Updated: 2022/Sep/29

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CT(7)                               OpenSSL                              CT(7)



NAME
       ct - Certificate Transparency

LIBRARY
       libcrypto, -lcrypto

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_enable_ct(3) or SSL_enable_ct(3).

       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
       The ct library was added in OpenSSL 1.1.0.

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

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



3.0.12                            2023-05-07                             CT(7)