1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* Asymmetric public-key algorithm definitions
4 * See Documentation/crypto/asymmetric-keys.rst
6 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
7 * Written by David Howells (dhowells@redhat.com)
10 #ifndef _LINUX_PUBLIC_KEY_H
11 #define _LINUX_PUBLIC_KEY_H
13 #include <linux/keyctl.h>
14 #include <linux/oid_registry.h>
17 * Cryptographic data for the public-key subtype of the asymmetric key type.
19 * Note that this may include private part of the key as well as the public
30 const char *pkey_algo;
31 unsigned long key_eflags; /* key extension flags */
32 #define KEY_EFLAG_CA 0 /* set if the CA basic constraints is set */
33 #define KEY_EFLAG_DIGITALSIG 1 /* set if the digitalSignature usage is set */
34 #define KEY_EFLAG_KEYCERTSIGN 2 /* set if the keyCertSign usage is set */
37 extern void public_key_free(struct public_key *key);
40 * Public key cryptography signature data
42 struct public_key_signature {
43 struct asymmetric_key_id *auth_ids[3];
44 u8 *s; /* Signature */
46 u32 s_size; /* Number of bytes in signature */
47 u32 digest_size; /* Number of bytes in digest */
48 const char *pkey_algo;
49 const char *hash_algo;
53 extern void public_key_signature_free(struct public_key_signature *sig);
55 extern struct asymmetric_key_subtype public_key_subtype;
61 extern int restrict_link_by_signature(struct key *dest_keyring,
62 const struct key_type *type,
63 const union key_payload *payload,
64 struct key *trust_keyring);
66 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
67 const struct key_type *type,
68 const union key_payload *payload,
71 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
72 const struct key_type *type,
73 const union key_payload *payload,
76 #if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE)
77 extern int restrict_link_by_ca(struct key *dest_keyring,
78 const struct key_type *type,
79 const union key_payload *payload,
80 struct key *trust_keyring);
82 static inline int restrict_link_by_ca(struct key *dest_keyring,
83 const struct key_type *type,
84 const union key_payload *payload,
85 struct key *trust_keyring)
91 extern int query_asymmetric_key(const struct kernel_pkey_params *,
92 struct kernel_pkey_query *);
94 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
95 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
96 extern int create_signature(struct kernel_pkey_params *, const void *, void *);
97 extern int verify_signature(const struct key *,
98 const struct public_key_signature *);
100 #if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
101 int public_key_verify_signature(const struct public_key *pkey,
102 const struct public_key_signature *sig);
105 int public_key_verify_signature(const struct public_key *pkey,
106 const struct public_key_signature *sig)
112 #endif /* _LINUX_PUBLIC_KEY_H */