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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Asymmetric public-key cryptography key subtype
* See Documentation/crypto/asymmetric-keys.rst
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (
#include <linux/seq_file.h>
#include <keys/asymmetric-type.h>
struct kernel_pkey_query;
struct kernel_pkey_params;
struct public_key_signature;
* Keys of this type declare a subtype that indicates the handlers and
* capabilities.
struct asymmetric_key_subtype {
struct module *owner;
const char *name;
unsigned short name_len; /* length of name */
/* Describe a key of this subtype for /proc/keys */
void (*describe)(const struct key *key, struct seq_file *m);
/* Destroy a key of this subtype */
void (*destroy)(void *payload_crypto, void *payload_auth);
int (*query)(const struct kernel_pkey_params *params,
struct kernel_pkey_query *info);
/* Encrypt/decrypt/sign data */
int (*eds_op)(struct kernel_pkey_params *params,
const void *in, void *out);
/* Verify the signature on a key of this subtype (optional) */
int (*verify_signature)(const struct key *key,
const struct public_key_signature *sig);
* asymmetric_key_subtype - Get the subtype from an asymmetric key
* @key: The key of interest.
* Retrieves and returns the subtype pointer of the asymmetric key from the
* type-specific data attached to the key.
static inline
struct asymmetric_key_subtype *asymmetric_key_subtype(const struct key *key)
return key->[asym_subtype];