xref: /linux/arch/arm/crypto/nhpoly1305-neon-glue.c (revision 6b93f350e55f3f2ee071dd41109d936abfba8ebf)
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/internal/simd.h>
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,
17 			__le64 hash[NH_NUM_PASSES]);
18 
19 static 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 		kernel_neon_begin();
29 		crypto_nhpoly1305_update_helper(desc, src, n, nh_neon);
30 		kernel_neon_end();
31 		src += n;
32 		srclen -= n;
33 	} while (srclen);
34 	return 0;
35 }
36 
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 
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,
55 	.digest			= nhpoly1305_neon_digest,
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");
81