Support for Signal calls.

Merge in RedPhone

// FREEBIE

src/org/thoughtcrime/redphone/crypto/zrtp/DHPartOnePacket.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2011 Whisper Systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.thoughtcrime.redphone.crypto.zrtp;
+
+import org.thoughtcrime.redphone.crypto.zrtp.retained.RetainedSecretsDerivatives;
+import org.thoughtcrime.redphone.network.RtpPacket;
+
+/**
+ * DH part one ZRTP handshake packet.
+ *
+ * @author Moxie Marlinspike
+ *
+ */
+
+public abstract class DHPartOnePacket extends DHPacket {
+  public static final String TYPE = "DHPart1 ";
+
+  public DHPartOnePacket(RtpPacket packet, int agreementType) {
+    super(packet, agreementType);
+  }
+
+  public DHPartOnePacket(RtpPacket packet, int agreementType, boolean deepCopy) {
+    super(packet, agreementType, deepCopy);
+  }
+
+  public DHPartOnePacket(int agreementType, HashChain hashChain, byte[] pvr,
+                         RetainedSecretsDerivatives retainedSecrets,
+                         boolean includeLegacyHeaderBug)
+  {
+    super(TYPE, agreementType, hashChain, pvr, retainedSecrets, includeLegacyHeaderBug);
+  }
+}