49 lines
1.0 KiB
C++
49 lines
1.0 KiB
C++
// Crypto/Rar20Crypto.h
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#ifndef __CRYPTO_RAR20_CRYPTO_H
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#define __CRYPTO_RAR20_CRYPTO_H
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#include "../../Common/MyCom.h"
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#include "../ICoder.h"
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namespace NCrypto {
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namespace NRar2 {
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/* ICompressFilter::Init() does nothing for this filter.
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Call SetPassword() to initialize filter. */
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class CData
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{
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Byte SubstTable[256];
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UInt32 Keys[4];
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UInt32 SubstLong(UInt32 t) const
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{
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return (UInt32)SubstTable[(unsigned)t & 255]
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| ((UInt32)SubstTable[(unsigned)(t >> 8) & 255] << 8)
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| ((UInt32)SubstTable[(unsigned)(t >> 16) & 255] << 16)
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| ((UInt32)SubstTable[(unsigned)(t >> 24) & 255] << 24);
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}
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void UpdateKeys(const Byte *data);
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void CryptBlock(Byte *buf, bool encrypt);
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public:
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void EncryptBlock(Byte *buf) { CryptBlock(buf, true); }
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void DecryptBlock(Byte *buf) { CryptBlock(buf, false); }
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void SetPassword(const Byte *password, unsigned passwordLen);
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};
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class CDecoder:
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public ICompressFilter,
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public CMyUnknownImp,
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public CData
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{
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public:
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MY_UNKNOWN_IMP
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INTERFACE_ICompressFilter(;)
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};
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}}
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#endif
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