MD5-Hash for an entire folder

General
1

Hi everybody,

I want to check the integrity of all files in a directory.

I want to know if anyone knows how to perform a MD5-Hash for an entire folder, I confess I don’t really understand how to do it…

Thanks for your help.

2

You would need to open each file individually and read the contents in order to compute the hash. You could compute an individual hash value for each file, or a cumulative hash value for the entire contents of the folder.

e.g. this computes a cumulative hash for a list of files using the MD5Digest class:

Function HashFiles(FileList() As FolderItem) As String
  Dim hasher As New MD5Digest
  For i As Integer = 0 To Ubound(FileList)
    Dim bs As BinaryStream = BinaryStream.Open(FileList(i))
    Dim raw As String =  bs.Read(bs.Length)
    bs.Close
    hasher.Process(raw)
  Next
  Return EncodeHex(hasher.Value)
End Function

Doing a single file individually would be the same, just without the loop.

3

Hi Andrew,

Your method works perfectly !

Thank you very much for your help.