arch/arm64/crypto/ghash-ce-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Accelerated GHASH implementation with ARMv8 PMULL instructions.
   4  *
   5  * Copyright (C) 2014 - 2018 Linaro Ltd. <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <asm/neon.h>
   9 #include <asm/simd.h>
  10 #include <asm/unaligned.h>
  11 #include <crypto/aes.h>
  12 #include <crypto/algapi.h>
  13 #include <crypto/b128ops.h>
  14 #include <crypto/gf128mul.h>
  15 #include <crypto/internal/aead.h>
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/internal/simd.h>
  18 #include <crypto/internal/skcipher.h>
  19 #include <crypto/scatterwalk.h>
  20 #include <linux/cpufeature.h>
  21 #include <linux/crypto.h>
  22 #include <linux/module.h>
  23
  24 MODULE_DESCRIPTION("GHASH and AES-GCM using ARMv8 Crypto Extensions");
  25 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  26 MODULE_LICENSE("GPL v2");
  27 MODULE_ALIAS_CRYPTO("ghash");
  28
  29 #define GHASH_BLOCK_SIZE        16
  30 #define GHASH_DIGEST_SIZE       16
  31 #define GCM_IV_SIZE             12
  32
  33 struct ghash_key {
  34         u64                     h[2];
  35         u64                     h2[2];
  36         u64                     h3[2];
  37         u64                     h4[2];
  38
  39         be128                   k;
  40 };
  41
  42 struct ghash_desc_ctx {
  43         u64 digest[GHASH_DIGEST_SIZE/sizeof(u64)];
  44         u8 buf[GHASH_BLOCK_SIZE];
  45         u32 count;
  46 };
  47
  48 struct gcm_aes_ctx {
  49         struct crypto_aes_ctx   aes_key;
  50         struct ghash_key        ghash_key;
  51 };
  52
  53 asmlinkage void pmull_ghash_update_p64(int blocks, u64 dg[], const char *src,
  54                                        struct ghash_key const *k,
  55                                        const char *head);
  56
  57 asmlinkage void pmull_ghash_update_p8(int blocks, u64 dg[], const char *src,
  58                                       struct ghash_key const *k,
  59                                       const char *head);
  60
  61 asmlinkage void pmull_gcm_encrypt(int blocks, u64 dg[], u8 dst[],
  62                                   const u8 src[], struct ghash_key const *k,
  63                                   u8 ctr[], u32 const rk[], int rounds,
  64                                   u8 ks[]);
  65
  66 asmlinkage void pmull_gcm_decrypt(int blocks, u64 dg[], u8 dst[],
  67                                   const u8 src[], struct ghash_key const *k,
  68                                   u8 ctr[], u32 const rk[], int rounds);
  69
  70 asmlinkage void pmull_gcm_encrypt_block(u8 dst[], u8 const src[],
  71                                         u32 const rk[], int rounds);
  72
  73 asmlinkage void __aes_arm64_encrypt(u32 *rk, u8 *out, const u8 *in, int rounds);
  74
  75 static int ghash_init(struct shash_desc *desc)
  76 {
  77         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
  78
  79         *ctx = (struct ghash_desc_ctx){};
  80         return 0;
  81 }
  82
  83 static void ghash_do_update(int blocks, u64 dg[], const char *src,
  84                             struct ghash_key *key, const char *head,
  85                             void (*simd_update)(int blocks, u64 dg[],
  86                                                 const char *src,
  87                                                 struct ghash_key const *k,
  88                                                 const char *head))
  89 {
  90         if (likely(crypto_simd_usable())) {
  91                 kernel_neon_begin();
  92                 simd_update(blocks, dg, src, key, head);
  93                 kernel_neon_end();
  94         } else {
  95                 be128 dst = { cpu_to_be64(dg[1]), cpu_to_be64(dg[0]) };
  96
  97                 do {
  98                         const u8 *in = src;
  99
 100                         if (head) {
 101                                 in = head;
 102                                 blocks++;
 103                                 head = NULL;
 104                         } else {
 105                                 src += GHASH_BLOCK_SIZE;
 106                         }
 107
 108                         crypto_xor((u8 *)&dst, in, GHASH_BLOCK_SIZE);
 109                         gf128mul_lle(&dst, &key->k);
 110                 } while (--blocks);
 111
 112                 dg[0] = be64_to_cpu(dst.b);
 113                 dg[1] = be64_to_cpu(dst.a);
 114         }
 115 }
 116
 117 /* avoid hogging the CPU for too long */
 118 #define MAX_BLOCKS      (SZ_64K / GHASH_BLOCK_SIZE)
 119
 120 static int __ghash_update(struct shash_desc *desc, const u8 *src,
 121                           unsigned int len,
 122                           void (*simd_update)(int blocks, u64 dg[],
 123                                               const char *src,
 124                                               struct ghash_key const *k,
 125                                               const char *head))
 126 {
 127         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
 128         unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
 129
 130         ctx->count += len;
 131
 132         if ((partial + len) >= GHASH_BLOCK_SIZE) {
 133                 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
 134                 int blocks;
 135
 136                 if (partial) {
 137                         int p = GHASH_BLOCK_SIZE - partial;
 138
 139                         memcpy(ctx->buf + partial, src, p);
 140                         src += p;
 141                         len -= p;
 142                 }
 143
 144                 blocks = len / GHASH_BLOCK_SIZE;
 145                 len %= GHASH_BLOCK_SIZE;
 146
 147                 do {
 148                         int chunk = min(blocks, MAX_BLOCKS);
 149
 150                         ghash_do_update(chunk, ctx->digest, src, key,
 151                                         partial ? ctx->buf : NULL,
 152                                         simd_update);
 153
 154                         blocks -= chunk;
 155                         src += chunk * GHASH_BLOCK_SIZE;
 156                         partial = 0;
 157                 } while (unlikely(blocks > 0));
 158         }
 159         if (len)
 160                 memcpy(ctx->buf + partial, src, len);
 161         return 0;
 162 }
 163
 164 static int ghash_update_p8(struct shash_desc *desc, const u8 *src,
 165                            unsigned int len)
 166 {
 167         return __ghash_update(desc, src, len, pmull_ghash_update_p8);
 168 }
 169
 170 static int ghash_update_p64(struct shash_desc *desc, const u8 *src,
 171                             unsigned int len)
 172 {
 173         return __ghash_update(desc, src, len, pmull_ghash_update_p64);
 174 }
 175
 176 static int ghash_final_p8(struct shash_desc *desc, u8 *dst)
 177 {
 178         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
 179         unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
 180
 181         if (partial) {
 182                 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
 183
 184                 memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
 185
 186                 ghash_do_update(1, ctx->digest, ctx->buf, key, NULL,
 187                                 pmull_ghash_update_p8);
 188         }
 189         put_unaligned_be64(ctx->digest[1], dst);
 190         put_unaligned_be64(ctx->digest[0], dst + 8);
 191
 192         *ctx = (struct ghash_desc_ctx){};
 193         return 0;
 194 }
 195
 196 static int ghash_final_p64(struct shash_desc *desc, u8 *dst)
 197 {
 198         struct ghash_desc_ctx *ctx = shash_desc_ctx(desc);
 199         unsigned int partial = ctx->count % GHASH_BLOCK_SIZE;
 200
 201         if (partial) {
 202                 struct ghash_key *key = crypto_shash_ctx(desc->tfm);
 203
 204                 memset(ctx->buf + partial, 0, GHASH_BLOCK_SIZE - partial);
 205
 206                 ghash_do_update(1, ctx->digest, ctx->buf, key, NULL,
 207                                 pmull_ghash_update_p64);
 208         }
 209         put_unaligned_be64(ctx->digest[1], dst);
 210         put_unaligned_be64(ctx->digest[0], dst + 8);
 211
 212         *ctx = (struct ghash_desc_ctx){};
 213         return 0;
 214 }
 215
 216 static void ghash_reflect(u64 h[], const be128 *k)
 217 {
 218         u64 carry = be64_to_cpu(k->a) & BIT(63) ? 1 : 0;
 219
 220         h[0] = (be64_to_cpu(k->b) << 1) | carry;
 221         h[1] = (be64_to_cpu(k->a) << 1) | (be64_to_cpu(k->b) >> 63);
 222
 223         if (carry)
 224                 h[1] ^= 0xc200000000000000UL;
 225 }
 226
 227 static int __ghash_setkey(struct ghash_key *key,
 228                           const u8 *inkey, unsigned int keylen)
 229 {
 230         be128 h;
 231
 232         /* needed for the fallback */
 233         memcpy(&key->k, inkey, GHASH_BLOCK_SIZE);
 234
 235         ghash_reflect(key->h, &key->k);
 236
 237         h = key->k;
 238         gf128mul_lle(&h, &key->k);
 239         ghash_reflect(key->h2, &h);
 240
 241         gf128mul_lle(&h, &key->k);
 242         ghash_reflect(key->h3, &h);
 243
 244         gf128mul_lle(&h, &key->k);
 245         ghash_reflect(key->h4, &h);
 246
 247         return 0;
 248 }
 249
 250 static int ghash_setkey(struct crypto_shash *tfm,
 251                         const u8 *inkey, unsigned int keylen)
 252 {
 253         struct ghash_key *key = crypto_shash_ctx(tfm);
 254
 255         if (keylen != GHASH_BLOCK_SIZE) {
 256                 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 257                 return -EINVAL;
 258         }
 259
 260         return __ghash_setkey(key, inkey, keylen);
 261 }
 262
 263 static struct shash_alg ghash_alg[] = {{
 264         .base.cra_name          = "ghash",
 265         .base.cra_driver_name   = "ghash-neon",
 266         .base.cra_priority      = 100,
 267         .base.cra_blocksize     = GHASH_BLOCK_SIZE,
 268         .base.cra_ctxsize       = sizeof(struct ghash_key),
 269         .base.cra_module        = THIS_MODULE,
 270
 271         .digestsize             = GHASH_DIGEST_SIZE,
 272         .init                   = ghash_init,
 273         .update                 = ghash_update_p8,
 274         .final                  = ghash_final_p8,
 275         .setkey                 = ghash_setkey,
 276         .descsize               = sizeof(struct ghash_desc_ctx),
 277 }, {
 278         .base.cra_name          = "ghash",
 279         .base.cra_driver_name   = "ghash-ce",
 280         .base.cra_priority      = 200,
 281         .base.cra_blocksize     = GHASH_BLOCK_SIZE,
 282         .base.cra_ctxsize       = sizeof(struct ghash_key),
 283         .base.cra_module        = THIS_MODULE,
 284
 285         .digestsize             = GHASH_DIGEST_SIZE,
 286         .init                   = ghash_init,
 287         .update                 = ghash_update_p64,
 288         .final                  = ghash_final_p64,
 289         .setkey                 = ghash_setkey,
 290         .descsize               = sizeof(struct ghash_desc_ctx),
 291 }};
 292
 293 static int num_rounds(struct crypto_aes_ctx *ctx)
 294 {
 295         /*
 296          * # of rounds specified by AES:
 297          * 128 bit key          10 rounds
 298          * 192 bit key          12 rounds
 299          * 256 bit key          14 rounds
 300          * => n byte key        => 6 + (n/4) rounds
 301          */
 302         return 6 + ctx->key_length / 4;
 303 }
 304
 305 static int gcm_setkey(struct crypto_aead *tfm, const u8 *inkey,
 306                       unsigned int keylen)
 307 {
 308         struct gcm_aes_ctx *ctx = crypto_aead_ctx(tfm);
 309         u8 key[GHASH_BLOCK_SIZE];
 310         int ret;
 311
 312         ret = crypto_aes_expand_key(&ctx->aes_key, inkey, keylen);
 313         if (ret) {
 314                 tfm->base.crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 315                 return -EINVAL;
 316         }
 317
 318         __aes_arm64_encrypt(ctx->aes_key.key_enc, key, (u8[AES_BLOCK_SIZE]){},
 319                             num_rounds(&ctx->aes_key));
 320
 321         return __ghash_setkey(&ctx->ghash_key, key, sizeof(be128));
 322 }
 323
 324 static int gcm_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
 325 {
 326         switch (authsize) {
 327         case 4:
 328         case 8:
 329         case 12 ... 16:
 330                 break;
 331         default:
 332                 return -EINVAL;
 333         }
 334         return 0;
 335 }
 336
 337 static void gcm_update_mac(u64 dg[], const u8 *src, int count, u8 buf[],
 338                            int *buf_count, struct gcm_aes_ctx *ctx)
 339 {
 340         if (*buf_count > 0) {
 341                 int buf_added = min(count, GHASH_BLOCK_SIZE - *buf_count);
 342
 343                 memcpy(&buf[*buf_count], src, buf_added);
 344
 345                 *buf_count += buf_added;
 346                 src += buf_added;
 347                 count -= buf_added;
 348         }
 349
 350         if (count >= GHASH_BLOCK_SIZE || *buf_count == GHASH_BLOCK_SIZE) {
 351                 int blocks = count / GHASH_BLOCK_SIZE;
 352
 353                 ghash_do_update(blocks, dg, src, &ctx->ghash_key,
 354                                 *buf_count ? buf : NULL,
 355                                 pmull_ghash_update_p64);
 356
 357                 src += blocks * GHASH_BLOCK_SIZE;
 358                 count %= GHASH_BLOCK_SIZE;
 359                 *buf_count = 0;
 360         }
 361
 362         if (count > 0) {
 363                 memcpy(buf, src, count);
 364                 *buf_count = count;
 365         }
 366 }
 367
 368 static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[])
 369 {
 370         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 371         struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
 372         u8 buf[GHASH_BLOCK_SIZE];
 373         struct scatter_walk walk;
 374         u32 len = req->assoclen;
 375         int buf_count = 0;
 376
 377         scatterwalk_start(&walk, req->src);
 378
 379         do {
 380                 u32 n = scatterwalk_clamp(&walk, len);
 381                 u8 *p;
 382
 383                 if (!n) {
 384                         scatterwalk_start(&walk, sg_next(walk.sg));
 385                         n = scatterwalk_clamp(&walk, len);
 386                 }
 387                 p = scatterwalk_map(&walk);
 388
 389                 gcm_update_mac(dg, p, n, buf, &buf_count, ctx);
 390                 len -= n;
 391
 392                 scatterwalk_unmap(p);
 393                 scatterwalk_advance(&walk, n);
 394                 scatterwalk_done(&walk, 0, len);
 395         } while (len);
 396
 397         if (buf_count) {
 398                 memset(&buf[buf_count], 0, GHASH_BLOCK_SIZE - buf_count);
 399                 ghash_do_update(1, dg, buf, &ctx->ghash_key, NULL,
 400                                 pmull_ghash_update_p64);
 401         }
 402 }
 403
 404 static void gcm_final(struct aead_request *req, struct gcm_aes_ctx *ctx,
 405                       u64 dg[], u8 tag[], int cryptlen)
 406 {
 407         u8 mac[AES_BLOCK_SIZE];
 408         u128 lengths;
 409
 410         lengths.a = cpu_to_be64(req->assoclen * 8);
 411         lengths.b = cpu_to_be64(cryptlen * 8);
 412
 413         ghash_do_update(1, dg, (void *)&lengths, &ctx->ghash_key, NULL,
 414                         pmull_ghash_update_p64);
 415
 416         put_unaligned_be64(dg[1], mac);
 417         put_unaligned_be64(dg[0], mac + 8);
 418
 419         crypto_xor(tag, mac, AES_BLOCK_SIZE);
 420 }
 421
 422 static int gcm_encrypt(struct aead_request *req)
 423 {
 424         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 425         struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
 426         struct skcipher_walk walk;
 427         u8 iv[AES_BLOCK_SIZE];
 428         u8 ks[2 * AES_BLOCK_SIZE];
 429         u8 tag[AES_BLOCK_SIZE];
 430         u64 dg[2] = {};
 431         int nrounds = num_rounds(&ctx->aes_key);
 432         int err;
 433
 434         if (req->assoclen)
 435                 gcm_calculate_auth_mac(req, dg);
 436
 437         memcpy(iv, req->iv, GCM_IV_SIZE);
 438         put_unaligned_be32(1, iv + GCM_IV_SIZE);
 439
 440         err = skcipher_walk_aead_encrypt(&walk, req, false);
 441
 442         if (likely(crypto_simd_usable() && walk.total >= 2 * AES_BLOCK_SIZE)) {
 443                 u32 const *rk = NULL;
 444
 445                 kernel_neon_begin();
 446                 pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc, nrounds);
 447                 put_unaligned_be32(2, iv + GCM_IV_SIZE);
 448                 pmull_gcm_encrypt_block(ks, iv, NULL, nrounds);
 449                 put_unaligned_be32(3, iv + GCM_IV_SIZE);
 450                 pmull_gcm_encrypt_block(ks + AES_BLOCK_SIZE, iv, NULL, nrounds);
 451                 put_unaligned_be32(4, iv + GCM_IV_SIZE);
 452
 453                 do {
 454                         int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
 455
 456                         if (rk)
 457                                 kernel_neon_begin();
 458
 459                         pmull_gcm_encrypt(blocks, dg, walk.dst.virt.addr,
 460                                           walk.src.virt.addr, &ctx->ghash_key,
 461                                           iv, rk, nrounds, ks);
 462                         kernel_neon_end();
 463
 464                         err = skcipher_walk_done(&walk,
 465                                         walk.nbytes % (2 * AES_BLOCK_SIZE));
 466
 467                         rk = ctx->aes_key.key_enc;
 468                 } while (walk.nbytes >= 2 * AES_BLOCK_SIZE);
 469         } else {
 470                 __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv, nrounds);
 471                 put_unaligned_be32(2, iv + GCM_IV_SIZE);
 472
 473                 while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
 474                         const int blocks =
 475                                 walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
 476                         u8 *dst = walk.dst.virt.addr;
 477                         u8 *src = walk.src.virt.addr;
 478                         int remaining = blocks;
 479
 480                         do {
 481                                 __aes_arm64_encrypt(ctx->aes_key.key_enc,
 482                                                     ks, iv, nrounds);
 483                                 crypto_xor_cpy(dst, src, ks, AES_BLOCK_SIZE);
 484                                 crypto_inc(iv, AES_BLOCK_SIZE);
 485
 486                                 dst += AES_BLOCK_SIZE;
 487                                 src += AES_BLOCK_SIZE;
 488                         } while (--remaining > 0);
 489
 490                         ghash_do_update(blocks, dg,
 491                                         walk.dst.virt.addr, &ctx->ghash_key,
 492                                         NULL, pmull_ghash_update_p64);
 493
 494                         err = skcipher_walk_done(&walk,
 495                                                  walk.nbytes % (2 * AES_BLOCK_SIZE));
 496                 }
 497                 if (walk.nbytes) {
 498                         __aes_arm64_encrypt(ctx->aes_key.key_enc, ks, iv,
 499                                             nrounds);
 500                         if (walk.nbytes > AES_BLOCK_SIZE) {
 501                                 crypto_inc(iv, AES_BLOCK_SIZE);
 502                                 __aes_arm64_encrypt(ctx->aes_key.key_enc,
 503                                                     ks + AES_BLOCK_SIZE, iv,
 504                                                     nrounds);
 505                         }
 506                 }
 507         }
 508
 509         /* handle the tail */
 510         if (walk.nbytes) {
 511                 u8 buf[GHASH_BLOCK_SIZE];
 512                 unsigned int nbytes = walk.nbytes;
 513                 u8 *dst = walk.dst.virt.addr;
 514                 u8 *head = NULL;
 515
 516                 crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, ks,
 517                                walk.nbytes);
 518
 519                 if (walk.nbytes > GHASH_BLOCK_SIZE) {
 520                         head = dst;
 521                         dst += GHASH_BLOCK_SIZE;
 522                         nbytes %= GHASH_BLOCK_SIZE;
 523                 }
 524
 525                 memcpy(buf, dst, nbytes);
 526                 memset(buf + nbytes, 0, GHASH_BLOCK_SIZE - nbytes);
 527                 ghash_do_update(!!nbytes, dg, buf, &ctx->ghash_key, head,
 528                                 pmull_ghash_update_p64);
 529
 530                 err = skcipher_walk_done(&walk, 0);
 531         }
 532
 533         if (err)
 534                 return err;
 535
 536         gcm_final(req, ctx, dg, tag, req->cryptlen);
 537
 538         /* copy authtag to end of dst */
 539         scatterwalk_map_and_copy(tag, req->dst, req->assoclen + req->cryptlen,
 540                                  crypto_aead_authsize(aead), 1);
 541
 542         return 0;
 543 }
 544
 545 static int gcm_decrypt(struct aead_request *req)
 546 {
 547         struct crypto_aead *aead = crypto_aead_reqtfm(req);
 548         struct gcm_aes_ctx *ctx = crypto_aead_ctx(aead);
 549         unsigned int authsize = crypto_aead_authsize(aead);
 550         struct skcipher_walk walk;
 551         u8 iv[2 * AES_BLOCK_SIZE];
 552         u8 tag[AES_BLOCK_SIZE];
 553         u8 buf[2 * GHASH_BLOCK_SIZE];
 554         u64 dg[2] = {};
 555         int nrounds = num_rounds(&ctx->aes_key);
 556         int err;
 557
 558         if (req->assoclen)
 559                 gcm_calculate_auth_mac(req, dg);
 560
 561         memcpy(iv, req->iv, GCM_IV_SIZE);
 562         put_unaligned_be32(1, iv + GCM_IV_SIZE);
 563
 564         err = skcipher_walk_aead_decrypt(&walk, req, false);
 565
 566         if (likely(crypto_simd_usable() && walk.total >= 2 * AES_BLOCK_SIZE)) {
 567                 u32 const *rk = NULL;
 568
 569                 kernel_neon_begin();
 570                 pmull_gcm_encrypt_block(tag, iv, ctx->aes_key.key_enc, nrounds);
 571                 put_unaligned_be32(2, iv + GCM_IV_SIZE);
 572
 573                 do {
 574                         int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
 575                         int rem = walk.total - blocks * AES_BLOCK_SIZE;
 576
 577                         if (rk)
 578                                 kernel_neon_begin();
 579
 580                         pmull_gcm_decrypt(blocks, dg, walk.dst.virt.addr,
 581                                           walk.src.virt.addr, &ctx->ghash_key,
 582                                           iv, rk, nrounds);
 583
 584                         /* check if this is the final iteration of the loop */
 585                         if (rem < (2 * AES_BLOCK_SIZE)) {
 586                                 u8 *iv2 = iv + AES_BLOCK_SIZE;
 587
 588                                 if (rem > AES_BLOCK_SIZE) {
 589                                         memcpy(iv2, iv, AES_BLOCK_SIZE);
 590                                         crypto_inc(iv2, AES_BLOCK_SIZE);
 591                                 }
 592
 593                                 pmull_gcm_encrypt_block(iv, iv, NULL, nrounds);
 594
 595                                 if (rem > AES_BLOCK_SIZE)
 596                                         pmull_gcm_encrypt_block(iv2, iv2, NULL,
 597                                                                 nrounds);
 598                         }
 599
 600                         kernel_neon_end();
 601
 602                         err = skcipher_walk_done(&walk,
 603                                         walk.nbytes % (2 * AES_BLOCK_SIZE));
 604
 605                         rk = ctx->aes_key.key_enc;
 606                 } while (walk.nbytes >= 2 * AES_BLOCK_SIZE);
 607         } else {
 608                 __aes_arm64_encrypt(ctx->aes_key.key_enc, tag, iv, nrounds);
 609                 put_unaligned_be32(2, iv + GCM_IV_SIZE);
 610
 611                 while (walk.nbytes >= (2 * AES_BLOCK_SIZE)) {
 612                         int blocks = walk.nbytes / (2 * AES_BLOCK_SIZE) * 2;
 613                         u8 *dst = walk.dst.virt.addr;
 614                         u8 *src = walk.src.virt.addr;
 615
 616                         ghash_do_update(blocks, dg, walk.src.virt.addr,
 617                                         &ctx->ghash_key, NULL,
 618                                         pmull_ghash_update_p64);
 619
 620                         do {
 621                                 __aes_arm64_encrypt(ctx->aes_key.key_enc,
 622                                                     buf, iv, nrounds);
 623                                 crypto_xor_cpy(dst, src, buf, AES_BLOCK_SIZE);
 624                                 crypto_inc(iv, AES_BLOCK_SIZE);
 625
 626                                 dst += AES_BLOCK_SIZE;
 627                                 src += AES_BLOCK_SIZE;
 628                         } while (--blocks > 0);
 629
 630                         err = skcipher_walk_done(&walk,
 631                                                  walk.nbytes % (2 * AES_BLOCK_SIZE));
 632                 }
 633                 if (walk.nbytes) {
 634                         if (walk.nbytes > AES_BLOCK_SIZE) {
 635                                 u8 *iv2 = iv + AES_BLOCK_SIZE;
 636
 637                                 memcpy(iv2, iv, AES_BLOCK_SIZE);
 638                                 crypto_inc(iv2, AES_BLOCK_SIZE);
 639
 640                                 __aes_arm64_encrypt(ctx->aes_key.key_enc, iv2,
 641                                                     iv2, nrounds);
 642                         }
 643                         __aes_arm64_encrypt(ctx->aes_key.key_enc, iv, iv,
 644                                             nrounds);
 645                 }
 646         }
 647
 648         /* handle the tail */
 649         if (walk.nbytes) {
 650                 const u8 *src = walk.src.virt.addr;
 651                 const u8 *head = NULL;
 652                 unsigned int nbytes = walk.nbytes;
 653
 654                 if (walk.nbytes > GHASH_BLOCK_SIZE) {
 655                         head = src;
 656                         src += GHASH_BLOCK_SIZE;
 657                         nbytes %= GHASH_BLOCK_SIZE;
 658                 }
 659
 660                 memcpy(buf, src, nbytes);
 661                 memset(buf + nbytes, 0, GHASH_BLOCK_SIZE - nbytes);
 662                 ghash_do_update(!!nbytes, dg, buf, &ctx->ghash_key, head,
 663                                 pmull_ghash_update_p64);
 664
 665                 crypto_xor_cpy(walk.dst.virt.addr, walk.src.virt.addr, iv,
 666                                walk.nbytes);
 667
 668                 err = skcipher_walk_done(&walk, 0);
 669         }
 670
 671         if (err)
 672                 return err;
 673
 674         gcm_final(req, ctx, dg, tag, req->cryptlen - authsize);
 675
 676         /* compare calculated auth tag with the stored one */
 677         scatterwalk_map_and_copy(buf, req->src,
 678                                  req->assoclen + req->cryptlen - authsize,
 679                                  authsize, 0);
 680
 681         if (crypto_memneq(tag, buf, authsize))
 682                 return -EBADMSG;
 683         return 0;
 684 }
 685
 686 static struct aead_alg gcm_aes_alg = {
 687         .ivsize                 = GCM_IV_SIZE,
 688         .chunksize              = 2 * AES_BLOCK_SIZE,
 689         .maxauthsize            = AES_BLOCK_SIZE,
 690         .setkey                 = gcm_setkey,
 691         .setauthsize            = gcm_setauthsize,
 692         .encrypt                = gcm_encrypt,
 693         .decrypt                = gcm_decrypt,
 694
 695         .base.cra_name          = "gcm(aes)",
 696         .base.cra_driver_name   = "gcm-aes-ce",
 697         .base.cra_priority      = 300,
 698         .base.cra_blocksize     = 1,
 699         .base.cra_ctxsize       = sizeof(struct gcm_aes_ctx),
 700         .base.cra_module        = THIS_MODULE,
 701 };
 702
 703 static int __init ghash_ce_mod_init(void)
 704 {
 705         int ret;
 706
 707         if (!cpu_have_named_feature(ASIMD))
 708                 return -ENODEV;
 709
 710         if (cpu_have_named_feature(PMULL))
 711                 ret = crypto_register_shashes(ghash_alg,
 712                                               ARRAY_SIZE(ghash_alg));
 713         else
 714                 /* only register the first array element */
 715                 ret = crypto_register_shash(ghash_alg);
 716
 717         if (ret)
 718                 return ret;
 719
 720         if (cpu_have_named_feature(PMULL)) {
 721                 ret = crypto_register_aead(&gcm_aes_alg);
 722                 if (ret)
 723                         crypto_unregister_shashes(ghash_alg,
 724                                                   ARRAY_SIZE(ghash_alg));
 725         }
 726         return ret;
 727 }
 728
 729 static void __exit ghash_ce_mod_exit(void)
 730 {
 731         if (cpu_have_named_feature(PMULL))
 732                 crypto_unregister_shashes(ghash_alg, ARRAY_SIZE(ghash_alg));
 733         else
 734                 crypto_unregister_shash(ghash_alg);
 735         crypto_unregister_aead(&gcm_aes_alg);
 736 }
 737
 738 static const struct cpu_feature ghash_cpu_feature[] = {
 739         { cpu_feature(PMULL) }, { }
 740 };
 741 MODULE_DEVICE_TABLE(cpu, ghash_cpu_feature);
 742
 743 module_init(ghash_ce_mod_init);
 744 module_exit(ghash_ce_mod_exit);