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
11#include <linux/module.h>
12#include <linux/sizes.h>
13
14#include <asm/neon.h>
15#include <asm/simd.h>
16
17asmlinkage void blake2b_compress_neon(struct blake2b_state *state,
18 const u8 *block, size_t nblocks, u32 inc);
19
20static void blake2b_compress_arch(struct blake2b_state *state,
21 const u8 *block, size_t nblocks, u32 inc)
22{
23 do {
24 const size_t blocks = min_t(size_t, nblocks,
25 SZ_4K / BLAKE2B_BLOCK_SIZE);
26
27 kernel_neon_begin();
28 blake2b_compress_neon(state, block, nblocks: blocks, inc);
29 kernel_neon_end();
30
31 nblocks -= blocks;
32 block += blocks * BLAKE2B_BLOCK_SIZE;
33 } while (nblocks);
34}
35
36static int crypto_blake2b_update_neon(struct shash_desc *desc,
37 const u8 *in, unsigned int inlen)
38{
39 return crypto_blake2b_update_bo(desc, in, inlen, compress: blake2b_compress_arch);
40}
41
42static int crypto_blake2b_finup_neon(struct shash_desc *desc, const u8 *in,
43 unsigned int inlen, u8 *out)
44{
45 return crypto_blake2b_finup(desc, in, inlen, out,
46 compress: blake2b_compress_arch);
47}
48
49#define BLAKE2B_ALG(name, driver_name, digest_size) \
50 { \
51 .base.cra_name = name, \
52 .base.cra_driver_name = driver_name, \
53 .base.cra_priority = 200, \
54 .base.cra_flags = CRYPTO_ALG_OPTIONAL_KEY | \
55 CRYPTO_AHASH_ALG_BLOCK_ONLY | \
56 CRYPTO_AHASH_ALG_FINAL_NONZERO, \
57 .base.cra_blocksize = BLAKE2B_BLOCK_SIZE, \
58 .base.cra_ctxsize = sizeof(struct blake2b_tfm_ctx), \
59 .base.cra_module = THIS_MODULE, \
60 .digestsize = digest_size, \
61 .setkey = crypto_blake2b_setkey, \
62 .init = crypto_blake2b_init, \
63 .update = crypto_blake2b_update_neon, \
64 .finup = crypto_blake2b_finup_neon, \
65 .descsize = sizeof(struct blake2b_state), \
66 .statesize = BLAKE2B_STATE_SIZE, \
67 }
68
69static struct shash_alg blake2b_neon_algs[] = {
70 BLAKE2B_ALG("blake2b-160", "blake2b-160-neon", BLAKE2B_160_HASH_SIZE),
71 BLAKE2B_ALG("blake2b-256", "blake2b-256-neon", BLAKE2B_256_HASH_SIZE),
72 BLAKE2B_ALG("blake2b-384", "blake2b-384-neon", BLAKE2B_384_HASH_SIZE),
73 BLAKE2B_ALG("blake2b-512", "blake2b-512-neon", BLAKE2B_512_HASH_SIZE),
74};
75
76static int __init blake2b_neon_mod_init(void)
77{
78 if (!(elf_hwcap & HWCAP_NEON))
79 return -ENODEV;
80
81 return crypto_register_shashes(algs: blake2b_neon_algs,
82 ARRAY_SIZE(blake2b_neon_algs));
83}
84
85static void __exit blake2b_neon_mod_exit(void)
86{
87 crypto_unregister_shashes(algs: blake2b_neon_algs,
88 ARRAY_SIZE(blake2b_neon_algs));
89}
90
91module_init(blake2b_neon_mod_init);
92module_exit(blake2b_neon_mod_exit);
93
94MODULE_DESCRIPTION("BLAKE2b digest algorithm, NEON accelerated");
95MODULE_LICENSE("GPL");
96MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
97MODULE_ALIAS_CRYPTO("blake2b-160");
98MODULE_ALIAS_CRYPTO("blake2b-160-neon");
99MODULE_ALIAS_CRYPTO("blake2b-256");
100MODULE_ALIAS_CRYPTO("blake2b-256-neon");
101MODULE_ALIAS_CRYPTO("blake2b-384");
102MODULE_ALIAS_CRYPTO("blake2b-384-neon");
103MODULE_ALIAS_CRYPTO("blake2b-512");
104MODULE_ALIAS_CRYPTO("blake2b-512-neon");
105

source code of linux/arch/arm/crypto/blake2b-neon-glue.c