Convert a hex string to base64 in an Excel function

Question

I have a lengthy string of hex values to convert to base64.

I'm looking for a simple format cell function such as =Hex2b64(Hexstring) that will accept any length of hex characters.

I have been using http://home.paulschou.net/tools/xlate/ to do my conversion manually. The conversion works and the data is received by all relevant databases and parsed appropriately.

The data I am receiving is hex represented binary, which has been converted in multiple blocks and concatenated into long hex strings in accordance with project documentation that I am not privy to.

A typical Input String would be:

Hex= 00014088F6650101393939393939392D30304646463238313030000343332353430342D35353FA10000002805900100002805

and the corresponding output would be:

B64 = AAFAiPZlAQE5OTk5OTk5LTAwRkZGMjgxMDAAA0MzI1NDA0LTU1P6EAAAAoBZABAAAoAF

Answer 1

Function Hex2Base64(ByVal sHex)

    Static oNode As Object
    Dim a() As Byte

    If Len(sHex) Mod 2 <> 0 Then
        sHex = Left(sHex, Len(sHex) - 1) & "0" & Right(sHex, 1)
    End If
    If oNode Is Nothing Then
        Set oNode = CreateObject("MSXML2.DOMDocument").createElement("Node")
    End If
    With oNode
        .text = ""
        .dataType = "bin.hex"
        .text = sHex
        a = .nodeTypedValue
        .dataType = "bin.base64"
        .nodeTypedValue = a
        Hex2Base64 = .text
    End With

End Function