1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NHPoly1305 - ��-almost-���-universal hash function for Adiantum
4 * (AVX2 accelerated version)
5 *
6 * Copyright 2018 Google LLC
7 */
8
9#include <crypto/internal/hash.h>
10#include <crypto/internal/simd.h>
11#include <crypto/nhpoly1305.h>
12#include <linux/module.h>
13#include <linux/sizes.h>
14#include <asm/simd.h>
15
16asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len,
17			__le64 hash[NH_NUM_PASSES]);
18
19static int nhpoly1305_avx2_update(struct shash_desc *desc,
20				  const u8 *src, unsigned int srclen)
21{
22	if (srclen < 64 || !crypto_simd_usable())
23		return crypto_nhpoly1305_update(desc, src, srclen);
24
25	do {
26		unsigned int n = min_t(unsigned int, srclen, SZ_4K);
27
28		kernel_fpu_begin();
29		crypto_nhpoly1305_update_helper(desc, src, n, nh_avx2);
30		kernel_fpu_end();
31		src += n;
32		srclen -= n;
33	} while (srclen);
34	return 0;
35}
36
37static int nhpoly1305_avx2_digest(struct shash_desc *desc,
38				  const u8 *src, unsigned int srclen, u8 *out)
39{
40	return crypto_nhpoly1305_init(desc) ?:
41	       nhpoly1305_avx2_update(desc, src, srclen) ?:
42	       crypto_nhpoly1305_final(desc, out);
43}
44
45static struct shash_alg nhpoly1305_alg = {
46	.base.cra_name		= "nhpoly1305",
47	.base.cra_driver_name	= "nhpoly1305-avx2",
48	.base.cra_priority	= 300,
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_avx2_update,
54	.final			= crypto_nhpoly1305_final,
55	.digest			= nhpoly1305_avx2_digest,
56	.setkey			= crypto_nhpoly1305_setkey,
57	.descsize		= sizeof(struct nhpoly1305_state),
58};
59
60static int __init nhpoly1305_mod_init(void)
61{
62	if (!boot_cpu_has(X86_FEATURE_AVX2) ||
63	    !boot_cpu_has(X86_FEATURE_OSXSAVE))
64		return -ENODEV;
65
66	return crypto_register_shash(&nhpoly1305_alg);
67}
68
69static void __exit nhpoly1305_mod_exit(void)
70{
71	crypto_unregister_shash(&nhpoly1305_alg);
72}
73
74module_init(nhpoly1305_mod_init);
75module_exit(nhpoly1305_mod_exit);
76
77MODULE_DESCRIPTION("NHPoly1305 ��-almost-���-universal hash function (AVX2-accelerated)");
78MODULE_LICENSE("GPL v2");
79MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
80MODULE_ALIAS_CRYPTO("nhpoly1305");
81MODULE_ALIAS_CRYPTO("nhpoly1305-avx2");
82