mirror of
https://github.com/torvalds/linux.git
synced 2024-12-04 18:13:04 +00:00
3b76456317
Allow authentication data to be stored in an asymmetric key in the 4th element of the key payload and provide a way for it to be destroyed. For the public key subtype, this will be a public_key_signature struct. Signed-off-by: David Howells <dhowells@redhat.com>
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/* Asymmetric Public-key cryptography key type interface
|
|
*
|
|
* See Documentation/security/asymmetric-keys.txt
|
|
*
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _KEYS_ASYMMETRIC_TYPE_H
|
|
#define _KEYS_ASYMMETRIC_TYPE_H
|
|
|
|
#include <linux/key-type.h>
|
|
|
|
extern struct key_type key_type_asymmetric;
|
|
|
|
/*
|
|
* The key payload is four words. The asymmetric-type key uses them as
|
|
* follows:
|
|
*/
|
|
enum asymmetric_payload_bits {
|
|
asym_crypto, /* The data representing the key */
|
|
asym_subtype, /* Pointer to an asymmetric_key_subtype struct */
|
|
asym_key_ids, /* Pointer to an asymmetric_key_ids struct */
|
|
asym_auth /* The key's authorisation (signature, parent key ID) */
|
|
};
|
|
|
|
/*
|
|
* Identifiers for an asymmetric key ID. We have three ways of looking up a
|
|
* key derived from an X.509 certificate:
|
|
*
|
|
* (1) Serial Number & Issuer. Non-optional. This is the only valid way to
|
|
* map a PKCS#7 signature to an X.509 certificate.
|
|
*
|
|
* (2) Issuer & Subject Unique IDs. Optional. These were the original way to
|
|
* match X.509 certificates, but have fallen into disuse in favour of (3).
|
|
*
|
|
* (3) Auth & Subject Key Identifiers. Optional. SKIDs are only provided on
|
|
* CA keys that are intended to sign other keys, so don't appear in end
|
|
* user certificates unless forced.
|
|
*
|
|
* We could also support an PGP key identifier, which is just a SHA1 sum of the
|
|
* public key and certain parameters, but since we don't support PGP keys at
|
|
* the moment, we shall ignore those.
|
|
*
|
|
* What we actually do is provide a place where binary identifiers can be
|
|
* stashed and then compare against them when checking for an id match.
|
|
*/
|
|
struct asymmetric_key_id {
|
|
unsigned short len;
|
|
unsigned char data[];
|
|
};
|
|
|
|
struct asymmetric_key_ids {
|
|
void *id[2];
|
|
};
|
|
|
|
extern bool asymmetric_key_id_same(const struct asymmetric_key_id *kid1,
|
|
const struct asymmetric_key_id *kid2);
|
|
|
|
extern bool asymmetric_key_id_partial(const struct asymmetric_key_id *kid1,
|
|
const struct asymmetric_key_id *kid2);
|
|
|
|
extern struct asymmetric_key_id *asymmetric_key_generate_id(const void *val_1,
|
|
size_t len_1,
|
|
const void *val_2,
|
|
size_t len_2);
|
|
static inline
|
|
const struct asymmetric_key_ids *asymmetric_key_ids(const struct key *key)
|
|
{
|
|
return key->payload.data[asym_key_ids];
|
|
}
|
|
|
|
/*
|
|
* The payload is at the discretion of the subtype.
|
|
*/
|
|
|
|
#endif /* _KEYS_ASYMMETRIC_TYPE_H */
|