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.IX Title &quot;CT 7&quot;
.TH CT 7 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
ct \- Certificate Transparency
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/ct.h&gt;
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
This library implements Certificate Transparency (\s-1CT\s0) verification for \s-1TLS\s0
clients, as defined in \s-1RFC 6962.\s0 This verification can provide some confidence
that a certificate has been publicly logged in a set of \s-1CT\s0 logs.
.PP
By default, these checks are disabled. They can be enabled using
\&amp;\fBSSL_CTX_enable_ct\fR\|(3) or \fBSSL_enable_ct\fR\|(3).
.PP
This library can also be used to parse and examine \s-1CT\s0 data structures, such as
Signed Certificate Timestamps (SCTs), or to read a list of \s-1CT\s0 logs. There are
functions for:
\&amp;\- decoding and encoding SCTs in \s-1DER\s0 and \s-1TLS\s0 wire format.
\&amp;\- printing SCTs.
\&amp;\- verifying the authenticity of SCTs.
\&amp;\- loading a \s-1CT\s0 log list from a \s-1CONF\s0 file.
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBd2i_SCT_LIST\fR\|(3),
\&amp;\fBCTLOG_STORE_new\fR\|(3),
\&amp;\fBCTLOG_STORE_get0_log_by_id\fR\|(3),
\&amp;\fBSCT_new\fR\|(3),
\&amp;\fBSCT_print\fR\|(3),
\&amp;\fBSCT_validate\fR\|(3),
\&amp;\fBSCT_validate\fR\|(3),
\&amp;\fBCT_POLICY_EVAL_CTX_new\fR\|(3),
\&amp;\fBSSL_CTX_set_ct_validation_callback\fR\|(3)
.SH &quot;HISTORY&quot;
.IX Header &quot;HISTORY&quot;
The ct library was added in OpenSSL 1.1.0.
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2016\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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