1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/* Asymmetric public-key algorithm definitions
 3 *
 4 * See Documentation/crypto/asymmetric-keys.rst
 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[3];
40	u8 *s;			/* Signature */
41	u8 *digest;
42	u32 s_size;		/* Number of bytes in signature */
43	u32 digest_size;	/* Number of bytes in digest */
44	const char *pkey_algo;
45	const char *hash_algo;
46	const char *encoding;
47	const void *data;
48	unsigned int data_size;
49};
50
51extern void public_key_signature_free(struct public_key_signature *sig);
52
53extern struct asymmetric_key_subtype public_key_subtype;
54
55struct key;
56struct key_type;
57union key_payload;
58
59extern int restrict_link_by_signature(struct key *dest_keyring,
60				      const struct key_type *type,
61				      const union key_payload *payload,
62				      struct key *trust_keyring);
63
64extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
65					   const struct key_type *type,
66					   const union key_payload *payload,
67					   struct key *trusted);
68
69extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
70						 const struct key_type *type,
71						 const union key_payload *payload,
72						 struct key *trusted);
73
74extern int query_asymmetric_key(const struct kernel_pkey_params *,
75				struct kernel_pkey_query *);
76
77extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
78extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
79extern int create_signature(struct kernel_pkey_params *, const void *, void *);
80extern int verify_signature(const struct key *,
81			    const struct public_key_signature *);
82
83int public_key_verify_signature(const struct public_key *pkey,
84				const struct public_key_signature *sig);
85
86#endif /* _LINUX_PUBLIC_KEY_H */