We should add a constructor and method to the java.security.spec.ECPoint class that would allow us to remove a few dependencies on the internal sun.security EC classes from the XML DSig implementation (see org.jcp.xml.dsig.internal.dom.DOMKeyValue.getMethods()).

public ECPoint(byte[] encoded, EllipticCurve curve)

public byte[] getEncoded(EllipticCurve curve)

Further details on the encoding format will be added later.