Add a Detached Signature (Separate Key, Header Control)

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Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Dim success As Boolean = False

Dim mime As New Chilkat.Mime
success = mime.SetBodyFromPlainText("This message will be signed.")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If

'  Load the certificate and its private key separately.
Dim cert As New Chilkat.Cert
success = cert.LoadFromFile("qa_data/signer.cer")
If (success = False) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


'  Create a detached signature with separately supplied cert and private key, where the 3rd
'  argument controls whether the existing message header fields are transferred to the new outer
'  multipart/signed entity.
Dim transferHeaderFields As Boolean = True
success = mime.AddDetachedSignaturePk2(cert,privKey,transferHeaderFields)
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


success = mime.SaveMime("qa_output/signed.eml")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("Detached signature added (headers transferred).")