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// Crypto/Rar20Crypto.h
#ifndef __CRYPTO_RAR20_CRYPTO_H
#define __CRYPTO_RAR20_CRYPTO_H
#include "../../Common/MyCom.h"
#include "../ICoder.h"
#include "../IPassword.h"
namespace NCrypto {
namespace NRar20 {
/* ICompressFilter::Init() does nothing for this filter.
Call CryptoSetPassword() to initialize filter. */
class CData
{
Byte SubstTable[256];
UInt32 Keys[4];
UInt32 SubstLong(UInt32 t) const
{
return (UInt32)SubstTable[(unsigned)t & 255]
| ((UInt32)SubstTable[(unsigned)(t >> 8) & 255] << 8)
| ((UInt32)SubstTable[(unsigned)(t >> 16) & 255] << 16)
| ((UInt32)SubstTable[(unsigned)(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 passwordLen);
};
class CDecoder:
public ICompressFilter,
public ICryptoSetPassword,
public CMyUnknownImp,
public CData
{
CData _cipher;
public:
MY_UNKNOWN_IMP1(ICryptoSetPassword)
STDMETHOD(Init)();
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
};
}}
#endif
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