Calculate MD5 Hash of File (or SHA-1, and other hash algorithms)

Demonstrates how to calculate a hash for a file's contents.

Download: Chilkat .NET Assemblies

Dim crypt As New Chilkat.Crypt2()

Dim success As Boolean
success = crypt.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & crypt.LastErrorText & vbCrLf
    Exit Sub
End If


'  Set the name of the hash algorithm.
'  Other choices include "sha1", "sha384", "sha512", "md2", "md5", and "haval".
crypt.HashAlgorithm = "md5"

'  EncodingMode specifies the encoding of the hash output.
'  It may be "hex", "url", "base64", or "quoted-printable".
crypt.EncodingMode = "hex"

'  Files of any type may be hashed -- it doesn't matter
'  if the file is binary or text...
Dim hashStr As String
hashStr = crypt.HashFileENC("/temp/something.dat")
If (hashStr = vbNullString ) Then
    TextBox1.Text = TextBox1.Text & crypt.LastErrorText & vbCrLf
    Exit Sub
End If


TextBox1.Text = TextBox1.Text & hashStr & vbCrLf