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// Crypto/ZipStrong.h
#ifndef __CRYPTO_ZIP_STRONG_H
#define __CRYPTO_ZIP_STRONG_H
#include "../../Common/MyBuffer2.h"
#include "../IPassword.h"
#include "MyAes.h"
namespace NCrypto {
namespace NZipStrong {
/* ICompressFilter::Init() does nothing for this filter.
Call to init:
Decoder:
[CryptoSetPassword();]
ReadHeader();
[CryptoSetPassword();] Init_and_CheckPassword();
[CryptoSetPassword();] Init_and_CheckPassword();
*/
struct CKeyInfo
{
Byte MasterKey[32];
UInt32 KeySize;
void SetPassword(const Byte *data, UInt32 size);
};
class CBaseCoder:
public CAesCbcDecoder,
public ICryptoSetPassword
{
protected:
CKeyInfo _key;
CAlignedBuffer _bufAligned;
public:
STDMETHOD(Init)();
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
};
const unsigned kAesPadAllign = AES_BLOCK_SIZE;
class CDecoder: public CBaseCoder
{
UInt32 _ivSize;
Byte _iv[16];
UInt32 _remSize;
public:
MY_UNKNOWN_IMP1(ICryptoSetPassword)
HRESULT ReadHeader(ISequentialInStream *inStream, UInt32 crc, UInt64 unpackSize);
HRESULT Init_and_CheckPassword(bool &passwOK);
UInt32 GetPadSize(UInt32 packSize32) const
{
// Padding is to align to blockSize of cipher.
// Change it, if is not AES
return kAesPadAllign - (packSize32 & (kAesPadAllign - 1));
}
};
}}
#endif
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