| name | The name of the signature generator. | Yes | 
    | secring | The location of the secret keyring. | No, defaults to ${user.home}/.gnupg/secring.gpg | 
    | keyId | The identifier of the key to use. The keyword 'auto' can be used to indicate a key will be selected automatically. | No, defaults to 'auto'. | 
    | password | The password of the private key. | Yes |