4.63

CPP/7zip/Crypto/Rar20Crypto.h

@@ -0,0 +1,50 @@
+// Crypto/Rar20Crypto.h
+
+#ifndef __CRYPTO_RAR20_CRYPTO_H
+#define __CRYPTO_RAR20_CRYPTO_H
+
+#include "Common/MyCom.h"
+
+#include "../ICoder.h"
+#include "../IPassword.h"
+
+namespace NCrypto {
+namespace NRar20 {
+
+class CData
+{
+  Byte SubstTable[256];
+  UInt32 Keys[4];
+  
+  UInt32 SubstLong(UInt32 t)
+  {
+    return (UInt32)SubstTable[(int)t & 255] |
+           ((UInt32)SubstTable[(int)(t >> 8) & 255] << 8) |
+           ((UInt32)SubstTable[(int)(t >> 16) & 255] << 16) |
+           ((UInt32)SubstTable[(int)(t >> 24) & 255] << 24);
+  }
+  void UpdateKeys(const Byte *data);
+  void CryptBlock(Byte *buf, bool encrypt);
+public:
+  void EncryptBlock(Byte *buf) { CryptBlock(buf, true); }
+  void DecryptBlock(Byte *buf) { CryptBlock(buf, false); }
+  void SetPassword(const Byte *password, UInt32 passwordLen);
+};
+
+class CDecoder:
+  public ICompressFilter,
+  public ICryptoSetPassword,
+  public CMyUnknownImp
+{
+  CData _cipher;
+public:
+  MY_UNKNOWN_IMP1(ICryptoSetPassword)
+
+  STDMETHOD(Init)();
+  STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
+  STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
+};
+
+}}
+
+#endif