adler32.h

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/*
* Adler32
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_ADLER32_H_
#define BOTAN_ADLER32_H_
 
#include <botan/hash.h>
 
namespace Botan {
 
/**
* The Adler32 checksum, used in zlib
*/
class Adler32 final : public HashFunction {
   public:
      std::string name() const override { return "Adler32"; }
 
      size_t output_length() const override { return 4; }
 
      std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<Adler32>(); }
 
      std::unique_ptr<HashFunction> copy_state() const override;
 
      void clear() override {
         m_S1 = 1;
         m_S2 = 0;
      }
 
      Adler32() { clear(); }
 
      ~Adler32() override { clear(); }
 
   private:
      void add_data(std::span<const uint8_t>) override;
      void final_result(std::span<uint8_t>) override;
      uint16_t m_S1, m_S2;
};
 
}  // namespace Botan
 
#endif