/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 * Module signature handling.
 *
 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#ifndef _UAPI_LINUX_MODULE_SIGNATURE_H
#define _UAPI_LINUX_MODULE_SIGNATURE_H

#include <linux/types.h>

/* In stripped ARM and x86-64 modules, ~ is surprisingly rare. */
#define MODULE_SIGNATURE_MARKER "~Module signature appended~\n"

enum module_signature_type {
        MODULE_SIGNATURE_TYPE_PKCS7 = 2,        /* Signature in PKCS#7 message */
};

/*
 * Module signature information block.
 *
 * The constituents of the signature section are, in order:
 *
 *      - Signer's name
 *      - Key identifier
 *      - Signature data
 *      - Information block
 */
struct module_signature {
        __u8    algo;           /* Public-key crypto algorithm [0] */
        __u8    hash;           /* Digest algorithm [0] */
        __u8    id_type;        /* Key identifier type [enum module_signature_type] */
        __u8    signer_len;     /* Length of signer's name [0] */
        __u8    key_id_len;     /* Length of key identifier [0] */
        __u8    __pad[3];
        __be32  sig_len;        /* Length of signature data */
};

#endif /* _UAPI_LINUX_MODULE_SIGNATURE_H */