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 }; 32 33 extern void public_key_free(struct public_key *key); 34 35 /* 36 * Public key cryptography signature data 37 */ 38 struct public_key_signature { 39 struct asymmetric_key_id *auth_ids[2]; 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 51 extern void public_key_signature_free(struct public_key_signature *sig); 52 53 extern struct asymmetric_key_subtype public_key_subtype; 54 55 struct key; 56 struct key_type; 57 union key_payload; 58 59 extern 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 64 extern 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 69 extern 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 74 extern int query_asymmetric_key(const struct kernel_pkey_params *, 75 struct kernel_pkey_query *); 76 77 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *); 78 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *); 79 extern int create_signature(struct kernel_pkey_params *, const void *, void *); 80 extern int verify_signature(const struct key *, 81 const struct public_key_signature *); 82 83 int public_key_verify_signature(const struct public_key *pkey, 84 const struct public_key_signature *sig); 85 86 #endif /* _LINUX_PUBLIC_KEY_H */ 87