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diff --git a/pjlib-util/include/pjlib-util/crc32.h b/pjlib-util/include/pjlib-util/crc32.h
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+++ b/pjlib-util/include/pjlib-util/crc32.h
@@ -0,0 +1,96 @@
+/* $Id: crc32.h 3553 2011-05-05 06:14:19Z nanang $ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJLIB_UTIL_CRC32_H__
+#define __PJLIB_UTIL_CRC32_H__
+
+/**
+ * @file crc32.h
+ * @brief CRC32 implementation
+ */
+
+#include <pjlib-util/types.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup PJLIB_UTIL_CRC32 CRC32 (Cyclic Redundancy Check)
+ * @ingroup PJLIB_UTIL_ENCRYPTION
+ * @{
+ * This implements CRC32 algorithm. See ITU-T V.42 for the formal 
+ * specification.
+ */
+
+/** CRC32 context. */
+typedef struct pj_crc32_context
+{
+    pj_uint32_t	crc_state;	/**< Current state. */
+} pj_crc32_context;
+
+
+/**
+ * Initialize CRC32 context.
+ *
+ * @param ctx	    CRC32 context.
+ */
+PJ_DECL(void) pj_crc32_init(pj_crc32_context *ctx);
+
+/**
+ * Feed data incrementally to the CRC32 algorithm.
+ *
+ * @param ctx	    CRC32 context.
+ * @param data	    Input data.
+ * @param nbytes    Length of the input data.
+ *
+ * @return	    The current CRC32 value.
+ */
+PJ_DECL(pj_uint32_t) pj_crc32_update(pj_crc32_context *ctx, 
+				     const pj_uint8_t *data,
+				     pj_size_t nbytes);
+
+/**
+ * Finalize CRC32 calculation and retrieve the CRC32 value.
+ *
+ * @param ctx	    CRC32 context.
+ *
+ * @return	    The current CRC value.
+ */
+PJ_DECL(pj_uint32_t) pj_crc32_final(pj_crc32_context *ctx);
+
+/**
+ * Perform one-off CRC32 calculation to the specified data.
+ *
+ * @param data	    Input data.
+ * @param nbytes    Length of input data.
+ *
+ * @return	    CRC value of the data.
+ */
+PJ_DECL(pj_uint32_t) pj_crc32_calc(const pj_uint8_t *data,
+				   pj_size_t nbytes);
+
+
+/**
+ * @}
+ */
+
+PJ_END_DECL
+
+
+#endif	/* __PJLIB_UTIL_CRC32_H__ */
+