First check in.

client/loclass/cipher.h

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+/*****************************************************************************
+ * This file is part of iClassCipher. It is a reconstructon of the cipher engine
+ * used in iClass, and RFID techology.
+ *
+ * The implementation is based on the work performed by
+ * Flavio D. Garcia, Gerhard de Koning Gans, Roel Verdult and
+ * Milosch Meriac in the paper "Dismantling IClass".
+ *
+ * Copyright (C) 2014 Martin Holst Swende
+ *
+ * This is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This file 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 IClassCipher.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+#ifndef CIPHER_H
+#define CIPHER_H
+#include <stdint.h>
+
+void doMAC(uint8_t *cc_nr_p, int length, uint8_t *div_key_p, uint8_t mac[4]);
+int testMAC();
+
+#endif // CIPHER_H