1/* 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/*
18 * Cryptographic data for the public-key subtype of the asymmetric key type.
19 *
20 * Note that this may include private part of the key as well as the public
21 * part.
22 */
23struct public_key {
24	void *key;
25	u32 keylen;
26	const char *id_type;
27	const char *pkey_algo;
28};
29
30extern void public_key_free(struct public_key *key);
31
32/*
33 * Public key cryptography signature data
34 */
35struct public_key_signature {
36	struct asymmetric_key_id *auth_ids[2];
37	u8 *s;			/* Signature */
38	u32 s_size;		/* Number of bytes in signature */
39	u8 *digest;
40	u8 digest_size;		/* Number of bytes in digest */
41	const char *pkey_algo;
42	const char *hash_algo;
43};
44
45extern void public_key_signature_free(struct public_key_signature *sig);
46
47extern struct asymmetric_key_subtype public_key_subtype;
48
49struct key;
50struct key_type;
51union key_payload;
52
53extern int restrict_link_by_signature(struct key *dest_keyring,
54				      const struct key_type *type,
55				      const union key_payload *payload,
56				      struct key *trust_keyring);
57
58extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
59					   const struct key_type *type,
60					   const union key_payload *payload,
61					   struct key *trusted);
62
63extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
64						 const struct key_type *type,
65						 const union key_payload *payload,
66						 struct key *trusted);
67
68extern int verify_signature(const struct key *key,
69			    const struct public_key_signature *sig);
70
71int public_key_verify_signature(const struct public_key *pkey,
72				const struct public_key_signature *sig);
73
74#endif /* _LINUX_PUBLIC_KEY_H */