entication
    |
    |- PasswordAuthFailed - Failure when authenticating by a password
    |  |- PasswordAuthRejected - Tor rejected this method of authentication
    |  |- IncorrectPassword - Password was rejected
    |  +- MissingPassword - Socket supports password auth but wasn't attempted
    |
    |- CookieAuthFailed - Failure when authenticating by a cookie
    |  |- CookieAuthRejected - Tor rejected this method of authentication
    |  |- IncorrectCookieValue - Authentication cookie was rejected
    |  |- IncorrectCookieSize - Size of the cookie file is incorrect
    |  |- UnreadableCookieFile - Unable to read the contents of the auth cookie
    |  +- AuthChallengeFailed - Failure completing the authchallenge request
    |     |- AuthChallengeUnsupported - Tor doesn't recognize the AUTHCHALLENGE command
    |     |- AuthSecurityFailure - Server provided the wrong nonce credentials
    |     |- InvalidClientNonce - The client nonce is invalid
    |     +- UnrecognizedAuthChallengeMethod - AUTHCHALLENGE does not support the given methods.
    |
    +- MissingAuthInfo - Unexpected PROTOCOLINFO response, missing auth info
       |- NoAuthMethods - Missing any methods for authenticating
       +- NoAuthCookie - Supports cookie auth but doesn't have its path

.. data:: AuthMethod (enum)

  Enumeration of PROTOCOLINFO responses for supported authentication methods.

  ============== ===========
  AuthMethod     Description
  ============== ===========
  **NONE**       No authentication required.
  **PASSWORD**   Password required, see tor's HashedControlPassword option.
  **COOKIE**     Contents of the cookie file required, see tor's CookieAuthentication option.
  **SAFECOOKIE** Need to reply to a hmac challenge using the contents of the cookie file.
  **UNKNOWN**    Tor provided one or more authentication methods that we don't recognize, probably something new.
  ============== ===========
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