org.bouncycastle.crypto.agreement

Class DHAgreement


public class DHAgreement
extends java.lang.Object

a Diffie-Hellman key exchange engine.

note: This uses MTI/A0 key agreement in order to make the key agreement secure against passive attacks. If you're doing Diffie-Hellman and both parties have long term public keys you should look at using this. For further information have a look at RFC 2631.

It's possible to extend this to more than two parties as well, for the moment that is left as an exercise for the reader.

Method Summary

BigInteger
calculateAgreement(DHPublicKeyParameters pub, BigInteger message)
given a message from a given party and the coresponding public key calculate the next message in the agreement sequence.
BigInteger
calculateMessage()
calculate our initial message.
void
init(CipherParameters param)

Method Details

calculateAgreement

public BigInteger calculateAgreement(DHPublicKeyParameters pub,
                                     BigInteger message)
given a message from a given party and the coresponding public key calculate the next message in the agreement sequence. In this case this will represent the shared secret.


calculateMessage

public BigInteger calculateMessage()
calculate our initial message.


init

public void init(CipherParameters param)