hmac_sha256.h

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// Copyright (c) 2014-2018 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_HMAC_SHA256_H
#define BITCOIN_CRYPTO_HMAC_SHA256_H
 
#include <crypto/sha256.h>
 
#include <stdint.h>
#include <stdlib.h>
 
class CHMAC_SHA256
{
private:
    CSHA256 outer;
    CSHA256 inner;
 
public:
    static const size_t OUTPUT_SIZE = 32;
 
    CHMAC_SHA256(const unsigned char* key, size_t keylen);
    CHMAC_SHA256& Write(const unsigned char* data, size_t len)
    {
        inner.Write(data, len);
        return *this;
    }
    void Finalize(unsigned char hash[OUTPUT_SIZE]);
};
 
#endif // BITCOIN_CRYPTO_HMAC_SHA256_H