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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="#BUGS">BUGS</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_STORE_CTX_new, X509_STORE_CTX_cleanup, X509_STORE_CTX_free, X509_STORE_CTX_init, X509_STORE_CTX_set0_trusted_stack, X509_STORE_CTX_set_cert, X509_STORE_CTX_set0_crls, X509_STORE_CTX_get0_chain, X509_STORE_CTX_set0_verified_chain, X509_STORE_CTX_get0_param, X509_STORE_CTX_set0_param, X509_STORE_CTX_get0_untrusted, X509_STORE_CTX_set0_untrusted, X509_STORE_CTX_get_num_untrusted, X509_STORE_CTX_set_default, X509_STORE_CTX_set_verify, X509_STORE_CTX_verify_fn - X509_STORE_CTX initialisation</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/x509_vfy.h>
X509_STORE_CTX *X509_STORE_CTX_new(void);
void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx);
void X509_STORE_CTX_free(X509_STORE_CTX *ctx);
int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store,
X509 *x509, STACK_OF(X509) *chain);
void X509_STORE_CTX_set0_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x);
STACK_OF(X509) *X509_STORE_CTX_get0_chain(X509_STORE_CTX *ctx);
void X509_STORE_CTX_set0_verified_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *chain);
void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk);
X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx);
void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param);
int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name);
STACK_OF(X509)* X509_STORE_CTX_get0_untrusted(X509_STORE_CTX *ctx);
void X509_STORE_CTX_set0_untrusted(X509_STORE_CTX *ctx, STACK_OF(X509) *sk);
int X509_STORE_CTX_get_num_untrusted(X509_STORE_CTX *ctx);
typedef int (*X509_STORE_CTX_verify_fn)(X509_STORE_CTX *);
void X509_STORE_CTX_set_verify(X509_STORE_CTX *ctx, X509_STORE_CTX_verify_fn verify);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>These functions initialise an <b>X509_STORE_CTX</b> structure for subsequent use by X509_verify_cert().</p>
<p>X509_STORE_CTX_new() returns a newly initialised <b>X509_STORE_CTX</b> structure.</p>
<p>X509_STORE_CTX_cleanup() internally cleans up an <b>X509_STORE_CTX</b> structure. The context can then be reused with a new call to X509_STORE_CTX_init().</p>
<p>X509_STORE_CTX_free() completely frees up <b>ctx</b>. After this call <b>ctx</b> is no longer valid. If <b>ctx</b> is NULL nothing is done.</p>
<p>X509_STORE_CTX_init() sets up <b>ctx</b> for a subsequent verification operation. It must be called before each call to X509_verify_cert(), i.e. a <b>ctx</b> is only good for one call to X509_verify_cert(); if you want to verify a second certificate with the same <b>ctx</b> then you must call X509_STORE_CTX_cleanup() and then X509_STORE_CTX_init() again before the second call to X509_verify_cert(). The trusted certificate store is set to <b>store</b>, the end entity certificate to be verified is set to <b>x509</b> and a set of additional certificates (which will be untrusted but may be used to build the chain) in <b>chain</b>. Any or all of the <b>store</b>, <b>x509</b> and <b>chain</b> parameters can be <b>NULL</b>.</p>
<p>X509_STORE_CTX_set0_trusted_stack() sets the set of trusted certificates of <b>ctx</b> to <b>sk</b>. This is an alternative way of specifying trusted certificates instead of using an <b>X509_STORE</b>.</p>
<p>X509_STORE_CTX_set_cert() sets the certificate to be verified in <b>ctx</b> to <b>x</b>.</p>
<p>X509_STORE_CTX_set0_verified_chain() sets the validated chain used by <b>ctx</b> to be <b>chain</b>. Ownership of the chain is transferred to <b>ctx</b> and should not be free'd by the caller. X509_STORE_CTX_get0_chain() returns the internal pointer used by the <b>ctx</b> that contains the validated chain.</p>
<p>X509_STORE_CTX_set0_crls() sets a set of CRLs to use to aid certificate verification to <b>sk</b>. These CRLs will only be used if CRL verification is enabled in the associated <b>X509_VERIFY_PARAM</b> structure. This might be used where additional "useful" CRLs are supplied as part of a protocol, for example in a PKCS#7 structure.</p>
<p>X509_STORE_CTX_get0_param() retrieves an internal pointer to the verification parameters associated with <b>ctx</b>.</p>
<p>X509_STORE_CTX_get0_untrusted() retrieves an internal pointer to the stack of untrusted certificates associated with <b>ctx</b>.</p>
<p>X509_STORE_CTX_set0_untrusted() sets the internal point to the stack of untrusted certificates associated with <b>ctx</b> to <b>sk</b>.</p>
<p>X509_STORE_CTX_set0_param() sets the internal verification parameter pointer to <b>param</b>. After this call <b>param</b> should not be used.</p>
<p>X509_STORE_CTX_set_default() looks up and sets the default verification method to <b>name</b>. This uses the function X509_VERIFY_PARAM_lookup() to find an appropriate set of parameters from <b>name</b>.</p>
<p>X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates that were used in building the chain following a call to X509_verify_cert().</p>
<p>X509_STORE_CTX_set_verify() provides the capability for overriding the default verify function. This function is responsible for verifying chain signatures and expiration times.</p>
<p>A verify function is defined as an X509_STORE_CTX_verify type which has the following signature:</p>
<pre><code> int (*verify)(X509_STORE_CTX *);</code></pre>
<p>This function should receive the current X509_STORE_CTX as a parameter and return 1 on success or 0 on failure.</p>
<h1 id="NOTES">NOTES</h1>
<p>The certificates and CRLs in a store are used internally and should <b>not</b> be freed up until after the associated <b>X509_STORE_CTX</b> is freed.</p>
<h1 id="BUGS">BUGS</h1>
<p>The certificates and CRLs in a context are used internally and should <b>not</b> be freed up until after the associated <b>X509_STORE_CTX</b> is freed. Copies should be made or reference counts increased instead.</p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>X509_STORE_CTX_new() returns a newly allocated context or <b>NULL</b> if an error occurred.</p>
<p>X509_STORE_CTX_init() returns 1 for success or 0 if an error occurred.</p>
<p>X509_STORE_CTX_get0_param() returns a pointer to an <b>X509_VERIFY_PARAM</b> structure or <b>NULL</b> if an error occurred.</p>
<p>X509_STORE_CTX_cleanup(), X509_STORE_CTX_free(), X509_STORE_CTX_set0_trusted_stack(), X509_STORE_CTX_set_cert(), X509_STORE_CTX_set0_crls() and X509_STORE_CTX_set0_param() do not return values.</p>
<p>X509_STORE_CTX_set_default() returns 1 for success or 0 if an error occurred.</p>
<p>X509_STORE_CTX_get_num_untrusted() returns the number of untrusted certificates used.</p>
<h1 id="SEE-ALSO">SEE ALSO</h1>
<p><a href="../man3/X509_verify_cert.html">X509_verify_cert(3)</a> <a href="../man3/X509_VERIFY_PARAM_set_flags.html">X509_VERIFY_PARAM_set_flags(3)</a></p>
<h1 id="HISTORY">HISTORY</h1>
<p>The X509_STORE_CTX_set0_crls() function was added in OpenSSL 1.0.0. The X509_STORE_CTX_get_num_untrusted() function was added in OpenSSL 1.1.0.</p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2009-2020 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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