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802c7f1c SB |
1 | /* |
2 | * Diffie-Hellman secret to be used with kpp API along with helper functions | |
3 | * | |
4 | * Copyright (c) 2016, Intel Corporation | |
5 | * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
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. | |
11 | * | |
12 | */ | |
13 | #ifndef _CRYPTO_DH_ | |
14 | #define _CRYPTO_DH_ | |
15 | ||
8d23da22 SM |
16 | /** |
17 | * DOC: DH Helper Functions | |
18 | * | |
19 | * To use DH with the KPP cipher API, the following data structure and | |
20 | * functions should be used. | |
21 | * | |
22 | * To use DH with KPP, the following functions should be used to operate on | |
23 | * a DH private key. The packet private key that can be set with | |
24 | * the KPP API function call of crypto_kpp_set_secret. | |
25 | */ | |
26 | ||
27 | /** | |
28 | * struct dh - define a DH private key | |
29 | * | |
30 | * @key: Private DH key | |
31 | * @p: Diffie-Hellman parameter P | |
32 | * @g: Diffie-Hellman generator G | |
33 | * @key_size: Size of the private DH key | |
34 | * @p_size: Size of DH parameter P | |
35 | * @g_size: Size of DH generator G | |
36 | */ | |
802c7f1c SB |
37 | struct dh { |
38 | void *key; | |
39 | void *p; | |
40 | void *g; | |
41 | unsigned int key_size; | |
42 | unsigned int p_size; | |
43 | unsigned int g_size; | |
44 | }; | |
45 | ||
8d23da22 SM |
46 | /** |
47 | * crypto_dh_key_len() - Obtain the size of the private DH key | |
48 | * @params: private DH key | |
49 | * | |
50 | * This function returns the packet DH key size. A caller can use that | |
51 | * with the provided DH private key reference to obtain the required | |
52 | * memory size to hold a packet key. | |
53 | * | |
54 | * Return: size of the key in bytes | |
55 | */ | |
802c7f1c | 56 | int crypto_dh_key_len(const struct dh *params); |
8d23da22 SM |
57 | |
58 | /** | |
59 | * crypto_dh_encode_key() - encode the private key | |
60 | * @buf: Buffer allocated by the caller to hold the packet DH | |
61 | * private key. The buffer should be at least crypto_dh_key_len | |
62 | * bytes in size. | |
63 | * @len: Length of the packet private key buffer | |
64 | * @params: Buffer with the caller-specified private key | |
65 | * | |
66 | * The DH implementations operate on a packet representation of the private | |
67 | * key. | |
68 | * | |
69 | * Return: -EINVAL if buffer has insufficient size, 0 on success | |
70 | */ | |
802c7f1c | 71 | int crypto_dh_encode_key(char *buf, unsigned int len, const struct dh *params); |
8d23da22 SM |
72 | |
73 | /** | |
74 | * crypto_dh_decode_key() - decode a private key | |
75 | * @buf: Buffer holding a packet key that should be decoded | |
76 | * @len: Lenth of the packet private key buffer | |
77 | * @params: Buffer allocated by the caller that is filled with the | |
78 | * unpacket DH private key. | |
79 | * | |
80 | * The unpacking obtains the private key by pointing @p to the correct location | |
81 | * in @buf. Thus, both pointers refer to the same memory. | |
82 | * | |
83 | * Return: -EINVAL if buffer has insufficient size, 0 on success | |
84 | */ | |
802c7f1c SB |
85 | int crypto_dh_decode_key(const char *buf, unsigned int len, struct dh *params); |
86 | ||
87 | #endif |