[RESOLVED] CAPICOM Hash returning different values

[Arachnid13]

Hi all,

I have a function which is in both a DLL on my website and in an EXE locally, the function gets the hash of a file, requests a hash of a file from the website (using the dll) and if they are different updates the website file. However even when I know the file is an exact copy the hashes are both different!!!

Here's my function: (it requires CAPICOM v2.0)

Private Function HashFile(filename As String) As String
    Const lngChunkSize = 100000
    Dim theHash As CAPICOM.HashedData
    Dim lngFreeFile As Long
    Dim strChunk As String
    
    Set theHash = New CAPICOM.HashedData
    
    theHash.Algorithm = CAPICOM_HASH_ALGORITHM_MD5
    
    lngFreeFile = FreeFile
    
    Open filename For Binary Access Read As lngFreeFile
    Do
        If lngChunkSize > LOF(lngFreeFile) - Loc(lngFreeFile) Then
            strChunk = Space$(LOF(lngFreeFile) - Loc(lngFreeFile))
        Else
            strChunk = Space$(lngChunkSize)
        End If
        Get lngFreeFile, , strChunk
        theHash.Hash strChunk
    Loop Until Loc(lngFreeFile) = LOF(lngFreeFile)
    Close lngFreeFile
    
    HashFile = theHash.Value
    
    Set theHash = Nothing
End Function

[Arachnid13]

http://www.mcse.ms/message1672489.html

I've just found this article which seems to describe the problem perfectly and puts it down to string encoding, is there something I could do using StrConv?

[Arachnid13]

Doesnt matter, turns out I was calculating the filename incorrectly before calling the function.