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org.bitcoinj.crypto.BLSPublicKey Maven / Gradle / Ivy
/*
* Copyright 2019 Dash Core Group.
*
* 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.bitcoinj.crypto;
import com.google.common.base.Preconditions;
import org.bitcoinj.core.NetworkParameters;
import org.bitcoinj.core.ProtocolException;
import org.bitcoinj.core.Sha256Hash;
import org.bitcoinj.core.Utils;
import org.dashj.bls.DASHJBLS;
import org.dashj.bls.G1Element;
import org.dashj.bls.G1ElementVector;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
/**
* This class wraps a G1Element in the BLS library
*/
public class BLSPublicKey extends BLSAbstractObject {
public static final int BLS_CURVE_PUBKEY_SIZE = 48;
G1Element publicKeyImpl;
public BLSPublicKey() {
super(BLS_CURVE_PUBKEY_SIZE);
}
public BLSPublicKey(G1Element pk) {
this(pk, false);
}
public BLSPublicKey(G1Element pk, boolean legacy) {
super(BLS_CURVE_PUBKEY_SIZE);
valid = true;
publicKeyImpl = pk;
this.legacy = legacy;
updateHash();
}
/**
*
* @param publicKey the bytes for the public key in basic scheme
*/
public BLSPublicKey(byte [] publicKey) {
this(publicKey, false);
}
public static BLSPublicKey fromSerializedBytes(byte [] publicKey) {
boolean legacy;
if (publicKey.length == BLS_CURVE_PUBKEY_SIZE + 1) {
legacy = publicKey[0] != 0;
publicKey = Arrays.copyOfRange(publicKey, 1, publicKey.length);
} else {
throw new IllegalArgumentException("serialized public key should be 49 bytes but is " + publicKey.length + " bytes");
}
return new BLSPublicKey(publicKey, legacy);
}
public BLSPublicKey(byte [] publicKey, boolean legacy) {
super(BLS_CURVE_PUBKEY_SIZE);
Preconditions.checkArgument(publicKey.length == BLS_CURVE_PUBKEY_SIZE);
publicKeyImpl = G1Element.fromBytes(publicKey, legacy);
valid = true;
this.legacy = legacy;
updateHash();
}
public BLSPublicKey(String publicKeyHex, boolean legacy) {
this(Utils.HEX.decode(publicKeyHex), legacy);
}
public BLSPublicKey(NetworkParameters params, byte [] payload, int offset) {
super(params, payload, offset, false);
}
public BLSPublicKey(NetworkParameters params, byte [] payload, int offset, boolean legacy) {
super(params, payload, offset, legacy);
}
public BLSPublicKey(BLSPublicKey publicKey) {
super(publicKey.getBuffer(), BLS_CURVE_PUBKEY_SIZE, publicKey.legacy);
}
@Override
boolean internalSetBuffer(byte[] buffer) {
try {
publicKeyImpl = G1Element.fromBytes(buffer, legacy);
return true;
} catch (Exception x) {
// try again
try {
publicKeyImpl = G1Element.fromBytes(buffer, legacy);
return true;
} catch (Exception x2) {
return false;
}
}
}
@Override
boolean internalGetBuffer(byte[] buffer, boolean legacy) {
byte [] serialized = publicKeyImpl.serialize(legacy);
System.arraycopy(serialized, 0, buffer, 0, buffer.length);
return true;
}
@Override
protected void parse() throws ProtocolException {
super.parse();
byte[] buffer = readBytes(BLS_CURVE_PUBKEY_SIZE);
valid = internalSetBuffer(buffer);
serializedSize = BLS_CURVE_PUBKEY_SIZE;
length = cursor - offset;
}
@Override
protected void bitcoinSerializeToStream(OutputStream stream) throws IOException {
super.bitcoinSerializeToStream(stream);
}
public byte[] serialize(boolean legacy) {
return publicKeyImpl.serialize(legacy);
}
public void aggregateInsecure(BLSPublicKey sk) {
Preconditions.checkState(valid && sk.valid);
publicKeyImpl = BLSScheme.get(BLSScheme.isLegacyDefault()).aggregate(
new G1ElementVector(
new G1Element[]{publicKeyImpl, sk.publicKeyImpl}
)
);
updateHash();
}
public static BLSPublicKey aggregateInsecure(ArrayList pks, boolean legacy) {
if(pks.isEmpty()) {
return new BLSPublicKey();
}
G1ElementVector publicKeys = new G1ElementVector();
for(BLSPublicKey sk : pks) {
publicKeys.add(sk.publicKeyImpl);
}
G1Element agg = BLSScheme.get(legacy).aggregate(publicKeys);
return new BLSPublicKey(agg);
}
public boolean publicKeyShare(ArrayList mpk, BLSId id) {
valid = false;
updateHash();
if(!id.valid)
return false;
G1ElementVector mpkVec = new G1ElementVector();
for(BLSPublicKey pk : mpk) {
if(!pk.valid)
return false;
mpkVec.add(pk.publicKeyImpl);
}
try {
publicKeyImpl = DASHJBLS.publicKeyShare(mpkVec, id.hash.getBytes());
} catch (Exception x) {
return false;
}
valid = true;
updateHash();
return true;
}
public boolean setDHKeyExchange(BLSSecretKey sk, BLSPublicKey pk)
{
valid = false;
hash = Sha256Hash.ZERO_HASH;
if (!sk.valid || !pk.valid) {
return false;
}
publicKeyImpl = DASHJBLS.multiply(sk.privateKey, pk.publicKeyImpl);
valid = true;
updateHash();
return true;
}
public static BLSPublicKey dHKeyExchange(BLSSecretKey sk, BLSPublicKey pk) {
if (!sk.valid || !pk.valid) {
return null;
}
return new BLSPublicKey(DASHJBLS.multiply(sk.privateKey, pk.publicKeyImpl));
}
public long getFingerprint() {
return publicKeyImpl.getFingerprint(false);
}
public long getFingerprint(boolean legacy) {
return publicKeyImpl.getFingerprint(legacy);
}
@Override
public boolean isLegacy() {
return legacy;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
BLSPublicKey that = (BLSPublicKey) o;
if (publicKeyImpl == that.publicKeyImpl) {
return true;
}
return DASHJBLS.objectEquals(publicKeyImpl, that.publicKeyImpl);
}
}
