iaik.security.ecc.spec
Class ECDSAPrivateKeySpec

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

All Implemented Interfaces:

java.security.spec.KeySpec

public class ECDSAPrivateKeySpec

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 private key spec. This is a transparent representation of the private key material, which consists of the scalar s 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

Constructor Summary

ECDSAPrivateKeySpec(java.math.BigInteger s, java.math.BigInteger r, java.math.BigInteger k, ECPoint g)
Creates a new private key spec from the specified parameters

Method Summary

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

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

Constructor Detail

ECDSAPrivateKeySpec

public ECDSAPrivateKeySpec(java.math.BigInteger s,
                           java.math.BigInteger r,
                           java.math.BigInteger k,
                           ECPoint g)

Creates a new private key spec from the specified parameters

Parameters:

s - the private 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)

getS

public java.math.BigInteger getS()

Returns:

the private key s, satisfying W = s*G