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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def certificate_object(self):
 """ Returns the certificate as an OpenSSL object Returns the certificate as an OpenSSL object (rather than as a file object). """

        if not self.certificate:
            return None
        self.certificate.seek(0)
        return crypto.parse_certificate(self.certificate.read())