crc24.h

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/*
* CRC24
* (C) 1999-2007 Jack Lloyd
* (C) 2017 [Ribose Inc](https://www.ribose.com). Performed by Krzysztof Kwiatkowski.
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_CRC24_H_
#define BOTAN_CRC24_H_
 
#include <botan/hash.h>
 
namespace Botan {
 
/**
* 24-bit cyclic redundancy check
*
* This is the CRC used for checksums in PGP
*/
class CRC24 final : public HashFunction {
   public:
      std::string name() const override { return "CRC24"; }
 
      size_t output_length() const override { return 3; }
 
      size_t security_level() const override { return 0; }
 
      std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<CRC24>(); }
 
      std::unique_ptr<HashFunction> copy_state() const override;
 
      void clear() override { m_crc = 0xCE04B7; }
 
   private:
      void add_data(std::span<const uint8_t> input) override;
      void final_result(std::span<uint8_t> output) override;
      uint32_t m_crc = 0xCE04B7;
};
 
}  // namespace Botan
 
#endif