I have to upload files, and a nice thing to do is run a checksum at the client
and server and verify that the checksums match.
When I upload a file, I also upload another parameter with the computed SHA256
checksum. As the server processes the upload, it generates a SHA256 checksum,
too, and compares it to the uploaded parameter.
Also, make sure your server and the value from NSBasic are in the same case
(lowercase or uppercase), as that could lead to an erroneous failure.
It is pretty easy to run a SHA256 checksum on a server, but here is how to do
it in NSBasic/CE:
AddObject "newObjects.utilctls.SFMain", "file"
AddObject "newObjects.crypt.HashObject", "hash"
Function sha256Checksum(checksum_filename)
Dim result, handle
result = ""
If file.FileExists(checksum_filename) Then
Set handle = file.OpenFile(checksum_filename,&H40)
hash.InitHash "SHA256"
hash.HashData handle.ReadBin(handle.Size)
handle.Close
result = hash.Value
hash.ResetKey
End If
sha256Checksum = result
End Function
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