Visual Basic 6.0

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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Visual Basic 6.0

Dim success As Long
success = 0

'  Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
'  separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
'  Cert and the 2nd is the PrivateKey.

Dim imap As New ChilkatImap

imap.Ssl = 1
imap.Port = 993

success = imap.Connect("imap.example.com")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

success = imap.Login("user@example.com","myPassword")
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

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

Dim privKey As New PrivateKey
success = privKey.LoadPemFile("qa_data/smime_privkey.pem")
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

'  Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
success = imap.SetDecryptCert2(cert,privKey)
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If

success = imap.Disconnect()
If (success = 0) Then
    Debug.Print imap.LastErrorText
    Exit Sub
End If