//.h file code:

using namespace System;
using namespace System::Text; //Above Public Class

public ref class StairsEncryption
{
public:
    static String ^Crypt(String ^Data, String ^key);
    static array<Byte> ^Crypt(array<Byte> ^Data, array<Byte> ^key);
    static String ^DeCrypt(String ^Data, String ^key);
    static array<Byte> ^DeCrypt(array<Byte> ^Data, array<Byte> ^key);
};

//.cpp file code:

using namespace System;
using namespace System::Text;

String ^StairsEncryption::Crypt(String ^Data, String ^key)
{
  return Encoding::Default->GetString(Crypt(Encoding::Default->GetBytes(Data), Encoding::Default->GetBytes(key)));
}

array<Byte> ^StairsEncryption::Crypt(array<Byte> ^Data, array<Byte> ^key)
{
  for (Object ^i = 0; i <= (Data->Length * 2) + key->Length; i++)
  {
Data[i % Data->Length] = Convert::ToByte(Convert::ToInt32((Data[i % Data->Length]) + Convert::ToInt32(Data[(i + 1) % Data->Length])) % 256) ^ key[i % key->Length];
  }
  return Data;
}

String ^StairsEncryption::DeCrypt(String ^Data, String ^key)
{
  return Encoding::Default->GetString(DeCrypt(Encoding::Default->GetBytes(Data), Encoding::Default->GetBytes(key)));
}

array<Byte> ^StairsEncryption::DeCrypt(array<Byte> ^Data, array<Byte> ^key)
{
  for (Object ^i = (Data->Length * 2) + key->Length; i >= 0; i--)
  {
Data[i % Data->Length] = Convert::ToByte((Convert::ToInt32(Data[i % Data->Length] ^ key[i % key->Length]) - Convert::ToInt32(Data[(i + 1) % Data->Length]) + 256) % 256);
  }
  return Data;
}