init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Crypto/Tls/DtlsEpoch.cs

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+using System;
+
+namespace Org.BouncyCastle.Crypto.Tls;
+
+internal class DtlsEpoch
+{
+	private readonly DtlsReplayWindow mReplayWindow = new DtlsReplayWindow();
+
+	private readonly int mEpoch;
+
+	private readonly TlsCipher mCipher;
+
+	private long mSequenceNumber = 0L;
+
+	internal TlsCipher Cipher => mCipher;
+
+	internal int Epoch => mEpoch;
+
+	internal DtlsReplayWindow ReplayWindow => mReplayWindow;
+
+	internal long SequenceNumber => mSequenceNumber;
+
+	internal DtlsEpoch(int epoch, TlsCipher cipher)
+	{
+		if (epoch < 0)
+		{
+			throw new ArgumentException("must be >= 0", "epoch");
+		}
+		if (cipher == null)
+		{
+			throw new ArgumentNullException("cipher");
+		}
+		mEpoch = epoch;
+		mCipher = cipher;
+	}
+
+	internal long AllocateSequenceNumber()
+	{
+		return mSequenceNumber++;
+	}
+}