gnu.crypto.key.dss
Class DSSKey

java.lang.Object
  gnu.crypto.key.dss.DSSKey

All Implemented Interfaces:

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

Direct Known Subclasses:

DSSPrivateKey, DSSPublicKey

public abstract class DSSKey

extends java.lang.Object

implements java.security.Key, java.security.interfaces.DSAKey

A base asbtract class for both public and private DSS (Digital Signature Standard) keys. It encapsulates the three DSS numbers: p, q and g.

According to the JDK, cryptographic Keys all have a format. The format used in this implementation is called Raw, and basically consists of the raw byte sequences of algorithm parameters. The exact order of the byte sequences and the implementation details are given in each of the relevant getEncoded() methods of each of the private and public keys.

Version:

$Revision: 1.2 $

See Also:

DSSPrivateKey.getEncoded(int), DSSPublicKey.getEncoded(int), Serialized Form

Field Summary

protected java.math.BigInteger	g g = h(p-1)/q mod p, where h is any integer with 1 < h < p - 1 such that h (p-1)/q mod p > 1 (g has order q mod p ).
protected java.math.BigInteger	p A prime modulus, where 2L-1 < p < 2L for 512 <= L <= 1024 and L a multiple of 64.
protected java.math.BigInteger	q A prime divisor of p - 1, where 2159 < q < 2160.

Fields inherited from interface java.security.Key

serialVersionUID

Constructor Summary

protected

DSSKey(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g) Trivial protected constructor.

Method Summary

boolean	equals(java.lang.Object obj) Returns true if the designated object is an instance of DSAKey and has the same DSS (Digital Signature Standard) parameter values as this one.
java.lang.String	getAlgorithm()
byte[]	getEncoded() Deprecated. see getEncoded(int).
abstract byte[]	getEncoded(int format)
java.lang.String	getFormat()
java.security.interfaces.DSAParams	getParams()

Methods inherited from class java.lang.Object

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

Field Detail

p

protected final java.math.BigInteger p

A prime modulus, where 2L-1 < p < 2L for 512 <= L <= 1024 and L a multiple of 64.

q

protected final java.math.BigInteger q

A prime divisor of p - 1, where 2159 < q < 2160.

g

protected final java.math.BigInteger g

g = h(p-1)/q mod p, where h is any integer with 1 < h < p - 1 such that h (p-1)/q mod p > 1 (g has order q mod p ).

Constructor Detail

DSSKey

protected DSSKey(java.math.BigInteger p,
                 java.math.BigInteger q,
                 java.math.BigInteger g)

Trivial protected constructor.

Parameters:

p - the DSS parameter p.

q - the DSS parameter q.

g - the DSS parameter g.

Method Detail

getParams

public java.security.interfaces.DSAParams getParams()

Specified by:

getParams in interface java.security.interfaces.DSAKey

getAlgorithm

public java.lang.String getAlgorithm()

Specified by:

getAlgorithm in interface java.security.Key

getEncoded

public byte[] getEncoded()

Deprecated. see getEncoded(int).

Specified by:

getEncoded in interface java.security.Key

getFormat

public java.lang.String getFormat()

Specified by:

getFormat in interface java.security.Key

equals

public boolean equals(java.lang.Object obj)

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

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.

getEncoded

public abstract byte[] getEncoded(int format)