1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * BLAKE2b digest algorithm, NEON accelerated
4 *
5 * Copyright 2020 Google LLC
6 */
7
8#include <crypto/internal/blake2b.h>
9#include <crypto/internal/hash.h>
10#include <crypto/internal/simd.h>
11
12#include <linux/module.h>
13#include <linux/sizes.h>
14
15#include <asm/neon.h>
16#include <asm/simd.h>
17
18asmlinkage void blake2b_compress_neon(struct blake2b_state *state,
19				      const u8 *block, size_t nblocks, u32 inc);
20
21static void blake2b_compress_arch(struct blake2b_state *state,
22				  const u8 *block, size_t nblocks, u32 inc)
23{
24	if (!crypto_simd_usable()) {
25		blake2b_compress_generic(state, block, nblocks, inc);
26		return;
27	}
28
29	do {
30		const size_t blocks = min_t(size_t, nblocks,
31					    SZ_4K / BLAKE2B_BLOCK_SIZE);
32
33		kernel_neon_begin();
34		blake2b_compress_neon(state, block, blocks, inc);
35		kernel_neon_end();
36
37		nblocks -= blocks;
38		block += blocks * BLAKE2B_BLOCK_SIZE;
39	} while (nblocks);
40}
41
42static int crypto_blake2b_update_neon(struct shash_desc *desc,
43				      const u8 *in, unsigned int inlen)
44{
45	return crypto_blake2b_update(desc, in, inlen, blake2b_compress_arch);
46}
47
48static int crypto_blake2b_final_neon(struct shash_desc *desc, u8 *out)
49{
50	return crypto_blake2b_final(desc, out, blake2b_compress_arch);
51}
52
53#define BLAKE2B_ALG(name, driver_name, digest_size)			\
54	{								\
55		.base.cra_name		= name,				\
56		.base.cra_driver_name	= driver_name,			\
57		.base.cra_priority	= 200,				\
58		.base.cra_flags		= CRYPTO_ALG_OPTIONAL_KEY,	\
59		.base.cra_blocksize	= BLAKE2B_BLOCK_SIZE,		\
60		.base.cra_ctxsize	= sizeof(struct blake2b_tfm_ctx), \
61		.base.cra_module	= THIS_MODULE,			\
62		.digestsize		= digest_size,			\
63		.setkey			= crypto_blake2b_setkey,	\
64		.init			= crypto_blake2b_init,		\
65		.update			= crypto_blake2b_update_neon,	\
66		.final			= crypto_blake2b_final_neon,	\
67		.descsize		= sizeof(struct blake2b_state),	\
68	}
69
70static struct shash_alg blake2b_neon_algs[] = {
71	BLAKE2B_ALG("blake2b-160", "blake2b-160-neon", BLAKE2B_160_HASH_SIZE),
72	BLAKE2B_ALG("blake2b-256", "blake2b-256-neon", BLAKE2B_256_HASH_SIZE),
73	BLAKE2B_ALG("blake2b-384", "blake2b-384-neon", BLAKE2B_384_HASH_SIZE),
74	BLAKE2B_ALG("blake2b-512", "blake2b-512-neon", BLAKE2B_512_HASH_SIZE),
75};
76
77static int __init blake2b_neon_mod_init(void)
78{
79	if (!(elf_hwcap & HWCAP_NEON))
80		return -ENODEV;
81
82	return crypto_register_shashes(blake2b_neon_algs,
83				       ARRAY_SIZE(blake2b_neon_algs));
84}
85
86static void __exit blake2b_neon_mod_exit(void)
87{
88	crypto_unregister_shashes(blake2b_neon_algs,
89				  ARRAY_SIZE(blake2b_neon_algs));
90}
91
92module_init(blake2b_neon_mod_init);
93module_exit(blake2b_neon_mod_exit);
94
95MODULE_DESCRIPTION("BLAKE2b digest algorithm, NEON accelerated");
96MODULE_LICENSE("GPL");
97MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
98MODULE_ALIAS_CRYPTO("blake2b-160");
99MODULE_ALIAS_CRYPTO("blake2b-160-neon");
100MODULE_ALIAS_CRYPTO("blake2b-256");
101MODULE_ALIAS_CRYPTO("blake2b-256-neon");
102MODULE_ALIAS_CRYPTO("blake2b-384");
103MODULE_ALIAS_CRYPTO("blake2b-384-neon");
104MODULE_ALIAS_CRYPTO("blake2b-512");
105MODULE_ALIAS_CRYPTO("blake2b-512-neon");
106