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diff --git a/net/http/md4.h b/net/http/md4.h
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+// This is mozilla/security/manager/ssl/src/md4.h, CVS rev. 1.1, with trivial
+// changes to port it to our source tree.
+//
+// WARNING: MD4 is cryptographically weak.  Do not use MD4 except in NTLM
+// authentication.
+
+/* vim:set ts=2 sw=2 et cindent: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla.
+ *
+ * The Initial Developer of the Original Code is IBM Corporation.
+ * Portions created by IBM Corporation are Copyright (C) 2003
+ * IBM Corporation. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Darin Fisher <darin@meer.net>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef NET_HTTP_MD4_H_
+#define NET_HTTP_MD4_H_
+
+#include "base/basictypes.h"
+
+namespace net {
+namespace weak_crypto {
+
+/**
+ * MD4Sum - computes the MD4 sum over the input buffer per RFC 1320
+ * 
+ * @param input
+ *        buffer containing input data
+ * @param inputLen
+ *        length of input buffer (number of bytes)
+ * @param result
+ *        16-byte buffer that will contain the MD4 sum upon return
+ *
+ * NOTE: MD4 is superceded by MD5.  do not use MD4 unless required by the
+ * protocol you are implementing (e.g., NTLM requires MD4).
+ *
+ * NOTE: this interface is designed for relatively small buffers.  A streaming
+ * interface would make more sense if that were a requirement.  Currently, this
+ * is good enough for the applications we care about.
+ */
+void MD4Sum(const uint8 *input, uint32 inputLen, uint8 *result);
+
+}  // namespace net::weak_crypto
+}  // namespace net
+
+#endif  // NET_HTTP_MD4_H_