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diff --git a/util/include/axutil_digest_calc.h b/util/include/axutil_digest_calc.h
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef AXUTIL_DIGEST_CALC_H
+#define AXUTIL_DIGEST_CALC_H
+
+/**
+ * @file axutil_digest_calc.h
+ * @brief implements the calculations of H(A1), H(A2),
+ * request-digest and response-digest for Axis2 based on rfc2617.
+ */
+
+#include <axutil_utils_defines.h>
+#include <axutil_env.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /** 
+     * @defgroup axis2_util utilities
+     * @ingroup axis2
+     * @{
+     * @}
+     */
+
+    /**
+     * @defgroup axutil_digest_calc digest_calc
+     * @ingroup axis2_util
+     * @{
+     */
+
+    #define AXIS2_DIGEST_HASH_LEN 16
+    #define AXIS2_DIGEST_HASH_HEX_LEN 32
+
+    typedef unsigned char axutil_digest_hash_t[AXIS2_DIGEST_HASH_LEN];
+    typedef unsigned char axutil_digest_hash_hex_t[AXIS2_DIGEST_HASH_HEX_LEN + 1];
+
+    /**
+      * calculate H(A1) as per HTTP Digest spec
+      * @param env, pointer to env struct
+      * @param algorithm, algorithm
+      * @param user_name, user name
+      * @param realm, reaalm
+      * @param password, password
+      * @param nonce, nonce from server
+      * @param cnonce, client nonce
+      * @param session_key, H(A1)
+      * @return AXIS2_SUCCESS on success or AXIS2_FAILURE
+      */
+    AXIS2_EXTERN axis2_status_t AXIS2_CALL
+    axutil_digest_calc_get_h_a1(
+        const axutil_env_t * env,
+        char * algorithm,               
+        char * user_name,              
+        char * realm,                 
+        char * password,             
+        char * nonce,               
+        char * cnonce,             
+        axutil_digest_hash_hex_t session_key); 
+
+    /** 
+      * calculate request-digest/response-digest as per HTTP Digest spec 
+      * @param env, pointer to env struct
+      * @param h_a1, H(A1)
+      * @param nonce, nonce from server
+      * @param cnonce, client nonce
+      * @param qop, qop-value: "", "auth", "auth-int"
+      * @param method, method from the request
+      * @param digest_uri, requested URL 
+      * @param h_entry, H(entity body) if qop="auth-int"
+      * @param response, request-digest or response-digest
+      * @return AXIS2_SUCCESS on success or AXIS2_FAILURE
+      */
+    AXIS2_EXTERN axis2_status_t AXIS2_CALL
+    axutil_digest_calc_get_response(
+        const axutil_env_t * env,
+        axutil_digest_hash_hex_t h_a1,                       
+        char * nonce,                      
+        char * nonce_count,               
+        char * cnonce,                   
+        char * qop,                     
+        char * method,                 
+        char * digest_uri,            
+        axutil_digest_hash_hex_t h_entity,  
+        axutil_digest_hash_hex_t response); 
+
+    /** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* AXIS2_DIGEST_CALC_H */