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Spoof TLS/JA3/JA4 and HTTP/2 fingerprints in Java
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package org.bouncycastle.tls;

import java.io.IOException;

import org.bouncycastle.tls.crypto.TlsCrypto;

/**
 * Base class for a TLS client or server.
 */
public abstract class AbstractTlsPeer
    implements TlsPeer
{
    private final TlsCrypto crypto;

    private volatile TlsCloseable closeHandle;

    protected AbstractTlsPeer(TlsCrypto crypto)
    {
        this.crypto = crypto;
    }

    /**
     * Get the {@link ProtocolVersion} values that are supported by this peer.
     * 
     * WARNING: Mixing DTLS and TLS versions in the returned array is currently NOT supported. Use a
     * separate (sub-)class for each case.
     *
     * @return an array of supported {@link ProtocolVersion} values.
     */
    protected ProtocolVersion[] getSupportedVersions()
    {
        return ProtocolVersion.TLSv13.downTo(ProtocolVersion.TLSv12);
    }

    protected abstract int[] getSupportedCipherSuites();

    public void cancel() throws IOException
    {
        TlsCloseable closeHandle = this.closeHandle;
        if (null != closeHandle)
        {
            closeHandle.close();
        }
    }

    public TlsCrypto getCrypto()
    {
        return crypto;
    }

    public void notifyCloseHandle(TlsCloseable closeHandle)
    {
        this.closeHandle = closeHandle;
    }

    public void notifyHandshakeBeginning() throws IOException
    {
    }

    public int getHandshakeTimeoutMillis()
    {
        return 0;
    }

    public int getHandshakeResendTimeMillis()
    {
        return 1000;
    }

    public boolean allowLegacyResumption()
    {
        return false;
    }

    public int getMaxCertificateChainLength()
    {
        return 10;
    }

    public int getMaxHandshakeMessageSize()
    {
        return 32768;
    }

    public short[] getPskKeyExchangeModes()
    {
        return new short[]{ PskKeyExchangeMode.psk_dhe_ke };
    }

    public boolean requiresCloseNotify()
    {
        return true;
    }

    public boolean requiresExtendedMasterSecret()
    {
        return false;
    }

    public boolean shouldCheckSigAlgOfPeerCerts()
    {
        return true;
    }

    public boolean shouldUseExtendedMasterSecret()
    {
        return true;
    }

    public boolean shouldUseExtendedPadding()
    {
        return false;
    }

    public boolean shouldUseGMTUnixTime()
    {
        /*
         * draft-mathewson-no-gmtunixtime-00 2. For the reasons we discuss above, we recommend that
         * TLS implementors MUST by default set the entire value the ClientHello.Random and
         * ServerHello.Random fields, including gmt_unix_time, to a cryptographically random
         * sequence.
         */
        return false;
    }

    public void notifySecureRenegotiation(boolean secureRenegotiation) throws IOException
    {
        if (!secureRenegotiation)
        {
            throw new TlsFatalAlert(AlertDescription.handshake_failure);
        }
    }

    public TlsKeyExchangeFactory getKeyExchangeFactory() throws IOException
    {
        return new DefaultTlsKeyExchangeFactory();
    }

    public void notifyAlertRaised(short alertLevel, short alertDescription, String message, Throwable cause)
    {
    }

    public void notifyAlertReceived(short alertLevel, short alertDescription)
    {
    }

    public void notifyConnectionClosed()
    {
    }

    public void notifyHandshakeComplete() throws IOException
    {
    }

    public TlsHeartbeat getHeartbeat()
    {
        return null;
    }

    public short getHeartbeatPolicy()
    {
        return HeartbeatMode.peer_not_allowed_to_send;
    }

    public int getRenegotiationPolicy()
    {
        return RenegotiationPolicy.DENY;
    }
}