iaik.security.ecc.spec
Class ECDSAPublicKeySpec

java.lang.Object
  iaik.security.ecc.spec.ECDSAPublicKeySpec

All Implemented Interfaces:

java.security.spec.KeySpec

public class ECDSAPublicKeySpec

extends java.lang.Object

implements java.security.spec.KeySpec

Since their are no such classes defined in the JCE/JCA framework, this class defines a ECDSA public key spec. This is a transparent representation of the pubic key material, which consists of the elliptic curve point W, and domain parameters.

Field Summary

protected ECPoint	g_ the base point g
protected java.math.BigInteger	k_ the co-factor
protected java.math.BigInteger	r_ the order order of g
protected ECPoint	w_ the public key, which is the Point W: satisfying W = s*G, where s is the private key.

Constructor Summary

ECDSAPublicKeySpec(ECPoint w, java.math.BigInteger r, java.math.BigInteger k, ECPoint g)
Constructs a new spec. for a ECDSA public key.

Method Summary

ECPoint	getG() The generator of the subgroub of order r.
java.math.BigInteger	getK()
java.math.BigInteger	getR()
ECPoint	getW()

Methods inherited from class java.lang.Object

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

Field Detail

g_

protected ECPoint g_

the base point g

k_

protected java.math.BigInteger k_

the co-factor

r_

protected java.math.BigInteger r_

the order order of g

w_

protected ECPoint w_

the public key, which is the Point W: satisfying W = s*G, where s is the private key.

Constructor Detail

ECDSAPublicKeySpec

public ECDSAPublicKeySpec(ECPoint w,
                          java.math.BigInteger r,
                          java.math.BigInteger k,
                          ECPoint g)

Constructs a new spec. for a ECDSA public key.

Parameters:

w - the public key

r - the order of the subgroup generated by g.

k - the co-factor = #E / r

g - the base point and generator of the group

Method Detail

getG

public ECPoint getG()

The generator of the subgroub of order r.

Returns:

the base point of order r

See Also:

getR()

getK

public java.math.BigInteger getK()

Returns:

the cofactor k = #E / r or null if not known

getR

public java.math.BigInteger getR()

Returns:

the order of the subgroup (base point)

getW

public ECPoint getW()

Returns:

the Point W: satisfying W = s*G