C# Single Sign-On

namespace BookingBug {
  public class TokenGenerator {
    public static string create(JsonObject data) { 
      string CompanyId = "{Your Company ID or Affiliate ID}";
      string SecureKey = "{Your Secure Key}";        
      string initVector = "OpenSSL for Ruby"; // DO NOT CHANGE

      string expires = DateTime.UtcNow.AddHours(1).ToString("yyyy-MM-ddTHH:mm:ssZ");
      data["expires"] = expires;

      byte[] initVectorBytes = Encoding.UTF8.GetBytes(initVector);
      byte[] keyBytesLong;
      using( SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider() ) {
        keyBytesLong = sha.ComputeHash( Encoding.UTF8.GetBytes( SecureKey + CompanyId ) );
      }
      byte[] keyBytes = new byte[16];
      Array.Copy(keyBytesLong, keyBytes, 16);

      byte[] textBytes = Encoding.UTF8.GetBytes(data.ToString());
      for (int i = 0; i < 16; i++) {
        textBytes[i] ^= initVectorBytes[i];
      }

      // Encrypt the string to an array of bytes
      byte[] encrypted = encryptStringToBytes_AES(textBytes, keyBytes, initVectorBytes);
      string encoded = Convert.ToBase64String(encrypted);	
      return HttpUtility.UrlEncode(encoded);
    }

    static byte[] encryptStringToBytes_AES(byte[] textBytes, byte[] Key, byte[] IV) {
      // Declare the stream used to encrypt to an in memory
      // array of bytes and the RijndaelManaged object
      // used to encrypt the data.
      using( MemoryStream msEncrypt = new MemoryStream() )
      using( RijndaelManaged aesAlg = new RijndaelManaged() )
      {
        // Provide the RijndaelManaged object with the specified key and IV.
        aesAlg.Mode = CipherMode.CBC;
        aesAlg.Padding = PaddingMode.PKCS7;
        aesAlg.KeySize = 128;
        aesAlg.BlockSize = 128;
        aesAlg.Key = Key;
        aesAlg.IV = IV;
        // Create an encrytor to perform the stream transform.
        ICryptoTransform encryptor = aesAlg.CreateEncryptor();

        // Create the streams used for encryption.
        using( CryptoStream csEncrypt = new CryptoStream( msEncrypt, encryptor, CryptoStreamMode.Write ) ) {
          csEncrypt.Write( textBytes, 0, textBytes.Length );
          csEncrypt.FlushFinalBlock();
        }

        byte[] encrypted = msEncrypt.ToArray(); 
        // Return the encrypted bytes from the memory stream.
        return encrypted;
      }
    }   
  }
}

class MainClass
{
    static void Main(string[] args)
    {
        JsonObject jsonObject = new JsonObject();
        jsonObject["first_name"] = "John";
        jsonObject["last_name"] = "Smith";
        jsonObject["email"] = "smith@example.com";
        jsonObject["mobile"] = "0123456789";
        System.Console.WriteLine(BookingBug.TokenGenerator.create(jsonObject));
    }
}

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