ch.ethz.ssh2
Class DHGexParameters

java.lang.Object
  ch.ethz.ssh2.DHGexParameters

public class DHGexParameters

extends java.lang.Object

A DHGexParameters object can be used to specify parameters for the diffie-hellman group exchange.

Depending on which constructor is used, either the use of a SSH_MSG_KEX_DH_GEX_REQUEST or SSH_MSG_KEX_DH_GEX_REQUEST_OLD can be forced.

Version:

$Id: DHGexParameters.java,v 1.3 2006/09/20 12:51:37 cplattne Exp $

Author:

Christian Plattner, plattner@inf.ethz.ch

See Also:

Connection.setDHGexParameters(DHGexParameters)

Constructor Summary

DHGexParameters()
Same as calling DHGexParameters(1024, 1024, 4096).

DHGexParameters(int pref_group_len)
This constructor can be used to force the sending of a SSH_MSG_KEX_DH_GEX_REQUEST_OLD request.

DHGexParameters(int min_group_len, int pref_group_len, int max_group_len)
This constructor can be used to force the sending of a SSH_MSG_KEX_DH_GEX_REQUEST request.

Method Summary

int	getMax_group_len() Get the maximum group length.
int	getMin_group_len() Get the minimum group length.
int	getPref_group_len() Get the preferred group length.

Methods inherited from class java.lang.Object

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

Constructor Detail

DHGexParameters

public DHGexParameters()

Same as calling DHGexParameters(1024, 1024, 4096). This is also the default used by the Connection class.

DHGexParameters

public DHGexParameters(int pref_group_len)

This constructor can be used to force the sending of a SSH_MSG_KEX_DH_GEX_REQUEST_OLD request. Internally, the minimum and maximum group lengths will be set to zero.

Parameters:

pref_group_len - has to be >= 1024 and <= 8192

DHGexParameters

public DHGexParameters(int min_group_len,
                       int pref_group_len,
                       int max_group_len)

This constructor can be used to force the sending of a SSH_MSG_KEX_DH_GEX_REQUEST request.

Note: older OpenSSH servers don't understand this request, in which case you should use the DHGexParameters(int) constructor.

All values have to be >= 1024 and <= 8192. Furthermore, min_group_len <= pref_group_len <= max_group_len.

Parameters:

min_group_len -

pref_group_len -

max_group_len -

Method Detail

getMax_group_len

public int getMax_group_len()

Get the maximum group length.

Returns:

the maximum group length, may be zero if SSH_MSG_KEX_DH_GEX_REQUEST_OLD should be requested

getMin_group_len

public int getMin_group_len()

Get the minimum group length.

Returns:

minimum group length, may be zero if SSH_MSG_KEX_DH_GEX_REQUEST_OLD should be requested

getPref_group_len

public int getPref_group_len()

Get the preferred group length.

Returns:

the preferred group length