47 lines
1.3 KiB
C++
47 lines
1.3 KiB
C++
// Copyright (c) 2014 The Bitcoin Core developers
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// Copyright (c) 2016-2023 The Zcash developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or https://www.opensource.org/licenses/mit-license.php .
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#ifndef BITCOIN_CRYPTO_SHA256_H
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#define BITCOIN_CRYPTO_SHA256_H
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#include <stdint.h>
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#include <stdlib.h>
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#include <string>
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/** A hasher class for SHA-256. */
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class CSHA256
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{
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public:
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static const size_t OUTPUT_SIZE = 32;
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CSHA256();
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CSHA256& Write(const unsigned char* data, size_t len);
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void Finalize(unsigned char hash[OUTPUT_SIZE]);
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void FinalizeNoPadding(unsigned char hash[OUTPUT_SIZE]) {
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FinalizeNoPadding(hash, true);
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};
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CSHA256& Reset();
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private:
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uint32_t s[8];
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unsigned char buf[64];
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size_t bytes;
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void FinalizeNoPadding(unsigned char hash[OUTPUT_SIZE], bool enforce_compression);
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};
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/** Autodetect the best available SHA256 implementation.
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* Returns the name of the implementation.
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*/
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std::string SHA256AutoDetect();
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/** Compute multiple double-SHA256's of 64-byte blobs.
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* output: pointer to a blocks*32 byte output buffer
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* input: pointer to a blocks*64 byte input buffer
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* blocks: the number of hashes to compute.
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*/
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void SHA256D64(unsigned char* output, const unsigned char* input, size_t blocks);
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#endif // BITCOIN_CRYPTO_SHA256_H
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