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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.IOException;
import java.io.InterruptedIOException;

public class DTLSTransport
    implements DatagramTransport
{
    private final DTLSRecordLayer recordLayer;

    DTLSTransport(DTLSRecordLayer recordLayer)
    {
        this.recordLayer = recordLayer;
    }

    public int getReceiveLimit()
        throws IOException
    {
        return recordLayer.getReceiveLimit();
    }

    public int getSendLimit()
        throws IOException
    {
        return recordLayer.getSendLimit();
    }

    public int receive(byte[] buf, int off, int len, int waitMillis)
        throws IOException
    {
        return receive(buf, off, len, waitMillis, null);
    }

    public int receive(byte[] buf, int off, int len, int waitMillis, DTLSRecordCallback recordCallback)    
        throws IOException
    {
        if (null == buf)
        {
            throw new NullPointerException("'buf' cannot be null");
        }
        if (off < 0 || off >= buf.length)
        {
            throw new IllegalArgumentException("'off' is an invalid offset: " + off);
        }
        if (len < 0 || len > buf.length - off)
        {
            throw new IllegalArgumentException("'len' is an invalid length: " + len);
        }
        if (waitMillis < 0)
        {
            throw new IllegalArgumentException("'waitMillis' cannot be negative");
        }

        try
        {
            return recordLayer.receive(buf, off, len, waitMillis, recordCallback);
        }
        catch (TlsFatalAlert fatalAlert)
        {
            if (AlertDescription.bad_record_mac == fatalAlert.getAlertDescription())
            {
                return -1;
            }

            recordLayer.fail(fatalAlert.getAlertDescription());
            throw fatalAlert;
        }
        catch (InterruptedIOException e)
        {
            throw e;
        }
        catch (IOException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw e;
        }
        catch (RuntimeException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }
    }

    public int receivePending(byte[] buf, int off, int len)
        throws IOException
    {
        return receivePending(buf, off, len, null);
    }

    public int receivePending(byte[] buf, int off, int len, DTLSRecordCallback recordCallback)    
        throws IOException
    {
        if (null == buf)
        {
            throw new NullPointerException("'buf' cannot be null");
        }
        if (off < 0 || off >= buf.length)
        {
            throw new IllegalArgumentException("'off' is an invalid offset: " + off);
        }
        if (len < 0 || len > buf.length - off)
        {
            throw new IllegalArgumentException("'len' is an invalid length: " + len);
        }

        try
        {
            return recordLayer.receivePending(buf, off, len, recordCallback);
        }
        catch (TlsFatalAlert fatalAlert)
        {
            if (AlertDescription.bad_record_mac == fatalAlert.getAlertDescription())
            {
                return -1;
            }

            recordLayer.fail(fatalAlert.getAlertDescription());
            throw fatalAlert;
        }
        catch (InterruptedIOException e)
        {
            throw e;
        }
        catch (IOException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw e;
        }
        catch (RuntimeException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }
    }

    public void send(byte[] buf, int off, int len)
        throws IOException
    {
        if (null == buf)
        {
            throw new NullPointerException("'buf' cannot be null");
        }
        if (off < 0 || off >= buf.length)
        {
            throw new IllegalArgumentException("'off' is an invalid offset: " + off);
        }
        if (len < 0 || len > buf.length - off)
        {
            throw new IllegalArgumentException("'len' is an invalid length: " + len);
        }

        try
        {
            recordLayer.send(buf, off, len);
        }
        catch (TlsFatalAlert fatalAlert)
        {
            recordLayer.fail(fatalAlert.getAlertDescription());
            throw fatalAlert;
        }
        catch (InterruptedIOException e)
        {
            throw e;
        }
        catch (IOException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw e;
        }
        catch (RuntimeException e)
        {
            recordLayer.fail(AlertDescription.internal_error);
            throw new TlsFatalAlert(AlertDescription.internal_error, e);
        }
    }

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