1 /* SPDX-License-Identifier: GPL-2.0-or-later * <<
2 /* 1 /*
3 * Diffie-Hellman secret to be used with kpp A 2 * Diffie-Hellman secret to be used with kpp API along with helper functions
4 * 3 *
5 * Copyright (c) 2016, Intel Corporation 4 * Copyright (c) 2016, Intel Corporation
6 * Authors: Salvatore Benedetto <salvatore.ben 5 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com>
7 */ <<
8 #ifndef _CRYPTO_DH_ <<
9 #define _CRYPTO_DH_ <<
10 <<
11 /** <<
12 * DOC: DH Helper Functions <<
13 * 6 *
14 * To use DH with the KPP cipher API, the foll !! 7 * This program is free software; you can redistribute it and/or modify it
15 * functions should be used. !! 8 * under the terms of the GNU General Public License as published by the Free
>> 9 * Software Foundation; either version 2 of the License, or (at your option)
>> 10 * any later version.
16 * 11 *
17 * To use DH with KPP, the following functions <<
18 * a DH private key. The packet private key th <<
19 * the KPP API function call of crypto_kpp_set <<
20 */ 12 */
>> 13 #ifndef _CRYPTO_DH_
>> 14 #define _CRYPTO_DH_
21 15
22 /** <<
23 * struct dh - define a DH private key <<
24 * <<
25 * @key: Private DH key <<
26 * @p: Diffie-Hellman parameter P <<
27 * @g: Diffie-Hellman generator G <<
28 * @key_size: Size of the private DH key <<
29 * @p_size: Size of DH parameter P <<
30 * @g_size: Size of DH generator G <<
31 */ <<
32 struct dh { 16 struct dh {
33 const void *key; !! 17 void *key;
34 const void *p; !! 18 void *p;
35 const void *g; !! 19 void *g;
36 unsigned int key_size; 20 unsigned int key_size;
37 unsigned int p_size; 21 unsigned int p_size;
38 unsigned int g_size; 22 unsigned int g_size;
39 }; 23 };
40 24
41 /** !! 25 int crypto_dh_key_len(const struct dh *params);
42 * crypto_dh_key_len() - Obtain the size of th <<
43 * @params: private DH key <<
44 * <<
45 * This function returns the packet DH key siz <<
46 * with the provided DH private key reference <<
47 * memory size to hold a packet key. <<
48 * <<
49 * Return: size of the key in bytes <<
50 */ <<
51 unsigned int crypto_dh_key_len(const struct dh <<
52 <<
53 /** <<
54 * crypto_dh_encode_key() - encode the private <<
55 * @buf: Buffer allocated by the caller <<
56 * private key. The buffer should <<
57 * bytes in size. <<
58 * @len: Length of the packet private k <<
59 * @params: Buffer with the caller-specifi <<
60 * <<
61 * The DH implementations operate on a packet <<
62 * key. <<
63 * <<
64 * Return: -EINVAL if buffer has insuffic <<
65 */ <<
66 int crypto_dh_encode_key(char *buf, unsigned i 26 int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params);
67 <<
68 /** <<
69 * crypto_dh_decode_key() - decode a private k <<
70 * @buf: Buffer holding a packet key th <<
71 * @len: Length of the packet private k <<
72 * @params: Buffer allocated by the caller <<
73 * unpacked DH private key. <<
74 * <<
75 * The unpacking obtains the private key by po <<
76 * in @buf. Thus, both pointers refer to the s <<
77 * <<
78 * Return: -EINVAL if buffer has insuffic <<
79 */ <<
80 int crypto_dh_decode_key(const char *buf, unsi 27 int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params);
81 <<
82 /** <<
83 * __crypto_dh_decode_key() - decode a private <<
84 * @buf: Buffer holding a packet key th <<
85 * @len: Length of the packet private k <<
86 * @params: Buffer allocated by the caller <<
87 * unpacked DH private key. <<
88 * <<
89 * Internal function providing the same servic <<
90 * crypto_dh_decode_key(), but without any of <<
91 * checks conducted by the latter. <<
92 * <<
93 * Return: -EINVAL if buffer has insuffic <<
94 */ <<
95 int __crypto_dh_decode_key(const char *buf, un <<
96 struct dh *params); <<
97 28
98 #endif 29 #endif
99 30
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