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// Copyright (c) 2014-2022 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 <cstdlib>
#include <stdint.h>
#include <string>
/** A hasher class for SHA-256. */
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,
};
}
/** Autodetect the best available SHA256 implementation.
* Returns the name of the implementation.
*/
std::string SHA256AutoDetect(sha256_implementation::UseImplementation use_implementation = sha256_implementation::USE_ALL);
/** Compute multiple double-SHA256's of 64-byte blobs.
* output: pointer to a blocks*32 byte output buffer
* input: pointer to a blocks*64 byte input buffer
* blocks: the number of hashes to compute.
*/
void SHA256D64(unsigned char* output, const unsigned char* input, size_t blocks);
#endif // BITCOIN_CRYPTO_SHA256_H
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