Set the DKIM Signing Private Key

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Demonstrates the Chilkat Dkim.SetDkimPrivateKey method, which supplies the RSA private key used by DkimSign. The only argument is a PrivateKey object. The source key may be destroyed after this returns, and the configured key can be reused for multiple signatures.

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.

Background: DKIM proves a message really came from its domain by signing it with a private key that only the domain owner holds; recipients verify with the matching public key published in the domain's DNS. This method loads that private half into the Dkim object once, so a mail server can sign every outgoing message without re-reading the key each time. Because the key is the domain's signing secret, it should be protected like any other private key and never committed to source.

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bool success = false;

//  Demonstrates the Dkim.SetDkimPrivateKey method, which supplies the RSA private key used by
//  DkimSign.  The only argument is a PrivateKey object.

Chilkat.Dkim dkim = new Chilkat.Dkim();

//  Load the RSA private key that corresponds to the public key published in the domain's DNS.
Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadPemFile("qa_data/dkim_private.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

//  Copy the key into the Dkim object.  The PrivateKey object may be destroyed afterward, and the
//  configured key can be reused for multiple signatures.
success = dkim.SetDkimPrivateKey(privKey);
if (success == false) {
    Debug.WriteLine(dkim.LastErrorText);
    return;
}

Debug.WriteLine("DKIM private key configured.");