de.flexiprovider.core.elgamal
Class ElGamalPrivateKey

java.lang.Object
  |
  +--de.flexiprovider.api.keys.PrivateKey
        |
        +--de.flexiprovider.core.elgamal.ElGamalPrivateKey

All Implemented Interfaces:

java.security.Key, Key, java.security.PrivateKey, java.io.Serializable

public class ElGamalPrivateKey

extends PrivateKey

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

Author:

Thomas Wahrenbruch

See Also:

ElGamalKeyPairGenerator, Serialized Form

Fields inherited from interface java.security.Key

serialVersionUID

Fields inherited from interface java.security.PrivateKey

serialVersionUID

Constructor Summary

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

Method Summary

boolean	equals(java.lang.Object obj)
FlexiBigInt	getA()
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.PrivateKey

getEncoded, getFormat

Methods inherited from class java.lang.Object

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

Constructor Detail

ElGamalPrivateKey

protected ElGamalPrivateKey(FlexiBigInt modulus,
                            FlexiBigInt generator,
                            FlexiBigInt publicA,
                            FlexiBigInt a)

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

a - - the private value a

ElGamalPrivateKey

protected ElGamalPrivateKey(ElGamalPrivateKeySpec 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

getA

public FlexiBigInt getA()

Returns:

the private value a

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 PrivateKey

Returns:

the OID to encode in the SubjectPublicKeyInfo structure

getAlgParams

protected codec.asn1.ASN1Type getAlgParams()

Overrides:

getAlgParams in class PrivateKey

Returns:

the algorithm parameters to encode in the SubjectPublicKeyInfo structure

getKeyData

protected byte[] getKeyData()

Overrides:

getKeyData in class PrivateKey

Returns:

the keyData to encode in the SubjectPublicKeyInfo structure