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src/crypto/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> | |||||
//! The Keccak-f[1600] transform. | |||||
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; | |||||
//! Sponge rate in bits. | |||||
static constexpr unsigned RATE_BITS = 1088; | |||||
//! Sponge rate expressed as a multiple of the buffer size. | |||||
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 |