| /* |
| * Copyright 2017-present Open Networking Laboratory |
| * |
| * 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 org.onlab.packet; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Class representing MKPDU ICV Indicator. |
| * IEEE 802.1X Clause 11; Figure 11-16 |
| */ |
| public class EAPOLMkpduICVIndicatorParameterSet extends BasePacket implements EAPOLMkpduParameterSet { |
| |
| // Variables for Hash Generation. |
| private byte[] icv; |
| |
| /* |
| * Body Length is fixed in SAK Use Parameter Set. |
| * Still variable kept for de-serialization purpose. |
| */ |
| private short bodyLength; |
| |
| // Total packet length. Currently only 128bit ICV is supported. |
| public static final short TOTAL_ICVPS_BODY_LENGTH = 20; |
| |
| |
| @Override |
| public byte[] serialize() { |
| short length = getTotalLength(); |
| |
| // Serialize ICV Indicator Parameter Set. IEEE 802.1x, Figure 11.16 . |
| ByteBuffer data = ByteBuffer.wrap(new byte[length]); |
| |
| /* |
| * Populate fields |
| * Octet 1 |
| */ |
| data.put(EAPOLMkpduParameterSet.PARAMETERSET_TYPE_ICV_INDICATOR); |
| |
| // Octet 2. Reserved. |
| byte octet = 0x00; |
| data.put(octet); |
| |
| // Octet 3 |
| length -= EAPOLMkpduParameterSet.BODY_LENGTH_OCTET_OFFSET; |
| octet |= (byte) (length >> BODY_LENGTH_MSB_SHIFT & BODY_LENGTH_MSB_MASK); |
| data.put(octet); |
| |
| // Octet 4 |
| data.put((byte) length); |
| |
| // Note : ICV generation excluded from serialization. |
| // Should be done at the level where ethernet packet is being created. |
| |
| return data.array(); |
| } |
| |
| /** |
| * Deserializer function for ICV Indicator Parameter Set. |
| * |
| * @return deserializer function |
| */ |
| public static Deserializer<EAPOLMkpduICVIndicatorParameterSet> deserializer() { |
| return (data, offset, length) -> { |
| // TODO : Ensure buffer has enough details. |
| |
| // Deserialize Basic Parameter Set. |
| final ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| EAPOLMkpduICVIndicatorParameterSet icvps = new EAPOLMkpduICVIndicatorParameterSet(); |
| |
| // Extract fields. Skip type, reserved fields. |
| byte[] mbField = new byte[2]; |
| bb.get(mbField, 0, 2); |
| short bodyLength = (short) (((short) (mbField[1] & EAPOLMkpduParameterSet.BODY_LENGTH_MSB_MASK)) |
| << EAPOLMkpduParameterSet.BODY_LENGTH_MSB_SHIFT); |
| bodyLength |= (short) (bb.get()); |
| icvps.setBodyLength(bodyLength); |
| |
| // SAK |
| byte[] icv = new byte[bodyLength]; |
| bb.get(icv); |
| icvps.setICV(icv); |
| |
| return icvps; |
| }; |
| } |
| |
| @Override |
| public byte getParameterSetType() { |
| return PARAMETERSET_TYPE_ICV_INDICATOR; |
| } |
| |
| @Override |
| public short getTotalLength() { |
| return TOTAL_ICVPS_BODY_LENGTH; |
| } |
| |
| @Override |
| public short getBodyLength() { |
| return TOTAL_ICVPS_BODY_LENGTH - BODY_LENGTH_OCTET_OFFSET; |
| } |
| |
| /** |
| * To set body length. |
| * |
| * @param bodyLength ,type short |
| */ |
| public void setBodyLength(short bodyLength) { |
| this.bodyLength = bodyLength; |
| } |
| |
| /** |
| * To set ICV. |
| * |
| * @param icv , type byte[] |
| */ |
| public void setICV(byte[] icv) { |
| this.icv = icv; |
| } |
| |
| } |
| |