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/usr/include/Limba/li-keyring.h is in liblimba-dev 0.5.6-1.

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The actual contents of the file can be viewed below.

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2014-2016 Matthias Klumpp <matthias@tenstral.net>
 *
 * Licensed under the GNU Lesser General Public License Version 2.1
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 2.1 of the license, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#if !defined (__LIMBA_H) && !defined (LI_COMPILATION)
#error "Only <limba.h> can be included directly."
#endif

#ifndef __LI_KEYRING_H
#define __LI_KEYRING_H

#include <glib-object.h>
#include "li-package.h"

G_BEGIN_DECLS

#define LI_TYPE_KEYRING (li_keyring_get_type ())
G_DECLARE_DERIVABLE_TYPE (LiKeyring, li_keyring, LI, KEYRING, GObject)

struct _LiKeyringClass
{
	GObjectClass		parent_class;
	/*< private >*/
	void (*_as_reserved1)	(void);
	void (*_as_reserved2)	(void);
	void (*_as_reserved3)	(void);
	void (*_as_reserved4)	(void);
	void (*_as_reserved5)	(void);
	void (*_as_reserved6)	(void);
	void (*_as_reserved7)	(void);
	void (*_as_reserved8)	(void);
};

/**
 * LiKeyringKind:
 * @LI_KEYRING_KIND_NONE:	No specific keyring should be used.
 * @LI_KEYRING_KIND_ALL:	Use all keyrings.
 * @LI_KEYRING_KIND_VENDOR:	Use the vendor keyring, containing explicitly trusted keys by the distribution vendor.
 * @LI_KEYRING_KIND_EXTRA:	Use the extra keyring, containing manually trusted keys by the user.
 *
 * Type of the keyring to validate against.
 **/
typedef enum {
	LI_KEYRING_KIND_NONE,
	LI_KEYRING_KIND_ALL,
	LI_KEYRING_KIND_VENDOR,
	LI_KEYRING_KIND_EXTRA,
	/*< private >*/
	LI_KEYRING_LAST
} LiKeyringKind;

/**
 * LiKeyringError:
 * @LI_KEYRING_ERROR_FAILED:		Generic failure
 * @LI_KEYRING_ERROR_SCAN:		Looking for keys has failed.
 * @LI_KEYRING_ERROR_IMPORT:		Importing of a key failed
 * @LI_KEYRING_ERROR_LOOKUP:		An error occured while looking up a key
 * @LI_KEYRING_ERROR_KEY_UNKNOWN: 	The key we are dealing with is unknown
 * @LI_KEYRING_ERROR_VERIFY:		Verification failed
 * @LI_KEYRING_ERROR_KEY_MISSING:	A (public) key is missing to complete the validation.
 *
 * The error type.
 **/
typedef enum {
	LI_KEYRING_ERROR_FAILED,
	LI_KEYRING_ERROR_SCAN,
	LI_KEYRING_ERROR_IMPORT,
	LI_KEYRING_ERROR_LOOKUP,
	LI_KEYRING_ERROR_KEY_UNKNOWN,
	LI_KEYRING_ERROR_VERIFY,
	LI_KEYRING_ERROR_KEY_MISSING,
	/*< private >*/
	LI_KEYRING_ERROR_LAST
} LiKeyringError;

#define	LI_KEYRING_ERROR li_keyring_error_quark ()
GQuark li_keyring_error_quark (void);

LiKeyring		*li_keyring_new (void);

gboolean		li_keyring_add_key (LiKeyring *kr,
						const gchar *fpr,
						GError **error);
gboolean		li_keyring_add_key_file (LiKeyring *kr,
							const gchar *fname,
							GError **error);
gboolean		li_keyring_refresh_keys (LiKeyring *kr,
							GError **error);

gchar			*li_keyring_verify_clear_signature (LiKeyring *kr,
							LiKeyringKind kind,
							const gchar *sigtext,
							gchar **out_fpr,
							GError **error);
LiTrustLevel		li_keyring_process_signature (LiKeyring *kr,
					const gchar *sigtext,
					gchar **out_data,
					gchar **out_fpr,
					GError **error);

G_END_DECLS

#endif /* __LI_KEYRING_H */