=pod

=head1 NAME

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

=head1 SYNOPSIS

 #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);

=head1 DESCRIPTION

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

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

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

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

=head1 RETURN VALUES

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 B<X509_ATTRIBUTE> pointer on
success or NULL on failure.

=head1 SEE ALSO

L<X509_ACERT_get_attr_count(3)>

=head1 HISTORY

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.

=head1 COPYRIGHT

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
L<https://www.openssl.org/source/license.html>.

=cut
