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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;
/* ICompressFilter::Init() does nothing for this filter.
Call to init:
Encoder:
CryptoSetPassword();
WriteHeader();
Decoder:
[CryptoSetPassword();]
ReadHeader();
[CryptoSetPassword();] Init_and_GetCrcByte();
[CryptoSetPassword();] Init_and_GetCrcByte();
*/
class CCipher:
public ICompressFilter,
public ICryptoSetPassword,
public CMyUnknownImp
{
protected:
UInt32 Key0;
UInt32 Key1;
UInt32 Key2;
UInt32 KeyMem0;
UInt32 KeyMem1;
UInt32 KeyMem2;
void RestoreKeys()
{
Key0 = KeyMem0;
Key1 = KeyMem1;
Key2 = KeyMem2;
}
public:
MY_UNKNOWN_IMP1(ICryptoSetPassword)
STDMETHOD(Init)();
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
};
class CEncoder: public CCipher
{
public:
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
HRESULT WriteHeader_Check16(ISequentialOutStream *outStream, UInt16 crc);
};
class CDecoder: public CCipher
{
public:
Byte _header[kHeaderSize];
STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
HRESULT ReadHeader(ISequentialInStream *inStream);
void Init_BeforeDecode();
};
}}
#endif
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