/* keys.h - Bluetooth key handling */

/*
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#if defined(CONFIG_BLUETOOTH_SMP)
enum {
	BT_KEYS_SLAVE_LTK      = BIT(0),
	BT_KEYS_IRK            = BIT(1),
	BT_KEYS_LTK            = BIT(2),
	BT_KEYS_LOCAL_CSRK     = BIT(3),
	BT_KEYS_REMOTE_CSRK    = BIT(4),
	BT_KEYS_LTK_P256       = BIT(5),

	BT_KEYS_ALL            = (BT_KEYS_SLAVE_LTK | BT_KEYS_IRK | \
				  BT_KEYS_LTK | BT_KEYS_LOCAL_CSRK | \
				  BT_KEYS_REMOTE_CSRK | BT_KEYS_LTK_P256),
};

enum {
	BT_KEYS_AUTHENTICATED,
	BT_KEYS_DEBUG,

	/* Total number of flags - must be at the end of the enum */
	BT_KEYS_NUM_FLAGS,
};

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;
	uint8_t			enc_size;
	ATOMIC_DEFINE(flags, BT_KEYS_NUM_FLAGS);
	uint16_t		keys;
	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 */
#if !defined(CONFIG_BLUETOOTH_SMP_SC_ONLY)
	struct bt_ltk		slave_ltk;
#endif /* CONFIG_BLUETOOTH_SMP_SC_ONLY */
};

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);
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);

void bt_keys_add_type(struct bt_keys *keys, int type);
void bt_keys_clear(struct bt_keys *keys);
#endif /* CONFIG_BLUETOOTH_SMP */

#if defined(CONFIG_BLUETOOTH_BREDR)
enum {
	BT_LINK_KEY_AUTHENTICATED,
	BT_LINK_KEY_DEBUG,
	BT_LINK_KEY_SC,

	/* Total number of flags - must be at the end of the enum */
	BT_LINK_KEY_NUM_FLAGS,
};

struct bt_keys_link_key {
	bt_addr_t		addr;
	ATOMIC_DEFINE(flags, BT_LINK_KEY_NUM_FLAGS);
	uint8_t			val[16];
};

struct bt_keys_link_key *bt_keys_get_link_key(const bt_addr_t *addr);
struct bt_keys_link_key *bt_keys_find_link_key(const bt_addr_t *addr);
void bt_keys_link_key_clear(struct bt_keys_link_key *link_key);
#endif /* CONFIG_BLUETOOTH_BREDR */