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/*
* TLS Channel - This extension provides a encrypted communication channel
* using the TLS or SSL protocols. It can be layered on top of any
* bi-directional Tcl_Channel.
*
* This was initially built (almost) from scratch based upon observation of
* OpenSSL 0.9.2B.
*
* Copyright (C) 1997-1999 Matt Newman <matt@novadigm.com>
* some modifications:
* Copyright (C) 2000 Ajuba Solutions
* Copyright (C) 2002 ActiveState Corporation
* Copyright (C) 2004 Starfish Systems
* Copyright (C) 2023 Brian O'Hagan
*
* TLS (aka SSL) Channel - can be layered on any bi-directional
* Tcl_Channel (Note: Requires Trf Core Patch)
*
* This was built (almost) from scratch based upon observation of
* OpenSSL 0.9.2B
*
* Addition credit is due for Andreas Kupries (a.kupries@westend.com), for
* Additional credit is due for Andreas Kupries (a.kupries@westend.com), for
* providing the Tcl_ReplaceChannel mechanism and working closely with me
* to enhance it to support full fileevent semantics.
*
* Also work done by the follow people provided the impetus to do this "right":
* tclSSL (Colin McCormack, Shared Technology)
* SSLtcl (Peter Antman)
*
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