info.pppc.base.plugin.security.dh

Class ECDHExchange

java.lang.Object

info.pppc.base.plugin.security.dh.AbstractExchange

info.pppc.base.plugin.security.dh.ECDHExchange

public final class ECDHExchange
extends AbstractExchange

Creates a shared secret between two parties using ECC. Uses ECDH that is usually faster than the normal DHExchange.

Author:

Wolfgang Apolinarski

Field Summary

Fields inherited from class info.pppc.base.plugin.security.dh.AbstractExchange

PERFORM_ECDH, PERFORM_FAST_ECDH, PERFORM_NORMAL_DH

Method Summary

Methods

Modifier and Type	Method and Description
static AbstractExchange	createInstance()
byte[]	createLocalSecret() Creates the local secret (created as private value in this class).
byte[]	getSharedSecret(byte[] foreignPublicKey) Creates the shared secret out of the public BigInteger from the communication partner.

Methods inherited from class info.pppc.base.plugin.security.dh.AbstractExchange

createInstance, registerInstance

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

createInstance

public static AbstractExchange createInstance()

createLocalSecret

public byte[] createLocalSecret()

Creates the local secret (created as private value in this class).

Specified by:

createLocalSecret in class AbstractExchange

Returns:

An empty byte array, no need to transfer to the other communication endpoint.

getSharedSecret

public byte[] getSharedSecret(byte[] foreignPublicKey)
                       throws java.io.IOException

Description copied from class: AbstractExchange

Creates the shared secret out of the public BigInteger from the communication partner. The returned bytes can directly be transformed into a shared secret key.

Specified by:

getSharedSecret in class AbstractExchange

Parameters:

foreignPublicKey - The BigInteger that was obtained from the communication partner, i.e. the partners public key

Returns:

32 bytes that can directly be used to create a shared symmetric key.

Throws:

java.io.IOException