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 const void *data; 52 unsigned int data_size; 53 }; 54 55 extern void public_key_signature_free(struct public_key_signature *sig); 56 57 extern struct asymmetric_key_subtype public_key_subtype; 58 59 struct key; 60 struct key_type; 61 union key_payload; 62 63 extern int restrict_link_by_signature(struct key *dest_keyring, 64 const struct key_type *type, 65 const union key_payload *payload, 66 struct key *trust_keyring); 67 68 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring, 69 const struct key_type *type, 70 const union key_payload *payload, 71 struct key *trusted); 72 73 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring, 74 const struct key_type *type, 75 const union key_payload *payload, 76 struct key *trusted); 77 78 #if IS_REACHABLE(CONFIG_ASYMMETRIC_KEY_TYPE) 79 extern int restrict_link_by_ca(struct key *dest_keyring, 80 const struct key_type *type, 81 const union key_payload *payload, 82 struct key *trust_keyring); 83 #else 84 static inline int restrict_link_by_ca(struct key *dest_keyring, 85 const struct key_type *type, 86 const union key_payload *payload, 87 struct key *trust_keyring) 88 { 89 return 0; 90 } 91 #endif 92 93 extern int query_asymmetric_key(const struct kernel_pkey_params *, 94 struct kernel_pkey_query *); 95 96 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *); 97 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *); 98 extern int create_signature(struct kernel_pkey_params *, const void *, void *); 99 extern int verify_signature(const struct key *, 100 const struct public_key_signature *); 101 102 #if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE) 103 int public_key_verify_signature(const struct public_key *pkey, 104 const struct public_key_signature *sig); 105 #else 106 static inline 107 int public_key_verify_signature(const struct public_key *pkey, 108 const struct public_key_signature *sig) 109 { 110 return -EINVAL; 111 } 112 #endif 113 114 #endif /* _LINUX_PUBLIC_KEY_H */ 115