SHA1 Encoding in VBScript

WScript.Echo getSHA1("myteststring")

Function getSHA1(instr)
    Dim asc, enc, bytes, outstr, pos

    '.NET 1.1 (and higher) objects
    Set asc = CreateObject("System.Text.UTF8Encoding")
    Set enc = CreateObject("System.Security.Cryptography.SHA1CryptoServiceProvider")

    'Convert the string to a byte array and hash it
    bytes = asc.GetBytes_4(instr)
    bytes = enc.ComputeHash_2((bytes))

    getSHA1 = ""

    'Convert the byte array to a hex string
    For pos = 1 To Lenb(bytes)
        getSHA1 = getSHA1 & LCase(Right("0" & Hex(Ascb(Midb(bytes, pos, 1))), 2))
    Next
End Function