37 lines
968 B
C++
37 lines
968 B
C++
// 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
|