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diff --git a/src/libstrongswan/plugins/sha3/sha3_keccak.h b/src/libstrongswan/plugins/sha3/sha3_keccak.h
new file mode 100644
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+++ b/src/libstrongswan/plugins/sha3/sha3_keccak.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2016 Andreas Steffen
+ * HSR Hochschule fuer Technik Rapperswil
+ *
+ * This program 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 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program 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.
+n */
+
+/**
+ * @defgroup sha3_keccak sha3_keccak
+ * @{ @ingroup sha3_p
+ */
+
+#ifndef SHA3_KECCAK_H_
+#define SHA3_KECCAK_H_
+
+typedef struct sha3_keccak_t sha3_keccak_t;
+
+#include <crypto/hashers/hasher.h>
+
+/**
+ * Implements the Keccak-f[1600] sponge function as defined by FIPS-202.
+ */
+struct sha3_keccak_t {
+
+	/**
+	 * Get the available rate in bytes
+	 *
+	 * @return			rate in bytes
+	 */
+	u_int (*get_rate)(sha3_keccak_t *this);
+
+	/**
+	 * Resets the internal Keccak state
+	 */
+	void (*reset)(sha3_keccak_t *this);
+
+	/**
+	 * Absorbs data into the Keccak state
+	 *
+	 * @param data		data to be absorbed
+	 */
+	void (*absorb)(sha3_keccak_t *this, chunk_t data);
+
+	/**
+	 * Finalize the absorption phase and switch to the squeeze phase
+	 */
+	void (*finalize)(sha3_keccak_t *this);
+
+	/**
+	 * Squeeze the Keccak state to get output data
+	 * Can be called multiple times
+	 *
+	 * @param out_len	number of output bytes requested
+	 * @param out		output buffer, must comprise at least out_len bytes
+	 */
+	void (*squeeze)(sha3_keccak_t *this, size_t out_len, uint8_t *out);
+
+	/**
+	 * Destroy the sha3_keccak_t object
+	 */
+	void (*destroy)(sha3_keccak_t *this);
+
+};
+
+/**
+ * Creates a new sha3_keccak_t.
+ *
+ * @param	capacity		required capacity to achieve a given security level
+ * @param delimited_suffix	bits delimiting the input message
+ * @return					sha3_keccak_t object, NULL if capacity too big
+ */
+sha3_keccak_t *sha3_keccak_create(u_int capacity, uint8_t delimited_suffix);
+
+#endif /** SHA3_KECCAK_H_ @}*/