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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="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

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

<p>X509_LOOKUP_METHOD, X509_LOOKUP_meth_new, X509_LOOKUP_meth_free, X509_LOOKUP_meth_set_new_item, X509_LOOKUP_meth_get_new_item, X509_LOOKUP_meth_set_free, X509_LOOKUP_meth_get_free, X509_LOOKUP_meth_set_init, X509_LOOKUP_meth_get_init, X509_LOOKUP_meth_set_shutdown, X509_LOOKUP_meth_get_shutdown, X509_LOOKUP_ctrl_fn, X509_LOOKUP_meth_set_ctrl, X509_LOOKUP_meth_get_ctrl, X509_LOOKUP_get_by_subject_fn, X509_LOOKUP_meth_set_get_by_subject, X509_LOOKUP_meth_get_get_by_subject, X509_LOOKUP_get_by_issuer_serial_fn, X509_LOOKUP_meth_set_get_by_issuer_serial, X509_LOOKUP_meth_get_get_by_issuer_serial, X509_LOOKUP_get_by_fingerprint_fn, X509_LOOKUP_meth_set_get_by_fingerprint, X509_LOOKUP_meth_get_get_by_fingerprint, X509_LOOKUP_get_by_alias_fn, X509_LOOKUP_meth_set_get_by_alias, X509_LOOKUP_meth_get_get_by_alias, X509_OBJECT_set1_X509, X509_OBJECT_set1_X509_CRL - Routines to build up X509_LOOKUP methods</p>

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

<pre><code> #include &lt;openssl/x509_vfy.h&gt;

 typedef x509_lookup_method_st X509_LOOKUP_METHOD;

 X509_LOOKUP_METHOD *X509_LOOKUP_meth_new(const char *name);
 void X509_LOOKUP_meth_free(X509_LOOKUP_METHOD *method);

 int X509_LOOKUP_meth_set_new_item(X509_LOOKUP_METHOD *method,
                                   int (*new_item) (X509_LOOKUP *ctx));
 int (*X509_LOOKUP_meth_get_new_item(const X509_LOOKUP_METHOD* method))
     (X509_LOOKUP *ctx);

 int X509_LOOKUP_meth_set_free(X509_LOOKUP_METHOD *method,
                               void (*free) (X509_LOOKUP *ctx));
 void (*X509_LOOKUP_meth_get_free(const X509_LOOKUP_METHOD* method))
     (X509_LOOKUP *ctx);

 int X509_LOOKUP_meth_set_init(X509_LOOKUP_METHOD *method,
                               int (*init) (X509_LOOKUP *ctx));
 int (*X509_LOOKUP_meth_get_init(const X509_LOOKUP_METHOD* method))
     (X509_LOOKUP *ctx);

 int X509_LOOKUP_meth_set_shutdown(X509_LOOKUP_METHOD *method,
                                   int (*shutdown) (X509_LOOKUP *ctx));
 int (*X509_LOOKUP_meth_get_shutdown(const X509_LOOKUP_METHOD* method))
     (X509_LOOKUP *ctx);

 typedef int (*X509_LOOKUP_ctrl_fn)(X509_LOOKUP *ctx, int cmd, const char *argc,
                                    long argl, char **ret);
 int X509_LOOKUP_meth_set_ctrl(X509_LOOKUP_METHOD *method,
     X509_LOOKUP_ctrl_fn ctrl_fn);
 X509_LOOKUP_ctrl_fn X509_LOOKUP_meth_get_ctrl(const X509_LOOKUP_METHOD *method);

 typedef int (*X509_LOOKUP_get_by_subject_fn)(X509_LOOKUP *ctx,
                                              X509_LOOKUP_TYPE type,
                                              X509_NAME *name,
                                              X509_OBJECT *ret);
 int X509_LOOKUP_meth_set_get_by_subject(X509_LOOKUP_METHOD *method,
     X509_LOOKUP_get_by_subject_fn fn);
 X509_LOOKUP_get_by_subject_fn X509_LOOKUP_meth_get_get_by_subject(
     const X509_LOOKUP_METHOD *method);

 typedef int (*X509_LOOKUP_get_by_issuer_serial_fn)(X509_LOOKUP *ctx,
                                                    X509_LOOKUP_TYPE type,
                                                    X509_NAME *name,
                                                    ASN1_INTEGER *serial,
                                                    X509_OBJECT *ret);
 int X509_LOOKUP_meth_set_get_by_issuer_serial(
     X509_LOOKUP_METHOD *method, X509_LOOKUP_get_by_issuer_serial_fn fn);
 X509_LOOKUP_get_by_issuer_serial_fn X509_LOOKUP_meth_get_get_by_issuer_serial(
     const X509_LOOKUP_METHOD *method);

 typedef int (*X509_LOOKUP_get_by_fingerprint_fn)(X509_LOOKUP *ctx,
                                                  X509_LOOKUP_TYPE type,
                                                  const unsigned char* bytes,
                                                  int len,
                                                  X509_OBJECT *ret);
 int X509_LOOKUP_meth_set_get_by_fingerprint(X509_LOOKUP_METHOD *method,
     X509_LOOKUP_get_by_fingerprint_fn fn);
 X509_LOOKUP_get_by_fingerprint_fn X509_LOOKUP_meth_get_get_by_fingerprint(
     const X509_LOOKUP_METHOD *method);

 typedef int (*X509_LOOKUP_get_by_alias_fn)(X509_LOOKUP *ctx,
                                            X509_LOOKUP_TYPE type,
                                            const char *str,
                                            int len,
                                            X509_OBJECT *ret);
 int X509_LOOKUP_meth_set_get_by_alias(X509_LOOKUP_METHOD *method,
     X509_LOOKUP_get_by_alias_fn fn);
 X509_LOOKUP_get_by_alias_fn X509_LOOKUP_meth_get_get_by_alias(
     const X509_LOOKUP_METHOD *method);

 int X509_OBJECT_set1_X509(X509_OBJECT *a, X509 *obj);
 int X509_OBJECT_set1_X509_CRL(X509_OBJECT *a, X509_CRL *obj);</code></pre>

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

<p>The <b>X509_LOOKUP_METHOD</b> type is a structure used for the implementation of new X509_LOOKUP types. It provides a set of functions used by OpenSSL for the implementation of various X509 and X509_CRL lookup capabilities. One instance of an X509_LOOKUP_METHOD can be associated to many instantiations of an <b>X509_LOOKUP</b> structure.</p>

<p>X509_LOOKUP_meth_new() creates a new <b>X509_LOOKUP_METHOD</b> structure. It should be given a human-readable string containing a brief description of the lookup method.</p>

<p>X509_LOOKUP_meth_free() destroys a <b>X509_LOOKUP_METHOD</b> structure.</p>

<p>X509_LOOKUP_get_new_item() and X509_LOOKUP_set_new_item() get and set the function that is called when an <b>X509_LOOKUP</b> object is created with X509_LOOKUP_new(). If an X509_LOOKUP_METHOD requires any per-X509_LOOKUP specific data, the supplied new_item function should allocate this data and invoke <a href="../man3/X509_LOOKUP_set_method_data.html">X509_LOOKUP_set_method_data(3)</a>.</p>

<p>X509_LOOKUP_get_free() and X509_LOOKUP_set_free() get and set the function that is used to free any method data that was allocated and set from within new_item function.</p>

<p>X509_LOOKUP_meth_get_init() and X509_LOOKUP_meth_set_init() get and set the function that is used to initialize the method data that was set with <a href="../man3/X509_LOOKUP_set_method_data.html">X509_LOOKUP_set_method_data(3)</a> as part of the new_item routine.</p>

<p>X509_LOOKUP_meth_get_shutdown() and X509_LOOKUP_meth_set_shutdown() get and set the function that is used to shut down the method data whose state was previously initialized in the init function.</p>

<p>X509_LOOKUP_meth_get_ctrl() and X509_LOOKUP_meth_set_ctrl() get and set a function to be used to handle arbitrary control commands issued by X509_LOOKUP_ctrl(). The control function is given the X509_LOOKUP <b>ctx</b>, along with the arguments passed by X509_LOOKUP_ctrl. <b>cmd</b> is an arbitrary integer that defines some operation. <b>argc</b> is a pointer to an array of characters. <b>argl</b> is an integer. <b>ret</b>, if set, points to a location where any return data should be written to. How <b>argc</b> and <b>argl</b> are used depends entirely on the control function.</p>

<p>X509_LOOKUP_set_get_by_subject(), X509_LOOKUP_set_get_by_issuer_serial(), X509_LOOKUP_set_get_by_fingerprint(), X509_LOOKUP_set_get_by_alias() set the functions used to retrieve an X509 or X509_CRL object by the object&#39;s subject, issuer, fingerprint, and alias respectively. These functions are given the X509_LOOKUP context, the type of the X509_OBJECT being requested, parameters related to the lookup, and an X509_OBJECT that will receive the requested object.</p>

<p>Implementations must add objects they find to the <b>X509_STORE</b> object using X509_STORE_add_cert() or X509_STORE_add_crl(). This increments its reference count. However, the X509_STORE_CTX_get_by_subject() function also increases the reference count which leads to one too many references being held. Therefore, applications should additionally call X509_free() or X509_CRL_free() to decrement the reference count again.</p>

<p>Implementations should also use either X509_OBJECT_set1_X509() or X509_OBJECT_set1_X509_CRL() to set the result. Note that this also increments the result&#39;s reference count.</p>

<p>Any method data that was created as a result of the new_item function set by X509_LOOKUP_meth_set_new_item() can be accessed with <a href="../man3/X509_LOOKUP_get_method_data.html">X509_LOOKUP_get_method_data(3)</a>. The <b>X509_STORE</b> object that owns the X509_LOOKUP may be accessed with <a href="../man3/X509_LOOKUP_get_store.html">X509_LOOKUP_get_store(3)</a>. Successful lookups should return 1, and unsuccessful lookups should return 0.</p>

<p>X509_LOOKUP_get_get_by_subject(), X509_LOOKUP_get_get_by_issuer_serial(), X509_LOOKUP_get_get_by_fingerprint(), X509_LOOKUP_get_get_by_alias() retrieve the function set by the corresponding setter.</p>

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

<p>The <b>X509_LOOKUP_meth_set</b> functions return 1 on success or 0 on error.</p>

<p>The <b>X509_LOOKUP_meth_get</b> functions return the corresponding function pointers.</p>

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

<p><a href="../man3/X509_STORE_new.html">X509_STORE_new(3)</a>, <a href="../man3/SSL_CTX_set_cert_store.html">SSL_CTX_set_cert_store(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>The functions described here were added in OpenSSL 1.1.0i.</p>

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

<p>Copyright 2018-2020 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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