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+/*
+ * Ouroboros - Copyright (C) 2016 - 2017
+ *
+ * SHA3 algorithm
+ *
+ * Dimitri Staessens <dimitri.staessens@ugent.be>
+ * Sander Vrijders <sander.vrijders@ugent.be>
+ *
+ * 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, Michaƫl Peeters and Gilles Van Assche
+ *
+ * Copyright: 2013 Aleksey Kravchenko <rhash.admin@gmail.com>
+ *
+ * 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 */