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.IX Title "X509V3_EXT_NCONF_NID 3ossl"
.TH X509V3_EXT_NCONF_NID 3ossl 2026-09-29 3.6.5 OpenSSL
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.nh
.SH NAME
X509V3_EXT_nconf, X509V3_EXT_nconf_nid \- functions to
create X.509 certificate extensions based on OpenSSL configuration
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509v3.h>
\&
\& X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
\&     const char *value);
\& X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
\&     const char *value);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBX509V3_EXT_nconf_nid()\fR and \fBX509V3_EXT_nconf()\fR create a requested X.509
extension identified either by \fIname\fR or \fIext_nid\fR correspondingly using
\&\fIvalue\fR contains the string to encode.
.PP
\&\fIconf\fR the configuration information where additional data
will be read from. \fIconf\fR will typically come from a config
file.
.PP
In case when \fIctx\fR value is null, the default one is used.
.SH NOTES
.IX Header "NOTES"
Normally these functions should not be called directly. For many extensions
they will not produce the expected results without a suitably configured
context (\fIconf\fR and \fIctx\fR arguments) that specifies the target object, issuer
data etc.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509V3_EXT_nconf()\fR and \fBX509V3_EXT_nconf_nid()\fR return an \fBX509_EXTENSION\fR
object on success and NULL on failure.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2026 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>.