'Decrypt a previously encrypted string, returning the orignal data'

def decrypt(self, data, trailer):

    encbuf = win32security.PySecBufferDescType()
    encbuf.append(win32security.PySecBufferType(len(data), sspicon.SECBUFFER_DATA))
    encbuf.append(win32security.PySecBufferType(len(trailer), sspicon.SECBUFFER_TOKEN))
    encbuf[0].Buffer = data
    encbuf[1].Buffer = trailer
    self.ctxt.DecryptMessage(encbuf, self._get_next_seq_num())
    return encbuf[0].Buffer
