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<ul id="index">
  <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="#SUPPORTED-EXTENSIONS">SUPPORTED EXTENSIONS</a>
    <ul>
      <li><a href="#PKIX-Certificate-Extensions">PKIX Certificate Extensions</a></li>
      <li><a href="#Netscape-Certificate-Extensions">Netscape Certificate Extensions</a></li>
      <li><a href="#Miscellaneous-Certificate-Extensions">Miscellaneous Certificate Extensions</a></li>
      <li><a href="#PKIX-CRL-Extensions">PKIX CRL Extensions</a></li>
      <li><a href="#OCSP-Extensions">OCSP Extensions</a></li>
      <li><a href="#Certificate-Transparency-Extensions">Certificate Transparency Extensions</a></li>
    </ul>
  </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>
</ul>

<h1 id="NAME">NAME</h1>

<p>X509_get0_extensions, X509_CRL_get0_extensions, X509_REVOKED_get0_extensions, X509V3_get_d2i, X509V3_add1_i2d, X509V3_EXT_d2i, X509V3_EXT_i2d, X509_get_ext_d2i, X509_add1_ext_i2d, X509_CRL_get_ext_d2i, X509_CRL_add1_ext_i2d, X509_REVOKED_get_ext_d2i, X509_REVOKED_add1_ext_i2d - X509 extension decode and encode functions</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/x509v3.h&gt;

 void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
                      int *idx);
 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
                     int crit, unsigned long flags);

 void *X509V3_EXT_d2i(X509_EXTENSION *ext);
 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext);

 void *X509_get_ext_d2i(const X509 *x, int nid, int *crit, int *idx);
 int X509_add1_ext_i2d(X509 *x, int nid, void *value, int crit,
                       unsigned long flags);

 void *X509_CRL_get_ext_d2i(const X509_CRL *crl, int nid, int *crit, int *idx);
 int X509_CRL_add1_ext_i2d(X509_CRL *crl, int nid, void *value, int crit,
                           unsigned long flags);

 void *X509_REVOKED_get_ext_d2i(const X509_REVOKED *r, int nid, int *crit, int *idx);
 int X509_REVOKED_add1_ext_i2d(X509_REVOKED *r, int nid, void *value, int crit,
                               unsigned long flags);

 const STACK_OF(X509_EXTENSION) *X509_get0_extensions(const X509 *x);
 const STACK_OF(X509_EXTENSION) *X509_CRL_get0_extensions(const X509_CRL *crl);
 const STACK_OF(X509_EXTENSION) *X509_REVOKED_get0_extensions(const X509_REVOKED *r);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>X509V3_get_ext_d2i() looks for an extension with OID <b>nid</b> in the extensions <b>x</b> and, if found, decodes it. If <b>idx</b> is <b>NULL</b> then only one occurrence of an extension is permissible otherwise the first extension after index <b>*idx</b> is returned and <b>*idx</b> updated to the location of the extension. If <b>crit</b> is not <b>NULL</b> then <b>*crit</b> is set to a status value: -2 if the extension occurs multiple times (this is only returned if <b>idx</b> is <b>NULL</b>), -1 if the extension could not be found, 0 if the extension is found and is not critical and 1 if critical. A pointer to an extension specific structure or <b>NULL</b> is returned.</p>

<p>X509V3_add1_i2d() adds extension <b>value</b> to STACK <b>*x</b> (allocating a new STACK if necessary) using OID <b>nid</b> and criticality <b>crit</b> according to <b>flags</b>.</p>

<p>X509V3_EXT_d2i() attempts to decode the ASN.1 data contained in extension <b>ext</b> and returns a pointer to an extension specific structure or <b>NULL</b> if the extension could not be decoded (invalid syntax or not supported).</p>

<p>X509V3_EXT_i2d() encodes the extension specific structure <b>ext</b> with OID <b>ext_nid</b> and criticality <b>crit</b>.</p>

<p>X509_get_ext_d2i() and X509_add1_ext_i2d() operate on the extensions of certificate <b>x</b>, they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().</p>

<p>X509_CRL_get_ext_d2i() and X509_CRL_add1_ext_i2d() operate on the extensions of CRL <b>crl</b>, they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().</p>

<p>X509_REVOKED_get_ext_d2i() and X509_REVOKED_add1_ext_i2d() operate on the extensions of <b>X509_REVOKED</b> structure <b>r</b> (i.e for CRL entry extensions), they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().</p>

<p>X509_get0_extensions(), X509_CRL_get0_extensions() and X509_REVOKED_get0_extensions() return a stack of all the extensions of a certificate a CRL or a CRL entry respectively.</p>

<h1 id="NOTES">NOTES</h1>

<p>In almost all cases an extension can occur at most once and multiple occurrences is an error. Therefore, the <b>idx</b> parameter is usually <b>NULL</b>.</p>

<p>The <b>flags</b> parameter may be one of the following values.</p>

<p><b>X509V3_ADD_DEFAULT</b> appends a new extension only if the extension does not already exist. An error is returned if the extension does already exist.</p>

<p><b>X509V3_ADD_APPEND</b> appends a new extension, ignoring whether the extension already exists.</p>

<p><b>X509V3_ADD_REPLACE</b> replaces an extension if it exists otherwise appends a new extension.</p>

<p><b>X509V3_ADD_REPLACE_EXISTING</b> replaces an existing extension if it exists otherwise returns an error.</p>

<p><b>X509V3_ADD_KEEP_EXISTING</b> appends a new extension only if the extension does not already exist. An error <b>is not</b> returned if the extension does already exist.</p>

<p><b>X509V3_ADD_DELETE</b> extension <b>nid</b> is deleted: no new extension is added.</p>

<p>If <b>X509V3_ADD_SILENT</b> is ored with <b>flags</b>: any error returned will not be added to the error queue.</p>

<p>The function X509V3_get_d2i() will return <b>NULL</b> if the extension is not found, occurs multiple times or cannot be decoded. It is possible to determine the precise reason by checking the value of <b>*crit</b>.</p>

<h1 id="SUPPORTED-EXTENSIONS">SUPPORTED EXTENSIONS</h1>

<p>The following sections contain a list of all supported extensions including their name and NID.</p>

<h2 id="PKIX-Certificate-Extensions">PKIX Certificate Extensions</h2>

<p>The following certificate extensions are defined in PKIX standards such as RFC5280.</p>

<pre><code> Basic Constraints                  NID_basic_constraints
 Key Usage                          NID_key_usage
 Extended Key Usage                 NID_ext_key_usage

 Subject Key Identifier             NID_subject_key_identifier
 Authority Key Identifier           NID_authority_key_identifier

 Private Key Usage Period           NID_private_key_usage_period

 Subject Alternative Name           NID_subject_alt_name
 Issuer Alternative Name            NID_issuer_alt_name

 Authority Information Access       NID_info_access
 Subject Information Access         NID_sinfo_access

 Name Constraints                   NID_name_constraints

 Certificate Policies               NID_certificate_policies
 Policy Mappings                    NID_policy_mappings
 Policy Constraints                 NID_policy_constraints
 Inhibit Any Policy                 NID_inhibit_any_policy

 TLS Feature                        NID_tlsfeature</code></pre>

<h2 id="Netscape-Certificate-Extensions">Netscape Certificate Extensions</h2>

<p>The following are (largely obsolete) Netscape certificate extensions.</p>

<pre><code> Netscape Cert Type                 NID_netscape_cert_type
 Netscape Base Url                  NID_netscape_base_url
 Netscape Revocation Url            NID_netscape_revocation_url
 Netscape CA Revocation Url         NID_netscape_ca_revocation_url
 Netscape Renewal Url               NID_netscape_renewal_url
 Netscape CA Policy Url             NID_netscape_ca_policy_url
 Netscape SSL Server Name           NID_netscape_ssl_server_name
 Netscape Comment                   NID_netscape_comment</code></pre>

<h2 id="Miscellaneous-Certificate-Extensions">Miscellaneous Certificate Extensions</h2>

<pre><code> Strong Extranet ID                 NID_sxnet
 Proxy Certificate Information      NID_proxyCertInfo</code></pre>

<h2 id="PKIX-CRL-Extensions">PKIX CRL Extensions</h2>

<p>The following are CRL extensions from PKIX standards such as RFC5280.</p>

<pre><code> CRL Number                         NID_crl_number
 CRL Distribution Points            NID_crl_distribution_points
 Delta CRL Indicator                NID_delta_crl
 Freshest CRL                       NID_freshest_crl
 Invalidity Date                    NID_invalidity_date
 Issuing Distribution Point         NID_issuing_distribution_point</code></pre>

<p>The following are CRL entry extensions from PKIX standards such as RFC5280.</p>

<pre><code> CRL Reason Code                    NID_crl_reason
 Certificate Issuer                 NID_certificate_issuer</code></pre>

<h2 id="OCSP-Extensions">OCSP Extensions</h2>

<pre><code> OCSP Nonce                         NID_id_pkix_OCSP_Nonce
 OCSP CRL ID                        NID_id_pkix_OCSP_CrlID
 Acceptable OCSP Responses          NID_id_pkix_OCSP_acceptableResponses
 OCSP No Check                      NID_id_pkix_OCSP_noCheck
 OCSP Archive Cutoff                NID_id_pkix_OCSP_archiveCutoff
 OCSP Service Locator               NID_id_pkix_OCSP_serviceLocator
 Hold Instruction Code              NID_hold_instruction_code</code></pre>

<h2 id="Certificate-Transparency-Extensions">Certificate Transparency Extensions</h2>

<p>The following extensions are used by certificate transparency, RFC6962</p>

<pre><code> CT Precertificate SCTs             NID_ct_precert_scts
 CT Certificate SCTs                NID_ct_cert_scts</code></pre>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>X509V3_EXT_d2i() and *X509V3_get_d2i() return a pointer to an extension specific structure of <b>NULL</b> if an error occurs.</p>

<p>X509V3_EXT_i2d() returns a pointer to an <b>X509_EXTENSION</b> structure or <b>NULL</b> if an error occurs.</p>

<p>X509V3_add1_i2d() returns 1 if the operation is successful and 0 if it fails due to a non-fatal error (extension not found, already exists, cannot be encoded) or -1 due to a fatal error such as a memory allocation failure.</p>

<p>X509_get0_extensions(), X509_CRL_get0_extensions() and X509_REVOKED_get0_extensions() return a stack of extensions. They return NULL if no extensions are present.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/d2i_X509.html">d2i_X509(3)</a>, <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/X509_CRL_get0_by_serial.html">X509_CRL_get0_by_serial(3)</a>, <a href="../man3/X509_get0_signature.html">X509_get0_signature(3)</a>, <a href="../man3/X509_get_ext_d2i.html">X509_get_ext_d2i(3)</a>, <a href="../man3/X509_get_extension_flags.html">X509_get_extension_flags(3)</a>, <a href="../man3/X509_get_pubkey.html">X509_get_pubkey(3)</a>, <a href="../man3/X509_get_subject_name.html">X509_get_subject_name(3)</a>, <a href="../man3/X509_get_version.html">X509_get_version(3)</a>, <a href="../man3/X509_NAME_add_entry_by_txt.html">X509_NAME_add_entry_by_txt(3)</a>, <a href="../man3/X509_NAME_ENTRY_get_object.html">X509_NAME_ENTRY_get_object(3)</a>, <a href="../man3/X509_NAME_get_index_by_NID.html">X509_NAME_get_index_by_NID(3)</a>, <a href="../man3/X509_NAME_print_ex.html">X509_NAME_print_ex(3)</a>, <a href="../man3/X509_new.html">X509_new(3)</a>, <a href="../man3/X509_sign.html">X509_sign(3)</a>, <a href="../man3/X509_verify_cert.html">X509_verify_cert(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). 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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