最近在学如何设置各用户不同权限，前两天下载了一个《华海仓库管理软件》，其中关于用户权限设置代码如下：

Dim lst As WinForm.CheckedListBox
lst = e.form.Controls("CheckListBox1")
If Vars("用户").split(",")(0) = "rad0" And len(lst.value)<>158 Then
    msgbox("管理员必须拥有所有权限!",64,"提示")
    Return
End If
Dim str1,str2,str3 As String
str1 = e.Form.Controls("TextBox1").value
str2 = e.Form.Controls("TextBox2").value
str3 = e.Form.Controls("TextBox3").value
If str1 Is Nothing Then
    msgbox("用户名不能为空!",64,"提示")
Else If str2 Is Nothing Then
    msgbox("密码不能为空!",64,"提示")
Else If str3 <> str2 Then
    msgbox("两次输入的密码不一致,请重新输入!",64,"提示")
    e.Form.Controls("TextBox2").value = Nothing
    e.Form.Controls("TextBox3").value = Nothing
Else
    str2 = EncryptText(str2,"lgh","1qaz2wsx3edc")
    str3 = EncryptText(lst.Value & "","gdlgh","4rfv5tgb6yhn")
    Dim cmd As New SQLCommand
    cmd.C
    If Vars("用户")<>"" Then
        cmd.CommandText = "UPDATE [权限] SET 名称 = \'" & str1 & "\',密码 = \'" & str2 & "\',权限 = \'" & str3 & "\' WHERE 名称 = \'" & Vars("用户").split(",")(1) & "\'"
        cmd.ExecuteNonQuery()
        Forms("管理").Controls(Vars("用户").split(",")(0)).text = str1
    Else
        cmd.CommandText = "select count(*) from [权限] where 名称 = \'" & str1 & "\'"
        If cmd.ExecuteScalar() > 0 Then
            msgbox("用户名已存在!",64,"提示")
            e.Form.Controls("TextBox1").value = ""
            Return
        End If
        cmd.CommandText = "Insert Into [权限] (名称,密码,权限) values(\'" & str1 & "\',\'" & str2 & "\',\'" & str3 & "\')"
        cmd.ExecuteNonQuery()
        With Forms("管理").Controls("CheckBox1")
            .Checked = not .Checked
        End With
    End If
    Forms("管理").Controls("rad0").Select()
    e.form.close
End If

求教，哪位高手给解读一下，具体作用，我打开数据库，看见的权限一栏是一长串字符，如何知晓这串字符是怎么生成的！

是某一些地方不懂，

str3 = EncryptText(lst.Value & "","gdlgh","4rfv5tgb6yhn")
比如以上这段解读，是起什么作用

我能读懂的是str3 = EncryptText（加密文本）（ist.value,  后面什么意思没看懂