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diff --git a/include/llvm/Support/MD5.h b/include/llvm/Support/MD5.h
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+/*
+ * This code is derived from (original license follows):
+ *
+ * This is an OpenSSL-compatible implementation of the RSA Data Security, Inc.
+ * MD5 Message-Digest Algorithm (RFC 1321).
+ *
+ * Homepage:
+ * http://openwall.info/wiki/people/solar/software/public-domain-source-code/md5
+ *
+ * Author:
+ * Alexander Peslyak, better known as Solar Designer <solar at openwall.com>
+ *
+ * This software was written by Alexander Peslyak in 2001.  No copyright is
+ * claimed, and the software is hereby placed in the public domain.
+ * In case this attempt to disclaim copyright and place the software in the
+ * public domain is deemed null and void, then the software is
+ * Copyright (c) 2001 Alexander Peslyak and it is hereby released to the
+ * general public under the following terms:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted.
+ *
+ * There's ABSOLUTELY NO WARRANTY, express or implied.
+ *
+ * See md5.c for more information.
+ */
+
+#ifndef LLVM_SYSTEM_MD5_H
+#define LLVM_SYSTEM_MD5_H
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/DataTypes.h"
+
+namespace llvm {
+
+template <typename T> class ArrayRef;
+
+class MD5 {
+  // Any 32-bit or wider unsigned integer data type will do.
+  typedef uint32_t MD5_u32plus;
+
+  MD5_u32plus a, b, c, d;
+  MD5_u32plus hi, lo;
+  uint8_t buffer[64];
+  MD5_u32plus block[16];
+
+public:
+  typedef uint8_t MD5Result[16];
+
+  MD5();
+
+  /// \brief Updates the hash for the byte stream provided.
+  void update(ArrayRef<uint8_t> Data);
+
+  /// \brief Updates the hash for the StringRef provided.
+  void update(StringRef Str);
+
+  /// \brief Finishes off the hash and puts the result in result.
+  void final(MD5Result &result);
+
+  /// \brief Translates the bytes in \p Res to a hex string that is
+  /// deposited into \p Str. The result will be of length 32.
+  static void stringifyResult(MD5Result &Res, SmallString<32> &Str);
+
+private:
+  const uint8_t *body(ArrayRef<uint8_t> Data);
+};
+
+}
+
+#endif