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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2011-2014 Intel Corporation
* Copyright (C) 2002-2010 Marcel Holtmann <marcel@holtmann.org>
*
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "src/shared/util.h"
#include "src/shared/queue.h"
#include "src/shared/crypto.h"
#include "keys.h"
static const uint8_t empty_key[16] = { 0x00, };
static const uint8_t empty_addr[6] = { 0x00, };
static struct bt_crypto *crypto;
struct irk_data {
uint8_t key[16];
uint8_t addr[6];
uint8_t addr_type;
};
static struct queue *irk_list;
void keys_setup(void)
{
crypto = bt_crypto_new();
irk_list = queue_new();
}
void keys_cleanup(void)
{
bt_crypto_unref(crypto);
queue_destroy(irk_list, free);
}
void keys_update_identity_key(const uint8_t key[16])
{
struct irk_data *irk;
irk = queue_peek_tail(irk_list);
if (irk && !memcmp(irk->key, empty_key, 16)) {
memcpy(irk->key, key, 16);
return;
}
irk = new0(struct irk_data, 1);
if (irk) {
memcpy(irk->key, key, 16);
if (!queue_push_tail(irk_list, irk))
free(irk);
}
}
void keys_update_identity_addr(const uint8_t addr[6], uint8_t addr_type)
{
struct irk_data *irk;
irk = queue_peek_tail(irk_list);
if (irk && !memcmp(irk->addr, empty_addr, 6)) {
memcpy(irk->addr, addr, 6);
irk->addr_type = addr_type;
return;
}
irk = new0(struct irk_data, 1);
if (irk) {
memcpy(irk->addr, addr, 6);
irk->addr_type = addr_type;
if (!queue_push_tail(irk_list, irk))
free(irk);
}
}
struct resolve_data {
bool found;
uint8_t addr[6];
uint8_t ident[6];
uint8_t ident_type;
};
static void try_resolve_irk(void *data, void *user_data)
{
struct irk_data *irk = data;
struct resolve_data *result = user_data;
uint8_t local_hash[3];
if (result->found)
return;
bt_crypto_ah(crypto, irk->key, result->addr + 3, local_hash);
if (!memcmp(result->addr, local_hash, 3)) {
result->found = true;
memcpy(result->ident, irk->addr, 6);
result->ident_type = irk->addr_type;
}
}
bool keys_resolve_identity(const uint8_t addr[6], uint8_t ident[6],
uint8_t *ident_type)
{
struct resolve_data result;
result.found = false;
memcpy(result.addr, addr, 6);
queue_foreach(irk_list, try_resolve_irk, &result);
if (result.found) {
memcpy(ident, result.ident, 6);
*ident_type = result.ident_type;
return true;
}
return false;
}
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