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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum | |
4 | * (AVX2 accelerated version) | |
5 | * | |
6 | * Copyright 2018 Google LLC | |
7 | */ | |
8 | ||
9 | #include <crypto/internal/hash.h> | |
f2abe0d7 | 10 | #include <crypto/internal/simd.h> |
0f961f9f EB |
11 | #include <crypto/nhpoly1305.h> |
12 | #include <linux/module.h> | |
0c3dc787 | 13 | #include <linux/sizes.h> |
f2abe0d7 | 14 | #include <asm/simd.h> |
0f961f9f EB |
15 | |
16 | asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len, | |
0f8bc4bd | 17 | __le64 hash[NH_NUM_PASSES]); |
0f961f9f EB |
18 | |
19 | static int nhpoly1305_avx2_update(struct shash_desc *desc, | |
20 | const u8 *src, unsigned int srclen) | |
21 | { | |
f2abe0d7 | 22 | if (srclen < 64 || !crypto_simd_usable()) |
0f961f9f EB |
23 | return crypto_nhpoly1305_update(desc, src, srclen); |
24 | ||
25 | do { | |
a9a8ba90 | 26 | unsigned int n = min_t(unsigned int, srclen, SZ_4K); |
0f961f9f EB |
27 | |
28 | kernel_fpu_begin(); | |
0f8bc4bd | 29 | crypto_nhpoly1305_update_helper(desc, src, n, nh_avx2); |
0f961f9f EB |
30 | kernel_fpu_end(); |
31 | src += n; | |
32 | srclen -= n; | |
33 | } while (srclen); | |
34 | return 0; | |
35 | } | |
36 | ||
37 | static struct shash_alg nhpoly1305_alg = { | |
38 | .base.cra_name = "nhpoly1305", | |
39 | .base.cra_driver_name = "nhpoly1305-avx2", | |
40 | .base.cra_priority = 300, | |
41 | .base.cra_ctxsize = sizeof(struct nhpoly1305_key), | |
42 | .base.cra_module = THIS_MODULE, | |
43 | .digestsize = POLY1305_DIGEST_SIZE, | |
44 | .init = crypto_nhpoly1305_init, | |
45 | .update = nhpoly1305_avx2_update, | |
46 | .final = crypto_nhpoly1305_final, | |
47 | .setkey = crypto_nhpoly1305_setkey, | |
48 | .descsize = sizeof(struct nhpoly1305_state), | |
49 | }; | |
50 | ||
51 | static int __init nhpoly1305_mod_init(void) | |
52 | { | |
53 | if (!boot_cpu_has(X86_FEATURE_AVX2) || | |
54 | !boot_cpu_has(X86_FEATURE_OSXSAVE)) | |
55 | return -ENODEV; | |
56 | ||
57 | return crypto_register_shash(&nhpoly1305_alg); | |
58 | } | |
59 | ||
60 | static void __exit nhpoly1305_mod_exit(void) | |
61 | { | |
62 | crypto_unregister_shash(&nhpoly1305_alg); | |
63 | } | |
64 | ||
65 | module_init(nhpoly1305_mod_init); | |
66 | module_exit(nhpoly1305_mod_exit); | |
67 | ||
68 | MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (AVX2-accelerated)"); | |
69 | MODULE_LICENSE("GPL v2"); | |
70 | MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); | |
71 | MODULE_ALIAS_CRYPTO("nhpoly1305"); | |
72 | MODULE_ALIAS_CRYPTO("nhpoly1305-avx2"); |