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<!-- INDEX BEGIN -->
<div name="index">
<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>
<ul>
<li><a href="#file_types">File Types</a></li>
<li><a href="#control_commands">Control Commands</a></li>
</ul>
<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>
<hr name="index" />
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<p>
</p>
<hr />
<h1><a name="name">NAME</a></h1>
<p>X509_LOOKUP, X509_LOOKUP_TYPE,
X509_LOOKUP_new, X509_LOOKUP_free, X509_LOOKUP_init,
X509_LOOKUP_shutdown,
X509_LOOKUP_set_method_data, X509_LOOKUP_get_method_data,
X509_LOOKUP_ctrl,
X509_LOOKUP_load_file, X509_LOOKUP_add_dir,
X509_LOOKUP_get_store, X509_LOOKUP_by_subject,
X509_LOOKUP_by_issuer_serial, X509_LOOKUP_by_fingerprint,
X509_LOOKUP_by_alias
- OpenSSL certificate lookup mechanisms</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/x509_vfy.h></pre>
<pre>
typedef x509_lookup_st X509_LOOKUP;</pre>
<pre>
typedef enum X509_LOOKUP_TYPE;</pre>
<pre>
X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method);
int X509_LOOKUP_init(X509_LOOKUP *ctx);
int X509_LOOKUP_shutdown(X509_LOOKUP *ctx);
void X509_LOOKUP_free(X509_LOOKUP *ctx);</pre>
<pre>
int X509_LOOKUP_set_method_data(X509_LOOKUP *ctx, void *data);
void *X509_LOOKUP_get_method_data(const X509_LOOKUP *ctx);</pre>
<pre>
int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc,
long argl, char **ret);
int X509_LOOKUP_load_file(X509_LOOKUP *ctx, char *name, long type);
int X509_LOOKUP_add_dir(X509_LOOKUP *ctx, char *name, long type);</pre>
<pre>
X509_STORE *X509_LOOKUP_get_store(const X509_LOOKUP *ctx);</pre>
<pre>
int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
X509_NAME *name, X509_OBJECT *ret);
int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
X509_NAME *name, ASN1_INTEGER *serial,
X509_OBJECT *ret);
int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
const unsigned char *bytes, int len,
X509_OBJECT *ret);
int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
const char *str, int len, X509_OBJECT *ret);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>The <strong>X509_LOOKUP</strong> structure holds the information needed to look up
certificates and CRLs according to an associated <em>X509_LOOKUP_METHOD(3)</em>.
Multiple <strong>X509_LOOKUP</strong> instances can be added to an <em>X509_STORE(3)</em>
to enable lookup in that store.</p>
<p>X509_LOOKUP_new() creates a new <strong>X509_LOOKUP</strong> using the given lookup
<em>method</em>.
It can also be created by calling <em>X509_STORE_add_lookup(3)</em>, which
will associate an <strong>X509_STORE</strong> with the lookup mechanism.</p>
<p>X509_LOOKUP_init() initializes the internal state and resources as
needed by the given <strong>X509_LOOKUP</strong> to do its work.</p>
<p>X509_LOOKUP_shutdown() tears down the internal state and resources of
the given <strong>X509_LOOKUP</strong>.</p>
<p>X509_LOOKUP_free() destructs the given <strong>X509_LOOKUP</strong>.</p>
<p>X509_LOOKUP_set_method_data() associates a pointer to application data
to the given <strong>X509_LOOKUP</strong>.</p>
<p>X509_LOOKUP_get_method_data() retrieves a pointer to application data
from the given <strong>X509_LOOKUP</strong>.</p>
<p>X509_LOOKUP_ctrl() is used to set or get additional data to or from an
<strong>X509_LOOKUP</strong> structure or its associated <em>X509_LOOKUP_METHOD(3)</em>.
The arguments of the control command are passed via <em>argc</em> and <em>argl</em>,
its return value via <em>*ret</em>.
The meaning of the arguments depends on the <em>cmd</em> number of the
control command. In general, this function is not called directly, but
wrapped by a macro call, see below.
The control <em>cmd</em>s known to OpenSSL are discussed in more depth
in <a href="#control_commands">Control Commands</a>.</p>
<p>X509_LOOKUP_load_file() passes a filename to be loaded immediately
into the associated <strong>X509_STORE</strong>.
<em>type</em> indicates what type of object is expected.
This can only be used with a lookup using the implementation
<em>X509_LOOKUP_file(3)</em>.</p>
<p>X509_LOOKUP_add_dir() passes a directory specification from which
certificates and CRLs are loaded on demand into the associated
<strong>X509_STORE</strong>.
<em>type</em> indicates what type of object is expected.
This can only be used with a lookup using the implementation
<em>X509_LOOKUP_hash_dir(3)</em>.</p>
<p>X509_LOOKUP_load_file(), X509_LOOKUP_add_dir(),
X509_LOOKUP_add_store(), and X509_LOOKUP_load_store() are implemented
as macros that use X509_LOOKUP_ctrl().</p>
<p>X509_LOOKUP_by_subject(), X509_LOOKUP_by_issuer_serial(),
X509_LOOKUP_by_fingerprint(), and X509_LOOKUP_by_alias() look up
certificates and CRLs in the <em>X509_STORE(3)</em> associated with the
<strong>X509_LOOKUP</strong> using different criteria, where the looked up object is
stored in <em>ret</em>.
Some of the underlying <strong>X509_LOOKUP_METHOD</strong>s will also cache objects
matching the criteria in the associated <strong>X509_STORE</strong>, which makes it
possible to handle cases where the criteria have more than one hit.</p>
<p>
</p>
<h2><a name="file_types">File Types</a></h2>
<p>X509_LOOKUP_load_file() and X509_LOOKUP_add_dir() take a <em>type</em>,
which can be one of the following:</p>
<dl>
<dt><strong><a name="x509_filetype_pem" class="item"><strong>X509_FILETYPE_PEM</strong></a></strong></dt>
<dd>
<p>The file or files that are loaded are expected to be in PEM format.</p>
</dd>
<dt><strong><a name="x509_filetype_asn1" class="item"><strong>X509_FILETYPE_ASN1</strong></a></strong></dt>
<dd>
<p>The file or files that are loaded are expected to be in raw DER format.</p>
</dd>
<dt><strong><a name="x509_filetype_default" class="item"><strong>X509_FILETYPE_DEFAULT</strong></a></strong></dt>
<dd>
<p>The default certificate file or directory is used. In this case,
<em>name</em> is ignored.</p>
</dd>
</dl>
<p>
</p>
<h2><a name="control_commands">Control Commands</a></h2>
<p>The <strong>X509_LOOKUP_METHOD</strong>s built into OpenSSL recognise the following
X509_LOOKUP_ctrl() <em>cmd</em>s:</p>
<dl>
<dt><strong><a name="x509_l_file_load" class="item"><strong>X509_L_FILE_LOAD</strong></a></strong></dt>
<dd>
<p>This is the command that X509_LOOKUP_load_file() uses.
The filename is passed in <em>argc</em>, and the type in <em>argl</em>.</p>
</dd>
<dt><strong><a name="x509_l_add_dir" class="item"><strong>X509_L_ADD_DIR</strong></a></strong></dt>
<dd>
<p>This is the command that X509_LOOKUP_add_dir() uses.
The directory specification is passed in <em>argc</em>, and the type in
<em>argl</em>.</p>
</dd>
<dt><strong><a name="x509_l_add_store" class="item"><strong>X509_L_ADD_STORE</strong></a></strong></dt>
<dd>
<p>This is the command that X509_LOOKUP_add_store() uses.
The URI is passed in <em>argc</em>.</p>
</dd>
<dt><strong><a name="x509_l_load_store" class="item"><strong>X509_L_LOAD_STORE</strong></a></strong></dt>
<dd>
<p>This is the command that X509_LOOKUP_load_store() uses.
The URI is passed in <em>argc</em>.</p>
</dd>
</dl>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p>X509_LOOKUP_new() returns an <strong>X509_LOOKUP</strong> pointer when successful,
or NULL on error.</p>
<p>X509_LOOKUP_init() and X509_LOOKUP_shutdown() return 1 on success, or
0 on error.</p>
<p>X509_LOOKUP_ctrl() returns -1 if the <strong>X509_LOOKUP</strong> doesn't have an
associated <strong>X509_LOOKUP_METHOD</strong>, or 1 if the
doesn't have a control function.
Otherwise, it returns what the control function in the
<strong>X509_LOOKUP_METHOD</strong> returns, which is usually 1 on success and 0 in
error.</p>
<p>X509_LOOKUP_get_store() returns an <strong>X509_STORE</strong> pointer if there is
one, otherwise NULL.</p>
<p>X509_LOOKUP_by_subject(), X509_LOOKUP_by_issuer_serial(),
X509_LOOKUP_by_fingerprint(), and X509_LOOKUP_by_alias() all return 0
if there is no <strong>X509_LOOKUP_METHOD</strong> or that method doesn't implement
the corresponding function.
Otherwise, it returns what the corresponding function in the
<strong>X509_LOOKUP_METHOD</strong> returns, which is usually 1 on success and 0 in
error.</p>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>X509_LOOKUP_METHOD(3)</em>, <em>X509_STORE(3)</em></p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>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
<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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