 } 265 266 static int __maybe_unused cbc_decrypt(struct skcipher_request *req) 267 { 268 struct skcipher_walk walk; 269 int err; 270 271 err = skcipher_walk_virt(&walk, req, false); 272 if (err) 273 return err; 274 return cbc_decrypt_walk(req, &walk); 275 } 276 277 static int cts_cbc_encrypt(struct skcipher_request *req) 278 { 279 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 280 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 281 int err, rounds = 6 + ctx->key_length / 4; 282 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 283 struct scatterlist *src = req->src, *dst = req->dst; 284 struct scatterlist sg_src[2], sg_dst[2]; 285 struct skcipher_request subreq; 286 struct skcipher_walk walk; 287 288 skcipher_request_set_tfm(&subreq, tfm); 289 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 290 NULL, NULL); 291 292 if (req->cryptlen <= AES_BLOCK_SIZE) { 293 if (req->cryptlen < AES_BLOCK_SIZE) 294 return -EINVAL; 295 cbc_blocks = 1; 296 } 297 298 if (cbc_blocks > 0) { 299 skcipher_request_set_crypt(&subreq, req->src, req->dst, 300 cbc_blocks * AES_BLOCK_SIZE, 301 req->iv); 302 303 err = skcipher_walk_virt(&walk, &subreq, false) ?: 304 cbc_encrypt_walk(&subreq, &walk); 305 if (err) 306 return err; 307 308 if (req->cryptlen == AES_BLOCK_SIZE) 309 return 0; 310 311 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 312 if (req->dst != req->src) 313 dst = scatterwalk_ffwd(sg_dst, req->dst, 314 subreq.cryptlen); 315 } 316 317 /* handle ciphertext stealing */ 318 skcipher_request_set_crypt(&subreq, src, dst, 319 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 320 req->iv); 321 322 err = skcipher_walk_virt(&walk, &subreq, false); 323 if (err) 324 return err; 325 326 kernel_neon_begin(); 327 aes_cbc_cts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 328 ctx->key_enc, rounds, walk.nbytes, walk.iv); 329 kernel_neon_end(); 330 331 return skcipher_walk_done(&walk, 0); 332 } 333 334 static int cts_cbc_decrypt(struct skcipher_request *req) 335 { 336 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 337 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 338 int err, rounds = 6 + ctx->key_length / 4; 339 int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2; 340 struct scatterlist *src = req->src, *dst = req->dst; 341 struct scatterlist sg_src[2], sg_dst[2]; 342 struct skcipher_request subreq; 343 struct skcipher_walk walk; 344 345 skcipher_request_set_tfm(&subreq, tfm); 346 skcipher_request_set_callback(&subreq, skcipher_request_flags(req), 347 NULL, NULL); 348 349 if (req->cryptlen <= AES_BLOCK_SIZE) { 350 if (req->cryptlen < AES_BLOCK_SIZE) 351 return -EINVAL; 352 cbc_blocks = 1; 353 } 354 355 if (cbc_blocks > 0) { 356 skcipher_request_set_crypt(&subreq, req->src, req->dst, 357 cbc_blocks * AES_BLOCK_SIZE, 358 req->iv); 359 360 err = skcipher_walk_virt(&walk, &subreq, false) ?: 361 cbc_decrypt_walk(&subreq, &walk); 362 if (err) 363 return err; 364 365 if (req->cryptlen == AES_BLOCK_SIZE) 366 return 0; 367 368 dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen); 369 if (req->dst != req->src) 370 dst = scatterwalk_ffwd(sg_dst, req->dst, 371 subreq.cryptlen); 372 } 373 374 /* handle ciphertext stealing */ 375 skcipher_request_set_crypt(&subreq, src, dst, 376 req->cryptlen - cbc_blocks * AES_BLOCK_SIZE, 377 req->iv); 378 379 err = skcipher_walk_virt(&walk, &subreq, false); 380 if (err) 381 return err; 382 383 kernel_neon_begin(); 384 aes_cbc_cts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 385 ctx->key_dec, rounds, walk.nbytes, walk.iv); 386 kernel_neon_end(); 387 388 return skcipher_walk_done(&walk, 0); 389 } 390 391 static int __maybe_unused essiv_cbc_init_tfm(struct crypto_skcipher *tfm) 392 { 393 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 394 395 ctx->hash = crypto_alloc_shash("sha256", 0, 0); 396 397 return PTR_ERR_OR_ZERO(ctx->hash); 398 } 399 400 static void __maybe_unused essiv_cbc_exit_tfm(struct crypto_skcipher *tfm) 401 { 402 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 403 404 crypto_free_shash(ctx->hash); 405 } 406 407 static int __maybe_unused essiv_cbc_encrypt(struct skcipher_request *req) 408 { 409 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 410 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 411 int err, rounds = 6 + ctx->key1.key_length / 4; 412 struct skcipher_walk walk; 413 unsigned int blocks; 414 415 err = skcipher_walk_virt(&walk, req, false); 416 417 blocks = walk.nbytes / AES_BLOCK_SIZE; 418 if (blocks) { 419 kernel_neon_begin(); 420 aes_essiv_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 421 ctx->key1.key_enc, rounds, blocks, 422 req->iv, ctx->key2.key_enc); 423 kernel_neon_end(); 424 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 425 } 426 return err ?: cbc_encrypt_walk(req, &walk); 427 } 428 429 static int __maybe_unused essiv_cbc_decrypt(struct skcipher_request *req) 430 { 431 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 432 struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm); 433 int err, rounds = 6 + ctx->key1.key_length / 4; 434 struct skcipher_walk walk; 435 unsigned int blocks; 436 437 err = skcipher_walk_virt(&walk, req, false); 438 439 blocks = walk.nbytes / AES_BLOCK_SIZE; 440 if (blocks) { 441 kernel_neon_begin(); 442 aes_essiv_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 443 ctx->key1.key_dec, rounds, blocks, 444 req->iv, ctx->key2.key_enc); 445 kernel_neon_end(); 446 err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); 447 } 448 return err ?: cbc_decrypt_walk(req, &walk); 449 } 450 451 static int __maybe_unused xctr_encrypt(struct skcipher_request *req) 452 { 453 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 454 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 455 int err, rounds = 6 + ctx->key_length / 4; 456 struct skcipher_walk walk; 457 unsigned int byte_ctr = 0; 458 459 err = skcipher_walk_virt(&walk, req, false); 460 461 while (walk.nbytes > 0) { 462 const u8 *src = walk.src.virt.addr; 463 unsigned int nbytes = walk.nbytes; 464 u8 *dst = walk.dst.virt.addr; 465 u8 buf[AES_BLOCK_SIZE]; 466 467 /* 468 * If given less than 16 bytes, we must copy the partial block 469 * into a temporary buffer of 16 bytes to avoid out of bounds 470 * reads and writes. Furthermore, this code is somewhat unusual 471 * in that it expects the end of the data to be at the end of 472 * the temporary buffer, rather than the start of the data at 473 * the start of the temporary buffer. 474 */ 475 if (unlikely(nbytes < AES_BLOCK_SIZE)) 476 src = dst = memcpy(buf + sizeof(buf) - nbytes, 477 src, nbytes); 478 else if (nbytes < walk.total) 479 nbytes &= ~(AES_BLOCK_SIZE - 1); 480 481 kernel_neon_begin(); 482 aes_xctr_encrypt(dst, src, ctx->key_enc, rounds, nbytes, 483 walk.iv, byte_ctr); 484 kernel_neon_end(); 485 486 if (unlikely(nbytes < AES_BLOCK_SIZE)) 487 memcpy(walk.dst.virt.addr, 488 buf + sizeof(buf) - nbytes, nbytes); 489 byte_ctr += nbytes; 490 491 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 492 } 493 494 return err; 495 } 496 497 static int __maybe_unused ctr_encrypt(struct skcipher_request *req) 498 { 499 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 500 struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); 501 int err, rounds = 6 + ctx->key_length / 4; 502 struct skcipher_walk walk; 503 504 err = skcipher_walk_virt(&walk, req, false); 505 506 while (walk.nbytes > 0) { 507 const u8 *src = walk.src.virt.addr; 508 unsigned int nbytes = walk.nbytes; 509 u8 *dst = walk.dst.virt.addr; 510 u8 buf[AES_BLOCK_SIZE]; 511 512 /* 513 * If given less than 16 bytes, we must copy the partial block 514 * into a temporary buffer of 16 bytes to avoid out of bounds 515 * reads and writes. Furthermore, this code is somewhat unusual 516 * in that it expects the end of the data to be at the end of 517 * the temporary buffer, rather than the start of the data at 518 * the start of the temporary buffer. 519 */ 520 if (unlikely(nbytes < AES_BLOCK_SIZE)) 521 src = dst = memcpy(buf + sizeof(buf) - nbytes, 522 src, nbytes); 523 else if (nbytes < walk.total) 524 nbytes &= ~(AES_BLOCK_SIZE - 1); 525 526 kernel_neon_begin(); 527 aes_ctr_encrypt(dst, src, ctx->key_enc, rounds, nbytes, 528 walk.iv); 529 kernel_neon_end(); 530 531 if (unlikely(nbytes < AES_BLOCK_SIZE)) 532 memcpy(walk.dst.virt.addr, 533 buf + sizeof(buf) - nbytes, nbytes); 534 535 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 536 } 537 538 return err; 539 } 540 541 static int __maybe_unused xts_encrypt(struct skcipher_request *req) 542 { 543 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 544 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 545 int err, first, rounds = 6 + ctx->key1.key_length / 4; 546 int tail = req->cryptlen % AES_BLOCK_SIZE; 547 struct scatterlist sg_src[2], sg_dst[2]; 548 struct skcipher_request subreq; 549 struct scatterlist *src, *dst; 550 struct skcipher_walk walk; 551 552 if (req->cryptlen < AES_BLOCK_SIZE) 553 return -EINVAL; 554 555 err = skcipher_walk_virt(&walk, req, false); 556 557 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 558 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 559 AES_BLOCK_SIZE) - 2; 560 561 skcipher_walk_abort(&walk); 562 563 skcipher_request_set_tfm(&subreq, tfm); 564 skcipher_request_set_callback(&subreq, 565 skcipher_request_flags(req), 566 NULL, NULL); 567 skcipher_request_set_crypt(&subreq, req->src, req->dst, 568 xts_blocks * AES_BLOCK_SIZE, 569 req->iv); 570 req = &subreq; 571 err = skcipher_walk_virt(&walk, req, false); 572 } else { 573 tail = 0; 574 } 575 576 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 577 int nbytes = walk.nbytes; 578 579 if (walk.nbytes < walk.total) 580 nbytes &= ~(AES_BLOCK_SIZE - 1); 581 582 kernel_neon_begin(); 583 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 584 ctx->key1.key_enc, rounds, nbytes, 585 ctx->key2.key_enc, walk.iv, first); 586 kernel_neon_end(); 587 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 588 } 589 590 if (err || likely(!tail)) 591 return err; 592 593 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 594 if (req->dst != req->src) 595 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 596 597 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 598 req->iv); 599 600 err = skcipher_walk_virt(&walk, &subreq, false); 601 if (err) 602 return err; 603 604 kernel_neon_begin(); 605 aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr, 606 ctx->key1.key_enc, rounds, walk.nbytes, 607 ctx->key2.key_enc, walk.iv, first); 608 kernel_neon_end(); 609 610 return skcipher_walk_done(&walk, 0); 611 } 612 613 static int __maybe_unused xts_decrypt(struct skcipher_request *req) 614 { 615 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); 616 struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm); 617 int err, first, rounds = 6 + ctx->key1.key_length / 4; 618 int tail = req->cryptlen % AES_BLOCK_SIZE; 619 struct scatterlist sg_src[2], sg_dst[2]; 620 struct skcipher_request subreq; 621 struct scatterlist *src, *dst; 622 struct skcipher_walk walk; 623 624 if (req->cryptlen < AES_BLOCK_SIZE) 625 return -EINVAL; 626 627 err = skcipher_walk_virt(&walk, req, false); 628 629 if (unlikely(tail > 0 && walk.nbytes < walk.total)) { 630 int xts_blocks = DIV_ROUND_UP(req->cryptlen, 631 AES_BLOCK_SIZE) - 2; 632 633 skcipher_walk_abort(&walk); 634 635 skcipher_request_set_tfm(&subreq, tfm); 636 skcipher_request_set_callback(&subreq, 637 skcipher_request_flags(req), 638 NULL, NULL); 639 skcipher_request_set_crypt(&subreq, req->src, req->dst, 640 xts_blocks * AES_BLOCK_SIZE, 641 req->iv); 642 req = &subreq; 643 err = skcipher_walk_virt(&walk, req, false); 644 } else { 645 tail = 0; 646 } 647 648 for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) { 649 int nbytes = walk.nbytes; 650 651 if (walk.nbytes < walk.total) 652 nbytes &= ~(AES_BLOCK_SIZE - 1); 653 654 kernel_neon_begin(); 655 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 656 ctx->key1.key_dec, rounds, nbytes, 657 ctx->key2.key_enc, walk.iv, first); 658 kernel_neon_end(); 659 err = skcipher_walk_done(&walk, walk.nbytes - nbytes); 660 } 661 662 if (err || likely(!tail)) 663 return err; 664 665 dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen); 666 if (req->dst != req->src) 667 dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen); 668 669 skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail, 670 req->iv); 671 672 err = skcipher_walk_virt(&walk, &subreq, false); 673 if (err) 674 return err; 675 676 677 kernel_neon_begin(); 678 aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr, 679 ctx->key1.key_dec, rounds, walk.nbytes, 680 ctx->key2.key_enc, walk.iv, first); 681 kernel_neon_end(); 682 683 return skcipher_walk_done(&walk, 0); 684 } 685 686 static struct skcipher_alg aes_algs[] = { { 687 #if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS) 688 .base = { 689 .cra_name = "ecb(aes)", 690 .cra_driver_name = "ecb-aes-" MODE, 691 .cra_priority = PRIO, 692 .cra_blocksize = AES_BLOCK_SIZE, 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 .setkey = skcipher_aes_setkey, 699 .encrypt = ecb_encrypt, 700 .decrypt = ecb_decrypt, 701 }, { 702 .base = { 703 .cra_name = "cbc(aes)", 704 .cra_driver_name = "cbc-aes-" MODE, 705 .cra_priority = PRIO, 706 .cra_blocksize = AES_BLOCK_SIZE, 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 .setkey = skcipher_aes_setkey, 714 .encrypt = cbc_encrypt, 715 .decrypt = cbc_decrypt, 716 }, { 717 .base = { 718 .cra_name = "ctr(aes)", 719 .cra_driver_name = "ctr-aes-" MODE, 720 .cra_priority = PRIO, 721 .cra_blocksize = 1, 722 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 723 .cra_module = THIS_MODULE, 724 }, 725 .min_keysize = AES_MIN_KEY_SIZE, 726 .max_keysize = AES_MAX_KEY_SIZE, 727 .ivsize = AES_BLOCK_SIZE, 728 .chunksize = AES_BLOCK_SIZE, 729 .setkey = skcipher_aes_setkey, 730 .encrypt = ctr_encrypt, 731 .decrypt = ctr_encrypt, 732 }, { 733 .base = { 734 .cra_name = "xctr(aes)", 735 .cra_driver_name = "xctr-aes-" MODE, 736 .cra_priority = PRIO, 737 .cra_blocksize = 1, 738 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 739 .cra_module = THIS_MODULE, 740 }, 741 .min_keysize = AES_MIN_KEY_SIZE, 742 .max_keysize = AES_MAX_KEY_SIZE, 743 .ivsize = AES_BLOCK_SIZE, 744 .chunksize = AES_BLOCK_SIZE, 745 .setkey = skcipher_aes_setkey, 746 .encrypt = xctr_encrypt, 747 .decrypt = xctr_encrypt, 748 }, { 749 .base = { 750 .cra_name = "xts(aes)", 751 .cra_driver_name = "xts-aes-" MODE, 752 .cra_priority = PRIO, 753 .cra_blocksize = AES_BLOCK_SIZE, 754 .cra_ctxsize = sizeof(struct crypto_aes_xts_ctx), 755 .cra_module = THIS_MODULE, 756 }, 757 .min_keysize = 2 * AES_MIN_KEY_SIZE, 758 .max_keysize = 2 * AES_MAX_KEY_SIZE, 759 .ivsize = AES_BLOCK_SIZE, 760 .walksize = 2 * AES_BLOCK_SIZE, 761 .setkey = xts_set_key, 762 .encrypt = xts_encrypt, 763 .decrypt = xts_decrypt, 764 }, { 765 #endif 766 .base = { 767 .cra_name = "cts(cbc(aes))", 768 .cra_driver_name = "cts-cbc-aes-" MODE, 769 .cra_priority = PRIO, 770 .cra_blocksize = AES_BLOCK_SIZE, 771 .cra_ctxsize = sizeof(struct crypto_aes_ctx), 772 .cra_module = THIS_MODULE, 773 }, 774 .min_keysize = AES_MIN_KEY_SIZE, 775 .max_keysize = AES_MAX_KEY_SIZE, 776 .ivsize = AES_BLOCK_SIZE, 777 .walksize = 2 * AES_BLOCK_SIZE, 778 .setkey = skcipher_aes_setkey, 779 .encrypt = cts_cbc_encrypt, 780 .decrypt = cts_cbc_decrypt, 781 }, { 782 .base = { 783 .cra_name = "essiv(cbc(aes),sha256)", 784 .cra_driver_name = "essiv-cbc-aes-sha256-" MODE, 785 .cra_priority = PRIO + 1, 786 .cra_blocksize = AES_BLOCK_SIZE, 787 .cra_ctxsize = sizeof(struct crypto_aes_essiv_cbc_ctx), 788 .cra_module = THIS_MODULE, 789 }, 790 .min_keysize = AES_MIN_KEY_SIZE, 791 .max_keysize = AES_MAX_KEY_SIZE, 792 .ivsize = AES_BLOCK_SIZE, 793 .setkey = essiv_cbc_set_key, 794 .encrypt = essiv_cbc_encrypt, 795 .decrypt = essiv_cbc_decrypt, 796 .init = essiv_cbc_init_tfm, 797 .exit = essiv_cbc_exit_tfm, 798 } }; 799 800 static int cbcmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 801 unsigned int key_len) 802 { 803 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 804 805 return aes_expandkey(&ctx->key, in_key, key_len); 806 } 807 808 static void cmac_gf128_mul_by_x(be128 *y, const be128 *x) 809 { 810 u64 a = be64_to_cpu(x->a); 811 u64 b = be64_to_cpu(x->b); 812 813 y->a = cpu_to_be64((a << 1) | (b >> 63)); 814 y->b = cpu_to_be64((b << 1) ^ ((a >> 63) ? 0x87 : 0)); 815 } 816 817 static int cmac_setkey(struct crypto_shash *tfm, const u8 *in_key, 818 unsigned int key_len) 819 { 820 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 821 be128 *consts = (be128 *)ctx->consts; 822 int rounds = 6 + key_len / 4; 823 int err; 824 825 err = cbcmac_setkey(tfm, in_key, key_len); 826 if (err) 827 return err; 828 829 /* encrypt the zero vector */ 830 kernel_neon_begin(); 831 aes_ecb_encrypt(ctx->consts, (u8[AES_BLOCK_SIZE]){}, ctx->key.key_enc, 832 rounds, 1); 833 kernel_neon_end(); 834 835 cmac_gf128_mul_by_x(consts, consts); 836 cmac_gf128_mul_by_x(consts + 1, consts); 837 838 return 0; 839 } 840 841 static int xcbc_setkey(struct crypto_shash *tfm, const u8 *in_key, 842 unsigned int key_len) 843 { 844 static u8 const ks[3][AES_BLOCK_SIZE] = { 845 { [0 ... AES_BLOCK_SIZE - 1] = 0x1 }, 846 { [0 ... AES_BLOCK_SIZE - 1] = 0x2 }, 847 { [0 ... AES_BLOCK_SIZE - 1] = 0x3 }, 848 }; 849 850 struct mac_tfm_ctx *ctx = crypto_shash_ctx(tfm); 851 int rounds = 6 + key_len / 4; 852 u8 key[AES_BLOCK_SIZE]; 853 int err; 854 855 err = cbcmac_setkey(tfm, in_key, key_len); 856 if (err) 857 return err; 858 859 kernel_neon_begin(); 860 aes_ecb_encrypt(key, ks[0], ctx->key.key_enc, rounds, 1); 861 aes_ecb_encrypt(ctx->consts, ks[1], ctx->key.key_enc, rounds, 2); 862 kernel_neon_end(); 863 864 return cbcmac_setkey(tfm, key, sizeof(key)); 865 } 866 867 static int mac_init(struct shash_desc *desc) 868 { 869 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 870 871 memset(ctx->dg, 0, AES_BLOCK_SIZE); 872 ctx->len = 0; 873 874 return 0; 875 } 876 877 static void mac_do_update(struct crypto_aes_ctx *ctx, u8 const in[], int blocks, 878 u8 dg[], int enc_before, int enc_after) 879 { 880 int rounds = 6 + ctx->key_length / 4; 881 882 if (crypto_simd_usable()) { 883 int rem; 884 885 do { 886 kernel_neon_begin(); 887 rem = aes_mac_update(in, ctx->key_enc, rounds, blocks, 888 dg, enc_before, enc_after); 889 kernel_neon_end(); 890 in += (blocks - rem) * AES_BLOCK_SIZE; 891 blocks = rem; 892 enc_before = 0; 893 } while (blocks); 894 } else { 895 if (enc_before) 896 aes_encrypt(ctx, dg, dg); 897 898 while (blocks--) { 899 crypto_xor(dg, in, AES_BLOCK_SIZE); 900 in += AES_BLOCK_SIZE; 901 902 if (blocks || enc_after) 903 aes_encrypt(ctx, dg, dg); 904 } 905 } 906 } 907 908 static int mac_update(struct shash_desc *desc, const u8 *p, unsigned int len) 909 { 910 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 911 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 912 913 while (len > 0) { 914 unsigned int l; 915 916 if ((ctx->len % AES_BLOCK_SIZE) == 0 && 917 (ctx->len + len) > AES_BLOCK_SIZE) { 918 919 int blocks = len / AES_BLOCK_SIZE; 920 921 len %= AES_BLOCK_SIZE; 922 923 mac_do_update(&tctx->key, p, blocks, ctx->dg, 924 (ctx->len != 0), (len != 0)); 925 926 p += blocks * AES_BLOCK_SIZE; 927 928 if (!len) { 929 ctx->len = AES_BLOCK_SIZE; 930 break; 931 } 932 ctx->len = 0; 933 } 934 935 l = min(len, AES_BLOCK_SIZE - ctx->len); 936 937 if (l <= AES_BLOCK_SIZE) { 938 crypto_xor(ctx->dg + ctx->len, p, l); 939 ctx->len += l; 940 len -= l; 941 p += l; 942 } 943 } 944 945 return 0; 946 } 947 948 static int cbcmac_final(struct shash_desc *desc, u8 *out) 949 { 950 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 951 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 952 953 mac_do_update(&tctx->key, NULL, 0, ctx->dg, (ctx->len != 0), 0); 954 955 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 956 957 return 0; 958 } 959 960 static int cmac_final(struct shash_desc *desc, u8 *out) 961 { 962 struct mac_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm); 963 struct mac_desc_ctx *ctx = shash_desc_ctx(desc); 964 u8 *consts = tctx->consts; 965 966 if (ctx->len != AES_BLOCK_SIZE) { 967 ctx->dg[ctx->len] ^= 0x80; 968 consts += AES_BLOCK_SIZE; 969 } 970 971 mac_do_update(&tctx->key, consts, 1, ctx->dg, 0, 1); 972 973 memcpy(out, ctx->dg, AES_BLOCK_SIZE); 974 975 return 0; 976 } 977 978 static struct shash_alg mac_algs[] = { { 979 .base.cra_name = "cmac(aes)", 980 .base.cra_driver_name = "cmac-aes-" MODE, 981 .base.cra_priority = PRIO, 982 .base.cra_blocksize = AES_BLOCK_SIZE, 983 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 984 2 * AES_BLOCK_SIZE, 985 .base.cra_module = THIS_MODULE, 986 987 .digestsize = AES_BLOCK_SIZE, 988 .init = mac_init, 989 .update = mac_update, 990 .final = cmac_final, 991 .setkey = cmac_setkey, 992 .descsize = sizeof(struct mac_desc_ctx), 993 }, { 994 .base.cra_name = "xcbc(aes)", 995 .base.cra_driver_name = "xcbc-aes-" MODE, 996 .base.cra_priority = PRIO, 997 .base.cra_blocksize = AES_BLOCK_SIZE, 998 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx) + 999 2 * AES_BLOCK_SIZE, 1000 .base.cra_module = THIS_MODULE, 1001 1002 .digestsize = AES_BLOCK_SIZE, 1003 .init = mac_init, 1004 .update = mac_update, 1005 .final = cmac_final, 1006 .setkey = xcbc_setkey, 1007 .descsize = sizeof(struct mac_desc_ctx), 1008 }, { 1009 .base.cra_name = "cbcmac(aes)", 1010 .base.cra_driver_name = "cbcmac-aes-" MODE, 1011 .base.cra_priority = PRIO, 1012 .base.cra_blocksize = 1, 1013 .base.cra_ctxsize = sizeof(struct mac_tfm_ctx), 1014 .base.cra_module = THIS_MODULE, 1015 1016 .digestsize = AES_BLOCK_SIZE, 1017 .init = mac_init, 1018 .update = mac_update, 1019 .final = cbcmac_final, 1020 .setkey = cbcmac_setkey, 1021 .descsize = sizeof(struct mac_desc_ctx), 1022 } }; 1023 1024 static void aes_exit(void) 1025 { 1026 crypto_unregister_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1027 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1028 } 1029 1030 static int __init aes_init(void) 1031 { 1032 int err; 1033 1034 err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1035 if (err) 1036 return err; 1037 1038 err = crypto_register_shashes(mac_algs, ARRAY_SIZE(mac_algs)); 1039 if (err) 1040 goto unregister_ciphers; 1041 1042 return 0; 1043 1044 unregister_ciphers: 1045 crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs)); 1046 return err; 1047 } 1048 1049 #ifdef USE_V8_CRYPTO_EXTENSIONS 1050 module_cpu_feature_match(AES, aes_init); 1051 EXPORT_SYMBOL_NS(ce_aes_mac_update, CRYPTO_INTERNAL); 1052 #else 1053 module_init(aes_init); 1054 EXPORT_SYMBOL(neon_aes_ecb_encrypt); 1055 EXPORT_SYMBOL(neon_aes_cbc_encrypt); 1056 EXPORT_SYMBOL(neon_aes_ctr_encrypt); 1057 EXPORT_SYMBOL(neon_aes_xts_encrypt); 1058 EXPORT_SYMBOL(neon_aes_xts_decrypt); 1059 #endif 1060 module_exit(aes_exit); 1061