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diff --git a/src/lib/cryptolink/crypto_rng.h b/src/lib/cryptolink/crypto_rng.h
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+++ b/src/lib/cryptolink/crypto_rng.h
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+// Copyright (C) 2018 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <boost/noncopyable.hpp>
+
+#include <cryptolink/cryptolink.h>
+
+#ifndef ISC_CRYPTO_RNG_H
+#define ISC_CRYPTO_RNG_H
+
+namespace isc {
+namespace cryptolink {
+
+/// \brief RNG support
+///
+/// This class is used to get the RNG.
+/// The global instance can be get with CryptoLink::getRNG()
+///
+class RNG : private boost::noncopyable {
+public:
+    /// \brief Constructor from a Random Number Generator
+    ///
+    /// \exception LibraryError if there was any unexpected exception
+    ///                         in the underlying library
+    RNG();
+
+    /// \brief Destructor
+    virtual ~RNG();
+
+    /// \brief Generate random value.
+    ///
+    /// The result will be returned as a std::vector<uint8_t>
+    ///
+    /// \exception LibraryError if there was any unexpected exception
+    ///                         in the underlying library
+    ///
+    /// \param len The number of bytes from the result to generate.
+    /// \return a vector containing random value.
+    virtual std::vector<uint8_t> random(size_t len) = 0;
+
+private:
+    friend RNGPtr& CryptoLink::getRNG();
+};
+
+/// \brief Generate random value. 
+///
+/// This is a convenience function that generate random data
+/// given a fixed amount of data. Internally it does the same as
+/// creating an RNG object and generating the resulting value.
+///
+/// \exception LibraryError if there was any unexpected exception
+///                         in the underlying library
+///
+/// \param len The length of the data
+std::vector<uint8_t> random(size_t len);
+
+} // namespace cryptolink
+} // namespace isc
+
+#endif // ISC_CRYPTO_RNG_H
+