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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.0102 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+. ds C` ""
+. ds C' ""
+'br\}
+.el\{\
+. ds C`
+. ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+. if \nF \{\
+. de IX
+. tm Index:\\$1\t\\n%\t"\\$2"
+..
+. if !\nF==2 \{\
+. nr % 0
+. nr F 2
+. \}
+. \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "X509_ADD_CERT 3ossl"
+.TH X509_ADD_CERT 3ossl 2025-09-30 3.5.4 OpenSSL
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+X509_add_cert,
+X509_add_certs \-
+X509 certificate list addition functions
+.SH SYNOPSIS
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/x509.h>
+\&
+\& int X509_add_cert(STACK_OF(X509) *sk, X509 *cert, int flags);
+\& int X509_add_certs(STACK_OF(X509) *sk, STACK_OF(X509) *certs, int flags);
+.Ve
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+\&\fBX509_add_cert()\fR adds a certificate \fIcert\fR to the given list \fIsk\fR.
+It is an error for the \fIcert\fR argument to be NULL.
+.PP
+\&\fBX509_add_certs()\fR adds a list of certificate \fIcerts\fR to the given list \fIsk\fR.
+The \fIcerts\fR argument may be NULL, which implies no effect.
+It does not modify the list \fIcerts\fR but
+in case the \fBX509_ADD_FLAG_UP_REF\fR flag (described below) is set
+the reference counters of those of its members added to \fIsk\fR are increased.
+.PP
+Both these functions have a \fIflags\fR parameter,
+which is used to control details of the operation.
+.PP
+The value \fBX509_ADD_FLAG_DEFAULT\fR, which equals 0, means no special semantics.
+.PP
+If \fBX509_ADD_FLAG_UP_REF\fR is set then
+the reference counts of those certificates added successfully are increased.
+.PP
+If \fBX509_ADD_FLAG_PREPEND\fR is set then the certificates are prepended to \fIsk\fR.
+By default they are appended to \fIsk\fR.
+In both cases the original order of the added certificates is preserved.
+.PP
+If \fBX509_ADD_FLAG_NO_DUP\fR is set then certificates already contained in \fIsk\fR,
+which is determined using \fBX509_cmp\fR\|(3), are ignored.
+.PP
+If \fBX509_ADD_FLAG_NO_SS\fR is set then certificates that are marked self-signed,
+which is determined using \fBX509_self_signed\fR\|(3), are ignored.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+Both functions return 1 for success and 0 for failure.
+.SH NOTES
+.IX Header "NOTES"
+If \fBX509_add_certs()\fR is used with the flags \fBX509_ADD_FLAG_NO_DUP\fR or
+\&\fBX509_ADD_FLAG_NO_SS\fR it is advisable to use also \fBX509_ADD_FLAG_UP_REF\fR
+because otherwise likely not for all members of the \fIcerts\fR list
+the ownership is transferred to the list of certificates \fIsk\fR.
+.PP
+Care should also be taken in case the \fIcerts\fR argument equals \fIsk\fR.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBX509_cmp\fR\|(3)
+\&\fBX509_self_signed\fR\|(3)
+.SH HISTORY
+.IX Header "HISTORY"
+The functions \fBX509_add_cert()\fR and \fBX509_add_certs()\fR
+were added in OpenSSL 3.0.
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2019\-2025 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+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>.