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
18 asmlinkage void blake2b_compress_neon(struct blake2b_state *state,
19 const u8 *block, size_t nblocks, u32 inc);
20
21 static 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
42 static 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
48 static 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
70 static 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
77 static 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
86 static void __exit blake2b_neon_mod_exit(void)
87 {
88 crypto_unregister_shashes(blake2b_neon_algs,
89 ARRAY_SIZE(blake2b_neon_algs));
90 }
91
92 module_init(blake2b_neon_mod_init);
93 module_exit(blake2b_neon_mod_exit);
94
95 MODULE_DESCRIPTION("BLAKE2b digest algorithm, NEON accelerated");
96 MODULE_LICENSE("GPL");
97 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
98 MODULE_ALIAS_CRYPTO("blake2b-160");
99 MODULE_ALIAS_CRYPTO("blake2b-160-neon");
100 MODULE_ALIAS_CRYPTO("blake2b-256");
101 MODULE_ALIAS_CRYPTO("blake2b-256-neon");
102 MODULE_ALIAS_CRYPTO("blake2b-384");
103 MODULE_ALIAS_CRYPTO("blake2b-384-neon");
104 MODULE_ALIAS_CRYPTO("blake2b-512");
105 MODULE_ALIAS_CRYPTO("blake2b-512-neon");
106
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