nhpoly1305-neon-glue.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum
 4 * (ARM64 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/internal/simd.h>
13#include <crypto/nhpoly1305.h>
14#include <linux/module.h>
15
16asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len,
17			__le64 hash[NH_NUM_PASSES]);
18
19static int nhpoly1305_neon_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		scoped_ksimd()
29			crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
30		src += n;
31		srclen -= n;
32	} while (srclen);
33	return 0;
34}
35
36static int nhpoly1305_neon_digest(struct shash_desc *desc,
37				  const u8 *src, unsigned int srclen, u8 *out)
38{
39	return crypto_nhpoly1305_init(desc) ?:
40	       nhpoly1305_neon_update(desc, src, srclen) ?:
41	       crypto_nhpoly1305_final(desc, out);
42}
43
44static struct shash_alg nhpoly1305_alg = {
45	.base.cra_name		= "nhpoly1305",
46	.base.cra_driver_name	= "nhpoly1305-neon",
47	.base.cra_priority	= 200,
48	.base.cra_ctxsize	= sizeof(struct nhpoly1305_key),
49	.base.cra_module	= THIS_MODULE,
50	.digestsize		= POLY1305_DIGEST_SIZE,
51	.init			= crypto_nhpoly1305_init,
52	.update			= nhpoly1305_neon_update,
53	.final			= crypto_nhpoly1305_final,
54	.digest			= nhpoly1305_neon_digest,
55	.setkey			= crypto_nhpoly1305_setkey,
56	.descsize		= sizeof(struct nhpoly1305_state),
57};
58
59static int __init nhpoly1305_mod_init(void)
60{
61	if (!cpu_have_named_feature(ASIMD))
62		return -ENODEV;
63
64	return crypto_register_shash(&nhpoly1305_alg);
65}
66
67static void __exit nhpoly1305_mod_exit(void)
68{
69	crypto_unregister_shash(&nhpoly1305_alg);
70}
71
72module_init(nhpoly1305_mod_init);
73module_exit(nhpoly1305_mod_exit);
74
75MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)");
76MODULE_LICENSE("GPL v2");
77MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
78MODULE_ALIAS_CRYPTO("nhpoly1305");
79MODULE_ALIAS_CRYPTO("nhpoly1305-neon");