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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> | |
99680c5e | 12 | #include <crypto/internal/simd.h> |
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13 | #include <crypto/nhpoly1305.h> |
14 | #include <linux/module.h> | |
15 | ||
16 | asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len, | |
cc7acaad | 17 | __le64 hash[NH_NUM_PASSES]); |
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18 | |
19 | static int nhpoly1305_neon_update(struct shash_desc *desc, | |
20 | const u8 *src, unsigned int srclen) | |
21 | { | |
99680c5e | 22 | if (srclen < 64 || !crypto_simd_usable()) |
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23 | return crypto_nhpoly1305_update(desc, src, srclen); |
24 | ||
25 | do { | |
a9a8ba90 | 26 | unsigned int n = min_t(unsigned int, srclen, SZ_4K); |
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27 | |
28 | kernel_neon_begin(); | |
cc7acaad | 29 | crypto_nhpoly1305_update_helper(desc, src, n, nh_neon); |
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30 | kernel_neon_end(); |
31 | src += n; | |
32 | srclen -= n; | |
33 | } while (srclen); | |
34 | return 0; | |
35 | } | |
36 | ||
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37 | static int nhpoly1305_neon_digest(struct shash_desc *desc, |
38 | const u8 *src, unsigned int srclen, u8 *out) | |
39 | { | |
40 | return crypto_nhpoly1305_init(desc) ?: | |
41 | nhpoly1305_neon_update(desc, src, srclen) ?: | |
42 | crypto_nhpoly1305_final(desc, out); | |
43 | } | |
44 | ||
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45 | static struct shash_alg nhpoly1305_alg = { |
46 | .base.cra_name = "nhpoly1305", | |
47 | .base.cra_driver_name = "nhpoly1305-neon", | |
48 | .base.cra_priority = 200, | |
49 | .base.cra_ctxsize = sizeof(struct nhpoly1305_key), | |
50 | .base.cra_module = THIS_MODULE, | |
51 | .digestsize = POLY1305_DIGEST_SIZE, | |
52 | .init = crypto_nhpoly1305_init, | |
53 | .update = nhpoly1305_neon_update, | |
54 | .final = crypto_nhpoly1305_final, | |
5f929b4e | 55 | .digest = nhpoly1305_neon_digest, |
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56 | .setkey = crypto_nhpoly1305_setkey, |
57 | .descsize = sizeof(struct nhpoly1305_state), | |
58 | }; | |
59 | ||
60 | static int __init nhpoly1305_mod_init(void) | |
61 | { | |
62 | if (!(elf_hwcap & HWCAP_NEON)) | |
63 | return -ENODEV; | |
64 | ||
65 | return crypto_register_shash(&nhpoly1305_alg); | |
66 | } | |
67 | ||
68 | static void __exit nhpoly1305_mod_exit(void) | |
69 | { | |
70 | crypto_unregister_shash(&nhpoly1305_alg); | |
71 | } | |
72 | ||
73 | module_init(nhpoly1305_mod_init); | |
74 | module_exit(nhpoly1305_mod_exit); | |
75 | ||
76 | MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)"); | |
77 | MODULE_LICENSE("GPL v2"); | |
78 | MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); | |
79 | MODULE_ALIAS_CRYPTO("nhpoly1305"); | |
80 | MODULE_ALIAS_CRYPTO("nhpoly1305-neon"); |