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diff --git a/tos/chips/cc2420/interfaces/CC2420SecurityMode.nc b/tos/chips/cc2420/interfaces/CC2420SecurityMode.nc
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+++ b/tos/chips/cc2420/interfaces/CC2420SecurityMode.nc
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+/*
+* Copyright (c) 2008 Johns Hopkins University.
+* All rights reserved.
+*
+* Permission to use, copy, modify, and distribute this software and its
+* documentation for any purpose, without fee, and without written
+* agreement is hereby granted, provided that the above copyright
+* notice, the (updated) modification history and the author appear in
+* all copies of this source code.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  `AS IS'
+* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED  TO, THE
+* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR  PURPOSE
+* ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR  CONTRIBUTORS
+* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, LOSS OF USE,  DATA,
+* OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR  OTHERWISE)
+* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+* THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/**
+ * @author JeongGil Ko
+ * @author Razvan Musaloiu-E.
+ * @author Jong Hyun Lim
+ */
+
+interface CC2420SecurityMode
+{
+  command error_t setCtr(message_t* msg, uint8_t setKey, uint8_t setSkip);
+  // Valid sizes are: 4, 6, 8, 10, 12, 14, 16
+  command error_t setCbcMac(message_t* msg, uint8_t setKey, uint8_t setSkip, uint8_t size);
+  command error_t setCcm(message_t* msg, uint8_t setKey, uint8_t setSkip, uint8_t size);
+}