gnu.crypto.key.dss

Class DSSPublicKey

java.lang.Object

gnu.crypto.key.dss.DSSKey

gnu.crypto.key.dss.DSSPublicKey

All Implemented Interfaces:

java.io.Serializable, java.security.interfaces.DSAKey, java.security.interfaces.DSAPublicKey, java.security.Key, java.security.PublicKey

public class DSSPublicKey
extends DSSKey
implements java.security.PublicKey, java.security.interfaces.DSAPublicKey

An object that embodies a DSS (Digital Signature Standard) public key.

Version:

$Revision: 1.1 $

See Also:

getEncoded(int), Serialized Form

Field Summary

Fields inherited from class gnu.crypto.key.dss.DSSKey

g, p, q

Fields inherited from interface java.security.interfaces.DSAPublicKey

serialVersionUID

Constructor Summary

Constructors

Constructor and Description
DSSPublicKey(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g, java.math.BigInteger y) Trivial constructor.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Returns true if the designated object is an instance of DSAPublicKey and has the same DSS (Digital Signature Standard) parameter values as this one.
byte[]	getEncoded(int format) Returns the encoded form of this public key according to the designated format.
java.math.BigInteger	getY()
static DSSPublicKey	valueOf(byte[] k) A class method that takes the output of the encodePublicKey() method of a DSS keypair codec object (an instance implementing IKeyPairCodec for DSS keys, and re-constructs an instance of this object.

Methods inherited from class gnu.crypto.key.dss.DSSKey

getAlgorithm, getEncoded, getFormat, getParams

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.security.interfaces.DSAKey

getParams

Methods inherited from interface java.security.Key

getAlgorithm, getEncoded, getFormat

Constructor Detail

DSSPublicKey

public DSSPublicKey(java.math.BigInteger p,
                    java.math.BigInteger q,
                    java.math.BigInteger g,
                    java.math.BigInteger y)

Trivial constructor.

Parameters:

p - the public modulus.

q - the public prime divisor of p-1.

g - a generator of the unique cyclic group Z* p.

y - the public key part.

Method Detail

valueOf

public static DSSPublicKey valueOf(byte[] k)

A class method that takes the output of the encodePublicKey() method of a DSS keypair codec object (an instance implementing IKeyPairCodec for DSS keys, and re-constructs an instance of this object.

Parameters:

k - the contents of a previously encoded instance of this object.

Throws:

java.lang.ArrayIndexOutOfBoundsException - if there is not enough bytes, in k, to represent a valid encoding of an instance of this object.

java.lang.IllegalArgumentException - if the byte sequence does not represent a valid encoding of an instance of this object.

getY

public java.math.BigInteger getY()

Specified by:

getY in interface java.security.interfaces.DSAPublicKey

getEncoded

public byte[] getEncoded(int format)

Returns the encoded form of this public key according to the designated format.

Specified by:

getEncoded in class DSSKey

Parameters:

format - the desired format identifier of the resulting encoding.

Returns:

the byte sequence encoding this key according to the designated format.

Throws:

java.lang.IllegalArgumentException - if the format is not supported.

See Also:

DSSKeyPairRawCodec

equals

public boolean equals(java.lang.Object obj)

Returns true if the designated object is an instance of DSAPublicKey and has the same DSS (Digital Signature Standard) parameter values as this one.

Overrides:

equals in class DSSKey

Parameters:

obj - the other non-null DSS key to compare to.

Returns:

true if the designated object is of the same type and value as this one.