com.sshtools.server.components.jce

Class DiffieHellmanGroupExchangeSha1JCE

java.lang.Object

com.sshtools.server.components.SshKeyExchangeServer

com.sshtools.server.components.jce.DiffieHellmanGroupExchangeSha1JCE

All Implemented Interfaces:

AbstractKeyExchange, SshKeyExchange<SshServerContext>

Direct Known Subclasses:

DiffieHellmanGroupExchangeSha256JCE

public class DiffieHellmanGroupExchangeSha1JCE
extends SshKeyExchangeServer
implements AbstractKeyExchange

Field Summary

Fields

Modifier and Type	Field and Description
static String	DIFFIE_HELLMAN_GROUP_EXCHANGE_SHA1 Constant for the algorithm name "diffie-hellman-group1-sha1".

Fields inherited from class com.sshtools.server.components.SshKeyExchangeServer

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

Constructor Summary

Constructors

Constructor and Description
DiffieHellmanGroupExchangeSha1JCE() Construct an uninitialized instance.
DiffieHellmanGroupExchangeSha1JCE(String hashAlgorithm)

Method Summary

Modifier and Type	Method and Description
protected void	calculateExchangeHash() Calculates the exchange hash as an SHA1 hash of the following data.
boolean	exchangeGroup(byte[] msg)
String	getAlgorithm() Get the algorithm name for this key exchange
String	getProvider()
void	init(TransportProtocol<SshServerContext> 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

Methods inherited from class com.sshtools.server.components.SshKeyExchangeServer

getExchangeHash, getHashAlgorithm, getHostKey, getSecret, getSignature, hasReceivedNewKeys, hasSentNewKeys, reset, setReceivedNewKeys, setSentNewKeys, test

Methods inherited from class java.lang.Object

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

Field Detail

DIFFIE_HELLMAN_GROUP_EXCHANGE_SHA1

public static final String DIFFIE_HELLMAN_GROUP_EXCHANGE_SHA1

Constant for the algorithm name "diffie-hellman-group1-sha1".

See Also:

Constant Field Values

Constructor Detail

DiffieHellmanGroupExchangeSha1JCE

public DiffieHellmanGroupExchangeSha1JCE()

Construct an uninitialized instance.

DiffieHellmanGroupExchangeSha1JCE

public DiffieHellmanGroupExchangeSha1JCE(String hashAlgorithm)

Method Detail

getAlgorithm

public String getAlgorithm()

Get the algorithm name for this key exchange

Specified by:

getAlgorithm in interface SshKeyExchange<SshServerContext>

Specified by:

getAlgorithm in class SshKeyExchangeServer

Returns:

"diffie-hellman-group1-sha1"

init

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

Specified by:

init in interface SshKeyExchange<SshServerContext>

Throws:

IOException

getProvider

public String getProvider()

Specified by:

getProvider in interface AbstractKeyExchange

exchangeGroup

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

Throws:

SshException

IOException

processMessage

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

Description copied from class: SshKeyExchangeServer

Process a key exchange message

Specified by:

processMessage in interface SshKeyExchange<SshServerContext>

Specified by:

processMessage in class SshKeyExchangeServer

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
 

Throws:

IOException

SshException