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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.tls;

import org.spongycastle.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;
    }

    long allocateSequenceNumber()
    {
        // TODO Check for overflow
        return sequenceNumber++;
    }

    TlsCipher getCipher()
    {
        return cipher;
    }

    int getEpoch()
    {
        return epoch;
    }

    DTLSReplayWindow getReplayWindow()
    {
        return replayWindow;
    }

    long getSequenceNumber()
    {
        return sequenceNumber;
    }
}