sha256.h
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sha256.h
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	// Copyright (c) 2014-2016 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_SHA256_H
	#define BITCOIN_CRYPTO_SHA256_H

	#include <cstdint>
	#include <cstdlib>
	#include <string>

	/** A hasher class for SHA-256. */
	class CSHA256 {
	private:
	uint32_t s[8];
	uint8_t buf[64];
	uint64_t bytes;

	public:
	static const size_t OUTPUT_SIZE = 32;

	CSHA256();
	CSHA256 &Write(const uint8_t *data, size_t len);
	void Finalize(uint8_t hash[OUTPUT_SIZE]);
	CSHA256 &Reset();
	};

	/**
	* Autodetect the best available SHA256 implementation.
	* Returns the name of the implementation.
	*/
	std::string SHA256AutoDetect();

	#endif // BITCOIN_CRYPTO_SHA256_H