/* keys.h - Bluetooth key handling */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2) Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3) Neither the name of Intel Corporation nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if defined(CONFIG_BLUETOOTH_SMP)
enum {
	BT_KEYS_SLAVE_LTK      = (1 << 0),
	BT_KEYS_IRK            = (1 << 1),
	BT_KEYS_LTK            = (1 << 2),
	BT_KEYS_LOCAL_CSRK     = (1 << 3),
	BT_KEYS_REMOTE_CSRK    = (1 << 4),

	BT_KEYS_ALL            = (BT_KEYS_SLAVE_LTK | BT_KEYS_IRK | \
				  BT_KEYS_LTK | BT_KEYS_LOCAL_CSRK | \
				  BT_KEYS_REMOTE_CSRK),
};

enum {
	BT_KEYS_UNAUTHENTICATED,
	BT_KEYS_AUTHENTICATED,
};

struct bt_ltk {
	uint64_t		rand;
	uint16_t		ediv;
	uint8_t			val[16];
};

struct bt_irk {
	uint8_t			val[16];
	bt_addr_t		rpa;
};

struct bt_csrk {
	uint8_t			val[16];
	uint32_t		cnt;
};

struct bt_keys {
	bt_addr_le_t		addr;
	int			keys;
	uint8_t			type;

	struct bt_ltk		slave_ltk;
	struct bt_ltk		ltk;
	struct bt_irk		irk;
#if defined(CONFIG_BLUETOOTH_SIGNING)
	struct bt_csrk		local_csrk;
	struct bt_csrk		remote_csrk;
#endif /* BLUETOOTH_SIGNING */
};

struct bt_keys *bt_keys_get_addr(const bt_addr_le_t *addr);
struct bt_keys *bt_keys_get_type(int type, const bt_addr_le_t *addr);
void bt_keys_add_type(struct bt_keys *keys, int type);
void bt_keys_clear(struct bt_keys *keys, int type);
struct bt_keys *bt_keys_find(int type, const bt_addr_le_t *addr);
struct bt_keys *bt_keys_find_irk(const bt_addr_le_t *addr);
struct bt_keys *bt_keys_find_addr(const bt_addr_le_t *addr);
#else
static inline struct bt_keys *bt_keys_find_addr(const bt_addr_le_t *addr)
{
	return NULL;
}
#endif /* CONFIG_BLUETOOTH_SMP */