1  // Copyright (c) 2014-present 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_SHA1_H
 6  #define BITCOIN_CRYPTO_SHA1_H
 7  
 8  #include <cstdint>
 9  #include <cstdlib>
10  
11  /** A hasher class for SHA1. */
12  class CSHA1
13  {
14  private:
15      uint32_t s[5];
16      unsigned char buf[64];
17      uint64_t bytes{0};
18  
19  public:
20      static const size_t OUTPUT_SIZE = 20;
21  
22      CSHA1();
23      CSHA1& Write(const unsigned char* data, size_t len);
24      void Finalize(unsigned char hash[OUTPUT_SIZE]);
25      CSHA1& Reset();
26  };
27  
28  #endif // BITCOIN_CRYPTO_SHA1_H