Java tutorial
/** * Copyright 2013 Crypto Workshop Pty Ltd * * 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.cryptoworkshop.ximix.common.asn1.message; import org.bouncycastle.asn1.ASN1EncodableVector; import org.bouncycastle.asn1.ASN1Integer; import org.bouncycastle.asn1.ASN1Object; import org.bouncycastle.asn1.ASN1Primitive; import org.bouncycastle.asn1.ASN1Sequence; import org.bouncycastle.asn1.DERSequence; import org.bouncycastle.asn1.DERUTF8String; /** * Request message to download a chunk of partially-decrypted board data. */ public class DownloadShuffledBoardMessage extends ASN1Object { private final String boardName; private final String keyID; private final int blockSize; /** * Base constructor. * * @param keyID the ID of the private key to decrypt against. * @param boardName the source board that the original shuffle was on. * @param blockSize number of messages to return at a time. */ public DownloadShuffledBoardMessage(String keyID, String boardName, int blockSize) { this.keyID = keyID; this.boardName = boardName; this.blockSize = blockSize; } private DownloadShuffledBoardMessage(ASN1Sequence seq) { this.keyID = DERUTF8String.getInstance(seq.getObjectAt(0)).getString(); this.boardName = DERUTF8String.getInstance(seq.getObjectAt(1)).getString(); this.blockSize = ASN1Integer.getInstance(seq.getObjectAt(2)).getValue().intValue(); } public static final DownloadShuffledBoardMessage getInstance(Object o) { if (o instanceof DownloadShuffledBoardMessage) { return (DownloadShuffledBoardMessage) o; } else if (o != null) { return new DownloadShuffledBoardMessage(ASN1Sequence.getInstance(o)); } return null; } @Override public ASN1Primitive toASN1Primitive() { ASN1EncodableVector v = new ASN1EncodableVector(); v.add(new DERUTF8String(keyID)); v.add(new DERUTF8String(boardName)); v.add(new ASN1Integer(blockSize)); return new DERSequence(v); } public String getBoardName() { return boardName; } public String getKeyID() { return keyID; } public int getBlockSize() { return blockSize; } }