Create Detached Signature using PFX

Download: Chilkat .NET Assemblies

Creates and verifies a detached signature.

Dim crypt As New Chilkat.Crypt2()

'  Any string argument automatically begins the 30-day trial.
Dim success As Boolean
success = crypt.UnlockComponent("30-day trial")
If (success <> true) Then
    MsgBox("Crypt component unlock failed")
    Exit Sub
End If


'  Create an instance of a certificate store object, load a PFX file,
'  locate the certificate we need, and use it for signing.
'  (a PFX file may contain more than one certificate.)
Dim certStore As New Chilkat.CertStore()
'  The 1st argument is the filename, the 2nd arg is the
'  PFX file's password:
success = certStore.LoadPfxFile("chilkat.pfx","test")
If (success <> true) Then
    MsgBox(certStore.LastErrorText)
    Exit Sub
End If


Dim cert As Chilkat.Cert
cert = certStore.FindCertBySubject("Chilkat Software, Inc.")
If (cert Is Nothing ) Then
    MsgBox(certStore.LastErrorText)
    Exit Sub
End If


'  Tell the crypt component to use this cert.
crypt.SetSigningCert(cert)

'  We can sign any type of file, creating a .sig as output:
success = crypt.CreateDetachedSignature("test.pdf","test.sig")
If (success = true) Then
    MsgBox("Success!")
End If

MsgBox(crypt.LastErrorText)

'  Verify and restore the original file:
crypt.SetVerifyCert(cert)

success = crypt.VerifyDetachedSignature("test.pdf","test.sig")
If (success = true) Then
    MsgBox("Success!")
End If

MsgBox(crypt.LastErrorText)