Added Cyg-Win

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Authors
=======
This is the list of OpenSSL authors for copyright purposes.
It does not necessarily list everyone who has contributed code,
since in some cases, their employer may be the copyright holder.
To see the full list of contributors, see the revision history in
source control.
Groups
------
* OpenSSL Software Services, Inc.
* OpenSSL Software Foundation, Inc.
* Google LLC
Individuals
-----------
* Andy Polyakov
* Ben Laurie
* Ben Kaduk
* Bernd Edlinger
* Bodo Möller
* David Benjamin
* David von Oheimb
* Dmitry Belyavskiy (Дмитрий Белявский)
* Emilia Käsper
* Eric Young
* Geoff Thorpe
* Holger Reif
* Kurt Roeckx
* Lutz Jänicke
* Mark J. Cox
* Matt Caswell
* Matthias St. Pierre
* Nicola Tuveri
* Nils Larsch
* Patrick Steuer
* Paul Dale
* Paul C. Sutton
* Paul Yang
* Ralf S. Engelschall
* Rich Salz
* Richard Levitte
* Shane Lontis
* Stephen Henson
* Steve Marquess
* Tim Hudson
* Tomáš Mráz
* Ulf Möller
* Valerii Krygin
* Viktor Dukhovni

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MODIFYING OPENSSL SOURCE
========================
This document describes the way to add custom modifications to OpenSSL
sources.
If you are adding new C source files
------------------------------------
Please update the `build.info` files in the directories where you placed the
C source files, to include a line like this for each new C source file:
- In `crypto/` or any of its subdirectories (intended for `libcrypto`):
SOURCE[../libcrypto]={name-of-C-source-file}
- In `ssl/` or any of its subdirectories (intended for `libssl`):
SOURCE[../libssl]={name-of-C-source-file}
Do note that the path given as the `SOURCE` attribute must be adapted
appropriately for the location of the `build.info` file, as it's a relative
path to where the library itself is built, for example:
- For `crypto/build.info`, the library path should be `../libcrypto`
- For `crypto/evp/build.info`, the library path should be
`../../libcrypto`
- For `ssl/build.info`, the library path should be `../libssl`
- For `ssl/quic/build.info`, the library path should be `../../libssl`
To know more about `build.info` files, please read [doc/internal/man7/build.info.pod].
For better viewing, consider converting it to HTML or PDF using `pod2html`
or `pod2pdf`.
Adding new public functions
---------------------------
If you are adding new public functions to the custom library build, you need to
either add a prototype in one of the existing OpenSSL header files, or
provide a new header file and edit.
Only headers in the `include/openssl` subdirectory are considered for public
functions. If you're creating a new header file, it must be located in that
directory.
Functions declared in `include/openssl` header files are assumed to be part
of the `libcrypto` library unless specified otherwise. *If your new
functions are meant for the `libssl` library*, you will need to edit
[Configurations/unix-Makefile.tmpl] and add the header file name in the
array `my @sslheaders_tmpl`.
Updating OpenSSL's bookkeeping files
------------------------------------
OpenSSL has a few bookkeeping files to keep track of exposed functions, most
importantly `util/libcrypto.num` and `util/libssl.num`. Any time a new
public function - as defined above - is added, these files must be updated.
To make such an update, please do the following:
./Configure -Werror --strict-warnings [your-options]
make update
If you plan to submit the changes you made to OpenSSL (see
[CONTRIBUTING.md]), it's also worth running the following after running
`make update`, to ensure that documentation has correct format.
make doc-nits
Do note that `make update` also generates files related to OIDs (in the
`crypto/objects/` folder) and errors messages.
If a git merge error occurs in one of these generated files, then the
generated files need to be removed and regenerated using `make update`.
To aid in this process, the generated files can be committed separately
so they can be removed easily by reverting that commit.
[doc/internal/man7/build.info.pod]: ./doc/internal/man7/build.info.pod
[Configurations/unix-Makefile.tmpl]: ./Configurations/unix-Makefile.tmpl
[CONTRIBUTING.md]: ./CONTRIBUTING.md

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Welcome to the OpenSSL Project
==============================
[![openssl logo]][www.openssl.org]
[![github actions ci badge]][github actions ci]
![Nightly OS Zoo ci badge](https://github.com/openssl/openssl/actions/workflows/os-zoo.yml/badge.svg)
![Provider Compatibility](https://github.com/openssl/openssl/actions/workflows/provider-compatibility.yml/badge.svg)
![Quic Interop](https://github.com/openssl/openssl/actions/workflows/run_quic_interop.yml/badge.svg)
![Daily checks](https://github.com/openssl/openssl/actions/workflows/run-checker-daily.yml/badge.svg)
OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit
for the TLS (formerly SSL), DTLS and QUIC protocols.
The protocol implementations are based on a full-strength general purpose
cryptographic library, which can also be used stand-alone. Also included is a
cryptographic module validated to conform with FIPS standards.
OpenSSL is descended from the SSLeay library developed by Eric A. Young
and Tim J. Hudson.
The official Home Page of the OpenSSL Project is [www.openssl.org].
Table of Contents
=================
- [Overview](#overview)
- [Download](#download)
- [Build and Install](#build-and-install)
- [Documentation](#documentation)
- [License](#license)
- [Support](#support)
- [Contributing](#contributing)
- [Legalities](#legalities)
Overview
========
The OpenSSL toolkit includes:
- **libssl**
an implementation of all TLS protocol versions up to TLSv1.3 ([RFC 8446]),
DTLS protocol versions up to DTLSv1.2 ([RFC 6347]) and
the QUIC version 1 protocol ([RFC 9000]).
- **libcrypto**
a full-strength general purpose cryptographic library. It constitutes the
basis of the TLS implementation, but can also be used independently.
- **openssl**
the OpenSSL command line tool, a swiss army knife for cryptographic tasks,
testing and analyzing. It can be used for
- creation of key parameters
- creation of X.509 certificates, CSRs and CRLs
- calculation of message digests
- encryption and decryption
- SSL/TLS/DTLS and client and server tests
- QUIC client tests
- handling of S/MIME signed or encrypted mail
- and more...
Download
========
For Production Use
------------------
Source code tarballs of the official releases can be downloaded from
[openssl-library.org/source/](https://openssl-library.org/source/).
The OpenSSL project does not distribute the toolkit in binary form.
However, for a large variety of operating systems precompiled versions
of the OpenSSL toolkit are available. In particular, on Linux and other
Unix operating systems, it is normally recommended to link against the
precompiled shared libraries provided by the distributor or vendor.
We also maintain a list of third parties that produce OpenSSL binaries for
various Operating Systems (including Windows) on the [Binaries] page on our
wiki.
For Testing and Development
---------------------------
Although testing and development could in theory also be done using
the source tarballs, having a local copy of the git repository with
the entire project history gives you much more insight into the
code base.
The main OpenSSL Git repository is private.
There is a public GitHub mirror of it at [github.com/openssl/openssl],
which is updated automatically from the former on every commit.
A local copy of the Git repository can be obtained by cloning it from
the GitHub mirror using
git clone https://github.com/openssl/openssl.git
If you intend to contribute to OpenSSL, either to fix bugs or contribute
new features, you need to fork the GitHub mirror and clone your public fork
instead.
git clone https://github.com/yourname/openssl.git
This is necessary because all development of OpenSSL nowadays is done via
GitHub pull requests. For more details, see [Contributing](#contributing).
Build and Install
=================
After obtaining the Source, have a look at the [INSTALL](INSTALL.md) file for
detailed instructions about building and installing OpenSSL. For some
platforms, the installation instructions are amended by a platform specific
document.
* [Notes for UNIX-like platforms](NOTES-UNIX.md)
* [Notes for Android platforms](NOTES-ANDROID.md)
* [Notes for Windows platforms](NOTES-WINDOWS.md)
* [Notes for the DOS platform with DJGPP](NOTES-DJGPP.md)
* [Notes for the OpenVMS platform](NOTES-VMS.md)
* [Notes on Perl](NOTES-PERL.md)
* [Notes on Valgrind](NOTES-VALGRIND.md)
Specific notes on upgrading to OpenSSL 3.x from previous versions can be found
in the [ossl-guide-migration(7ossl)] manual page.
Documentation
=============
README Files
------------
There are some README.md files in the top level of the source distribution
containing additional information on specific topics.
* [Information about the OpenSSL QUIC protocol implementation](README-QUIC.md)
* [Information about the OpenSSL Provider architecture](README-PROVIDERS.md)
* [Information about using the OpenSSL FIPS validated module](README-FIPS.md)
* [Information about the legacy OpenSSL Engine architecture](README-ENGINES.md)
The OpenSSL Guide
-----------------
There are some tutorial and introductory pages on some important OpenSSL topics
within the [OpenSSL Guide].
Manual Pages
------------
The manual pages for the master branch and all current stable releases are
available online.
- [OpenSSL master](https://www.openssl.org/docs/manmaster)
- [OpenSSL 3.0](https://www.openssl.org/docs/man3.0)
- [OpenSSL 3.1](https://www.openssl.org/docs/man3.1)
- [OpenSSL 3.2](https://www.openssl.org/docs/man3.2)
Demos
-----
There are numerous source code demos for using various OpenSSL capabilities in the
[demos subfolder](./demos).
Wiki
----
There is a [GitHub Wiki] which is currently not very active.
License
=======
OpenSSL is licensed under the Apache License 2.0, which means that
you are free to get and use it for commercial and non-commercial
purposes as long as you fulfill its conditions.
See the [LICENSE.txt](LICENSE.txt) file for more details.
Support
=======
There are various ways to get in touch. The correct channel depends on
your requirement. See the [SUPPORT](SUPPORT.md) file for more details.
Contributing
============
If you are interested and willing to contribute to the OpenSSL project,
please take a look at the [CONTRIBUTING](CONTRIBUTING.md) file.
Legalities
==========
A number of nations restrict the use or export of cryptography. If you are
potentially subject to such restrictions, you should seek legal advice before
attempting to develop or distribute cryptographic code.
Copyright
=========
Copyright (c) 1998-2026 The OpenSSL Project Authors
Copyright (c) 1995-1998 Eric A. Young, Tim J. Hudson
All rights reserved.
<!-- Links -->
[www.openssl.org]:
<https://www.openssl.org>
"OpenSSL Homepage"
[github.com/openssl/openssl]:
<https://github.com/openssl/openssl>
"OpenSSL GitHub Mirror"
[GitHub Wiki]:
<https://github.com/openssl/openssl/wiki>
"OpenSSL Wiki"
[ossl-guide-migration(7ossl)]:
<https://www.openssl.org/docs/manmaster/man7/ossl-guide-migration.html>
"OpenSSL Migration Guide"
[RFC 8446]:
<https://tools.ietf.org/html/rfc8446>
[RFC 6347]:
<https://tools.ietf.org/html/rfc6347>
[RFC 9000]:
<https://tools.ietf.org/html/rfc9000>
[Binaries]:
<https://github.com/openssl/openssl/wiki/Binaries>
"List of third party OpenSSL binaries"
[OpenSSL Guide]:
<https://www.openssl.org/docs/manmaster/man7/ossl-guide-introduction.html>
"An introduction to OpenSSL"
<!-- Logos and Badges -->
[openssl logo]:
doc/images/openssl.svg
"OpenSSL Logo"
[github actions ci badge]:
<https://github.com/openssl/openssl/workflows/GitHub%20CI/badge.svg>
"GitHub Actions CI Status"
[github actions ci]:
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"GitHub Actions CI"
[appveyor badge]:
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[appveyor jobs]:
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"AppVeyor Jobs"