cryptix.provider.elgamal
Class BaseElGamalPrivateKey

java.lang.Object
  |
  +--cryptix.provider.elgamal.BaseElGamalPublicKey
        |
        +--cryptix.provider.elgamal.BaseElGamalPrivateKey
All Implemented Interfaces:
ElGamalKey, ElGamalPrivateKey, ElGamalPublicKey, java.security.Key, java.security.PrivateKey, java.security.PublicKey, java.io.Serializable

public class BaseElGamalPrivateKey
extends BaseElGamalPublicKey
implements ElGamalPrivateKey

A class representing an ElGamal private key. This can also act as an ElGamal public key. It is called BaseElGamalPrivateKey to distinguish it from the interface ElGamalPrivateKey, without having to use fully-qualified names.

References:

  1. Bruce Schneier, "Section 19.6 ElGamal," Applied Cryptography, 2nd Edition, John Wiley & Sons, 1996.

  2. IEEE P1363 draft standard, http://stdsbbs.ieee.org/groups/1363/index.html

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.2 $

Since:
Cryptix 2.2.2
Author:
David Hopwood
See Also:
ElGamalKey, java.security.Cipher, Signature, Serialized Form

Field Summary
protected  java.math.BigInteger x
           
 
Fields inherited from class cryptix.provider.elgamal.BaseElGamalPublicKey
g, p, y
 
Fields inherited from interface java.security.PrivateKey
serialVersionUID
 
Fields inherited from interface java.security.PublicKey
serialVersionUID
 
Constructor Summary
  BaseElGamalPrivateKey(java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger x)
          Constructs a BaseElGamalPrivateKey with the specified prime p, base g, and private value x.
  BaseElGamalPrivateKey(java.math.BigInteger p, java.math.BigInteger g, java.math.BigInteger x, java.math.BigInteger y)
          Constructs a BaseElGamalPrivateKey with the specified prime p, base g, private value x, and pre-calculated public value y = gx mod p.
protected BaseElGamalPrivateKey(ElGamalParams params, java.math.BigInteger x)
          Constructs a BaseElGamalPublicKey with a prime and base taken from an object implementing java.security.interfaces.ElGamalParams, and the specified private value x.
 
Method Summary
 java.math.BigInteger getX()
          Returns the value of x (the private key).
 
Methods inherited from class cryptix.provider.elgamal.BaseElGamalPublicKey
getAlgorithm, getEncoded, getFormat, getG, getP, getY
 
Methods inherited from class java.lang.Object
, clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface xjava.security.interfaces.ElGamalKey
getG, getP, getY
 
Methods inherited from interface java.security.Key
getAlgorithm, getEncoded, getFormat
 

Field Detail

x

protected java.math.BigInteger x
Constructor Detail

BaseElGamalPrivateKey

public BaseElGamalPrivateKey(java.math.BigInteger p,
                             java.math.BigInteger g,
                             java.math.BigInteger x,
                             java.math.BigInteger y)
Constructs a BaseElGamalPrivateKey with the specified prime p, base g, private value x, and pre-calculated public value y = gx mod p.
Parameters:
p - the prime as a java.math.BigInteger
g - the base as a java.math.BigInteger
x - the value of x as a java.math.BigInteger
y - the value of y as a java.math.BigInteger
Throws:
NullPointerException - if p == null || g == null || x == null || y == null

BaseElGamalPrivateKey

public BaseElGamalPrivateKey(java.math.BigInteger p,
                             java.math.BigInteger g,
                             java.math.BigInteger x)
Constructs a BaseElGamalPrivateKey with the specified prime p, base g, and private value x.

The public value y = gx mod p will be calculated.

Parameters:
p - the prime as a java.math.BigInteger
g - the base as a java.math.BigInteger
x - the value of x as a java.math.BigInteger
Throws:
NullPointerException - if p == null || g == null || x == null

BaseElGamalPrivateKey

protected BaseElGamalPrivateKey(ElGamalParams params,
                                java.math.BigInteger x)
Constructs a BaseElGamalPublicKey with a prime and base taken from an object implementing java.security.interfaces.ElGamalParams, and the specified private value x.

The public value y = gx mod p will be calculated.

Parameters:
params - the parameters for this key
x - the value of x as a java.math.BigInteger
Throws:
NullPointerException - if params == null || x == null
See Also:
ElGamalParams
Method Detail

getX

public java.math.BigInteger getX()
Returns the value of x (the private key).
Specified by:
getX in interface ElGamalPrivateKey
Returns:
x as a java.math.BigInteger