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diff --git a/intern/cycles/util/util_md5.h b/intern/cycles/util/util_md5.h
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+++ b/intern/cycles/util/util_md5.h
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+/*
+ * Copyright (C) 1999, 2002 Aladdin Enterprises.  All rights reserved.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * L. Peter Deutsch
+ * ghost@aladdin.com
+ */
+
+/* MD5
+ *
+ * Simply MD5 hash computation, used by disk cache. Adapted from external
+ * code, with minor code modifications done to remove some unused code and
+ * change code style. */
+
+#ifndef __UTIL_MD5_H__
+#define __UTIL_MD5_H__
+
+#include "util_string.h"
+#include "util_types.h"
+
+CCL_NAMESPACE_BEGIN
+
+class MD5Hash {
+public:
+	MD5Hash();
+	~MD5Hash();
+
+	void append(const uint8_t *data, int size);
+	bool append_file(const string& filepath);
+	string get_hex();
+
+protected:
+	void process(const uint8_t *data);
+	void finish(uint8_t digest[16]);
+
+    uint32_t count[2]; /* message length in bits, lsw first */
+    uint32_t abcd[4]; /* digest buffer */
+    uint8_t buf[64]; /* accumulate block */
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __UTIL_MD5_H__ */
+