http://www.bouncycastle.org/java.html: The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.est.jcajce;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocket;

import org.bouncycastle.est.LimitedSource;
import org.bouncycastle.est.Source;
import org.bouncycastle.est.TLSUniqueProvider;


class LimitedSSLSocketSource
    implements Source<SSLSession>, TLSUniqueProvider, LimitedSource
{
    protected final SSLSocket socket;
    private final ChannelBindingProvider bindingProvider;
    private final Long absoluteReadLimit;

    public LimitedSSLSocketSource(SSLSocket sock, ChannelBindingProvider bindingProvider, Long absoluteReadLimit)
    {
        this.socket = sock;
        this.bindingProvider = bindingProvider;
        this.absoluteReadLimit = absoluteReadLimit;
    }

    public InputStream getInputStream()
        throws IOException
    {
        return socket.getInputStream();
    }

    public OutputStream getOutputStream()
        throws IOException
    {
        return socket.getOutputStream();
    }

    public SSLSession getSession()
    {
        return socket.getSession();
    }

    public byte[] getTLSUnique()
    {
        if (isTLSUniqueAvailable())
        {
            return bindingProvider.getChannelBinding(socket, "tls-unique");
        }
        throw new IllegalStateException("No binding provider.");
    }

    public boolean isTLSUniqueAvailable()
    {
        return bindingProvider.canAccessChannelBinding(socket);
    }

    public void close()
        throws IOException
    {
        socket.close();
    }

    public Long getAbsoluteReadLimit()
    {
        return absoluteReadLimit;
    }
}