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 * The use to which an asymmetric key is being put.
19 */
20enum key_being_used_for {
21	VERIFYING_MODULE_SIGNATURE,
22	VERIFYING_FIRMWARE_SIGNATURE,
23	VERIFYING_KEXEC_PE_SIGNATURE,
24	VERIFYING_KEY_SIGNATURE,
25	VERIFYING_KEY_SELF_SIGNATURE,
26	VERIFYING_UNSPECIFIED_SIGNATURE,
27	NR__KEY_BEING_USED_FOR
28};
29extern const char *const key_being_used_for[NR__KEY_BEING_USED_FOR];
30
31/*
32 * Cryptographic data for the public-key subtype of the asymmetric key type.
33 *
34 * Note that this may include private part of the key as well as the public
35 * part.
36 */
37struct public_key {
38	void *key;
39	u32 keylen;
40	const char *id_type;
41	const char *pkey_algo;
42};
43
44extern void public_key_destroy(void *payload);
45
46/*
47 * Public key cryptography signature data
48 */
49struct public_key_signature {
50	u8 *s;			/* Signature */
51	u32 s_size;		/* Number of bytes in signature */
52	u8 *digest;
53	u8 digest_size;		/* Number of bytes in digest */
54	const char *pkey_algo;
55	const char *hash_algo;
56};
57
58extern struct asymmetric_key_subtype public_key_subtype;
59struct key;
60extern int verify_signature(const struct key *key,
61			    const struct public_key_signature *sig);
62
63struct asymmetric_key_id;
64extern struct key *x509_request_asymmetric_key(struct key *keyring,
65					       const struct asymmetric_key_id *id,
66					       const struct asymmetric_key_id *skid,
67					       bool partial);
68
69int public_key_verify_signature(const struct public_key *pkey,
70				const struct public_key_signature *sig);
71
72#endif /* _LINUX_PUBLIC_KEY_H */