Eric Biggers | f2daee4 | 2018-11-16 17:26:30 -0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum |
| 4 | * (NEON accelerated version) |
| 5 | * |
| 6 | * Copyright 2018 Google LLC |
| 7 | */ |
| 8 | |
| 9 | #include <asm/neon.h> |
| 10 | #include <asm/simd.h> |
| 11 | #include <crypto/internal/hash.h> |
| 12 | #include <crypto/nhpoly1305.h> |
| 13 | #include <linux/module.h> |
| 14 | |
| 15 | asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len, |
| 16 | u8 hash[NH_HASH_BYTES]); |
| 17 | |
| 18 | /* wrapper to avoid indirect call to assembly, which doesn't work with CFI */ |
| 19 | static void _nh_neon(const u32 *key, const u8 *message, size_t message_len, |
| 20 | __le64 hash[NH_NUM_PASSES]) |
| 21 | { |
| 22 | nh_neon(key, message, message_len, (u8 *)hash); |
| 23 | } |
| 24 | |
| 25 | static int nhpoly1305_neon_update(struct shash_desc *desc, |
| 26 | const u8 *src, unsigned int srclen) |
| 27 | { |
| 28 | if (srclen < 64 || !may_use_simd()) |
| 29 | return crypto_nhpoly1305_update(desc, src, srclen); |
| 30 | |
| 31 | do { |
| 32 | unsigned int n = min_t(unsigned int, srclen, PAGE_SIZE); |
| 33 | |
| 34 | kernel_neon_begin(); |
| 35 | crypto_nhpoly1305_update_helper(desc, src, n, _nh_neon); |
| 36 | kernel_neon_end(); |
| 37 | src += n; |
| 38 | srclen -= n; |
| 39 | } while (srclen); |
| 40 | return 0; |
| 41 | } |
| 42 | |
| 43 | static struct shash_alg nhpoly1305_alg = { |
| 44 | .base.cra_name = "nhpoly1305", |
| 45 | .base.cra_driver_name = "nhpoly1305-neon", |
| 46 | .base.cra_priority = 200, |
| 47 | .base.cra_ctxsize = sizeof(struct nhpoly1305_key), |
| 48 | .base.cra_module = THIS_MODULE, |
| 49 | .digestsize = POLY1305_DIGEST_SIZE, |
| 50 | .init = crypto_nhpoly1305_init, |
| 51 | .update = nhpoly1305_neon_update, |
| 52 | .final = crypto_nhpoly1305_final, |
| 53 | .setkey = crypto_nhpoly1305_setkey, |
| 54 | .descsize = sizeof(struct nhpoly1305_state), |
| 55 | }; |
| 56 | |
| 57 | static int __init nhpoly1305_mod_init(void) |
| 58 | { |
| 59 | if (!(elf_hwcap & HWCAP_NEON)) |
| 60 | return -ENODEV; |
| 61 | |
| 62 | return crypto_register_shash(&nhpoly1305_alg); |
| 63 | } |
| 64 | |
| 65 | static void __exit nhpoly1305_mod_exit(void) |
| 66 | { |
| 67 | crypto_unregister_shash(&nhpoly1305_alg); |
| 68 | } |
| 69 | |
| 70 | module_init(nhpoly1305_mod_init); |
| 71 | module_exit(nhpoly1305_mod_exit); |
| 72 | |
| 73 | MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)"); |
| 74 | MODULE_LICENSE("GPL v2"); |
| 75 | MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); |
| 76 | MODULE_ALIAS_CRYPTO("nhpoly1305"); |
| 77 | MODULE_ALIAS_CRYPTO("nhpoly1305-neon"); |