Method serial_number

src/cryptography/x509/base.py:408–434

Sets the certificate serial number.

(self, number: int)

        )

    def serial_number(self, number: int) -> CertificateBuilder:
        """
        Sets the certificate serial number.
        """
        if not isinstance(number, int):
            raise TypeError("Serial number must be of integral type.")
        if self._serial_number is not None:
            raise ValueError("The serial number may only be set once.")
        if number <= 0:
            raise ValueError("The serial number should be positive.")

        # ASN.1 integers are always signed, so most significant bit must be
        # zero.
        if number.bit_length() >= 160:  # As defined in RFC 5280
            raise ValueError(
                "The serial number should not be more than 159 bits."
            )
        return CertificateBuilder(
            self._issuer_name,
            self._subject_name,
            self._public_key,
            number,
            self._not_valid_before,
            self._not_valid_after,
            self._extensions,
            self._public_key_rsa_padding,
        )

    def not_valid_before(self, time: datetime.datetime) -> CertificateBuilder:
        """