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diff --git a/gr-digital/include/digital_crc32.h b/gr-digital/include/digital_crc32.h
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+++ b/gr-digital/include/digital_crc32.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2011 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_DIGITAL_CRC32_H
+#define INCLUDED_DIGITAL_CRC32_H
+
+#include <string>
+#include <gr_types.h>
+
+/*!
+ * \brief update running CRC-32
+ * \ingroup digital
+ *
+ * Update a running CRC with the bytes buf[0..len-1] The CRC should be
+ * initialized to all 1's, and the transmitted value is the 1's
+ * complement of the final running CRC.  The resulting CRC should be
+ * transmitted in big endian order.
+ */
+unsigned int 
+digital_update_crc32(unsigned int crc, const unsigned char *buf, size_t len);
+
+unsigned int 
+digital_update_crc32(unsigned int crc, const std::string buf);
+
+unsigned int 
+digital_crc32(const unsigned char *buf, size_t len);
+
+unsigned int 
+digital_crc32(const std::string buf);
+
+#endif /* INCLUDED_CRC32_H */