/* 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 (dhowells@redhat.com)
 */

#ifndef _KEYS_ASYMMETRIC_SUBTYPE_H
#define _KEYS_ASYMMETRIC_SUBTYPE_H

#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->payload.data[asym_subtype];
}

#endif /* _KEYS_ASYMMETRIC_SUBTYPE_H */