A keyed SHA-512 interface

1// Copyright (c) 2014-present 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_HMAC_SHA512_H
6#define BITCOIN_CRYPTO_HMAC_SHA512_H
7
8#include <crypto/sha512.h>
9
10#include <cstddef>
11
12/** A hasher class for HMAC-SHA-512. */
13class CHMAC_SHA512
14{
15private:
16    CSHA512 outer;
17    CSHA512 inner;
18
19public:
20    static constexpr size_t OUTPUT_SIZE{64};
21
22    CHMAC_SHA512(const unsigned char* key, size_t keylen);
23    CHMAC_SHA512& Write(const unsigned char* data, size_t len)
24    {
25        inner.Write(data, len);
26        return *this;
27    }
28    void Finalize(unsigned char hash[OUTPUT_SIZE]);
29};
30
31#endif // BITCOIN_CRYPTO_HMAC_SHA512_H
32