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diff --git a/gr-digital/include/gnuradio/digital/crc32_async_bb.h b/gr-digital/include/gnuradio/digital/crc32_async_bb.h
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+++ b/gr-digital/include/gnuradio/digital/crc32_async_bb.h
@@ -0,0 +1,70 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2014 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_ASYNC_BB_H
+#define INCLUDED_DIGITAL_CRC32_ASYNC_BB_H
+
+#include <gnuradio/digital/api.h>
+#include <gnuradio/block.h>
+
+namespace gr {
+  namespace digital {
+
+    /*!
+     * \brief Byte-stream CRC block for async messages
+     * \ingroup packet_operators_blk
+     *
+     * \details
+     *
+     * Processes packets (as async PDU messages) for CRC32. The \p
+     * check parameter determines if the block acts to check and strip
+     * the CRC or to calculate and append the CRC32.
+     *
+     * The input PDU is expected to be a message of packet bytes.
+     *
+     * When using check mode, if the CRC passes, the output is a
+     * payload of the message with the CRC stripped, so the output
+     * will be 4 bytes smaller than the input.
+     *
+     * When using calculate mode (check == false), then the CRC is
+     * calculated on the PDU and appended to it. The output is then 4
+     * bytes longer than the input.
+     *
+     * This block implements the CRC32 using the Boost crc_optimal
+     * class for 32-bit CRCs with the standard generator 0x04C11DB7.
+     */
+    class DIGITAL_API crc32_async_bb : virtual public block
+    {
+     public:
+      typedef boost::shared_ptr<crc32_async_bb> sptr;
+
+      /*!
+       * \param check Set to true if you want to check CRC, false to create CRC.
+       */
+      static sptr make(bool check=false);
+    };
+
+  } // namespace digital
+} // namespace gr
+
+#endif /* INCLUDED_DIGITAL_CRC32_ASYNC_BB_H */