Package edu.fiu.adwise.homomorphic_encryption.elgamal

Class ElGamalPrivateKey

java.lang.Object

edu.fiu.adwise.homomorphic_encryption.elgamal.ElGamalPrivateKey

All Implemented Interfaces:

ElGamal_Key, CipherConstants, Serializable, Runnable, Key, PrivateKey, Destroyable

public final class ElGamalPrivateKey
extends Object
implements ElGamal_Key, Serializable, PrivateKey, Runnable, CipherConstants

Represents the private key for the ElGamal encryption scheme. This class implements multiple interfaces to provide functionality for cryptographic operations, serialization, and multithreading.

The ElGamalPrivateKey class includes parameters for the private key, as well as the public key components (p, g, h). It also supports additive homomorphic encryption by generating a lookup table for decryption.

See Also:

• Serialized Form

Field Summary

Fields inherited from interface edu.fiu.adwise.homomorphic_encryption.misc.CipherConstants

BILLION, CERTAINTY, EIGHT, FIELD_SIZE, FIVE, FOUR, KEY_SIZE, NEG_ONE, rnd, THREE, TWO

Constructor Summary

Constructors

Constructor	Description
ElGamalPrivateKey(BigInteger p, BigInteger x, BigInteger g, BigInteger h, boolean additive)	Constructs an ElGamalPrivateKey with the specified parameters.

Method Summary

Modifier and Type	Method	Description
String	getAlgorithm()	Returns the algorithm name.
byte[]	getEncoded()	Returns the encoded form of the key.
String	getFormat()	Returns the format of the key.
BigInteger	getP()	Returns the prime modulus p.
void	run()	Runs the decryption table generation in a separate thread.
void	set_additive(boolean additive)	Sets whether additive homomorphic encryption is enabled.
String	toString()	Returns a string representation of the private key.

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.security.auth.Destroyable

destroy, isDestroyed

Constructor Details

ElGamalPrivateKey

public ElGamalPrivateKey(BigInteger p,
 BigInteger x,
 BigInteger g,
 BigInteger h,
 boolean additive)

Constructs an ElGamalPrivateKey with the specified parameters.

Parameters:

p - The prime modulus.

x - The private key parameter.

g - The generator.

h - The public key component.

additive - Whether additive homomorphic encryption is enabled.

Method Details

set_additive

public void set_additive(boolean additive)

Sets whether additive homomorphic encryption is enabled.

Specified by:

set_additive in interface ElGamal_Key

Parameters:

additive - True to enable additive homomorphic encryption, false otherwise.

getAlgorithm

public String getAlgorithm()

Returns the algorithm name.

Specified by:

getAlgorithm in interface Key

Returns:

The algorithm name, "ElGamal".

getFormat

public String getFormat()

Returns the format of the key.

Specified by:

getFormat in interface Key

Returns:

The format, "PKCS#8".

getEncoded

public byte[] getEncoded()

Returns the encoded form of the key.

Specified by:

getEncoded in interface Key

Returns:

The encoded key, or null if not supported.

run

public void run()

Runs the decryption table generation in a separate thread.

Specified by:

run in interface Runnable

toString

public String toString()

Returns a string representation of the private key.

Overrides:

toString in class Object

Returns:

A string containing the key parameters.

getP

public BigInteger getP()

Returns the prime modulus p.

Specified by:

getP in interface ElGamal_Key

Returns:

The prime modulus p.