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README(7)        BSD Miscellaneous Information Manual        README(7)

NAME
     LibreTLS -- libtls for OpenSSL

DESCRIPTION
     LibreTLS is a port of libtls from LibreSSL to OpenSSL.  libtls:
           https://man.openbsd.org/tls_init.3
     is ``a new TLS library, designed to make it easier to write
     foolproof applications''.

     libtls provides an excellent new API, but LibreSSL can be diffi-
     cult to install on systems which already use OpenSSL.  LibreTLS
     aims to make the libtls API more easily and widely available.

   Releases
     LibreTLS is based on LibreSSL-portable:
           https://www.libressl.org/releases.html
     sources.  LibreTLS releases track LibreSSL releases, starting
     with version 3.2.0.  If patches must be released between LibreSSL
     releases, the letter `p' followed by an increasing digit starting
     from 1 will be added to the version number.

     LibreTLS release tarballs are available from .:
           https://causal.agency/libretls/

   Compatibility
     The libtls provided by LibreTLS is ABI-compatible with the libtls
     provided by the corresponding LibreSSL release.

     The behaviour of LibreTLS and LibreSSL differs in how the root
     certificates are loaded by default.  LibreSSL uses a hardcoded
     path to a CA bundle file, while LibreTLS uses the default CA
     locations of OpenSSL, which may include a CA directory.  To
     restore the behaviour of LibreSSL, call tls_config_set_ca_file(3)
     with the path returned by tls_default_ca_cert_file(3).  All other
     behaviour should be identical.

     LibreTLS targets the OpenSSL 1.1.1 series.  Due to a bug in
     OpenSSL, only versions 1.1.1b and newer are known to work.
     LibreTLS is compatible with OpenSSL 3.0.0 but hasn't been ported
     away from deprecated APIs.

   Platform Support
     LibreTLS should work on the same platforms as LibreSSL-portable:
           https://www.libressl.org/releases.html,
     though it has not been thoroughly tested on platforms other than
     Linux, FreeBSD and macOS.

   License
     libtls consists of all new code developed as part of OpenBSD
     under OpenBSD's preferred license:
           https://www.openbsd.org/policy.html
     of ISC.  Some compat sources are under the 3-clause BSD license
     or the MIT license.

     LibreTLS is not encumbered by the dual-licensing of OpenSSL under
     both the OpenSSL license and the original SSLeay license, which
     are incompatible with the GNU General Public License.  When
     OpenSSL 3.0 is released under the Apache 2.0 license, software
     under the GPLv3 will be able to link against LibreTLS and OpenSSL
     without additional permissions.

INSTALLING
     To install from a release tarball, run the following:

           ./configure
           make all
           make install

     To install from a git checkout, autoconf, automake and libtool
     are required.  Run the following before continuing with the steps
     above:

           autoreconf -fi

AUTHORS
     LibreTLS is maintained by June McEnroe <june@causal.agency>.

     LibreSSL is developed by The OpenBSD project:
     https://www.openbsd.org.

Causal Agency              February 27, 2022             Causal Agency