sha3.h

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// Copyright (c) 2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_CRYPTO_SHA3_H
#define BITCOIN_CRYPTO_SHA3_H
 
#include <span.h>
 
#include <cstdint>
#include <cstdlib>
 
void KeccakF(uint64_t (&st)[25]);
 
class SHA3_256 {
private:
    uint64_t m_state[25] = {0};
    uint8_t m_buffer[8];
    unsigned m_bufsize = 0;
    unsigned m_pos = 0;
 
    static constexpr unsigned RATE_BITS = 1088;
 
    static constexpr unsigned RATE_BUFFERS = RATE_BITS / (8 * sizeof(m_buffer));
 
    static_assert(RATE_BITS % (8 * sizeof(m_buffer)) == 0,
                  "Rate must be a multiple of 8 bytes");
 
public:
    static constexpr size_t OUTPUT_SIZE = 32;
 
    SHA3_256() {}
    SHA3_256 &Write(Span<const uint8_t> data);
    SHA3_256 &Finalize(Span<uint8_t> output);
    SHA3_256 &Reset();
};
 
#endif // BITCOIN_CRYPTO_SHA3_H