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 #include <crypto/akcipher.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 }; 33 34 extern void public_key_free(struct public_key *key); 35 36 /* 37 * Public key cryptography signature data 38 */ 39 struct public_key_signature { 40 struct asymmetric_key_id *auth_ids[2]; 41 u8 *s; /* Signature */ 42 u32 s_size; /* Number of bytes in signature */ 43 u8 *digest; 44 u8 digest_size; /* Number of bytes in digest */ 45 const char *pkey_algo; 46 const char *hash_algo; 47 const char *encoding; 48 const void *data; 49 unsigned int data_size; 50 }; 51 52 extern void public_key_signature_free(struct public_key_signature *sig); 53 54 extern struct asymmetric_key_subtype public_key_subtype; 55 56 struct key; 57 struct key_type; 58 union key_payload; 59 60 extern int restrict_link_by_signature(struct key *dest_keyring, 61 const struct key_type *type, 62 const union key_payload *payload, 63 struct key *trust_keyring); 64 65 extern int restrict_link_by_key_or_keyring(struct key *dest_keyring, 66 const struct key_type *type, 67 const union key_payload *payload, 68 struct key *trusted); 69 70 extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring, 71 const struct key_type *type, 72 const union key_payload *payload, 73 struct key *trusted); 74 75 extern int query_asymmetric_key(const struct kernel_pkey_params *, 76 struct kernel_pkey_query *); 77 78 extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *); 79 extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *); 80 extern int create_signature(struct kernel_pkey_params *, const void *, void *); 81 extern int verify_signature(const struct key *, 82 const struct public_key_signature *); 83 84 int public_key_verify_signature(const struct public_key *pkey, 85 const struct public_key_signature *sig); 86 87 #endif /* _LINUX_PUBLIC_KEY_H */ 88