com.sshtools.ssh.components.jce

Class DiffieHellmanGroup14Sha1

java.lang.Object

com.sshtools.ssh.components.SshKeyExchangeClient

com.sshtools.ssh.components.jce.DiffieHellmanGroup14Sha1

All Implemented Interfaces:

AbstractKeyExchange, SshKeyExchange

public class DiffieHellmanGroup14Sha1
extends SshKeyExchangeClient
implements AbstractKeyExchange

An implementation of the diffie-hellman-group1-sha1 key exchange mechanism that uses JCE provider for DH agreement and Digest.

Author:

Lee David Painter

Field Summary

Fields

Modifier and Type	Field and Description
static String	DIFFIE_HELLMAN_GROUP14_SHA1 Constant for the algorithm name "diffie-hellman-group14-sha1".

Fields inherited from class com.sshtools.ssh.components.SshKeyExchangeClient

exchangeHash, hostKey, secret, signature, transport

Constructor Summary

Constructors

Constructor and Description
DiffieHellmanGroup14Sha1()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	calculateExchangeHash() Calculates the exchange hash as an SHA1 hash of the following data.
String	getAlgorithm() Get the key exchange algorithm name.
String	getProvider()
boolean	isKeyExchangeMessage(int messageid)
void	performClientExchange(String clientIdentification, String serverIdentification, byte[] clientKexInit, byte[] serverKexInit) Override to perform the client side key exchange.

Methods inherited from class com.sshtools.ssh.components.SshKeyExchangeClient

getExchangeHash, getHashAlgorithm, getHostKey, getSecret, getSignature, init, reset

Methods inherited from class java.lang.Object

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

Field Detail

DIFFIE_HELLMAN_GROUP14_SHA1

public static final String DIFFIE_HELLMAN_GROUP14_SHA1

Constant for the algorithm name "diffie-hellman-group14-sha1".

See Also:

Constant Field Values

Constructor Detail

DiffieHellmanGroup14Sha1

public DiffieHellmanGroup14Sha1()

Method Detail

performClientExchange

public void performClientExchange(String clientIdentification,
                         String serverIdentification,
                         byte[] clientKexInit,
                         byte[] serverKexInit)
                           throws SshException

Description copied from class: SshKeyExchangeClient

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

Specified by:

performClientExchange in class SshKeyExchangeClient

Throws:

SshException

getProvider

public String getProvider()

Specified by:

getProvider in interface AbstractKeyExchange

calculateExchangeHash

protected void calculateExchangeHash()
                              throws SshException

Calculates the exchange hash as an SHA1 hash of the following data.

  String         the client's version string (CR and NL excluded)
  String         the server's version string (CR and NL excluded)
  String         the payload of the client's SSH_MSG_KEXINIT
  String         the payload of the server's SSH_MSG_KEXINIT
  String         the host key
  BigInteger     e, exchange value sent by the client
  BigInteger     f, exchange value sent by the server
  BigInteger     K, the shared secret
 

Throws:

IOException

SshException

getAlgorithm

public String getAlgorithm()

Description copied from class: SshKeyExchangeClient

Get the key exchange algorithm name.

Specified by:

getAlgorithm in class SshKeyExchangeClient

Returns:

the key exchange algorithm.

isKeyExchangeMessage

public boolean isKeyExchangeMessage(int messageid)

Specified by:

isKeyExchangeMessage in class SshKeyExchangeClient