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org.bitcoinj.crypto.BLSSignature Maven / Gradle / Ivy
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.dashj.bls.*;
import org.dashj.bls.Utils.ByteVector;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import static com.google.common.base.Preconditions.checkState;
/**
* This class wraps a G2Element in the BLS library
*/
public class BLSSignature extends BLSAbstractObject {
public static int BLS_CURVE_SIG_SIZE = 96;
static byte [] emptySignatureBytes = new byte[BLS_CURVE_SIG_SIZE];
G2Element signatureImpl;
BLSSignature() {
super(BLS_CURVE_SIG_SIZE);
}
public BLSSignature(byte[] signature) {
super(signature, BLS_CURVE_SIG_SIZE, false);
}
public BLSSignature(byte [] signature, boolean legacy) {
super(signature, BLS_CURVE_SIG_SIZE, legacy);
}
public BLSSignature(NetworkParameters params, byte [] payload, int offset) {
super(params, payload, offset, false);
}
public BLSSignature(NetworkParameters params, byte [] payload, int offset, boolean legacy) {
super(params, payload, offset, legacy);
}
public BLSSignature(BLSSignature signature) {
super(signature.getBuffer(), BLS_CURVE_SIG_SIZE, signature.legacy);
}
BLSSignature(G2Element sk) {
super(BLS_CURVE_SIG_SIZE);
valid = true;
signatureImpl = sk;
updateHash();
}
BLSSignature(G2Element sk, boolean legacy) {
super(BLS_CURVE_SIG_SIZE, legacy);
valid = true;
signatureImpl = sk;
updateHash();
}
public static BLSSignature dummy() {
return new BLSSignature(emptySignatureBytes);
}
@Override
boolean internalSetBuffer(byte[] buffer) {
try {
if(Arrays.equals(buffer, emptySignatureBytes))
return false;
signatureImpl = G2Element.fromBytes(buffer, legacy);
return true;
} catch (Exception x) {
//This is added in as a hack, because for some reason when all the unit
//line above fails with an exception, but we can run it again.
try {
signatureImpl = G2Element.fromBytes(buffer, legacy);
return true;
} catch (Exception x2) {
return false;
}
}
}
@Override
boolean internalGetBuffer(byte[] buffer, boolean legacy) {
byte [] serialized = signatureImpl.serialize(legacy);
System.arraycopy(serialized, 0, buffer, 0, buffer.length);
return true;
}
@Override
protected void parse() throws ProtocolException {
super.parse(); // set version
byte[] buffer = readBytes(BLS_CURVE_SIG_SIZE);
valid = internalSetBuffer(buffer);
serializedSize = BLS_CURVE_SIG_SIZE;
length = cursor - offset;
}
public void aggregateInsecure(BLSSignature o) {
checkState(valid && o.valid);
signatureImpl = BLSScheme.get(BLSScheme.isLegacyDefault()).aggregate(new G2ElementVector(new G2Element[]{signatureImpl, o.signatureImpl}));
updateHash();
}
public static BLSSignature aggregateInsecure(ArrayList sigs, boolean legacy) {
if(sigs.isEmpty()) {
return new BLSSignature();
}
G2ElementVector v_sigs = new G2ElementVector();
v_sigs.reserve(sigs.size());
for(BLSSignature sk : sigs) {
v_sigs.add(sk.signatureImpl);
}
G2Element agg = BLSScheme.get(legacy).aggregate(v_sigs);
return new BLSSignature(agg);
}
public static BLSSignature aggregateSecure(List sigs,
List pks,
Sha256Hash hash,
boolean legacy)
{
if (sigs.size() != pks.size() || sigs.isEmpty()) {
return new BLSSignature();
}
G1ElementVector vecPublicKeys = new G1ElementVector();
vecPublicKeys.reserve(sigs.size());
for (BLSPublicKey pk : pks) {
vecPublicKeys.add(pk.publicKeyImpl);
}
G2ElementVector vecSignatures = new G2ElementVector();
vecSignatures.reserve(pks.size());
for (BLSSignature sig : sigs) {
vecSignatures.add(sig.signatureImpl);
}
return new BLSSignature(BLSScheme.get(legacy).aggregateSecure(vecPublicKeys, vecSignatures, hash.getBytes()));
}
public void subInsecure(BLSSignature o) {
Preconditions.checkArgument(valid && o.valid);
signatureImpl = DASHJBLS.add(signatureImpl, o.signatureImpl.negate());
updateHash();
}
public boolean verifyInsecure(BLSPublicKey pubKey, Sha256Hash hash) {
if(!valid || !pubKey.valid)
return false;
try {
return BLSScheme.get(BLSScheme.isLegacyDefault()).verify(pubKey.publicKeyImpl, hash.getBytes(), signatureImpl);
} catch (Exception x) {
log.error("signature verification error: ", x);
return false;
}
}
public boolean verifyInsecure(BLSPublicKey pubKey, Sha256Hash hash, boolean legacy) {
if(!valid || !pubKey.valid)
return false;
try {
return BLSScheme.get(legacy).verify(pubKey.publicKeyImpl, hash.getBytes(), signatureImpl);
} catch (Exception x) {
log.error("signature verification error: ", x);
return false;
}
}
public boolean verifyInsecureAggregated(ArrayList pubKeys, ArrayList hashes)
{
if (!valid) {
return false;
}
checkState(!pubKeys.isEmpty() && !hashes.isEmpty() && pubKeys.size() == hashes.size());
G1ElementVector pubKeyVec = new G1ElementVector();
Uint8VectorVector hashes2 = new Uint8VectorVector();
hashes2.reserve(hashes.size());//will this crash
pubKeyVec.reserve(pubKeys.size());
for (int i = 0; i < pubKeys.size(); i++) {
BLSPublicKey p = pubKeys.get(i);
if (!p.valid) {
return false;
}
pubKeyVec.add(p.publicKeyImpl);
hashes2.add(new ByteVector(hashes.get(i).getBytes()));
}
try {
return BLSScheme.get(BLSScheme.isLegacyDefault()).aggregateVerify(pubKeyVec, hashes2, signatureImpl);
} catch (Exception x) {
log.error("signature verification error: ", x);
return false;
}
}
public boolean verifySecureAggregated(ArrayList pks, Sha256Hash hash)
{
if (pks.isEmpty()) {
return false;
}
G1ElementVector vecPublicKeys = new G1ElementVector();
vecPublicKeys.reserve(pks.size());
for (BLSPublicKey pk : pks) {
vecPublicKeys.add(pk.publicKeyImpl);
}
return BLSScheme.get(BLSScheme.isLegacyDefault()).verifySecure(vecPublicKeys, signatureImpl, hash.getBytes());
}
boolean recover(ArrayList sigs, ArrayList ids)
{
valid = false;
updateHash();
if (sigs.isEmpty() || ids.isEmpty() || sigs.size() != ids.size()) {
return false;
}
G2ElementVector sigsVec = new G2ElementVector();
Uint8VectorVector idsVec = new Uint8VectorVector();
sigsVec.reserve(sigs.size());
idsVec.reserve(sigs.size());
for (int i = 0; i < sigs.size(); i++) {
if (!sigs.get(i).valid || !ids.get(i).valid) {
return false;
}
sigsVec.add(sigs.get(i).signatureImpl);
idsVec.add(new ByteVector(ids.get(i).hash.getBytes()));
}
try {
signatureImpl = DASHJBLS.signatureRecover(sigsVec, idsVec);
} catch (Exception x) {
return false;
}
valid = true;
updateHash();
return true;
}
public boolean checkMalleable(byte [] buf, int size)
{
byte [] buf2 = getBuffer(serializedSize);
if (!Arrays.equals(buf, buf2)) {
// TODO not sure if this is actually possible with the BLS libs. I'm assuming here that somewhere deep inside
// these libs masking might happen, so that 2 different binary representations could result in the same object
// representation
return false;
}
return true;
}
public boolean isCanonical() {
return true;
}
}
