DHAgreement (Bouncy Castle Library 1.68 API Specification)

java.lang.Object
- org.bouncycastle.crypto.agreement.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.

Constructor Summary

Constructors
Constructor Description

DHAgreement()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.math.BigInteger`	`calculateAgreement(DHPublicKeyParameters pub, java.math.BigInteger message)`	given a message from a given party and the corresponding public key, calculate the next message in the agreement sequence.
`java.math.BigInteger`	`calculateMessage()`	calculate our initial message.
`void`	`init(CipherParameters param)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DHAgreement
```
public DHAgreement()
```
- Method Detail
  - init
```
public void init(CipherParameters param)
```
  - calculateMessage
```
public java.math.BigInteger calculateMessage()
```
    calculate our initial message.
  - calculateAgreement
```
public java.math.BigInteger calculateAgreement(DHPublicKeyParameters pub,
                                               java.math.BigInteger message)
```
    given a message from a given party and the corresponding public key, calculate the next message in the agreement sequence. In this case this will represent the shared secret.