/*******************************************************************************
* Copyright (c) 2014, Institute for Pervasive Computing, ETH Zurich.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Scandium (Sc) Security for Californium.
******************************************************************************/
package ch.ethz.inf.vs.scandium.dtls;
import java.util.ArrayList;
import java.util.List;
import ch.ethz.inf.vs.scandium.dtls.HelloExtensions.ExtensionType;
import ch.ethz.inf.vs.scandium.util.DatagramReader;
public class ClientCertificateTypeExtension extends CertificateTypeExtension {
// Constructors ///////////////////////////////////////////////////
/**
* Constructs an empty certificate type extension. If it is client-sided
* there is a list of supported certificate type (ordered by preference);
* server-side only 1 certificate type is chosen.
*
* @param isClient
* whether this instance is considered the client.
*/
public ClientCertificateTypeExtension(boolean isClient) {
super(ExtensionType.CLIENT_CERT_TYPE, isClient);
}
/**
* Constructs a certificate type extension with a list of supported
* certificate types. The server only chooses 1 certificate type.
*
* @param certificateTypes
* the list of supported certificate types.
* @param isClient
* whether this instance is considered the client.
*/
public ClientCertificateTypeExtension(boolean isClient, List<CertificateType> certificateTypes) {
super(ExtensionType.CLIENT_CERT_TYPE, isClient, certificateTypes);
}
// Methods ////////////////////////////////////////////////////////
public String toString() {
StringBuilder sb = new StringBuilder(super.toString());
for (CertificateType type : certificateTypes) {
sb.append("\t\t\t\tClient certificate type: " + type.toString() + "\n");
}
return sb.toString();
};
public static HelloExtension fromByteArray(byte[] byteArray) {
DatagramReader reader = new DatagramReader(byteArray);
List<CertificateType> certificateTypes = new ArrayList<CertificateType>();
// the client's extension needs at least 2 bytes, while the server's is exactly 1 byte long
boolean isClientExtension = true;
if (byteArray.length > 1) {
int length = reader.read(LIST_FIELD_LENGTH_BITS);
for (int i = 0; i < length; i++) {
certificateTypes.add(CertificateType.getTypeFromCode(reader.read(EXTENSION_TYPE_BITS)));
}
} else {
certificateTypes.add(CertificateType.getTypeFromCode(reader.read(EXTENSION_TYPE_BITS)));
isClientExtension = false;
}
return new ClientCertificateTypeExtension(isClientExtension, certificateTypes);
}
}