rar20crypto.h

压缩软件源码

// Crypto/Rar20/Crypto.h

#ifndef __CRYPTO_RAR20_CRYPTO_H
#define __CRYPTO_RAR20_CRYPTO_H

#include "../../../Common/Types.h"

namespace NCrypto {
namespace NRar20 {

class CData
{
  Byte SubstTable[256];
  UInt32 Keys[4];
  UInt32 SubstLong(UInt32 t)
  {
    return (UInt32)SubstTable[(int)t & 255] | 
           ((UInt32)SubstTable[(int)(t >> 8) & 255] << 8) |
           ((UInt32)SubstTable[(int)(t >> 16) & 255] << 16) | 
           ((UInt32)SubstTable[(int)(t >> 24) & 255] << 24);
  }

  void UpdateKeys(const Byte *data);
  void CryptBlock(Byte *buf, bool encrypt);
public:
  void EncryptBlock(Byte *buf) { CryptBlock(buf, true); }
  void DecryptBlock(Byte *buf) { CryptBlock(buf, false); }
  void SetPassword(const Byte *password, UInt32 passwordLength);
};

}}

#endif