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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 org.bouncycastle.tls.crypto.TlsCipher;

class DTLSEpoch
{
    private final DTLSReplayWindow replayWindow = new DTLSReplayWindow();

    private final int epoch;
    private final TlsCipher cipher;

    private long sequenceNumber = 0;

    DTLSEpoch(int epoch, TlsCipher cipher)
    {
        if (epoch < 0)
        {
            throw new IllegalArgumentException("'epoch' must be >= 0");
        }
        if (cipher == null)
        {
            throw new IllegalArgumentException("'cipher' cannot be null");
        }

        this.epoch = epoch;
        this.cipher = cipher;
    }

    synchronized long allocateSequenceNumber() throws IOException
    {
        if (sequenceNumber >= (1L << 48))
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }

        return sequenceNumber++;
    }

    TlsCipher getCipher()
    {
        return cipher;
    }

    int getEpoch()
    {
        return epoch;
    }

    DTLSReplayWindow getReplayWindow()
    {
        return replayWindow;
    }

    synchronized long getSequenceNumber()
    {
        return sequenceNumber;
    }

    synchronized void setSequenceNumber(long sequenceNumber)
    {
        this.sequenceNumber = sequenceNumber;
    }
}