gnu.crypto.key.dh
Class GnuDHKey

java.lang.Object
  |
  +--gnu.crypto.key.dh.GnuDHKey

All Implemented Interfaces:

DHKey, java.security.Key, java.io.Serializable

Direct Known Subclasses:

GnuDHPrivateKey, GnuDHPublicKey

public abstract class GnuDHKey

extends java.lang.Object

implements java.security.Key, DHKey

A base asbtract class for both public and private Diffie-Hellman keys. It encapsulates the two DH numbers: p, and g.

According to the JDK, cryptographic Keys all have a format. The format used in this implementation is called Raw, and basically consists of the raw byte sequences of algorithm parameters. The exact order of the byte sequences and the implementation details are given in each of the relevant getEncoded() methods of each of the private and public keys.

Reference:

1. Diffie-Hellman Key Agreement Method
   Eric Rescorla.

See Also:

Serialized Form

Field Summary

protected java.math.BigInteger	g The generator g.
protected java.math.BigInteger	p The public prime p.
protected java.math.BigInteger	q The public prime q.

Fields inherited from interface java.security.Key

serialVersionUID

Constructor Summary

protected

GnuDHKey(java.math.BigInteger q, java.math.BigInteger p, java.math.BigInteger g) Trivial protected constructor.

Method Summary

boolean	equals(java.lang.Object obj) Returns true if the designated object is an instance of DHKey and has the same Diffie-Hellman parameter values as this one.
java.lang.String	getAlgorithm()
java.lang.String	getFormat()
DHParameterSpec	getParams() Returns the key parameters.
java.math.BigInteger	getQ()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.security.Key

getEncoded

Field Detail

q

protected java.math.BigInteger q

The public prime q. A prime divisor of p-1.

p

protected java.math.BigInteger p

The public prime p.

g

protected java.math.BigInteger g

The generator g.

Constructor Detail

GnuDHKey

protected GnuDHKey(java.math.BigInteger q,
                   java.math.BigInteger p,
                   java.math.BigInteger g)

Trivial protected constructor.

Parameters:

q - a prime divisor of p-1.

p - the public prime.

g - the generator of the group.

Method Detail

getParams

public DHParameterSpec getParams()

Description copied from interface: DHKey

Returns the key parameters.

Specified by:

getParams in interface DHKey

Returns:

the key parameters

getAlgorithm

public java.lang.String getAlgorithm()

Specified by:

getAlgorithm in interface java.security.Key

getFormat

public java.lang.String getFormat()

Specified by:

getFormat in interface java.security.Key

getQ

public java.math.BigInteger getQ()

equals

public boolean equals(java.lang.Object obj)

Returns true if the designated object is an instance of DHKey and has the same Diffie-Hellman parameter values as this one.

Overrides:

equals in class java.lang.Object

Parameters:

obj - the other non-null DH key to compare to.

Returns:

true if the designated object is of the same type and value as this one.