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 */
22 struct 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 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 */
35 };
36
37 extern void public_key_free(struct public_key *key);
38
39 /*
40 * Public key cryptography signature data
41 */
42 struct public_key_signature {
43 struct asymmetric_key_id *auth_ids[3];
44 u8 *s; /* Signature */
45 u8 *digest;
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;
50 const char *encoding;
51 };
52
53 extern void public_key_signature_free(struct public_key_signature *sig);
54
55 extern struct asymmetric_key_subtype public_key_subtype;
56
57 struct key;
58 struct key_type;
59 union key_payload;
60
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);
65
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,
69 struct key *trusted);
70
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,
74 struct key *trusted);
75
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);
81 int restrict_link_by_digsig(struct key *dest_keyring,
82 const struct key_type *type,
83 const union key_payload *payload,
84 struct key *trust_keyring);
85 #else
restrict_link_by_ca(struct key * dest_keyring,const struct key_type * type,const union key_payload * payload,struct key * trust_keyring)86 static inline int restrict_link_by_ca(struct key *dest_keyring,
87 const struct key_type *type,
88 const union key_payload *payload,
89 struct key *trust_keyring)
90 {
91 return 0;
92 }
93
restrict_link_by_digsig(struct key * dest_keyring,const struct key_type * type,const union key_payload * payload,struct key * trust_keyring)94 static inline int restrict_link_by_digsig(struct key *dest_keyring,
95 const struct key_type *type,
96 const union key_payload *payload,
97 struct key *trust_keyring)
98 {
99 return 0;
100 }
101 #endif
102
103 extern int query_asymmetric_key(const struct kernel_pkey_params *,
104 struct kernel_pkey_query *);
105
106 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
107 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
108 extern int create_signature(struct kernel_pkey_params *, const void *, void *);
109 extern int verify_signature(const struct key *,
110 const struct public_key_signature *);
111
112 #if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
113 int public_key_verify_signature(const struct public_key *pkey,
114 const struct public_key_signature *sig);
115 #else
116 static inline
public_key_verify_signature(const struct public_key * pkey,const struct public_key_signature * sig)117 int public_key_verify_signature(const struct public_key *pkey,
118 const struct public_key_signature *sig)
119 {
120 return -EINVAL;
121 }
122 #endif
123
124 #endif /* _LINUX_PUBLIC_KEY_H */
125
