com.maverick.sshd.components.jce.server

Class DiffieHellmanGroup

java.lang.Object

com.maverick.sshd.components.SshKeyExchangeServer

com.maverick.sshd.components.jce.server.DiffieHellmanGroup

All Implemented Interfaces:

AbstractKeyExchange, SshComponent, SshKeyExchange, SecureComponent

Direct Known Subclasses:

DiffieHellmanGroup14Sha256JCE, DiffieHellmanGroup15Sha512JCE, DiffieHellmanGroup16Sha512JCE, DiffieHellmanGroup17Sha512JCE, DiffieHellmanGroup18Sha512JCE

public class DiffieHellmanGroup
extends SshKeyExchangeServer
implements AbstractKeyExchange

Implementation of the required SSH Transport Protocol key exchange method "diffie-hellman-group1-sha1".

Author:

Lee David Painter

Field Summary

Fields inherited from class com.maverick.sshd.components.SshKeyExchangeServer

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

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DiffieHellmanGroup(String algorithmName, String hashAlgorithm, BigInteger group, SecurityLevel securityLevel, int priority) Construct an uninitialized instance.

Method Summary

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 algorithm name for this key exchange
String	getProvider()
void	init(AbstractServerTransport transport, String clientIdentification, String serverIdentification, byte[] clientKexInit, byte[] serverKexInit, SshPrivateKey prvkey, SshPublicKey pubkey, boolean firstPacketFollows, boolean useFirstPacket)
boolean	processMessage(byte[] msg) Process a key exchange message
void	test()

Methods inherited from class com.maverick.sshd.components.SshKeyExchangeServer

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

Methods inherited from class java.lang.Object

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

Constructor Detail

DiffieHellmanGroup

protected DiffieHellmanGroup(String algorithmName,
                             String hashAlgorithm,
                             BigInteger group,
                             SecurityLevel securityLevel,
                             int priority)

Construct an uninitialized instance.

Method Detail

getAlgorithm

public String getAlgorithm()

Get the algorithm name for this key exchange

Specified by:

getAlgorithm in interface SshComponent

Specified by:

getAlgorithm in interface SecureComponent

Specified by:

getAlgorithm in class SshKeyExchangeServer

Returns:

"diffie-hellman-group1-sha1"

test

public void test()

Specified by:

test in interface SshKeyExchange

init

public void init(AbstractServerTransport transport,
                 String clientIdentification,
                 String serverIdentification,
                 byte[] clientKexInit,
                 byte[] serverKexInit,
                 SshPrivateKey prvkey,
                 SshPublicKey pubkey,
                 boolean firstPacketFollows,
                 boolean useFirstPacket)
          throws IOException

Specified by:

init in class SshKeyExchangeServer

Throws:

IOException

getProvider

public String getProvider()

Specified by:

getProvider in interface AbstractKeyExchange

Specified by:

getProvider in interface SshKeyExchange

processMessage

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

Description copied from class: SshKeyExchangeServer

Process a key exchange message

Specified by:

processMessage in class SshKeyExchangeServer

Returns:

boolean, indicating whether it has processed the message or not

Throws:

IOException

SshException

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