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567671281a
Parse the X.509 Key Usage. The key usage extension defines the purpose of
the key contained in the certificate.
id-ce-keyUsage OBJECT IDENTIFIER ::= { id-ce 15 }
KeyUsage ::= BIT STRING {
digitalSignature (0),
contentCommitment (1),
keyEncipherment (2),
dataEncipherment (3),
keyAgreement (4),
keyCertSign (5),
cRLSign (6),
encipherOnly (7),
decipherOnly (8) }
If the keyCertSign or digitalSignature is set, store it in the
public_key structure. Having the purpose of the key being stored
during parsing, allows enforcement on the usage field in the future.
This will be used in a follow on patch that requires knowing the
certificate key usage type.
Link: https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.3
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Asymmetric public-key algorithm definitions
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*
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* See Documentation/crypto/asymmetric-keys.rst
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef _LINUX_PUBLIC_KEY_H
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#define _LINUX_PUBLIC_KEY_H
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#include <linux/keyctl.h>
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#include <linux/oid_registry.h>
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/*
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* Cryptographic data for the public-key subtype of the asymmetric key type.
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*
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* Note that this may include private part of the key as well as the public
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* part.
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*/
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struct public_key {
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void *key;
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u32 keylen;
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enum OID algo;
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void *params;
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u32 paramlen;
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bool key_is_private;
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const char *id_type;
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const char *pkey_algo;
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unsigned long key_eflags; /* key extension flags */
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#define KEY_EFLAG_CA 0 /* set if the CA basic constraints is set */
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#define KEY_EFLAG_DIGITALSIG 1 /* set if the digitalSignature usage is set */
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#define KEY_EFLAG_KEYCERTSIGN 2 /* set if the keyCertSign usage is set */
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};
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extern void public_key_free(struct public_key *key);
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/*
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* Public key cryptography signature data
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*/
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struct public_key_signature {
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struct asymmetric_key_id *auth_ids[3];
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u8 *s; /* Signature */
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u8 *digest;
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u32 s_size; /* Number of bytes in signature */
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u32 digest_size; /* Number of bytes in digest */
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const char *pkey_algo;
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const char *hash_algo;
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const char *encoding;
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const void *data;
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unsigned int data_size;
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};
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extern void public_key_signature_free(struct public_key_signature *sig);
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extern struct asymmetric_key_subtype public_key_subtype;
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struct key;
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struct key_type;
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union key_payload;
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extern int restrict_link_by_signature(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trust_keyring);
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extern int restrict_link_by_key_or_keyring(struct key *dest_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trusted);
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extern int restrict_link_by_key_or_keyring_chain(struct key *trust_keyring,
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const struct key_type *type,
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const union key_payload *payload,
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struct key *trusted);
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extern int query_asymmetric_key(const struct kernel_pkey_params *,
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struct kernel_pkey_query *);
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extern int encrypt_blob(struct kernel_pkey_params *, const void *, void *);
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extern int decrypt_blob(struct kernel_pkey_params *, const void *, void *);
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extern int create_signature(struct kernel_pkey_params *, const void *, void *);
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extern int verify_signature(const struct key *,
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const struct public_key_signature *);
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#if IS_REACHABLE(CONFIG_ASYMMETRIC_PUBLIC_KEY_SUBTYPE)
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int public_key_verify_signature(const struct public_key *pkey,
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const struct public_key_signature *sig);
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#else
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static inline
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int public_key_verify_signature(const struct public_key *pkey,
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const struct public_key_signature *sig)
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{
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return -EINVAL;
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}
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#endif
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#endif /* _LINUX_PUBLIC_KEY_H */
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