'If the key portion of the entry is valid base64, but is not actually an
SSH key, C{fromString} should raise L{BadKeyError}.'

def badKeyTest(self, cls, prefix):

    self.assertRaises(BadKeyError, cls.fromString, '    '.join([prefix, 'ssh-rsa', b2a_base64("Hey,    this    isn't    an    SSH    key!").strip()]))
