X509_ACERT_get_attr, X509_ACERT_get_attr_by_NID, X509_ACERT_get_attr_by_OBJ, X509_ACERT_get_attr_count -

       Copyright 2023-2024 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_ACERT_GET_ATTR(3SSL)

X509_ACERT_get0_attr() retrieves the locth X509_ATTRIBUTE from an X509_ACERTx.
       X509_ACERT_get_attr_count() returns the total number of attributes in the X509_ACERT.

       X509_ACERT_get_attr_by_NID() and X509_ACERT_get_attr_by_OBJ() retrieve the next attribute location
       matching nid or obj after lastpos. lastpos should initially be set to -1.  If there are no more entries
       -1 is returned. If nid is invalid (doesn't correspond to a valid OID) then -2 is returned.

X509_ACERT_get0_attr(), X509_ACERT_get_attr_by_NID(), X509_ACERT_get_attr_by_OBJ() and
       X509_ACERT_get_attr_count() were added in OpenSSL 3.4.

       X509_ACERT_get_attr, X509_ACERT_get_attr_by_NID, X509_ACERT_get_attr_by_OBJ, X509_ACERT_get_attr_count -
       Retrieve attributes from an X509_ACERT structure

X509_ACERT_get0_attr() return a X509_ATTRIBUTE from an attribute certificate, or NULL if the specified
       attribute is not found.

       X509_ACERT_get_attr_by_NID() and X509_ACERT_get_attr_by_OBJ() return the location of the next attribute
       requested or -1 if not found.  X509_ACERT_get_attr_by_NID() can also return -2 if the supplied NID is
       invalid.

       X509_ACERT_get_attr_count() returns the number of attributes in the given attribute certificate.

        #include <openssl/x509_acert.h>

        X509_ATTRIBUTE *X509_ACERT_get_attr(const X509_ACERT *x, int loc);
        int X509_ACERT_get_attr_by_NID(const X509_ACERT *x, int nid, int lastpos);
        int X509_ACERT_get_attr_by_OBJ(const X509_ACERT *x, const ASN1_OBJECT *obj,
                                       int lastpos);
        int X509_ACERT_get_attr_count(const X509_ACERT *x);