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-BEGIN VERIFY SCRIPT- ./contrib/devtools/copyright_header.py update ./ -END VERIFY SCRIPT- Commits of previous years: - 2021:f47dda2c58- 2020:fa0074e2d8- 2019:aaaaad6ac9
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// Copyright (c) 2020-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_CRYPTO_SHA3_H
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#define BITCOIN_CRYPTO_SHA3_H
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#include <span.h>
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#include <cstdlib>
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#include <stdint.h>
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//! The Keccak-f[1600] transform.
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void KeccakF(uint64_t (&st)[25]);
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class SHA3_256
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{
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private:
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uint64_t m_state[25] = {0};
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unsigned char m_buffer[8];
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unsigned m_bufsize = 0;
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unsigned m_pos = 0;
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//! Sponge rate in bits.
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static constexpr unsigned RATE_BITS = 1088;
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//! Sponge rate expressed as a multiple of the buffer size.
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static constexpr unsigned RATE_BUFFERS = RATE_BITS / (8 * sizeof(m_buffer));
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static_assert(RATE_BITS % (8 * sizeof(m_buffer)) == 0, "Rate must be a multiple of 8 bytes");
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public:
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static constexpr size_t OUTPUT_SIZE = 32;
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SHA3_256() {}
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SHA3_256& Write(Span<const unsigned char> data);
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SHA3_256& Finalize(Span<unsigned char> output);
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SHA3_256& Reset();
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};
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#endif // BITCOIN_CRYPTO_SHA3_H
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