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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.
+ */
+/* This is derived from material copyright RSA Data Security, Inc.
+ * Their notice is reproduced below in its entirety.
+ *
+ * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
+ * rights reserved.
+ *
+ * License to copy and use this software is granted provided that it
+ * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
+ * Algorithm" in all material mentioning or referencing this software
+ * or this function.
+ *
+ * License is also granted to make and use derivative works provided
+ * that such works are identified as "derived from the RSA Data
+ * Security, Inc. MD4 Message-Digest Algorithm" in all material
+ * mentioning or referencing the derived work.
+ *
+ * RSA Data Security, Inc. makes no representations concerning either
+ * the merchantability of this software or the suitability of this
+ * software for any particular purpose. It is provided "as is"
+ * without express or implied warranty of any kind.
+ *
+ * These notices must be retained in any copies of any part of this
+ * documentation and/or software.
+ */
+
+#ifndef APR_MD4_H
+#define APR_MD4_H
+
+#include "apu.h"
+#include "apr_xlate.h"
+/**
+ * @file apr_md4.h
+ * @brief APR-UTIL MD4 Library
+ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup APR_Util_MD4 MD4 Library
+ * @ingroup APR_Util
+ * @{
+ */
+
+/** The digestsize for MD4 */
+#define APR_MD4_DIGESTSIZE 16
+
+/** @see apr_md4_ctx_t */
+typedef struct apr_md4_ctx_t apr_md4_ctx_t;
+
+/** MD4 context. */
+struct apr_md4_ctx_t {
+    /** state (ABCD) */
+    apr_uint32_t state[4];
+    /** number of bits, modulo 2^64 (lsb first) */
+    apr_uint32_t count[2];
+    /** input buffer */
+    unsigned char buffer[64];
+#if APR_HAS_XLATE
+    /** translation handle */
+    apr_xlate_t *xlate;
+#endif
+};
+
+/**
+ * MD4 Initialize.  Begins an MD4 operation, writing a new context.
+ * @param context The MD4 context to initialize.
+ */
+APU_DECLARE(apr_status_t) apr_md4_init(apr_md4_ctx_t *context);
+
+#if APR_HAS_XLATE
+/**
+ * MDr4 translation setup.  Provides the APR translation handle to be used 
+ * for translating the content before calculating the digest.
+ * @param context The MD4 content to set the translation for.
+ * @param xlate The translation handle to use for this MD4 context 
+ */
+APU_DECLARE(apr_status_t) apr_md4_set_xlate(apr_md4_ctx_t *context,
+                                            apr_xlate_t *xlate);
+#else
+#define apr_md4_set_xlate(context, xlate) APR_ENOTIMPL
+#endif
+
+/**
+ * MD4 block update operation.  Continue an MD4 message-digest operation, 
+ * processing another message block, and updating the context.
+ * @param context The MD4 content to update.
+ * @param input next message block to update
+ * @param inputLen The length of the next message block
+ */
+APU_DECLARE(apr_status_t) apr_md4_update(apr_md4_ctx_t *context,
+                                         const unsigned char *input,
+                                         apr_size_t inputLen);
+
+/**
+ * MD4 finalization.  Ends an MD4 message-digest operation, writing the 
+ * message digest and zeroing the context
+ * @param digest The final MD4 digest
+ * @param context The MD4 content we are finalizing.
+ */
+APU_DECLARE(apr_status_t) apr_md4_final(
+                                    unsigned char digest[APR_MD4_DIGESTSIZE],
+                                    apr_md4_ctx_t *context);
+
+/**
+ * MD4 digest computation
+ * @param digest The MD4 digest
+ * @param input message block to use
+ * @param inputLen The length of the message block
+ */
+APU_DECLARE(apr_status_t) apr_md4(unsigned char digest[APR_MD4_DIGESTSIZE],
+                                  const unsigned char *input,
+                                  apr_size_t inputLen);
+
+/** @} */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !APR_MD4_H */