1 files changed, 53 insertions, 0 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSEpoch.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSEpoch.java
new file mode 100644
index 000000000..6d87f9a5c
--- /dev/null
+++ b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/tls/DTLSEpoch.java
@@ -0,0 +1,53 @@
+package org.spongycastle.crypto.tls;
+
+class DTLSEpoch
+{
+
+    private final DTLSReplayWindow replayWindow = new DTLSReplayWindow();
+
+    private final int epoch;
+    private final TlsCipher cipher;
+
+    private long sequence_number = 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 sequence_number++;
+    }
+
+    TlsCipher getCipher()
+    {
+        return cipher;
+    }
+
+    int getEpoch()
+    {
+        return epoch;
+    }
+
+    DTLSReplayWindow getReplayWindow()
+    {
+        return replayWindow;
+    }
+
+    long getSequence_number()
+    {
+        return sequence_number;
+    }
+}