sha224_256.hpp

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/*
 * libxcks
 * Copyright (C) 2022 Julien Couot
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef INC_SHA224_256_HPP_178C3693_9F7E_475C_A474_9DBDA16BCC5B
#define INC_SHA224_256_HPP_178C3693_9F7E_475C_A474_9DBDA16BCC5B
 
//---------------------------------------------------------------------------
#include "libgcrypthash.hpp"
//---------------------------------------------------------------------------
 
 
namespace libxcks
{
class AbstractSHA256Impl : public LibgcryptHash
{
 protected:
  // State of computation between the single steps.
  uint32_t h0;  
  uint32_t h1;  
  uint32_t h2;  
  uint32_t h3;  
  uint32_t h4;  
  uint32_t h5;  
  uint32_t h6;  
  uint32_t h7;  
 
  uint32_t nblocks;     
  int      count;       
  uint8_t   ibuffer[64]; 
 
 public:
  void reset() override = 0;
 
  void update(const uint8_t* buf, size_t len) override final;
 
 protected:
  void finish();
 
  void transform(uint8_t* data);
};
//---------------------------------------------------------------------------
 
 
class SHA224 final : public AbstractSHA256Impl
{
 public:
  SHA224();
 
  void reset() override;
 
  uint8_t* getValue(uint8_t* buffer) const override;
 
  size_t getSize() const override { return 28; }
 
  std::string getName() const override
  {
    return getHashName();
  }
 
  ArrayString getAltNames() const override
  {
    return getAlternativeNames();
  }
 
  ChecksumAlgoId getID() const override
  {
    return getIdentifier();
  }
 
  static std::string getHashName()
  {
    return "SHA2-224";
  }
 
  static ArrayString getAlternativeNames();
 
  static constexpr ChecksumAlgoId getIdentifier()
  {
    return ChecksumAlgoId::SHA2_224;
  }
 
  static Checksum* getNewInstance()
  {
    return new SHA224();
  }
};
//---------------------------------------------------------------------------
 
 
class SHA256 final : public AbstractSHA256Impl
{
 public:
  SHA256();
 
  void reset() override;
 
  uint8_t* getValue(uint8_t* buffer) const override;
 
  size_t getSize() const override { return 32; }
 
  std::string getName() const override
  {
    return getHashName();
  }
 
  ArrayString getAltNames() const override
  {
    return getAlternativeNames();
  }
 
  ChecksumAlgoId getID() const override
  {
    return getIdentifier();
  }
 
  static std::string getHashName()
  {
    return "SHA2-256";
  }
 
  static ArrayString getAlternativeNames();
 
  static constexpr ChecksumAlgoId getIdentifier()
  {
    return ChecksumAlgoId::SHA2_256;
  }
 
  static Checksum* getNewInstance()
  {
    return new SHA256();
  }
};
//---------------------------------------------------------------------------
}  // namespace libxcks
//---------------------------------------------------------------------------
 
#endif  // INC_SHA224_256_HPP_178C3693_9F7E_475C_A474_9DBDA16BCC5B