/****************************************************************************
* Copyright (C) 2012 ecsec GmbH.
* All rights reserved.
* Contact: ecsec GmbH (info@ecsec.de)
*
* This file is part of the Open eCard App.
*
* GNU General Public License Usage
* This file may be used under the terms of the GNU General Public
* License version 3.0 as published by the Free Software Foundation
* and appearing in the file LICENSE.GPL included in the packaging of
* this file. Please review the following information to ensure the
* GNU General Public License version 3.0 requirements will be met:
* http://www.gnu.org/copyleft/gpl.html.
*
* Other Usage
* Alternatively, this file may be used in accordance with the terms
* and conditions contained in a signed written agreement between
* you and ecsec GmbH.
*
***************************************************************************/
package org.openecard.crypto.common.asn1.eac;
import java.security.spec.AlgorithmParameterSpec;
import org.openecard.crypto.common.asn1.eac.oid.EACObjectIdentifier;
/**
*
* @author Moritz Horsch <horsch@cdc.informatik.tu-darmstadt.de>
*/
public final class CADomainParameter {
private AlgorithmParameterSpec domainParameter;
private CASecurityInfos csi;
private CAInfo ci;
/**
* Create new CADomainParameter.
*
* @param csi CASecurityInfos
*/
public CADomainParameter(CASecurityInfos csi) {
this.csi = csi;
this.ci = csi.getCAInfo();
loadParameters();
}
/**
* Create new CADomainParameter.
*
* @param csi CASecurityInfos
* @param domainParameter AlgorithmParameterSpec
*/
public CADomainParameter(CASecurityInfos csi, AlgorithmParameterSpec domainParameter) {
this.csi = csi;
this.ci = csi.getCAInfo();
this.domainParameter = domainParameter;
}
/**
* Returns the domain parameter.
*
* @return Domain parameter
*/
public AlgorithmParameterSpec getParameter() {
return domainParameter;
}
/**
* Sets the domain parameter.
*
* @param domainParameter Domain parameter
*/
public void setParameter(AlgorithmParameterSpec domainParameter) {
this.domainParameter = domainParameter;
}
/**
* Checks if the protocol identifier indicates Diffie-Hellman.
*
* @return True if Diffie-Hellman is used, otherwise false
*/
public boolean isDH() {
return ci.isDH();
}
/**
* Checks if the protocol identifier indicates elliptic curve Diffie-Hellman.
*
* @return True if elliptic curve Diffie-Hellman is used, otherwise false
*/
public boolean isECDH() {
return ci.isECDH();
}
private void loadParameters() {
CADomainParameterInfo cdp = csi.getCADomainParameterInfo();
AlgorithmIdentifier ai = cdp.getDomainParameter();
if (ai.getObjectIdentifier().equals(EACObjectIdentifier.standardized_Domain_Parameters)) {
int index = Integer.parseInt(ai.getParameters().toString());
domainParameter = new StandardizedDomainParameters(index).getParameter();
} else {
domainParameter = new ExplicitDomainParameters(ai).getParameter();
}
if (domainParameter == null) {
throw new IllegalArgumentException("Cannot load domain parameter");
}
}
}