X509_ACERT_add1_attr, X509_ACERT_add1_attr_by_NID, X509_ACERT_add1_attr_by_OBJ,

       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_ADD1_ATTR(3SSL)

X509_ACERT_add1_attr() adds a constructed X509_ATTRIBUTE attr to the existing X509_ACERT structure x.

       X509_ACERT_add1_attr_by_NID() and X509_ACERT_add1_attr_by_OBJ() add an attribute of type nid or obj with
       a value of ASN1 type type constructed using len bytes from bytes.

       X509_ACERT_add1_attr_by_txt() adds an attribute of type attrname with a value of ASN1 type type
       constructed using len bytes from bytes.

       X509_ACERT_delete_attr() will delete the locth attribute from x and return a pointer to it or NULL if
       there are fewer than loc attributes contained in x.

X509_ACERT_add1_attr(), X509_ACERT_add1_attr_by_NID(), X509_ACERT_add1_attr_by_OBJ(),
       X509_ACERT_add1_attr_by_txt() and X509_ACERT_delete_attr() were added in OpenSSL 3.4.

       X509_ACERT_add1_attr, X509_ACERT_add1_attr_by_NID, X509_ACERT_add1_attr_by_OBJ,
       X509_ACERT_add1_attr_by_txt, X509_ACERT_delete_attr - X509_ACERT attribute functions

X509_ACERT_add1_attr(), X509_ACERT_add1_attr_by_NID(), and X509_ACERT_add1_attr_by_OBJ() return 1 for
       success and 0 for failure.

       X509_ACERT_delete_attr() returns a X509_ATTRIBUTE pointer on success or NULL on failure.

X509_ACERT_get_attr_count(3)

        #include <openssl/x509_acert.h>

        int X509_ACERT_add1_attr(X509_ACERT *x, X509_ATTRIBUTE *attr);
        int X509_ACERT_add1_attr_by_NID(X509_ACERT *x, int nid, int type,
                                        const void *bytes, int len);
        int X509_ACERT_add1_attr_by_OBJ(X509_ACERT *x, const ASN1_OBJECT *obj,
                                        int type, const void *bytes, int len);
        int X509_ACERT_add1_attr_by_txt(X509_ACERT *x, const char *attrname, int type,
                                        const unsigned char *bytes, int len);
        X509_ATTRIBUTE *X509_ACERT_delete_attr(X509_ACERT *x, int loc);