private java.security.spec.ECPoint getPublicPoint(ECDSAPublicKey key) {
if (!key.hasParameters()) {
throw new IllegalArgumentException("Public key does not contains EC Params");
}
BigInteger p = key.getPrimeModulusP();
ECCurve.Fp curve = new ECCurve.Fp(p, key.getFirstCoefA(), key.getSecondCoefB());
ECPoint.Fp pubY = (ECPoint.Fp) curve.decodePoint(key.getPublicPointY());
return new java.security.spec.ECPoint(
pubY.getAffineXCoord().toBigInteger(), pubY.getAffineYCoord().toBigInteger());
}
private ECParameterSpec getParams(ECDSAPublicKey key) {
if (!key.hasParameters()) {
throw new IllegalArgumentException("Public key does not contains EC Params");
}
BigInteger p = key.getPrimeModulusP();
ECCurve.Fp curve = new ECCurve.Fp(p, key.getFirstCoefA(), key.getSecondCoefB());
ECPoint G = curve.decodePoint(key.getBasePointG());
BigInteger order = key.getOrderOfBasePointR();
BigInteger coFactor = key.getCofactorF();
EllipticCurve jcaCurve = convertCurve(curve);
return new ECParameterSpec(
jcaCurve,
new java.security.spec.ECPoint(
G.getAffineXCoord().toBigInteger(), G.getAffineYCoord().toBigInteger()),
order,
coFactor.intValue());
}
