part7
Class ECPrivateKey

java.lang.Object
  part7.ECPrivateKey

public class ECPrivateKey

extends java.lang.Object

A class to implement a private key for ElGamal using elliptics curves.

Field Summary

protected ECPoint	_b
protected Curve	_c
protected java.math.BigInteger	_x

Constructor Summary

ECPrivateKey(Curve c, ECPoint b, java.math.BigInteger x)
A constructor for an ElGamal private key (c,b,x).

ECPrivateKey(ECPrivateKey key)
A copy constructor for an ElGamal private key.

Method Summary

ECPoint	decrypt(ECCipherText cipherText) A method to decrypt the ciphertext cipherText using this private key.
java.util.AbstractList	MVDecrypt(MVCipherText c) A method to decrypt the ciphertext c using this private key with Menezes-Vanstone.
java.lang.String	toString() A method to produce a string representation of this private EG key.

Methods inherited from class java.lang.Object

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

Field Detail

_c

protected Curve _c

_b

protected ECPoint _b

_x

protected java.math.BigInteger _x

Constructor Detail

ECPrivateKey

public ECPrivateKey(Curve c,
                    ECPoint b,
                    java.math.BigInteger x)
             throws java.lang.Exception

A constructor for an ElGamal private key (c,b,x).

Throws:

Exception.

java.lang.Exception

ECPrivateKey

public ECPrivateKey(ECPrivateKey key)
             throws java.lang.Exception

A copy constructor for an ElGamal private key.

Throws:

Exception.

java.lang.Exception

Method Detail

decrypt

public ECPoint decrypt(ECCipherText cipherText)
                throws java.lang.Exception

A method to decrypt the ciphertext cipherText using this private key.

Throws:

Exception.

java.lang.Exception

MVDecrypt

public java.util.AbstractList MVDecrypt(MVCipherText c)
                                 throws java.lang.Exception

A method to decrypt the ciphertext c using this private key with Menezes-Vanstone.

Returns:

A list containing the two values x₁ and x₂.

Throws:

Exception.

java.lang.Exception

toString

public java.lang.String toString()

A method to produce a string representation of this private EG key.

Throws:

Exception.