def verify_ssh_sig(self, data, msg):
return False<EOL>
Given a blob of data, and an SSH message representing a signature of
that data, verify that it was signed with this key.

@param data: the data that was signed.
@type data: str
@param msg: an SSH signature message
@type msg: L{Message}
@return: C{True} if the signature verifies correctly; C{False}
    otherwise.
@rtype: boolean