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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.net.eap.message.simaka;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.EAP_AT_AUTN;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.EAP_AT_AUTS;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.EAP_AT_BIDDING;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.EAP_AT_RAND;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.EAP_AT_RES;
import static com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.LENGTH_SCALING;
import com.android.internal.net.eap.exceptions.simaka.EapSimAkaInvalidAttributeException;
import com.android.internal.net.eap.exceptions.simaka.EapSimAkaUnsupportedAttributeException;
import com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.AtAutn;
import com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.AtAuts;
import com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.AtBidding;
import com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.AtRandAka;
import com.android.internal.net.eap.message.simaka.EapSimAkaAttribute.AtRes;
import java.nio.ByteBuffer;
/**
* EapAkaAttributeFactory is used for creating EAP-AKA attributes according to their type.
*
* @see <a href="https://tools.ietf.org/html/rfc4187">RFC 4187, Extensible Authentication
* Protocol for Authentication and Key Agreement (EAP-AKA)</a>
* @see <a href="https://www.iana.org/assignments/eap-numbers/eap-numbers.xhtml">EAP SIM/AKA
* Attributes</a>
*/
public class EapAkaAttributeFactory extends EapSimAkaAttributeFactory {
private static EapAkaAttributeFactory sInstance = new EapAkaAttributeFactory();
protected EapAkaAttributeFactory() {}
public static EapAkaAttributeFactory getInstance() {
return sInstance;
}
/**
* Decodes a single EapSimAkaAttribute object from the given ByteBuffer.
*
* <p>Decoding logic is based on Attribute definitions in RFC 4187#10.
*
* @param byteBuffer The ByteBuffer to parse the current attribute from
* @return The current EapSimAkaAttribute to be parsed, or EapSimAkaUnsupportedAttribute if the
* given attributeType is skippable and unsupported
* @throws EapSimAkaInvalidAttributeException when a malformatted attribute is attempted to be
* decoded
* @throws EapSimAkaUnsupportedAttributeException when an unsupported, unskippable Attribute is
* attempted to be decoded
*/
public EapSimAkaAttribute getAttribute(ByteBuffer byteBuffer)
throws EapSimAkaInvalidAttributeException, EapSimAkaUnsupportedAttributeException {
int attributeType = Byte.toUnsignedInt(byteBuffer.get());
// Length is given as a multiple of 4x bytes (RFC 4187#8.1)
int lengthInBytes = Byte.toUnsignedInt(byteBuffer.get()) * LENGTH_SCALING;
return getAttribute(attributeType, lengthInBytes, byteBuffer);
}
@Override
protected EapSimAkaAttribute getAttribute(
int attributeType, int lengthInBytes, ByteBuffer byteBuffer)
throws EapSimAkaInvalidAttributeException, EapSimAkaUnsupportedAttributeException {
switch (attributeType) {
case EAP_AT_RAND:
return new AtRandAka(lengthInBytes, byteBuffer);
case EAP_AT_AUTN:
return new AtAutn(lengthInBytes, byteBuffer);
case EAP_AT_RES:
return new AtRes(lengthInBytes, byteBuffer);
case EAP_AT_AUTS:
return new AtAuts(lengthInBytes, byteBuffer);
case EAP_AT_BIDDING:
return new AtBidding(lengthInBytes, byteBuffer);
default:
return super.getAttribute(attributeType, lengthInBytes, byteBuffer);
}
}
}
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