108 lines
3.1 KiB
Java
108 lines
3.1 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 java.io.IOException;
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import java.io.OutputStream;
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import java.util.ArrayList;
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import static ch.dissem.bitmessage.utils.Singleton.security;
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/**
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* Public keys for signing and encryption, the answer to a 'getpubkey' request.
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*/
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public abstract class Pubkey extends ObjectPayload {
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public final static long LATEST_VERSION = 4;
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protected Pubkey(long version) {
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super(version);
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}
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public static byte[] getRipe(byte[] publicSigningKey, byte[] publicEncryptionKey) {
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return security().ripemd160(security().sha512(publicSigningKey, publicEncryptionKey));
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}
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public abstract byte[] getSigningKey();
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public abstract byte[] getEncryptionKey();
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public abstract int getBehaviorBitfield();
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public byte[] getRipe() {
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return security().ripemd160(security().sha512(getSigningKey(), getEncryptionKey()));
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}
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public long getNonceTrialsPerByte() {
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return 0;
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}
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public long getExtraBytes() {
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return 0;
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}
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public void writeUnencrypted(OutputStream out) throws IOException {
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write(out);
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}
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protected byte[] add0x04(byte[] key) {
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if (key.length == 65) return key;
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byte[] result = new byte[65];
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result[0] = 4;
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System.arraycopy(key, 0, result, 1, 64);
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return result;
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}
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/**
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* Bits 0 through 29 are yet undefined
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*/
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public enum Feature {
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/**
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* Receiving node expects that the RIPE hash encoded in their address preceedes the encrypted message data of msg
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* messages bound for them.
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*/
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INCLUDE_DESTINATION(1 << 30),
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/**
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* If true, the receiving node does send acknowledgements (rather than dropping them).
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*/
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DOES_ACK(1 << 31);
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private int bit;
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Feature(int bit) {
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this.bit = bit;
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}
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public static int bitfield(Feature... features) {
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int bits = 0;
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for (Feature feature : features) {
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bits |= feature.bit;
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}
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return bits;
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}
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public static Feature[] features(int bitfield) {
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ArrayList<Feature> features = new ArrayList<>(Feature.values().length);
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for (Feature feature : Feature.values()) {
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if ((bitfield & feature.bit) != 0) {
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features.add(feature);
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}
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}
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return features.toArray(new Feature[features.size()]);
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}
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}
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}
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