178 lines
5.0 KiB
Java
178 lines
5.0 KiB
Java
/*
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* Copyright 2015 Christian Basler
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package ch.dissem.bitmessage.entity.payload;
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import ch.dissem.bitmessage.entity.BitmessageAddress;
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import ch.dissem.bitmessage.entity.Encrypted;
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import ch.dissem.bitmessage.exception.DecryptionFailedException;
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import ch.dissem.bitmessage.utils.Decode;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.util.Arrays;
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/**
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* A version 4 public key. When version 4 pubkeys are created, most of the data in the pubkey is encrypted. This is
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* done in such a way that only someone who has the Bitmessage address which corresponds to a pubkey can decrypt and
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* use that pubkey. This prevents people from gathering pubkeys sent around the network and using the data from them
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* to create messages to be used in spam or in flooding attacks.
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*/
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public class V4Pubkey extends Pubkey implements Encrypted {
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private long stream;
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private byte[] tag;
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private CryptoBox encrypted;
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private V3Pubkey decrypted;
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private V4Pubkey(long stream, byte[] tag, CryptoBox encrypted) {
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super(4);
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this.stream = stream;
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this.tag = tag;
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this.encrypted = encrypted;
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}
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public V4Pubkey(V3Pubkey decrypted) {
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super(4);
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this.decrypted = decrypted;
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this.stream = decrypted.stream;
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this.tag = BitmessageAddress.calculateTag(4, decrypted.getStream(), decrypted.getRipe());
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}
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public static V4Pubkey read(InputStream in, long stream, int length, boolean encrypted) throws IOException {
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if (encrypted)
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return new V4Pubkey(stream,
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Decode.bytes(in, 32),
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CryptoBox.read(in, length - 32));
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else
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return new V4Pubkey(V3Pubkey.read(in, stream));
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}
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@Override
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public void encrypt(byte[] publicKey) throws IOException {
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if (getSignature() == null) throw new IllegalStateException("Pubkey must be signed before encryption.");
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this.encrypted = new CryptoBox(decrypted, publicKey);
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}
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@Override
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public void decrypt(byte[] privateKey) throws IOException, DecryptionFailedException {
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decrypted = V3Pubkey.read(encrypted.decrypt(privateKey), stream);
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}
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@Override
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public boolean isDecrypted() {
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return decrypted != null;
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}
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@Override
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public void write(OutputStream stream) throws IOException {
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stream.write(tag);
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encrypted.write(stream);
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}
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@Override
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public void writeUnencrypted(OutputStream out) throws IOException {
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decrypted.write(out);
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}
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@Override
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public void writeBytesToSign(OutputStream out) throws IOException {
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out.write(tag);
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decrypted.writeBytesToSign(out);
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}
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@Override
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public long getVersion() {
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return 4;
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}
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@Override
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public ObjectType getType() {
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return ObjectType.PUBKEY;
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}
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@Override
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public long getStream() {
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return stream;
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}
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public byte[] getTag() {
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return tag;
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}
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@Override
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public byte[] getSigningKey() {
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return decrypted.getSigningKey();
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}
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@Override
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public byte[] getEncryptionKey() {
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return decrypted.getEncryptionKey();
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}
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@Override
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public int getBehaviorBitfield() {
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return decrypted.getBehaviorBitfield();
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}
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@Override
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public byte[] getSignature() {
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if (decrypted != null)
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return decrypted.getSignature();
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else
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return null;
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}
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@Override
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public void setSignature(byte[] signature) {
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decrypted.setSignature(signature);
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}
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@Override
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public boolean isSigned() {
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return true;
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}
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public long getNonceTrialsPerByte() {
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return decrypted.getNonceTrialsPerByte();
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}
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public long getExtraBytes() {
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return decrypted.getExtraBytes();
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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V4Pubkey v4Pubkey = (V4Pubkey) o;
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if (stream != v4Pubkey.stream) return false;
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if (!Arrays.equals(tag, v4Pubkey.tag)) return false;
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return !(decrypted != null ? !decrypted.equals(v4Pubkey.decrypted) : v4Pubkey.decrypted != null);
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}
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@Override
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public int hashCode() {
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int result = (int) (stream ^ (stream >>> 32));
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result = 31 * result + Arrays.hashCode(tag);
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result = 31 * result + (decrypted != null ? decrypted.hashCode() : 0);
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return result;
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}
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}
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