X509_get_serialNumber, X509_get0_serialNumber, X509_set_serialNumber, X509_ACERT_get0_serialNumber,

       Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except in compliance
       with the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                        X509_GET_SERIALNUMBER(3SSL)

X509_get_serialNumber() returns the serial number of certificate x as an ASN1_INTEGER structure which can
       be examined or initialised. The value returned is an internal pointer which MUSTNOT be freed up after
       the call.

       X509_get0_serialNumber() is the same as X509_get_serialNumber() except it accepts a const parameter and
       returns a const result.

       X509_set_serialNumber() sets the serial number of certificate x to serial. A copy of the serial number is
       used internally so serial should be freed up after use.

       X509_ACERT_get0_serialNumber() performs the same operation as X509_get_serialNumber() for attribute
       certificates.

       X509_ACERT_set1_serialNumber() performs the same operation as X509_set_serialNumber() for attribute
       certificates.

       The X509_get_serialNumber() and X509_set_serialNumber() functions are available in all versions of
       OpenSSL.  The X509_get0_serialNumber() function was added in OpenSSL 1.1.0.  The
       X509_ACERT_get0_serialNumber() and X509_ACERT_set1_serialNumber() functions were added in OpenSSL 3.4.

       X509_get_serialNumber, X509_get0_serialNumber, X509_set_serialNumber, X509_ACERT_get0_serialNumber,
       X509_ACERT_set1_serialNumber - get or set certificate serial number

X509_get_serialNumber(), X509_get0_serialNumber() and X509_ACERT_get0_serialNumber() return a pointer to
       an ASN1_INTEGER structure.

       X509_set_serialNumber() and X509_ACERT_set1_serialNumber() return 1 for success and 0 for failure.

d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3), X509_get0_signature(3), X509_get_ext_d2i(3),
       X509_get_extension_flags(3), X509_get_pubkey(3), X509_get_subject_name(3), X509_NAME_add_entry_by_txt(3),
       X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3),
       X509_sign(3), X509V3_get_d2i(3), X509_verify_cert(3)

        #include <openssl/x509.h>

        ASN1_INTEGER *X509_get_serialNumber(X509 *x);
        const ASN1_INTEGER *X509_get0_serialNumber(const X509 *x);
        int X509_set_serialNumber(X509 *x, ASN1_INTEGER *serial);

        #include <openssl/x509_acert.h>

        ASN1_INTEGER *X509_ACERT_get0_serialNumber(X509_ACERT *x);
        int X509_ACERT_set1_serialNumber(X509_ACERT *x, ASN1_INTEGER *serial);