def __init__(self, username=None, password=None, sharedKey=None, certChain=None, privateKey=None, cryptoID=None, protocol=None, x509Fingerprint=None, x509TrustList=None, x509CommonName=None, settings=None):
    "\n        For client authentication, use one of these argument\n        combinations:\n         - username, password (SRP)\n         - username, sharedKey (shared-key)\n         - certChain, privateKey (certificate)\n\n        For server authentication, you can either rely on the\n        implicit mutual authentication performed by SRP or\n        shared-keys, or you can do certificate-based server\n        authentication with one of these argument combinations:\n         - cryptoID[, protocol] (requires cryptoIDlib)\n         - x509Fingerprint\n         - x509TrustList[, x509CommonName] (requires cryptlib_py)\n\n        Certificate-based server authentication is compatible with\n        SRP or certificate-based client authentication.  It is\n        not compatible with shared-keys.\n\n        The constructor does not perform the TLS handshake itself, but\n        simply stores these arguments for later.  The handshake is\n        performed only when this class needs to connect with the\n        server.  Then you should be prepared to handle TLS-specific\n        exceptions.  See the client handshake functions in\n        L{tlslite.TLSConnection.TLSConnection} for details on which\n        exceptions might be raised.\n\n        @type username: str\n        @param username: SRP or shared-key username.  Requires the\n        'password' or 'sharedKey' argument.\n\n        @type password: str\n        @param password: SRP password for mutual authentication.\n        Requires the 'username' argument.\n\n        @type sharedKey: str\n        @param sharedKey: Shared key for mutual authentication.\n        Requires the 'username' argument.\n\n        @type certChain: L{tlslite.X509CertChain.X509CertChain} or\n        L{cryptoIDlib.CertChain.CertChain}\n        @param certChain: Certificate chain for client authentication.\n        Requires the 'privateKey' argument.  Excludes the SRP or\n        shared-key related arguments.\n\n        @type privateKey: L{tlslite.utils.RSAKey.RSAKey}\n        @param privateKey: Private key for client authentication.\n        Requires the 'certChain' argument.  Excludes the SRP or\n        shared-key related arguments.\n\n        @type cryptoID: str\n        @param cryptoID: cryptoID for server authentication.  Mutually\n        exclusive with the 'x509...' arguments.\n\n        @type protocol: str\n        @param protocol: cryptoID protocol URI for server\n        authentication.  Requires the 'cryptoID' argument.\n\n        @type x509Fingerprint: str\n        @param x509Fingerprint: Hex-encoded X.509 fingerprint for\n        server authentication.  Mutually exclusive with the 'cryptoID'\n        and 'x509TrustList' arguments.\n\n        @type x509TrustList: list of L{tlslite.X509.X509}\n        @param x509TrustList: A list of trusted root certificates.  The\n        other party must present a certificate chain which extends to\n        one of these root certificates.  The cryptlib_py module must be\n        installed to use this parameter.  Mutually exclusive with the\n        'cryptoID' and 'x509Fingerprint' arguments.\n\n        @type x509CommonName: str\n        @param x509CommonName: The end-entity certificate's 'CN' field\n        must match this value.  For a web server, this is typically a\n        server name such as 'www.amazon.com'.  Mutually exclusive with\n        the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the\n        'x509TrustList' argument.\n\n        @type settings: L{tlslite.HandshakeSettings.HandshakeSettings}\n        @param settings: Various settings which can be used to control\n        the ciphersuites, certificate types, and SSL/TLS versions\n        offered by the client.\n        "
    self.username = None
    self.password = None
    self.sharedKey = None
    self.certChain = None
    self.privateKey = None
    self.checker = None
    if (username and password and (not (sharedKey or certChain or privateKey))):
        self.username = username
        self.password = password
    elif (username and sharedKey and (not (password or certChain or privateKey))):
        self.username = username
        self.sharedKey = sharedKey
    elif (certChain and privateKey and (not (username or password or sharedKey))):
        self.certChain = certChain
        self.privateKey = privateKey
    elif ((not password) and (not username) and (not sharedKey) and (not certChain) and (not privateKey)):
        pass
    else:
        raise ValueError('Bad parameters')
    if (sharedKey and (cryptoID or protocol or x509Fingerprint)):
        raise ValueError("Can't use shared keys with other forms ofauthentication")
    self.checker = Checker(cryptoID, protocol, x509Fingerprint, x509TrustList, x509CommonName)
    self.settings = settings
    self.tlsSession = None
For client authentication, use one of these argument
combinations:
 - username, password (SRP)
 - username, sharedKey (shared-key)
 - certChain, privateKey (certificate)

For server authentication, you can either rely on the
implicit mutual authentication performed by SRP or
shared-keys, or you can do certificate-based server
authentication with one of these argument combinations:
 - cryptoID[, protocol] (requires cryptoIDlib)
 - x509Fingerprint
 - x509TrustList[, x509CommonName] (requires cryptlib_py)

Certificate-based server authentication is compatible with
SRP or certificate-based client authentication.  It is
not compatible with shared-keys.

The constructor does not perform the TLS handshake itself, but
simply stores these arguments for later.  The handshake is
performed only when this class needs to connect with the
server.  Then you should be prepared to handle TLS-specific
exceptions.  See the client handshake functions in
L{tlslite.TLSConnection.TLSConnection} for details on which
exceptions might be raised.

@type username: str
@param username: SRP or shared-key username.  Requires the
'password' or 'sharedKey' argument.

@type password: str
@param password: SRP password for mutual authentication.
Requires the 'username' argument.

@type sharedKey: str
@param sharedKey: Shared key for mutual authentication.
Requires the 'username' argument.

@type certChain: L{tlslite.X509CertChain.X509CertChain} or
L{cryptoIDlib.CertChain.CertChain}
@param certChain: Certificate chain for client authentication.
Requires the 'privateKey' argument.  Excludes the SRP or
shared-key related arguments.

@type privateKey: L{tlslite.utils.RSAKey.RSAKey}
@param privateKey: Private key for client authentication.
Requires the 'certChain' argument.  Excludes the SRP or
shared-key related arguments.

@type cryptoID: str
@param cryptoID: cryptoID for server authentication.  Mutually
exclusive with the 'x509...' arguments.

@type protocol: str
@param protocol: cryptoID protocol URI for server
authentication.  Requires the 'cryptoID' argument.

@type x509Fingerprint: str
@param x509Fingerprint: Hex-encoded X.509 fingerprint for
server authentication.  Mutually exclusive with the 'cryptoID'
and 'x509TrustList' arguments.

@type x509TrustList: list of L{tlslite.X509.X509}
@param x509TrustList: A list of trusted root certificates.  The
other party must present a certificate chain which extends to
one of these root certificates.  The cryptlib_py module must be
installed to use this parameter.  Mutually exclusive with the
'cryptoID' and 'x509Fingerprint' arguments.

@type x509CommonName: str
@param x509CommonName: The end-entity certificate's 'CN' field
must match this value.  For a web server, this is typically a
server name such as 'www.amazon.com'.  Mutually exclusive with
the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the
'x509TrustList' argument.

@type settings: L{tlslite.HandshakeSettings.HandshakeSettings}
@param settings: Various settings which can be used to control
the ciphersuites, certificate types, and SSL/TLS versions
offered by the client.
def __init__(self, username=None, password=None, sharedKey=None, certChain=None, privateKey=None, cryptoID=None, protocol=None, x509Fingerprint=None, x509TrustList=None, x509CommonName=None, settings=None):
    "\n        For client authentication, use one of these argument\n        combinations:\n         - username, password (SRP)\n         - username, sharedKey (shared-key)\n         - certChain, privateKey (certificate)\n\n        For server authentication, you can either rely on the\n        implicit mutual authentication performed by SRP or\n        shared-keys, or you can do certificate-based server\n        authentication with one of these argument combinations:\n         - cryptoID[, protocol] (requires cryptoIDlib)\n         - x509Fingerprint\n         - x509TrustList[, x509CommonName] (requires cryptlib_py)\n\n        Certificate-based server authentication is compatible with\n        SRP or certificate-based client authentication.  It is\n        not compatible with shared-keys.\n\n        The constructor does not perform the TLS handshake itself, but\n        simply stores these arguments for later.  The handshake is\n        performed only when this class needs to connect with the\n        server.  Then you should be prepared to handle TLS-specific\n        exceptions.  See the client handshake functions in\n        L{tlslite.TLSConnection.TLSConnection} for details on which\n        exceptions might be raised.\n\n        @type username: str\n        @param username: SRP or shared-key username.  Requires the\n        'password' or 'sharedKey' argument.\n\n        @type password: str\n        @param password: SRP password for mutual authentication.\n        Requires the 'username' argument.\n\n        @type sharedKey: str\n        @param sharedKey: Shared key for mutual authentication.\n        Requires the 'username' argument.\n\n        @type certChain: L{tlslite.X509CertChain.X509CertChain} or\n        L{cryptoIDlib.CertChain.CertChain}\n        @param certChain: Certificate chain for client authentication.\n        Requires the 'privateKey' argument.  Excludes the SRP or\n        shared-key related arguments.\n\n        @type privateKey: L{tlslite.utils.RSAKey.RSAKey}\n        @param privateKey: Private key for client authentication.\n        Requires the 'certChain' argument.  Excludes the SRP or\n        shared-key related arguments.\n\n        @type cryptoID: str\n        @param cryptoID: cryptoID for server authentication.  Mutually\n        exclusive with the 'x509...' arguments.\n\n        @type protocol: str\n        @param protocol: cryptoID protocol URI for server\n        authentication.  Requires the 'cryptoID' argument.\n\n        @type x509Fingerprint: str\n        @param x509Fingerprint: Hex-encoded X.509 fingerprint for\n        server authentication.  Mutually exclusive with the 'cryptoID'\n        and 'x509TrustList' arguments.\n\n        @type x509TrustList: list of L{tlslite.X509.X509}\n        @param x509TrustList: A list of trusted root certificates.  The\n        other party must present a certificate chain which extends to\n        one of these root certificates.  The cryptlib_py module must be\n        installed to use this parameter.  Mutually exclusive with the\n        'cryptoID' and 'x509Fingerprint' arguments.\n\n        @type x509CommonName: str\n        @param x509CommonName: The end-entity certificate's 'CN' field\n        must match this value.  For a web server, this is typically a\n        server name such as 'www.amazon.com'.  Mutually exclusive with\n        the 'cryptoID' and 'x509Fingerprint' arguments.  Requires the\n        'x509TrustList' argument.\n\n        @type settings: L{tlslite.HandshakeSettings.HandshakeSettings}\n        @param settings: Various settings which can be used to control\n        the ciphersuites, certificate types, and SSL/TLS versions\n        offered by the client.\n        "
    self.username = None
    self.password = None
    self.sharedKey = None
    self.certChain = None
    self.privateKey = None
    self.checker = None
    if (username and password and (not (sharedKey or certChain or privateKey))):
        self.username = username
        self.password = password
    elif (username and sharedKey and (not (password or certChain or privateKey))):
        self.username = username
        self.sharedKey = sharedKey
    elif (certChain and privateKey and (not (username or password or sharedKey))):
        self.certChain = certChain
        self.privateKey = privateKey
    elif ((not password) and (not username) and (not sharedKey) and (not certChain) and (not privateKey)):
        pass
    else:
        raise ValueError('Bad parameters')
    if (sharedKey and (cryptoID or protocol or x509Fingerprint)):
        raise ValueError("Can't use shared keys with other forms ofauthentication")
    self.checker = Checker(cryptoID, protocol, x509Fingerprint, x509TrustList, x509CommonName)
    self.settings = settings
    self.tlsSession = None