public PublicKey getPublicCAKey()
throws InvalidKeySpecException, IOException, NoSuchAlgorithmException,
NoSuchProviderException {
ChipAuthenticationPublicKeyInfo info =
securityInfos.getDefaultChipAuthenticationPublicKeyInfo();
AlgorithmParameterSpec algorithmParameterSpec =
securityInfos.getDefaultCADomainParameter().getAlgorithmParameterSpec();
Type type = securityInfos.getDefaultCADomainParameter().getType();
PublicKey pubKey = null;
if (type == Type.ECDH) {
ECParameterSpec eps = (ECParameterSpec) algorithmParameterSpec;
DEROctetString dos =
new DEROctetString(info.getSubjectPublicKeyInfo().getPublicKeyData().getBytes());
ECPoint point = new X9ECPoint(eps.getCurve(), dos).getPoint();
ECPublicKeySpec eks = new ECPublicKeySpec(point, eps);
pubKey = new JCEECPublicKey(type.toString(), eks);
} else {
DHParameterSpec dps = (DHParameterSpec) algorithmParameterSpec;
ASN1Integer dos =
new ASN1Integer(info.getSubjectPublicKeyInfo().getPublicKeyData().getBytes());
DHPublicKeySpec keySpec = new DHPublicKeySpec(dos.getPositiveValue(), dps.getP(), dps.getG());
KeyFactory kf = KeyFactory.getInstance(type.toString());
return kf.generatePublic(keySpec);
}
return pubKey;
}
