Behaviour describing the API for public key handling of an SSH server. By implementing
the callbacks defined in this behavior, the public key handling of an SSH server can
be customized. By default the SSH application implements this behavior
with help of the standard OpenSSH files,
see the
Type definitions that are used more than once in this module,
or abstractions to indicate the intended use of the data
type, or both. For more details on public key data types,
refer to Section 2 Public Key Records in the
Fetches the private key of the host.
Checks if the user key is authorized.