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diff --git a/include/ouroboros/sha3.h b/include/ouroboros/sha3.h
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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * SHA3 algorithm
+ *
+ *    Dimitri Staessens <[email protected]>
+ *    Sander Vrijders   <[email protected]>
+ *
+ * This implementation is adapted and redistributed from the RHASH
+ * project implementation of the sha3 algorithm
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ *    -- original license
+ *
+ * sha3.c - an implementation of Secure Hash Algorithm 3 (Keccak).
+ * based on the
+ * The Keccak SHA-3 submission. Submission to NIST (Round 3), 2011
+ * by Guido Bertoni, Joan Daemen, Michaël Peeters and Gilles Van Assche
+ *
+ * Copyright: 2013 Aleksey Kravchenko <[email protected]>
+ *
+ * Permission is hereby granted,  free of charge,  to any person  obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction,  including without limitation
+ * the rights to  use, copy, modify,  merge, publish, distribute, sublicense,
+ * and/or sell copies  of  the Software,  and to permit  persons  to whom the
+ * Software is furnished to do so.
+ *
+ * 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.  Use this program  at  your own risk!
+ */
+
+#ifndef OUROBOROS_SHA3_H
+#define OUROBOROS_SHA3_H
+
+#include <unistd.h>
+#include <stdint.h>
+
+#define SHA3_224_HASH_LEN         28
+#define SHA3_256_HASH_LEN         32
+#define SHA3_384_HASH_LEN         48
+#define SHA3_512_HASH_LEN         64
+#define SHA3_MAX_PERMUTATION_SIZE 25
+#define SHA3_MAX_RATE_IN_QWORDS   24
+
+struct sha3_ctx {
+        /* 1600 bits algorithm hashing state */
+        uint64_t hash[SHA3_MAX_PERMUTATION_SIZE];
+        /* 1536-bit buffer for leftovers */
+        uint64_t message[SHA3_MAX_RATE_IN_QWORDS];
+        /* count of bytes in the message[] buffer */
+        unsigned rest;
+        /* size of a message block processed at once */
+        unsigned block_size;
+};
+
+void rhash_sha3_224_init(struct sha3_ctx * ctx);
+
+void rhash_sha3_256_init(struct sha3_ctx * ctx);
+
+void rhash_sha3_384_init(struct sha3_ctx * ctx);
+
+void rhash_sha3_512_init(struct sha3_ctx * ctx);
+
+void rhash_sha3_update(struct sha3_ctx * ctx,
+                       const void    *   msg,
+                       size_t            size);
+
+void rhash_sha3_final(struct sha3_ctx * ctx,
+                      uint8_t *         res);
+
+#endif /* OUROBOROS_SHA3_H */