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// Copyright (c) 2014 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_RFC6979_HMAC_SHA256_H
#define BITCOIN_RFC6979_HMAC_SHA256_H
#include "crypto/hmac_sha256.h"
#include <stdint.h>
#include <stdlib.h>
/** The RFC 6979 PRNG using HMAC-SHA256. */
class RFC6979_HMAC_SHA256
{
private:
unsigned char V[CHMAC_SHA256::OUTPUT_SIZE];
unsigned char K[CHMAC_SHA256::OUTPUT_SIZE];
bool retry;
public:
/**
* Construct a new RFC6979 PRNG, using the given key and message.
* The message is assumed to be already hashed.
*/
RFC6979_HMAC_SHA256(const unsigned char* key, size_t keylen, const unsigned char* msg, size_t msglen);
/**
* Generate a byte array.
*/
void Generate(unsigned char* output, size_t outputlen);
~RFC6979_HMAC_SHA256();
};
#endif // BITCOIN_RFC6979_HMAC_SHA256_H
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