Add a Detached Signature (Separate Key, Header Control)

See more MIME Examples

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 Long
success = 0

Dim mime As New ChilkatMime
success = mime.SetBodyFromPlainText("This message will be signed.")
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

'  Load the certificate and its private key separately.
Dim cert As New ChilkatCert
success = cert.LoadFromFile("qa_data/signer.cer")
If (success = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

Dim privKey As New PrivateKey
success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
If (success = 0) Then
    Debug.Print 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 Long
transferHeaderFields = 1
success = mime.AddDetachedSignaturePk2(cert,privKey,transferHeaderFields)
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

success = mime.SaveMime("qa_output/signed.eml")
If (success = 0) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

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