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David Howellsa9681bf2012-09-21 23:24:55 +01001/* Asymmetric public-key algorithm definitions
2 *
3 * See Documentation/crypto/asymmetric-keys.txt
4 *
5 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
6 * Written by David Howells (dhowells@redhat.com)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public Licence
10 * as published by the Free Software Foundation; either version
11 * 2 of the Licence, or (at your option) any later version.
12 */
13
14#ifndef _LINUX_PUBLIC_KEY_H
15#define _LINUX_PUBLIC_KEY_H
16
17#include <linux/mpi.h>
18
19enum pkey_algo {
20 PKEY_ALGO_DSA,
21 PKEY_ALGO_RSA,
22 PKEY_ALGO__LAST
23};
24
25extern const char *const pkey_algo[PKEY_ALGO__LAST];
26
27enum pkey_hash_algo {
28 PKEY_HASH_MD4,
29 PKEY_HASH_MD5,
30 PKEY_HASH_SHA1,
31 PKEY_HASH_RIPE_MD_160,
32 PKEY_HASH_SHA256,
33 PKEY_HASH_SHA384,
34 PKEY_HASH_SHA512,
35 PKEY_HASH_SHA224,
36 PKEY_HASH__LAST
37};
38
39extern const char *const pkey_hash_algo[PKEY_HASH__LAST];
40
41enum pkey_id_type {
42 PKEY_ID_PGP, /* OpenPGP generated key ID */
43 PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
44 PKEY_ID_TYPE__LAST
45};
46
47extern const char *const pkey_id_type[PKEY_ID_TYPE__LAST];
48
49/*
50 * Cryptographic data for the public-key subtype of the asymmetric key type.
51 *
52 * Note that this may include private part of the key as well as the public
53 * part.
54 */
55struct public_key {
56 const struct public_key_algorithm *algo;
57 u8 capabilities;
58#define PKEY_CAN_ENCRYPT 0x01
59#define PKEY_CAN_DECRYPT 0x02
60#define PKEY_CAN_SIGN 0x04
61#define PKEY_CAN_VERIFY 0x08
62 enum pkey_id_type id_type : 8;
63 union {
64 MPI mpi[5];
65 struct {
66 MPI p; /* DSA prime */
67 MPI q; /* DSA group order */
68 MPI g; /* DSA group generator */
69 MPI y; /* DSA public-key value = g^x mod p */
70 MPI x; /* DSA secret exponent (if present) */
71 } dsa;
72 struct {
73 MPI n; /* RSA public modulus */
74 MPI e; /* RSA public encryption exponent */
75 MPI d; /* RSA secret encryption exponent (if present) */
76 MPI p; /* RSA secret prime (if present) */
77 MPI q; /* RSA secret prime (if present) */
78 } rsa;
79 };
80};
81
82extern void public_key_destroy(void *payload);
83
84/*
85 * Public key cryptography signature data
86 */
87struct public_key_signature {
88 u8 *digest;
89 u8 digest_size; /* Number of bytes in digest */
90 u8 nr_mpi; /* Occupancy of mpi[] */
91 enum pkey_hash_algo pkey_hash_algo : 8;
92 union {
93 MPI mpi[2];
94 struct {
95 MPI s; /* m^d mod n */
96 } rsa;
97 struct {
98 MPI r;
99 MPI s;
100 } dsa;
101 };
102};
103
David Howells4ae71c12012-09-21 23:25:04 +0100104struct key;
105extern int verify_signature(const struct key *key,
106 const struct public_key_signature *sig);
107
David Howellsa9681bf2012-09-21 23:24:55 +0100108#endif /* _LINUX_PUBLIC_KEY_H */