NAME

       ct - Certificate Transparency

SYNOPSIS

        #include <openssl/ct.h>

DESCRIPTION

       This library implements Certificate Transparency (CT) verification for TLS clients, as defined in RFC
       6962. This verification can provide some confidence that a certificate has been publicly logged in a set
       of CT logs.

       By default, these checks are disabled. They can be enabled using SSL_CTX_ct_enable() or SSL_ct_enable().

       This library can also be used to parse and examine CT data structures, such as Signed Certificate
       Timestamps (SCTs), or to read a list of CT logs. There are functions for: - decoding and encoding SCTs in
       DER and TLS wire format.  - printing SCTs.  - verifying the authenticity of SCTs.  - loading a CT log
       list from a CONF file.

SEE ALSO

       d2i_SCT_LIST(3), CTLOG_STORE_new(3), CTLOG_STORE_get0_log_by_id(3), SCT_new(3), SCT_print(3),
       SCT_validate(3), SCT_validate(3), CT_POLICY_EVAL_CTX_new(3), SSL_CTX_set_ct_validation_callback(3)

HISTORY

       This library was added in OpenSSL 1.1.0.

COPYRIGHT

       Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved.

       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
       <https://www.openssl.org/source/license.html>.

1.1.1                                              2023-05-24                                           CT(7SSL)