com.sshtools.ssh.components

Class SshKeyExchangeClient

java.lang.Object

com.sshtools.ssh.components.SshKeyExchangeClient

All Implemented Interfaces:

SshKeyExchange

Direct Known Subclasses:

DiffieHellmanGroup14Sha1, DiffieHellmanGroup1Sha1, DiffieHellmanGroupExchangeSha1

public abstract class SshKeyExchangeClient
extends Object
implements SshKeyExchange

Abstract representation of an SSH key exchange.

Author:

Lee David Painter

Field Summary

Fields

Modifier and Type	Field and Description
protected byte[]	exchangeHash The exchange hash produced during key exchange.
protected byte[]	hostKey The server's host key.
protected BigInteger	secret The secret value produced during key exchange.
protected byte[]	signature The signature generated over the exchange hash
protected TransportProtocol	transport The transport protocol for sending/receiving messages

Constructor Summary

Constructors

Modifier	Constructor and Description
	SshKeyExchangeClient() Contruct an uninitialized key exchange
protected	SshKeyExchangeClient(String hashAlgorithm)

Method Summary

Methods

Modifier and Type	Method and Description
abstract String	getAlgorithm() Get the key exchange algorithm name.
byte[]	getExchangeHash() Get the output of the key exchange
String	getHashAlgorithm()
byte[]	getHostKey() Get the host key supplied during key exchange.
BigInteger	getSecret() Get the secret value produced during key exchange.
byte[]	getSignature() Get the signature produced during key exchange.
void	init(TransportProtocol transport, boolean ignoreFirstPacket) Initialize the key exchange.
abstract boolean	isKeyExchangeMessage(int messageid)
abstract void	performClientExchange(String clientId, String serverId, byte[] clientKexInit, byte[] serverKexInit) Override to perform the client side key exchange.
void	reset() Reset the key exchange.

Methods inherited from class java.lang.Object

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

Field Detail

secret

protected BigInteger secret

The secret value produced during key exchange.

exchangeHash

protected byte[] exchangeHash

The exchange hash produced during key exchange.

hostKey

protected byte[] hostKey

The server's host key.

signature

protected byte[] signature

The signature generated over the exchange hash

transport

protected TransportProtocol transport

The transport protocol for sending/receiving messages

Constructor Detail

SshKeyExchangeClient

protected SshKeyExchangeClient(String hashAlgorithm)

SshKeyExchangeClient

public SshKeyExchangeClient()

Contruct an uninitialized key exchange

Method Detail

getAlgorithm

public abstract String getAlgorithm()

Get the key exchange algorithm name.

Returns:

the key exchange algorithm.

getExchangeHash

public byte[] getExchangeHash()

Get the output of the key exchange

Returns:

the exchange hash output.

getHostKey

public byte[] getHostKey()

Get the host key supplied during key exchange.

Returns:

the server's host key

getSecret

public BigInteger getSecret()

Get the secret value produced during key exchange.

Returns:

The secret value producted during key exchange

getSignature

public byte[] getSignature()

Get the signature produced during key exchange.

Returns:

the signature produced from the exchange hash.

getHashAlgorithm

public String getHashAlgorithm()

init

public void init(TransportProtocol transport,
        boolean ignoreFirstPacket)

Initialize the key exchange.

Parameters:

transport -

Throws:

IOException

performClientExchange

public abstract void performClientExchange(String clientId,
                         String serverId,
                         byte[] clientKexInit,
                         byte[] serverKexInit)
                                    throws SshException

Override to perform the client side key exchange. The implementation should not return until all messages have been sent.

Parameters:

clientId -

serverId -

clientKexInit -

serverKexInit -

Throws:

IOException

SshException

isKeyExchangeMessage

public abstract boolean isKeyExchangeMessage(int messageid)

reset

public void reset()

Reset the key exchange.