com.jcraft.jsch

Class DHG14

java.lang.Object

com.jcraft.jsch.KeyExchange

com.jcraft.jsch.DHG14

public class DHG14
extends KeyExchange

Usually not to be used by applications. Implements the key exchange method diffie-hellman-group1-sha1, using the Oakley Group 14. For the actual cryptographic calculations we delegate to an implementation of DH.

See Also:

RFC 4253, section 8. Diffie-Hellman Key Exchange, RFC 3526, section 3. 2048-bit MODP Group

Field Summary

Fields inherited from class com.jcraft.jsch.KeyExchange

DSS, ECDSA, H, K, K_S, RSA, session, sha, STATE_END

Constructor Summary

Constructors

Constructor and Description
DHG14()

Method Summary

Modifier and Type	Method and Description
int	getState() returns the identifier of the next SSH packet expected, or KeyExchange.STATE_END if the KeyExchange was already successfully finished.
void	init(Session session, byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C) Initializes the key exchange object.
boolean	next(Buffer _buf) Does the next step in the key exchange algorithm.

Methods inherited from class com.jcraft.jsch.KeyExchange

getFingerPrint, getKeyAlgorithName, getKeyType, guess, normalize, verify

Methods inherited from class java.lang.Object

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

Constructor Detail

DHG14

public DHG14()

Method Detail

init

public void init(Session session,
                 byte[] V_S,
                 byte[] V_C,
                 byte[] I_S,
                 byte[] I_C)
          throws Exception

Description copied from class: KeyExchange

Initializes the key exchange object. The parameters here seem to be specific to the Diffie-Hellman Key exchange specified by RFC 4253, other Key Exchange mechanisms might need other parameters.

Specified by:

init in class KeyExchange

Parameters:

session - the session object.

V_S - the server's identification string sent before negotiation

V_C - the client's identification string sent before negotiation

I_S - the server's complete SSH_MSG_KEXINIT message.

I_C - the server's complete SSH_MSG_KEXINIT message.

Throws:

Exception

See Also:

RFC 4253, 7. Key Exchange, RFC 4253, 8. Diffie-Hellman Key Exchange

next

public boolean next(Buffer _buf)
             throws Exception

Description copied from class: KeyExchange

Does the next step in the key exchange algorithm.

Specified by:

next in class KeyExchange

Parameters:

_buf - the received packet. It will have the same message-type as KeyExchange.getState() returned before.

Returns:

false if there was some problem, true if everything was okay.

Throws:

Exception

getState

public int getState()

Description copied from class: KeyExchange

returns the identifier of the next SSH packet expected, or KeyExchange.STATE_END if the KeyExchange was already successfully finished.

Specified by:

getState in class KeyExchange