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diff --git a/libdevcore/Keccak256.h b/libdevcore/Keccak256.h
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+/*
+	This file is part of solidity.
+
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file SHA3.h
+ * @author Gav Wood <i@gavwood.com>
+ * @date 2014
+ *
+ * The FixedHash fixed-size "hash" container type.
+ */
+
+#pragma once
+
+#include <libdevcore/FixedHash.h>
+
+#include <string>
+
+namespace dev
+{
+
+/// Calculate Keccak-256 hash of the given input, returning as a 256-bit hash.
+h256 keccak256(bytesConstRef _input);
+
+/// Calculate Keccak-256 hash of the given input, returning as a 256-bit hash.
+inline h256 keccak256(bytes const& _input) { return keccak256(bytesConstRef(&_input)); }
+
+/// Calculate Keccak-256 hash of the given input (presented as a binary-filled string), returning as a 256-bit hash.
+inline h256 keccak256(std::string const& _input) { return keccak256(bytesConstRef(_input)); }
+
+/// Calculate Keccak-256 hash of the given input (presented as a FixedHash), returns a 256-bit hash.
+template<unsigned N> inline h256 keccak256(FixedHash<N> const& _input) { return keccak256(_input.ref()); }
+
+}