--- /dev/null
+/*****************************************************************************
+ * 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 CIPHERUTILS_H
+#define CIPHERUTILS_H
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+typedef struct {
+ uint8_t * buffer;
+ uint8_t numbits;
+ uint8_t position;
+} BitstreamIn;
+
+typedef struct {
+ uint8_t * buffer;
+ uint8_t numbits;
+ uint8_t position;
+}BitstreamOut;
+
+bool headBit( BitstreamIn *stream);
+bool tailBit( BitstreamIn *stream);
+void pushBit( BitstreamOut *stream, bool bit);
+int bitsLeft( BitstreamIn *stream);
+
+int testCipherUtils(void);
+int testMAC();
+void push6bits( BitstreamOut* stream, uint8_t bits);
+void EncryptDES(bool key[56], bool outBlk[64], bool inBlk[64], int verbose) ;
+void x_num_to_bytes(uint64_t n, size_t len, uint8_t* dest);
+uint64_t x_bytes_to_num(uint8_t* src, size_t len);
+uint8_t reversebytes(uint8_t b);
+void reverse_arraybytes(uint8_t* arr, size_t len);
+void reverse_arraycopy(uint8_t* arr, uint8_t* dest, size_t len);
+void printarr(char * name, uint8_t* arr, int len);
+void printvar(char * name, uint8_t* arr, int len);
+void printarr_human_readable(char * title, uint8_t* arr, int len);
+#endif // CIPHERUTILS_H