1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum
4 * (AVX2 accelerated version)
5 *
6 * Copyright 2018 Google LLC
7 */
8
9 #include <crypto/internal/hash.h>
10 #include <crypto/internal/simd.h>
11 #include <crypto/nhpoly1305.h>
12 #include <linux/module.h>
13 #include <linux/sizes.h>
14 #include <asm/simd.h>
15
16 asmlinkage void nh_avx2(const u32 *key, const u8 *message, size_t message_len,
17 __le64 hash[NH_NUM_PASSES]);
18
nhpoly1305_avx2_update(struct shash_desc * desc,const u8 * src,unsigned int srclen)19 static int nhpoly1305_avx2_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_fpu_begin();
29 crypto_nhpoly1305_update_helper(desc, src, n, nh_avx2);
30 kernel_fpu_end();
31 src += n;
32 srclen -= n;
33 } while (srclen);
34 return 0;
35 }
36
37 static struct shash_alg nhpoly1305_alg = {
38 .base.cra_name = "nhpoly1305",
39 .base.cra_driver_name = "nhpoly1305-avx2",
40 .base.cra_priority = 300,
41 .base.cra_ctxsize = sizeof(struct nhpoly1305_key),
42 .base.cra_module = THIS_MODULE,
43 .digestsize = POLY1305_DIGEST_SIZE,
44 .init = crypto_nhpoly1305_init,
45 .update = nhpoly1305_avx2_update,
46 .final = crypto_nhpoly1305_final,
47 .setkey = crypto_nhpoly1305_setkey,
48 .descsize = sizeof(struct nhpoly1305_state),
49 };
50
nhpoly1305_mod_init(void)51 static int __init nhpoly1305_mod_init(void)
52 {
53 if (!boot_cpu_has(X86_FEATURE_AVX2) ||
54 !boot_cpu_has(X86_FEATURE_OSXSAVE))
55 return -ENODEV;
56
57 return crypto_register_shash(&nhpoly1305_alg);
58 }
59
nhpoly1305_mod_exit(void)60 static void __exit nhpoly1305_mod_exit(void)
61 {
62 crypto_unregister_shash(&nhpoly1305_alg);
63 }
64
65 module_init(nhpoly1305_mod_init);
66 module_exit(nhpoly1305_mod_exit);
67
68 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (AVX2-accelerated)");
69 MODULE_LICENSE("GPL v2");
70 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
71 MODULE_ALIAS_CRYPTO("nhpoly1305");
72 MODULE_ALIAS_CRYPTO("nhpoly1305-avx2");
73