de.flexiprovider.core.elgamal
Class ElGamalPublicKey

java.lang.Object
  |
  +--de.flexiprovider.api.keys.PublicKey
        |
        +--de.flexiprovider.core.elgamal.ElGamalPublicKey

All Implemented Interfaces:

java.security.Key, Key, java.security.PublicKey, java.io.Serializable

public class ElGamalPublicKey

extends PublicKey

This class implements the PublicKey interface. It is normally instantiated from ElGamalKeyPairGenerator. The public key consists of a modulus p (a prime), a generator of (Zp/Z)* and the public value A = g^a mod p, a is the private exponent.

Author:

Thomas Wahrenbruch

See Also:

ElGamalKeyPairGenerator, Serialized Form

Fields inherited from interface java.security.Key

serialVersionUID

Fields inherited from interface java.security.PublicKey

serialVersionUID

Constructor Summary

protected	ElGamalPublicKey(ElGamalPublicKeySpec keySpec) Construct an ElGamalPublicKey out of the given key specification.
protected	ElGamalPublicKey(FlexiBigInt modulus, FlexiBigInt generator, FlexiBigInt publicA) The constructor.

Method Summary

boolean	equals(java.lang.Object obj)
java.lang.String	getAlgorithm() Return the algorithm name.
protected codec.asn1.ASN1Type	getAlgParams()
FlexiBigInt	getGenerator()
protected byte[]	getKeyData()
FlexiBigInt	getModulus()
protected codec.asn1.ASN1ObjectIdentifier	getOID()
FlexiBigInt	getPublicA()
int	hashCode()
java.lang.String	toString()

Methods inherited from class de.flexiprovider.api.keys.PublicKey

getEncoded, getFormat

Methods inherited from class java.lang.Object

, clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ElGamalPublicKey

protected ElGamalPublicKey(FlexiBigInt modulus,
                           FlexiBigInt generator,
                           FlexiBigInt publicA)

The constructor.

Parameters:

modulus - - the prime modulus which specifies the group

generator - - a generator of the group

publicA - - the public value A = g^a mod modulus

ElGamalPublicKey

protected ElGamalPublicKey(ElGamalPublicKeySpec keySpec)

Construct an ElGamalPublicKey out of the given key specification.

Parameters:

keySpec - the key specification

Method Detail

getAlgorithm

public java.lang.String getAlgorithm()

Return the algorithm name.

Returns:

"ElGamal"

getModulus

public FlexiBigInt getModulus()

Returns:

the prime modulus

getGenerator

public FlexiBigInt getGenerator()

Returns:

the generator

getPublicA

public FlexiBigInt getPublicA()

Returns:

the public value A = g^a mod modulus

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

Returns:

a human readable form of the key

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

getOID

protected codec.asn1.ASN1ObjectIdentifier getOID()

Overrides:

getOID in class PublicKey

Returns:

the OID to encode in the SubjectPublicKeyInfo structure

getAlgParams

protected codec.asn1.ASN1Type getAlgParams()

Overrides:

getAlgParams in class PublicKey

Returns:

the algorithm parameters to encode in the SubjectPublicKeyInfo structure

getKeyData

protected byte[] getKeyData()

Overrides:

getKeyData in class PublicKey

Returns:

the keyData to encode in the SubjectPublicKeyInfo structure