Bitcoin Core  0.20.99
P2P Digital Currency
sha3.h
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1 // Copyright (c) 2020 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #ifndef BITCOIN_CRYPTO_SHA3_H
6 #define BITCOIN_CRYPTO_SHA3_H
7 
8 #include <span.h>
9 
10 #include <stdint.h>
11 #include <stdlib.h>
12 
14 void KeccakF(uint64_t (&st)[25]);
15 
16 class SHA3_256
17 {
18 private:
19  uint64_t m_state[25] = {0};
20  unsigned char m_buffer[8];
21  unsigned m_bufsize = 0;
22  unsigned m_pos = 0;
23 
25  static constexpr unsigned RATE_BITS = 1088;
26 
28  static constexpr unsigned RATE_BUFFERS = RATE_BITS / (8 * sizeof(m_buffer));
29 
30  static_assert(RATE_BITS % (8 * sizeof(m_buffer)) == 0, "Rate must be a multiple of 8 bytes");
31 
32 public:
33  static constexpr size_t OUTPUT_SIZE = 32;
34 
35  SHA3_256() {}
38  SHA3_256& Reset();
39 };
40 
41 #endif // BITCOIN_CRYPTO_SHA3_H
SHA3_256()
Definition: sha3.h:35
SHA3_256 & Write(Span< const unsigned char > data)
Definition: sha3.cpp:111
Definition: sha3.h:16
static constexpr size_t OUTPUT_SIZE
Definition: sha3.h:33
static constexpr unsigned RATE_BITS
Sponge rate in bits.
Definition: sha3.h:25
SHA3_256 & Finalize(Span< unsigned char > output)
Definition: sha3.cpp:141
uint64_t m_state[25]
Definition: sha3.h:19
void KeccakF(uint64_t(&st)[25])
The Keccak-f[1600] transform.
Definition: sha3.cpp:23
unsigned char m_buffer[8]
Definition: sha3.h:20
unsigned m_bufsize
Definition: sha3.h:21
SHA3_256 & Reset()
Definition: sha3.cpp:155
A Span is an object that can refer to a contiguous sequence of objects.
Definition: span.h:82
unsigned m_pos
Definition: sha3.h:22
static constexpr unsigned RATE_BUFFERS
Sponge rate expressed as a multiple of the buffer size.
Definition: sha3.h:28