public static string GetAPKSignature()
{
    string str = string.Empty;
    if (Root.Instance.buildSettings.buildUser.Contains("LocalPC"))
    {
        return "dprthtmeoqkr";
    }
    string str2 = "jar:file://";
    string dataPath = Application.dataPath;
    string str4 = "!/";
    string str6 = str2 + dataPath + str4;
    FileStream stream = new FileStream(dataPath, FileMode.Open, FileAccess.Read);
    try
    {
        int num2;
        int length = (int) stream.Length;
        byte[] array = new byte[length];
        for (int i = 0; (num2 = stream.Read(array, i, length - i)) > 0; i += num2)
        {
        }
        byte[] buffer2 = new MD5CryptoServiceProvider().ComputeHash(array);
        StringBuilder builder = new StringBuilder();
        for (int j = 0; j < buffer2.Length; j++)
        {
            builder.Append(buffer2[j].ToString("x2"));
        }
        str = builder.ToString();
    }
    finally
    {
        stream.Close();
    }
    return str;
}