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/errno.h> 14 #include <linux/keyctl.h> 15 #include <linux/oid_registry.h> 16 17 /* 18 * Cryptographic data for the public-key subtype of the asymmetric key type. 19 * 20 * Note that this may include private part of the key as well as the public 21 * part. 22 */ 23 struct public_key { 24 void *key; 25 u32 keylen; 26 enum OID algo; 27 void *params; 28 u32 paramlen; 29 bool key_is_private; 30 const char *id_type; 31 const char *pkey_algo; 32 unsigned long key_eflags; /* key extension flags */ 33 #define KEY_EFLAG_CA 0 /* set if the CA basic constraints is set */ 34 #define KEY_EFLAG_DIGITALSIG 1 /* set if the digitalSignature usage is set */ 35 #define KEY_EFLAG_KEYCERTSIGN 2 /* set if the keyCertSign usage is set */ 36 }; 37 38 extern void public_key_free(struct public_key *key); 39 40 /* 41 * Public key cryptography signature data 42 */ 43 struct public_key_signature { 44 struct asymmetric_key_id *auth_ids[3]; 45 u8 *s; /* Signature */ 46 u8 *digest; 47 u32 s_size; /* Number of bytes in signature */ 48 u32 digest_size; /* Number of bytes in digest */ 49 const char *pkey_algo; 50 const char *hash_algo; 51 const char *encoding; 52 }; 53 54 extern void public_key_signature_free(struct public_key_signature *sig); 55 56 extern struct asymmetric_key_subtype public_key_subtype; 57 58 struct key; 59 struct key_type; 60 union key_payload; 61 62 extern int restrict_link_by_signature(struct key *dest_keyring, 63 const struct key_type *type, 64 const union key_payload *payload, 65 struct key *trust_keyring); 66 67 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring, 68 const struct key_type *type, 69 const union key_payload *payload, 70 struct key *trusted); 71 72 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring, 73 const struct key_type *type, 74 const union key_payload *payload, 75 struct key *trusted); 76 77 #if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE) 78 extern int restrict_link_by_ca(struct key *dest_keyring, 79 const struct key_type *type, 80 const union key_payload *payload, 81 struct key *trust_keyring); 82 int restrict_link_by_digsig(struct key *dest_keyring, 83 const struct key_type *type, 84 const union key_payload *payload, 85 struct key *trust_keyring); 86 #else 87 static inline int restrict_link_by_ca(struct key *dest_keyring, 88 const struct key_type *type, 89 const union key_payload *payload, 90 struct key *trust_keyring) 91 { 92 return 0; 93 } 94 95 static inline int restrict_link_by_digsig(struct key *dest_keyring, 96 const struct key_type *type, 97 const union key_payload *payload, 98 struct key *trust_keyring) 99 { 100 return 0; 101 } 102 #endif 103 104 extern int query_asymmetric_key(const struct kernel_pkey_params *, 105 struct kernel_pkey_query *); 106 107 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *); 108 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *); 109 extern int create_signature(struct kernel_pkey_params *, const void *, void *); 110 extern int verify_signature(const struct key *, 111 const struct public_key_signature *); 112 113 #if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) 114 int public_key_verify_signature(const struct public_key *pkey, 115 const struct public_key_signature *sig); 116 #else 117 static inline 118 int public_key_verify_signature(const struct public_key *pkey, 119 const struct public_key_signature *sig) 120 { 121 return -EINVAL; 122 } 123 #endif 124 125 #endif /* _LINUX_PUBLIC_KEY_H */ 126