Initialer Commit

CPP/7zip/Crypto/Rar20Crypto.h

@@ -0,0 +1,48 @@
+// Crypto/Rar20Crypto.h
+
+#ifndef __CRYPTO_RAR20_CRYPTO_H
+#define __CRYPTO_RAR20_CRYPTO_H
+
+#include "../../Common/MyCom.h"
+
+#include "../ICoder.h"
+
+namespace NCrypto {
+namespace NRar2 {
+
+/* ICompressFilter::Init() does nothing for this filter.
+   Call SetPassword() to initialize filter. */
+
+class CData
+{
+  Byte SubstTable[256];
+  UInt32 Keys[4];
+  
+  UInt32 SubstLong(UInt32 t) const
+  {
+    return (UInt32)SubstTable[(unsigned)t & 255]
+        | ((UInt32)SubstTable[(unsigned)(t >> 8) & 255] << 8)
+        | ((UInt32)SubstTable[(unsigned)(t >> 16) & 255] << 16)
+        | ((UInt32)SubstTable[(unsigned)(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, unsigned passwordLen);
+};
+
+class CDecoder:
+  public ICompressFilter,
+  public CMyUnknownImp,
+  public CData
+{
+public:
+  MY_UNKNOWN_IMP
+  INTERFACE_ICompressFilter(;)
+};
+
+}}
+
+#endif