sha256.h

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// Copyright (c) 2014-present 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>
 
class CSHA256
{
private:
    uint32_t s[8];
    unsigned char buf[64];
    uint64_t bytes{0};
 
public:
    static const size_t OUTPUT_SIZE = 32;
 
    CSHA256();
    CSHA256& Write(const unsigned char* data, size_t len);
    void Finalize(unsigned char hash[OUTPUT_SIZE]);
    CSHA256& Reset();
};
 
namespace sha256_implementation {
enum UseImplementation : uint8_t {
    STANDARD = 0,
    USE_SSE4 = 1 << 0,
    USE_AVX2 = 1 << 1,
    USE_SHANI = 1 << 2,
    USE_SSE4_AND_AVX2 = USE_SSE4 | USE_AVX2,
    USE_SSE4_AND_SHANI = USE_SSE4 | USE_SHANI,
    USE_ALL = USE_SSE4 | USE_AVX2 | USE_SHANI,
};
}
 
std::string SHA256AutoDetect(sha256_implementation::UseImplementation use_implementation = sha256_implementation::USE_ALL);
 
void SHA256D64(unsigned char* output, const unsigned char* input, size_t blocks);
 
#endif // BITCOIN_CRYPTO_SHA256_H