Package edu.fiu.adwise.homomorphic_encryption.elgamal

Class ElGamalPublicKey

java.lang.Object

edu.fiu.adwise.homomorphic_encryption.elgamal.ElGamalPublicKey

All Implemented Interfaces:

ElGamal_Key, Serializable, Key, PublicKey

public final class ElGamalPublicKey
extends Object
implements Serializable, PublicKey, ElGamal_Key

Represents the public key for the ElGamal encryption scheme.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
boolean	additive	Indicates whether additive homomorphic encryption is enabled.

Constructor Summary

Constructors

Constructor	Description
ElGamalPublicKey(BigInteger p, BigInteger g, BigInteger h, boolean additive)	Constructs an ElGamalPublicKey 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.
void	set_additive(boolean additive)	Sets whether the key is used for additive homomorphism.
String	toString()	Returns a string representation of the ElGamal public key.

Methods inherited from class java.lang.Object

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

Field Details

additive

public boolean additive

Indicates whether additive homomorphic encryption is enabled.

Constructor Details

ElGamalPublicKey

public ElGamalPublicKey(BigInteger p,
 BigInteger g,
 BigInteger h,
 boolean additive)

Constructs an ElGamalPublicKey with the specified parameters.

Parameters:

p - The prime modulus.

g - The generator.

h - The public key component.

additive - Whether the key is used for additive homomorphism.

Method Details

set_additive

public void set_additive(boolean additive)

Sets whether the key is used for additive homomorphism.

Specified by:

set_additive in interface ElGamal_Key

Parameters:

additive - True if the key is additive, 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 of the key ("X.509").

getEncoded

public byte[] getEncoded()

Returns the encoded form of the key.

Specified by:

getEncoded in interface Key

Returns:

The encoded form of the key (currently null).

getP

public BigInteger getP()

Returns the prime modulus.

Specified by:

getP in interface ElGamal_Key

Returns:

The prime modulus.

toString

public String toString()

Returns a string representation of the ElGamal public key.

Overrides:

toString in class Object

Returns:

A string representation of the key.