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<p><a name="__index__"></a></p>
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<li><a href="#notes">NOTES</a></li>
<li><a href="#return_values">RETURN VALUES</a></li>
<li><a href="#see_also">SEE ALSO</a></li>
<li><a href="#copyright">COPYRIGHT</a></li>
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<p>
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<hr />
<h1><a name="name">NAME</a></h1>
<p>X509v3_get_ext_count, X509v3_get_ext, X509v3_get_ext_by_NID,
X509v3_get_ext_by_OBJ, X509v3_get_ext_by_critical, X509v3_delete_ext,
X509v3_add_ext, X509_get_ext_count, X509_get_ext,
X509_get_ext_by_NID, X509_get_ext_by_OBJ, X509_get_ext_by_critical,
X509_delete_ext, X509_add_ext, X509_CRL_get_ext_count, X509_CRL_get_ext,
X509_CRL_get_ext_by_NID, X509_CRL_get_ext_by_OBJ, X509_CRL_get_ext_by_critical,
X509_CRL_delete_ext, X509_CRL_add_ext, X509_REVOKED_get_ext_count,
X509_REVOKED_get_ext, X509_REVOKED_get_ext_by_NID, X509_REVOKED_get_ext_by_OBJ,
X509_REVOKED_get_ext_by_critical, X509_REVOKED_delete_ext,
X509_REVOKED_add_ext - extension stack utility functions</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/x509.h></pre>
<pre>
int X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *x);
X509_EXTENSION *X509v3_get_ext(const STACK_OF(X509_EXTENSION) *x, int loc);</pre>
<pre>
int X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *x,
int nid, int lastpos);
int X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *x,
const ASN1_OBJECT *obj, int lastpos);
int X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *x,
int crit, int lastpos);
X509_EXTENSION *X509v3_delete_ext(STACK_OF(X509_EXTENSION) *x, int loc);
STACK_OF(X509_EXTENSION) *X509v3_add_ext(STACK_OF(X509_EXTENSION) **x,
X509_EXTENSION *ex, int loc);</pre>
<pre>
int X509_get_ext_count(const X509 *x);
X509_EXTENSION *X509_get_ext(const X509 *x, int loc);
int X509_get_ext_by_NID(const X509 *x, int nid, int lastpos);
int X509_get_ext_by_OBJ(const X509 *x, const ASN1_OBJECT *obj, int lastpos);
int X509_get_ext_by_critical(const X509 *x, int crit, int lastpos);
X509_EXTENSION *X509_delete_ext(X509 *x, int loc);
int X509_add_ext(X509 *x, X509_EXTENSION *ex, int loc);</pre>
<pre>
int X509_CRL_get_ext_count(const X509_CRL *x);
X509_EXTENSION *X509_CRL_get_ext(const X509_CRL *x, int loc);
int X509_CRL_get_ext_by_NID(const X509_CRL *x, int nid, int lastpos);
int X509_CRL_get_ext_by_OBJ(const X509_CRL *x, const ASN1_OBJECT *obj, int lastpos);
int X509_CRL_get_ext_by_critical(const X509_CRL *x, int crit, int lastpos);
X509_EXTENSION *X509_CRL_delete_ext(X509_CRL *x, int loc);
int X509_CRL_add_ext(X509_CRL *x, X509_EXTENSION *ex, int loc);</pre>
<pre>
int X509_REVOKED_get_ext_count(const X509_REVOKED *x);
X509_EXTENSION *X509_REVOKED_get_ext(const X509_REVOKED *x, int loc);
int X509_REVOKED_get_ext_by_NID(const X509_REVOKED *x, int nid, int lastpos);
int X509_REVOKED_get_ext_by_OBJ(const X509_REVOKED *x, const ASN1_OBJECT *obj,
int lastpos);
int X509_REVOKED_get_ext_by_critical(const X509_REVOKED *x, int crit, int lastpos);
X509_EXTENSION *X509_REVOKED_delete_ext(X509_REVOKED *x, int loc);
int X509_REVOKED_add_ext(X509_REVOKED *x, X509_EXTENSION *ex, int loc);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>X509v3_get_ext_count() retrieves the number of extensions in <strong>x</strong>.</p>
<p>X509v3_get_ext() retrieves extension <strong>loc</strong> from <strong>x</strong>. The index <strong>loc</strong>
can take any value from <strong>0</strong> to X509_get_ext_count(x) - 1. The returned
extension is an internal pointer which <strong>must not</strong> be freed up by the
application.</p>
<p>X509v3_get_ext_by_NID() and X509v3_get_ext_by_OBJ() look for an extension
with <strong>nid</strong> or <strong>obj</strong> from extension stack <strong>x</strong>. The search starts from the
extension after <strong>lastpos</strong> or from the beginning if <lastpos> is <strong>-1</strong>. If
the extension is found its index is returned otherwise <strong>-1</strong> is returned.</p>
<p>X509v3_get_ext_by_critical() is similar to X509v3_get_ext_by_NID() except it
looks for an extension of criticality <strong>crit</strong>. A zero value for <strong>crit</strong>
looks for a non-critical extension a nonzero value looks for a critical
extension.</p>
<p>X509v3_delete_ext() deletes the extension with index <strong>loc</strong> from <strong>x</strong>. The
deleted extension is returned and must be freed by the caller. If <strong>loc</strong>
is in invalid index value <strong>NULL</strong> is returned.</p>
<p>X509v3_add_ext() adds extension <strong>ex</strong> to stack <strong>*x</strong> at position <strong>loc</strong>. If
<strong>loc</strong> is <strong>-1</strong> the new extension is added to the end. If <strong>*x</strong> is <strong>NULL</strong>
a new stack will be allocated. The passed extension <strong>ex</strong> is duplicated
internally so it must be freed after use.</p>
<p>X509_get_ext_count(), X509_get_ext(), X509_get_ext_by_NID(),
X509_get_ext_by_OBJ(), X509_get_ext_by_critical(), X509_delete_ext()
and X509_add_ext() operate on the extensions of certificate <strong>x</strong> they are
otherwise identical to the X509v3 functions.</p>
<p>X509_CRL_get_ext_count(), X509_CRL_get_ext(), X509_CRL_get_ext_by_NID(),
X509_CRL_get_ext_by_OBJ(), X509_CRL_get_ext_by_critical(),
X509_CRL_delete_ext() and X509_CRL_add_ext() operate on the extensions of
CRL <strong>x</strong> they are otherwise identical to the X509v3 functions.</p>
<p>X509_REVOKED_get_ext_count(), X509_REVOKED_get_ext(),
X509_REVOKED_get_ext_by_NID(), X509_REVOKED_get_ext_by_OBJ(),
X509_REVOKED_get_ext_by_critical(), X509_REVOKED_delete_ext() and
X509_REVOKED_add_ext() operate on the extensions of CRL entry <strong>x</strong>
they are otherwise identical to the X509v3 functions.</p>
<p>
</p>
<hr />
<h1><a name="notes">NOTES</a></h1>
<p>These functions are used to examine stacks of extensions directly. Many
applications will want to parse or encode and add an extension: they should
use the extension encode and decode functions instead such as
X509_add1_ext_i2d() and X509_get_ext_d2i().</p>
<p>Extension indices start from zero, so a zero index return value is <strong>not</strong> an
error. These search functions start from the extension <strong>after</strong> the <strong>lastpos</strong>
parameter so it should initially be set to <strong>-1</strong>, if it is set to zero the
initial extension will not be checked.</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p>X509v3_get_ext_count() returns the extension count.</p>
<p>X509v3_get_ext(), X509v3_delete_ext() and X509_delete_ext() return an
<strong>X509_EXTENSION</strong> pointer or <strong>NULL</strong> if an error occurs.</p>
<p>X509v3_get_ext_by_NID() X509v3_get_ext_by_OBJ() and
X509v3_get_ext_by_critical() return the an extension index or <strong>-1</strong> if an
error occurs.</p>
<p>X509v3_add_ext() returns a stack of extensions or <strong>NULL</strong> on error.</p>
<p>X509_add_ext() returns 1 on success and 0 on error.</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>X509V3_get_d2i(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (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
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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