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=pod

=head1 NAME

ct - Certificate Transparency

=head1 SYNOPSIS

 #include <openssl/ct.h>

=head1 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
L<SSL_CTX_enable_ct(3)> or L<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.

=head1 SEE ALSO

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

=head1 HISTORY

The ct library was added in OpenSSL 1.1.0.

=head1 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
L<https://www.openssl.org/source/license.html>.

=cut