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Merge tag 'io_uring-5.7-2020-05-22' of git://git.kernel.dk/linux-block
[thirdparty/linux.git] / arch / x86 / crypto / nhpoly1305-sse2-glue.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum
4 * (SSE2 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 <asm/simd.h>
14
15 asmlinkage void nh_sse2(const u32 *key, const u8 *message, size_t message_len,
16 u8 hash[NH_HASH_BYTES]);
17
18 /* wrapper to avoid indirect call to assembly, which doesn't work with CFI */
19 static void _nh_sse2(const u32 *key, const u8 *message, size_t message_len,
20 __le64 hash[NH_NUM_PASSES])
21 {
22 nh_sse2(key, message, message_len, (u8 *)hash);
23 }
24
25 static int nhpoly1305_sse2_update(struct shash_desc *desc,
26 const u8 *src, unsigned int srclen)
27 {
28 if (srclen < 64 || !crypto_simd_usable())
29 return crypto_nhpoly1305_update(desc, src, srclen);
30
31 do {
32 unsigned int n = min_t(unsigned int, srclen, SZ_4K);
33
34 kernel_fpu_begin();
35 crypto_nhpoly1305_update_helper(desc, src, n, _nh_sse2);
36 kernel_fpu_end();
37 src += n;
38 srclen -= n;
39 } while (srclen);
40 return 0;
41 }
42
43 static struct shash_alg nhpoly1305_alg = {
44 .base.cra_name = "nhpoly1305",
45 .base.cra_driver_name = "nhpoly1305-sse2",
46 .base.cra_priority = 200,
47 .base.cra_ctxsize = sizeof(struct nhpoly1305_key),
48 .base.cra_module = THIS_MODULE,
49 .digestsize = POLY1305_DIGEST_SIZE,
50 .init = crypto_nhpoly1305_init,
51 .update = nhpoly1305_sse2_update,
52 .final = crypto_nhpoly1305_final,
53 .setkey = crypto_nhpoly1305_setkey,
54 .descsize = sizeof(struct nhpoly1305_state),
55 };
56
57 static int __init nhpoly1305_mod_init(void)
58 {
59 if (!boot_cpu_has(X86_FEATURE_XMM2))
60 return -ENODEV;
61
62 return crypto_register_shash(&nhpoly1305_alg);
63 }
64
65 static void __exit nhpoly1305_mod_exit(void)
66 {
67 crypto_unregister_shash(&nhpoly1305_alg);
68 }
69
70 module_init(nhpoly1305_mod_init);
71 module_exit(nhpoly1305_mod_exit);
72
73 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (SSE2-accelerated)");
74 MODULE_LICENSE("GPL v2");
75 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
76 MODULE_ALIAS_CRYPTO("nhpoly1305");
77 MODULE_ALIAS_CRYPTO("nhpoly1305-sse2");