SignFile Method
Signs a file.
Syntax
public void signFile(String sourceFile, String destFile, boolean detached);
Remarks
Use this method to sign a file and store the signed message in another file.
Use SigningKeys to provide the signing keys.
Please note that you might need to provide a passphrase to decrypt your signing key. This can be done via KeyPassphraseNeeded event, or by assigning the passphrase to the key object's Passphrase property.