Both client and server-side sockets are possible, and this code should work
on any platform as it uses a generic mechanism for layering on SSL and Tcl.

Full filevent sematics should also be intact - see tests directory for
blocking and non-blocking examples.

The current release is TLS 1.6, with binaries built against OpenSSL 0.9.8g.
The current release is TLS 1.7, with binaries built against OpenSSL 1.1.1.
For best security and function, always compile from source with the latest
official release of OpenSSL (http://www.openssl.org/).

TLS 1.7 and newer require Tcl 8.4.0+, older versions may be used if older
versions of Tcl need to be used.

TclTLS requires OpenSSL or LibreSSL in order to be compiled and function.

# all.tcl --
#
# This file contains a top-level script to run all of the Tcl
# tests.  Execute it by invoking "source all.test" when running tcltest
# in this directory.
#
# Copyright (c) 1998-2000 by Ajuba Solutions.
# All rights reserved.
# 
#
# RCS: @(#) $Id: all.tcl,v 1.5 2000/08/15 18:45:01 hobbs Exp $

#set auto_path [linsert $auto_path 0 [file normalize [file join [file dirname [info script]] ..]]]
set auto_path [linsert $auto_path 0 [file normalize [pwd]]]

if {[lsearch [namespace children] ::tcltest] == -1} {
    package require tcltest

	Windows DLL Build instructions using nmake build system
	2020-10-15 [email protected]
	2023-04-23 Brian O'Hagan

Properties:
- 32 bit DLL
- 64 bit DLL
- VisualStudio 2015
Note: Vuisual C++ 6 does not build OpenSSL (long long syntax error)
Note: Visual C++ 6 does not build OpenSSL (long long syntax error)
- Cygwin32 (temporary helper, please help to replace by tclsh)
- OpenSSL statically linked to TCLTLS DLL.
Note: Dynamic linking also works but results in a DLL dependeny on OPENSSL DLL's
Note: Dynamic linking also works but results in a DLL dependency on OPENSSL DLL's

1) Build OpenSSL static libraries:

(1a) Get OpenSSL
  https://github.com/openssl/openssl/releases/download/OpenSSL_1_1_1t/openssl-1.1.1t.tar.gz

OpenSSL source distribtution unpacked in:
c:\test\tcltls\Openssl_1_1_1h
  OpenSSL source distribution unpacked in:
  C:\Users\Brian\Documents\Source\Build\openssl-1.1.1t

(1b) Install Perl from https://strawberryperl.com/
- Install Perl from http://strawberryperl.com/download/5.32.0.1/strawberry-perl-5.32.0.1-32bit.msi
  to C:\perl
  https://strawberryperl.com/download/5.32.1.1/strawberry-perl-5.32.1.1-64bit.msi
  to C:\Strawberry\perl
  (ActivePerl failed due to missing 32 bit console module)
- Install NASM Assembler:

(1c) Install NASM Assembler from https://www.nasm.us/
https://www.nasm.us/pub/nasm/releasebuilds/2.15.05/win32/nasm-2.15.05-installer-x86.exe
  to C:\Program Files (x86)\NASM
  
-> Visual Studio x86 native prompt.
  https://www.nasm.us/pub/nasm/releasebuilds/2.16.01/win64/nasm-2.16.01-installer-x64.exe
  to C:\Program Files\NASM

(1d)
- Configure
  At Visual Studio x86 native prompt:

set Path=%PATH%;C:\Program Files (x86)\NASM;C:\Perl\perl\bin
set Path=%PATH%;C:\Program Files\NASM;C:\Strawberry\perl\bin

perl Configure VC-WIN32 --prefix=c:\test\tcltls\openssl --openssldir=c:\test\tcltls\openssldir no-shared no-filenames threads
perl ..\Configure VC-WIN64A no-asm no-ssl3 no-zlib no-comp no-ui-console no-autoload-config --api=1.1.0 --prefix="%installdir%" --openssldir="%commoninstalldir%" -DOPENSSL_NO_DEPRECATED


nmake
nmake test
namke install
nmake install

2) Build TCLTLS

Unzip distribution in:
c:\test\tcltls\tcltls-1.7.22
2a) Unzip distribution in:
C:\Users\Brian\Documents\Source\Build\tcltls-b5c41cdeb6

-> start cygwin bash prompt
2b) Start BASH shell (MinGW62 Git shell)

cd /cygdrive/c/test/tcltls/tcltls-1.7.22
cd /c/Users/Brian/Documents/Source/Build/tcltls-b5c41cdeb6
./gen_dh_params > dh_params.h

od -A n -v -t xC < 'tls.tcl' > tls.tcl.h.new.1
sed 's@[^0-9A-Fa-f]@@g;s@..@0x&, @g' < tls.tcl.h.new.1 > tls.tcl.h
rm -f tls.tcl.h.new.1

-> Visual Studio x86 native prompt.
2c) Start Visual Studio shell

cd C:\test\tcltls\tcltls-1.7.22\win
cd C:\Users\Brian\Documents\Source\Build\tcltls-b5c41cdeb6\win

nmake -f makefile.vc TCLDIR=c:\test\tcl8610 SSL_INSTALL_FOLDER=C:\test\tcltls\openssl

nmake -f makefile.vc install TCLDIR=c:\test\tcl8610 INSTALLDIR=c:\test\tcltls SSL_INSTALL_FOLDER=C:\test\tcltls\openssl

3) Test

Start tclsh or wish

lappend auto_path {C:\test\tcltls\tls1.7.22}
package require tls

A small "1.7.22" showing up is hopefully the end of this long way...
package require http
http::register https 443 [list ::tls::socket -autoservername true]
set tok [http::data [http::geturl https://www.tcl-lang.org]]
::http::cleanup $tok

# call nmake with additional parameter SSL_INSTALL_FOLDER= with the
# OpenSSL instalation folder following.
# OpenSSL installation folder following.

PROJECT=tls
DOTVERSION = 1.7.22

PRJ_INCLUDES	= -I"$(SSL_INSTALL_FOLDER)\include"
PRJ_DEFINES =  -D NO_SSL2 -D NO_SSL3 -D _CRT_SECURE_NO_WARNINGS
PRJ_INCLUDES = -I"$(SSL_INSTALL_FOLDER)\include" -I"$(OPENSSL_INSTALL_DIR)\include"
PRJ_DEFINES = -D NO_SSL2 -D NO_SSL3 -D _CRT_SECURE_NO_WARNINGS
 
# SSL Libs:
#    1. ${LIBCRYPTO}.dll
#    2. ${LIBSSL}.dll
# Where LIBCRYPTO (#1.) and LIBSSL (#2.) are defined as follows:
#    v1.1: libcrypto-1.1-x64.dll and libssl-1.1-x64.dll
#    v3: libcrypto-3-x64.dll and libssl-3-x64.dll
# On *nix libcrypto.so.* and libssl.so.* (where suffix is a version indicator).
#

PRJ_LIBS = \
	"$(SSL_INSTALL_FOLDER)\lib\libssl.lib" \
	"$(SSL_INSTALL_FOLDER)\lib\libcrypto.lib" \
	WS2_32.LIB GDI32.LIB ADVAPI32.LIB CRYPT32.LIB USER32.LIB

PRJ_OBJS = $(TMP_DIR)\tls.obj \

#------------------------------------------------------------- -*- makefile -*-
# targets.vc --
#
# Part of the nmake based build system for Tcl and its extensions.
# This file defines some standard targets for the convenience of extensions
# and can be optionally included by the extension makefile.
# See TIP 477 (https://core.tcl-lang.org/tips/doc/trunk/tip/477.md) for docs.
# See TIP 477 (https://core.tcl-lang.org/tips/doc/main/tip/477.md) for docs.

$(PROJECT): setup pkgindex $(PRJLIB)

!ifdef PRJ_STUBOBJS
$(PROJECT): $(PRJSTUBLIB)
$(PRJSTUBLIB): $(PRJ_STUBOBJS)
	$(LIBCMD) $**