Commit 05ddb47a authored by Johan Hedberg's avatar Johan Hedberg Committed by Marcel Holtmann
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Bluetooth: Add ECC library for LE Secure Connections 

This patch adds a simple ECC library that will act as a fundamental
building block for LE Secure Connections. The library has a simple API
consisting of two functions: one for generating a public/private key
pair and another one for generating a Diffie-Hellman key from a local
private key and a remote public key.

The code has been taken from https://github.com/kmackay/easy-ecc

 and
modified to conform with the kernel coding style.

Signed-off-by: default avatarJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 407cecf6

net/bluetooth/Makefile

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@@ -13,6 +13,6 @@ bluetooth_6lowpan-y := 6lowpan.o 


bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \

	hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o sco.o lib.o \

	a2mp.o amp.o

	a2mp.o amp.o ecc.o



subdir-ccflags-y += -D__CHECK_ENDIAN__

net/bluetooth/ecc.c

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File added.

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net/bluetooth/ecc.h

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/*

 * Copyright (c) 2013, Kenneth MacKay

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are

 * met:

 *  * Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 *  * 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.

 *

 * 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.

 */



/* Create a public/private key pair.

 * Outputs:

 *	public_key  - Will be filled in with the public key.

 *	private_key - Will be filled in with the private key.

 *

 * Returns true if the key pair was generated successfully, false

 * if an error occurred. The keys are with the LSB first.

 */

bool ecc_make_key(u8 public_key[64], u8 private_key[32]);



/* Compute a shared secret given your secret key and someone else's

 * public key.

 * Note: It is recommended that you hash the result of ecdh_shared_secret

 * before using it for symmetric encryption or HMAC.

 *

 * Inputs:

 *	public_key  - The public key of the remote party

 *	private_key - Your private key.

 *

 * Outputs:

 *	secret - Will be filled in with the shared secret value.

 *

 * Returns true if the shared secret was generated successfully, false

 * if an error occurred. Both input and output parameters are with the

 * LSB first.

 */

bool ecdh_shared_secret(const u8 public_key[64], const u8 private_key[32],

		        u8 secret[32]);