src/crypto/sha256.h

   1 // Copyright (c) 2014-2017 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #ifndef BITCOIN_CRYPTO_SHA256_H
   6 #define BITCOIN_CRYPTO_SHA256_H
   7
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #include <string>
  11
  12 /** A hasher class for SHA-256. */
  13 class CSHA256
  14 {
  15 private:
  16     uint32_t s[8];
  17     unsigned char buf[64];
  18     uint64_t bytes;
  19
  20 public:
  21     static const size_t OUTPUT_SIZE = 32;
  22
  23     CSHA256();
  24     CSHA256& Write(const unsigned char* data, size_t len);
  25     void Finalize(unsigned char hash[OUTPUT_SIZE]);
  26     CSHA256& Reset();
  27 };
  28
  29 /** Autodetect the best available SHA256 implementation.
  30  *  Returns the name of the implementation.
  31  */
  32 std::string SHA256AutoDetect();
  33
  34 #endif // BITCOIN_CRYPTO_SHA256_H