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diff --git a/src/libzrtpcpp/crypto/hmac256.h b/src/libzrtpcpp/crypto/hmac256.h
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+/*
+  Copyright (C) 2006, 2005, 2004 Erik Eliasson, Johan Bilien, Werner Dittmann
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+*/
+
+/**
+ * Methods to compute a SHA256 HMAC.
+ *
+ * @author Erik Eliasson <eliasson@it.kth.se>
+ * @author Johan Bilien <jobi@via.ecp.fr>
+ * @author Werner Dittmann <Werner.Dittmann@t-online.de>
+ */
+
+#ifndef HMAC_SHA256_H
+#define HMAC_SHA256_H
+
+/**
+ * @file hmac256.h
+ * @brief Function that provide SHA256 HMAC support
+ * 
+ * @ingroup GNU_ZRTP
+ * @{
+ */
+
+#include <stdint.h>
+
+#ifndef SHA256_DIGEST_LENGTH
+#define SHA256_DIGEST_LENGTH 32
+#endif
+
+/**
+ * Compute SHA256 HMAC.
+ *
+ * This functions takes one data chunk and computes its SHA256 HMAC.
+ *
+ * @param key
+ *    The MAC key.
+ * @param key_length
+ *    Lneght of the MAC key in bytes
+ * @param data
+ *    Points to the data chunk.
+ * @param data_length
+ *    Length of the data in bytes
+ * @param mac
+ *    Points to a buffer that receives the computed digest. This
+ *    buffer must have a size of at least 32 bytes (SHA256_DIGEST_LENGTH).
+ * @param mac_length
+ *    Point to an integer that receives the length of the computed HMAC.
+ */
+void hmac_sha256( uint8_t* key, uint32_t key_length,
+    uint8_t* data, int32_t data_length,
+    uint8_t* mac, uint32_t* mac_length );
+
+/**
+ * Compute SHA256 HMAC over several data cunks.
+ *
+ * This functions takes several data chunk and computes the SHA256 HAMAC. It
+ * uses the openSSL HAMAC SHA256 implementation.
+ *
+ * @param key
+ *    The MAC key.
+ * @param key_length
+ *    Lneght of the MAC key in bytes
+ * @param data
+ *    Points to an array of pointers that point to the data chunks. A NULL
+ *    pointer in an array element terminates the data chunks.
+ * @param data_length
+ *    Points to an array of integers that hold the length of each data chunk.
+ * @param mac
+ *    Points to a buffer that receives the computed digest. This
+ *    buffer must have a size of at least 32 bytes (SHA256_DIGEST_LENGTH).
+ * @param mac_length
+ *    Point to an integer that receives the length of the computed HMAC.
+ */
+
+void hmac_sha256( uint8_t* key, uint32_t key_length,
+                           uint8_t* data[], uint32_t data_length[],
+                           uint8_t* mac, uint32_t* mac_length );
+/**
+ * @}
+ */
+#endif