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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Asymmetric public-key algorithm definitions
3 *
4 * See Documentation/crypto/asymmetric-keys.txt
5 *
6 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
8 */
9
10#ifndef _LINUX_PUBLIC_KEY_H
11#define _LINUX_PUBLIC_KEY_H
12
13#include <linux/keyctl.h>
14#include <linux/oid_registry.h>
15
16/*
17 * Cryptographic data for the public-key subtype of the asymmetric key type.
18 *
19 * Note that this may include private part of the key as well as the public
20 * part.
21 */
22struct public_key {
23 void *key;
24 u32 keylen;
25 enum OID algo;
26 void *params;
27 u32 paramlen;
28 bool key_is_private;
29 const char *id_type;
30 const char *pkey_algo;
31};
32
33extern void public_key_free(struct public_key *key);
34
35/*
36 * Public key cryptography signature data
37 */
38struct public_key_signature {
39 struct asymmetric_key_id *auth_ids[2];
40 u8 *s; /* Signature */
41 u32 s_size; /* Number of bytes in signature */
42 u8 *digest;
43 u8 digest_size; /* Number of bytes in digest */
44 const char *pkey_algo;
45 const char *hash_algo;
46 const char *encoding;
47};
48
49extern void public_key_signature_free(struct public_key_signature *sig);
50
51extern struct asymmetric_key_subtype public_key_subtype;
52
53struct key;
54struct key_type;
55union key_payload;
56
57extern int restrict_link_by_signature(struct key *dest_keyring,
58 const struct key_type *type,
59 const union key_payload *payload,
60 struct key *trust_keyring);
61
62extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
63 const struct key_type *type,
64 const union key_payload *payload,
65 struct key *trusted);
66
67extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
68 const struct key_type *type,
69 const union key_payload *payload,
70 struct key *trusted);
71
72extern int query_asymmetric_key(const struct kernel_pkey_params *,
73 struct kernel_pkey_query *);
74
75extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
76extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
77extern int create_signature(struct kernel_pkey_params *, const void *, void *);
78extern int verify_signature(const struct key *,
79 const struct public_key_signature *);
80
81int public_key_verify_signature(const struct public_key *pkey,
82 const struct public_key_signature *sig);
83
84#endif /* _LINUX_PUBLIC_KEY_H */