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1/* SPDX-License-Identifier: GPL-2.0-or-later */2/* Asymmetric public-key algorithm definitions3 *4 * See Documentation/crypto/asymmetric-keys.rst5 *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_H11#define _LINUX_PUBLIC_KEY_H12 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 public21 * part.22 */23struct 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 38extern void public_key_free(struct public_key *key);39 40/*41 * Public key cryptography signature data42 */43struct 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 54extern void public_key_signature_free(struct public_key_signature *sig);55 56extern struct asymmetric_key_subtype public_key_subtype;57 58struct key;59struct key_type;60union key_payload;61 62extern 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 67extern 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 72extern 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)78extern 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);82int 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#else87static 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 95static 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#endif103 104extern int query_asymmetric_key(const struct kernel_pkey_params *,105 struct kernel_pkey_query *);106 107extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);108extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);109extern int create_signature(struct kernel_pkey_params *, const void *, void *);110extern int verify_signature(const struct key *,111 const struct public_key_signature *);112 113#if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)114int public_key_verify_signature(const struct public_key *pkey,115 const struct public_key_signature *sig);116#else117static inline118int public_key_verify_signature(const struct public_key *pkey,119 const struct public_key_signature *sig)120{121 return -EINVAL;122}123#endif124 125#endif /* _LINUX_PUBLIC_KEY_H */126