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// Crypto/ZipCrypto.h
#ifndef __CRYPTO_ZIP_CRYPTO_H
#define __CRYPTO_ZIP_CRYPTO_H
#include "Common/MyCom.h"
#include "../ICoder.h"
#include "../IPassword.h"
namespace NCrypto {
namespace NZip {
const unsigned kHeaderSize = 12;
class CCipher
{
UInt32 Keys[3];
void UpdateKeys(Byte b);
Byte DecryptByteSpec();
public:
void SetPassword(const Byte *password, UInt32 passwordLen);
Byte DecryptByte(Byte b);
Byte EncryptByte(Byte b);
void DecryptHeader(Byte *buf);
void EncryptHeader(Byte *buf);
};
class CEncoder :
public ICompressFilter,
public ICryptoSetPassword,
public ICryptoSetCRC,
public CMyUnknownImp
{
CCipher _cipher;
UInt32 _crc;
public:
MY_UNKNOWN_IMP2(
ICryptoSetPassword,
ICryptoSetCRC
)
STDMETHOD(Init)();
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
STDMETHOD(CryptoSetCRC)(UInt32 crc);
HRESULT WriteHeader(ISequentialOutStream *outStream);
};
class CDecoder:
public ICompressFilter,
public ICryptoSetPassword,
public CMyUnknownImp
{
CCipher _cipher;
public:
MY_UNKNOWN_IMP1(ICryptoSetPassword)
STDMETHOD(Init)();
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
HRESULT ReadHeader(ISequentialInStream *inStream);
};
}}
#endif
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