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
16 asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len,
17 __le64 hash[NH_NUM_PASSES]);
18
nhpoly1305_neon_update(struct shash_desc * desc,const u8 * src,unsigned int srclen)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
nhpoly1305_neon_digest(struct shash_desc * desc,const u8 * src,unsigned int srclen,u8 * out)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
nhpoly1305_mod_init(void)60 static int __init nhpoly1305_mod_init(void)
61 {
62 if (!cpu_have_named_feature(ASIMD))
63 return -ENODEV;
64
65 return crypto_register_shash(&nhpoly1305_alg);
66 }
67
nhpoly1305_mod_exit(void)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