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diff --git a/src/main/cpp/util/md5.h b/src/main/cpp/util/md5.h
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+++ b/src/main/cpp/util/md5.h
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+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed 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.
+// Provides a fast MD5 implementation.
+//
+// This implementation saves us from linking huge OpenSSL library.
+
+#ifndef DEVTOOLS_BLAZE_MAIN_UTIL_MD5_H_
+#define DEVTOOLS_BLAZE_MAIN_UTIL_MD5_H_
+
+#include <string>
+
+#include "util/port.h"
+
+namespace blaze_util {
+
+using std::string;
+
+// The <code>Context</code> class performs the actual MD5
+// computation. It works incrementally and can be fed a single byte at
+// a time if desired.
+class Md5Digest {
+ public:
+  Md5Digest();
+
+  Md5Digest(const Md5Digest& original);
+
+  // the MD5 digest is always 128 bits = 16 bytes
+  static const int kDigestLength = 16;
+
+  // Resets the context so that it can be used to calculate another
+  // MD5 digest. The context is in the same state as if it had just
+  // been constructed. It is unnecessary to call <code>Reset</code> on
+  // a newly created context.
+  void Reset();
+
+  // Add <code>length</code> bytes of <code>buf</code> to the MD5
+  // digest.
+  void Update(const void *buf, unsigned int length);
+
+  // Retrieve the computed MD5 digest as a 16 byte array.
+  void Finish(unsigned char* digest);
+
+  // Produces a hexadecimal string representation of this digest in the form:
+  // [0-9a-f]{32}
+  string String() const;
+
+ private:
+  void Transform(const unsigned char* buffer, unsigned int len);
+
+ private:
+  unsigned int state[4];          // state (ABCD)
+  unsigned int count[2];          // number of bits, modulo 2^64 (lsb first)
+  unsigned char ctx_buffer[128];  // input buffer
+  unsigned int ctx_buffer_len;
+};
+
+}  // namespace blaze_util
+
+
+#endif  // DEVTOOLS_BLAZE_MAIN_UTIL_MD5_H_