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// 7zAes.h
#ifndef __CRYPTO_7Z_AES_H
#define __CRYPTO_7Z_AES_H
#include "../../Common/MyBuffer.h"
#include "../../Common/MyCom.h"
#include "../../Common/MyVector.h"
#include "../ICoder.h"
#include "../IPassword.h"
namespace NCrypto {
namespace N7z {
const unsigned kKeySize = 32;
const unsigned kSaltSizeMax = 16;
const unsigned kIvSizeMax = 16; // AES_BLOCK_SIZE;
class CKeyInfo
{
public:
unsigned NumCyclesPower;
unsigned SaltSize;
Byte Salt[kSaltSizeMax];
CByteBuffer Password;
Byte Key[kKeySize];
bool IsEqualTo(const CKeyInfo &a) const;
void CalcKey();
CKeyInfo() { ClearProps(); }
void ClearProps()
{
NumCyclesPower = 0;
SaltSize = 0;
for (unsigned i = 0; i < sizeof(Salt); i++)
Salt[i] = 0;
}
};
class CKeyInfoCache
{
unsigned Size;
CObjectVector<CKeyInfo> Keys;
public:
CKeyInfoCache(unsigned size): Size(size) {}
bool GetKey(CKeyInfo &key);
void Add(const CKeyInfo &key);
void FindAndAdd(const CKeyInfo &key);
};
class CBase
{
CKeyInfoCache _cachedKeys;
protected:
CKeyInfo _key;
Byte _iv[kIvSizeMax];
unsigned _ivSize;
void PrepareKey();
CBase();
};
class CBaseCoder:
public ICompressFilter,
public ICryptoSetPassword,
public CMyUnknownImp,
public CBase
{
protected:
CMyComPtr<ICompressFilter> _aesFilter;
public:
INTERFACE_ICompressFilter(;)
STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
};
#ifndef EXTRACT_ONLY
class CEncoder:
public CBaseCoder,
public ICompressWriteCoderProperties,
// public ICryptoResetSalt,
public ICryptoResetInitVector
{
public:
MY_UNKNOWN_IMP4(
ICompressFilter,
ICryptoSetPassword,
ICompressWriteCoderProperties,
// ICryptoResetSalt,
ICryptoResetInitVector)
STDMETHOD(WriteCoderProperties)(ISequentialOutStream *outStream);
// STDMETHOD(ResetSalt)();
STDMETHOD(ResetInitVector)();
CEncoder();
};
#endif
class CDecoder:
public CBaseCoder,
public ICompressSetDecoderProperties2
{
public:
MY_UNKNOWN_IMP3(
ICompressFilter,
ICryptoSetPassword,
ICompressSetDecoderProperties2)
STDMETHOD(SetDecoderProperties2)(const Byte *data, UInt32 size);
CDecoder();
};
}}
#endif
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