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// Crypto/Rar5Aes.h
#ifndef __CRYPTO_RAR5_AES_H
#define __CRYPTO_RAR5_AES_H
#include "../../../C/Aes.h"
#include "../../Common/MyBuffer.h"
#include "HmacSha256.h"
#include "MyAes.h"
namespace NCrypto {
namespace NRar5 {
const unsigned kSaltSize = 16;
const unsigned kPswCheckSize = 8;
const unsigned kAesKeySize = 32;
namespace NCryptoFlags
{
const unsigned kPswCheck = 1 << 0;
const unsigned kUseMAC = 1 << 1;
}
struct CKey
{
bool _needCalc;
unsigned _numIterationsLog;
Byte _salt[kSaltSize];
CByteBuffer _password;
Byte _key[kAesKeySize];
Byte _check_Calced[kPswCheckSize];
Byte _hashKey[SHA256_DIGEST_SIZE];
void CopyCalcedKeysFrom(const CKey &k)
{
memcpy(_key, k._key, sizeof(_key));
memcpy(_check_Calced, k._check_Calced, sizeof(_check_Calced));
memcpy(_hashKey, k._hashKey, sizeof(_hashKey));
}
bool IsKeyEqualTo(const CKey &key)
{
return (_numIterationsLog == key._numIterationsLog
&& memcmp(_salt, key._salt, sizeof(_salt)) == 0
&& _password == key._password);
}
CKey();
};
class CDecoder:
public CAesCbcDecoder,
public CKey
{
Byte _check[kPswCheckSize];
bool _canCheck;
UInt64 Flags;
bool IsThereCheck() const { return ((Flags & NCryptoFlags::kPswCheck) != 0); }
public:
Byte _iv[AES_BLOCK_SIZE];
CDecoder();
STDMETHOD(Init)();
void SetPassword(const Byte *data, size_t size);
HRESULT SetDecoderProps(const Byte *data, unsigned size, bool includeIV, bool isService);
bool CalcKey_and_CheckPassword();
bool UseMAC() const { return (Flags & NCryptoFlags::kUseMAC) != 0; }
UInt32 Hmac_Convert_Crc32(UInt32 crc) const;
void Hmac_Convert_32Bytes(Byte *data) const;
};
}}
#endif
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