1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*
* This is an implementation of the Curve25519 ECDH algorithm, using either an
* architecture-optimized implementation or a generic implementation. The
* generic implementation is either 32-bit, or 64-bit with 128-bit integers,
* depending on what is supported by the target compiler.
*
* Information: https://cr.yp.to/ecdh.html
*/
#include <crypto/curve25519.h>
#include <crypto/utils.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/module.h>
static const u8 curve25519_null_point[CURVE25519_KEY_SIZE] __aligned(32) = { 0 };
static const u8 curve25519_base_point[CURVE25519_KEY_SIZE] __aligned(32) = { 9 };
#ifdef CONFIG_CRYPTO_LIB_CURVE25519_ARCH
#include "curve25519.h" /* $(SRCARCH)/curve25519.h */
#else
static void curve25519_arch(u8 mypublic[CURVE25519_KEY_SIZE],
const u8 secret[CURVE25519_KEY_SIZE],
const u8 basepoint[CURVE25519_KEY_SIZE])
{
curve25519_generic(mypublic, secret, basepoint);
}
static void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
const u8 secret[CURVE25519_KEY_SIZE])
{
curve25519_generic(pub, secret, curve25519_base_point);
}
#endif
bool __must_check
curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
const u8 secret[CURVE25519_KEY_SIZE],
const u8 basepoint[CURVE25519_KEY_SIZE])
{
curve25519_arch(mypublic, secret, basepoint);
return crypto_memneq(mypublic, curve25519_null_point,
CURVE25519_KEY_SIZE);
}
EXPORT_SYMBOL(curve25519);
bool __must_check
curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
const u8 secret[CURVE25519_KEY_SIZE])
{
if (unlikely(!crypto_memneq(secret, curve25519_null_point,
CURVE25519_KEY_SIZE)))
return false;
curve25519_base_arch(pub, secret);
return crypto_memneq(pub, curve25519_null_point, CURVE25519_KEY_SIZE);
}
EXPORT_SYMBOL(curve25519_generate_public);
#ifdef curve25519_mod_init_arch
static int __init curve25519_mod_init(void)
{
curve25519_mod_init_arch();
return 0;
}
subsys_initcall(curve25519_mod_init);
static void __exit curve25519_mod_exit(void)
{
}
module_exit(curve25519_mod_exit);
#endif
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Curve25519 algorithm");
MODULE_AUTHOR("Jason A. Donenfeld <Jason@zx2c4.com>");
|
