Android - Convertir a codigo JAVA para android

//PRINCIPIO

Public Function Desencripta(Cadena As String) As String

    Dim inputBytes As Byte() = Convert.FromBase64String(Cadena)

    Dim resultBytes As Byte() = New Byte(inputBytes.Length - 1) {}

    Dim textoLimpio As String = [String].Empty

    Dim cripto As New RijndaelManaged()

    Using ms As New MemoryStream(inputBytes)

        Using objCryptoStream As New CryptoStream(ms, cripto.CreateDecryptor(Clave, IV), CryptoStreamMode.Read)

            Using sr As New StreamReader(objCryptoStream, True)

                textoLimpio = sr.ReadToEnd()

            End Using

        End Using

    End Using

    Return textoLimpio

End Function

//FINAL