Package com.sshtools.client.components

Class DiffieHellmanGroupExchange

java.lang.Object

com.sshtools.client.SshKeyExchangeClient

com.sshtools.client.components.DiffieHellmanGroupExchange

All Implemented Interfaces:

Component, SshComponent, SecureComponent, AbstractKeyExchange, SshKeyExchange<SshClientContext>

Direct Known Subclasses:

DiffieHellmanGroupExchangeSha1JCE, DiffieHellmanGroupExchangeSha256JCE

public abstract class DiffieHellmanGroupExchange
extends SshKeyExchangeClient
implements AbstractKeyExchange

Implementation of the required SSH Transport Protocol key exchange method "diffie-hellman-group-exchange-sha1".

Field Summary

Fields inherited from class com.sshtools.client.SshKeyExchangeClient

clientId, clientKexInit, exchangeHash, firstPacketFollows, hostKey, key, secret, serverId, serverKexInit, signature, transport, useFirstPacket

Constructor Summary

Constructors

Constructor	Description
DiffieHellmanGroupExchange(String kexAlgorithm, String hashAlgorithm, SecurityLevel securityLevel, int priority)	Construct an uninitialized instance.

Method Summary

Modifier and Type	Method	Description
protected void	calculateExchangeHash()	Calculates the exchange hash as an SHA1 hash of the following data.
boolean	exchangeGroup(com.sshtools.common.util.ByteArrayReader msg)
String	getAlgorithm()	Get the algorithm name for this key exchange
String	getProvider()
void	init(SshTransport<SshClientContext> transport, String clientIdentification, String serverIdentification, byte[] clientKexInit, byte[] serverKexInit, boolean firstPacketFollows, boolean useFirstPacket)
void	init(SshTransport<SshClientContext> transport, String clientId, String serverId, byte[] clientKexInit, byte[] serverKexInit, SshPrivateKey prvkey, SshPublicKey pubkey, boolean firstPacketFollows, boolean useFirstPacket)
boolean	isKeyExchangeMessage(int messageid)
boolean	processMessage(byte[] m)	Process a key exchange message
void	test()

Methods inherited from class com.sshtools.client.SshKeyExchangeClient

getExchangeHash, getHashAlgorithm, getHostKey, getPriority, getSecret, getSecurityLevel, getSignature, hasReceivedNewKeys, hasSentNewKeys, isComplete, reset, setReceivedNewKeys, setSentNewKeys

Methods inherited from class java.lang.Object

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

Constructor Details

DiffieHellmanGroupExchange

public DiffieHellmanGroupExchange(String kexAlgorithm,
 String hashAlgorithm,
 SecurityLevel securityLevel,
 int priority)

Construct an uninitialized instance.

Method Details

getAlgorithm

public String getAlgorithm()

Get the algorithm name for this key exchange

Specified by:

getAlgorithm in interface SecureComponent

Specified by:

getAlgorithm in interface SshComponent

Specified by:

getAlgorithm in interface SshKeyExchange<SshClientContext>

Returns:

"diffie-hellman-group1-sha1"

init

public void init(SshTransport<SshClientContext> transport,
 String clientIdentification,
 String serverIdentification,
 byte[] clientKexInit,
 byte[] serverKexInit,
 boolean firstPacketFollows,
 boolean useFirstPacket)
          throws IOException

Throws:

IOException

getProvider

public String getProvider()

Specified by:

getProvider in interface AbstractKeyExchange

Specified by:

getProvider in interface SshKeyExchange<SshClientContext>

exchangeGroup

public boolean exchangeGroup(com.sshtools.common.util.ByteArrayReader msg)
                      throws SshException,
IOException

Throws:

SshException

IOException

processMessage

public boolean processMessage(byte[] m)
                       throws SshException,
IOException

Description copied from class: SshKeyExchangeClient

Process a key exchange message

Specified by:

processMessage in interface SshKeyExchange<SshClientContext>

Specified by:

processMessage in class SshKeyExchangeClient

Returns:

boolean, indicating whether it has processed the message or not

Throws:

SshException

IOException

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
  UnsignedInteger32     min
  UnsignedInteger32     n
  UnsignedInteger32     max
  BigInteger    p
  BigInteger    g
  BigInteger     e, exchange value sent by the client
  BigInteger     f, exchange value sent by the server
  BigInteger     K, the shared secret
 

Overrides:

calculateExchangeHash in class SshKeyExchangeClient

Throws:

IOException

SshException

isKeyExchangeMessage

public boolean isKeyExchangeMessage(int messageid)

init

public void init(SshTransport<SshClientContext> transport,
 String clientId,
 String serverId,
 byte[] clientKexInit,
 byte[] serverKexInit,
 SshPrivateKey prvkey,
 SshPublicKey pubkey,
 boolean firstPacketFollows,
 boolean useFirstPacket)
          throws IOException,
SshException

Specified by:

init in interface SshKeyExchange<SshClientContext>

Throws:

IOException

SshException

test

public void test()
          throws IOException,
SshException

Specified by:

test in interface SshKeyExchange<SshClientContext>

Throws:

IOException

SshException