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<title>SSL_load_client_CA_file</title>
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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="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</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>SSL_load_client_CA_file, SSL_add_file_cert_subjects_to_stack, SSL_add_dir_cert_subjects_to_stack - load certificate names</p>

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

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

 STACK_OF(X509_NAME) *SSL_load_client_CA_file(const char *file);

 int SSL_add_file_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                         const char *file)
 int SSL_add_dir_cert_subjects_to_stack(STACK_OF(X509_NAME) *stack,
                                        const char *dir)</code></pre>

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

<p>SSL_load_client_CA_file() reads certificates from <i>file</i> and returns a STACK_OF(X509_NAME) with the subject names found.</p>

<p>SSL_add_file_cert_subjects_to_stack() reads certificates from <i>file</i>, and adds their subject name to the already existing <i>stack</i>.</p>

<p>SSL_add_dir_cert_subjects_to_stack() reads certificates from every file in the directory <i>dir</i>, and adds their subject name to the already existing <i>stack</i>.</p>

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

<p>SSL_load_client_CA_file() reads a file of PEM formatted certificates and extracts the X509_NAMES of the certificates found. While the name suggests the specific usage as support function for <a href="../man3/SSL_CTX_set_client_CA_list.html">SSL_CTX_set_client_CA_list(3)</a>, it is not limited to CA certificates.</p>

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

<p>The following return values can occur:</p>

<dl>

<dt id="NULL">NULL</dt>
<dd>

<p>The operation failed, check out the error stack for the reason.</p>

</dd>
<dt id="Pointer-to-STACK_OF-X509_NAME">Pointer to STACK_OF(X509_NAME)</dt>
<dd>

<p>Pointer to the subject names of the successfully read certificates.</p>

</dd>
</dl>

<h1 id="EXAMPLES">EXAMPLES</h1>

<p>Load names of CAs from file and use it as a client CA list:</p>

<pre><code> SSL_CTX *ctx;
 STACK_OF(X509_NAME) *cert_names;

 ...
 cert_names = SSL_load_client_CA_file(&quot;/path/to/CAfile.pem&quot;);
 if (cert_names != NULL)
     SSL_CTX_set_client_CA_list(ctx, cert_names);
 else
     /* error */
 ...</code></pre>

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

<p><a href="../man7/ssl.html">ssl(7)</a>, <a href="../man3/SSL_CTX_set_client_CA_list.html">SSL_CTX_set_client_CA_list(3)</a></p>

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

<p>Copyright 2000-2019 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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