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	    <dd><b>tls::socket</b> <em> ?-server command? ?options? port</em></dd>
	    <dd><b>tls::handshake</b> <em> channel</em></dd>
	    <dd><b>tls::status </b> <em>?-local? channel</em></dd>
	    <dd><b>tls::connection </b> <em>channel</em></dd>
	    <dd><b>tls::import</b> <em>channel ?options?</em></dd>
	    <dd><b>tls::unimport</b> <em>channel</em></dd>
	    <dt>&nbsp;</dt>
	    <dd><b>tls::cipher</b> <em>name</em></dd>
	    <dd><b>tls::ciphers </b> <em>protocol ?verbose? ?supported?</em></dd>
	    <dd><b>tls::ciphers</b> <em>?protocol? ?verbose? ?supported?</em></dd>
	    <dd><b>tls::digests</b> <em>?name?</em></dd>
	    <dd><b>tls::macs</b></dd>
	    <dd><b>tls::protocols</b></dd>
	    <dd><b>tls::version</b></dd>
	    <dt>&nbsp;</dt>
	    <dd><b>tls::digest</b> <b>-digest</b> <em>name ?options?</em></dd>
	    <dd><b>tls::cmac</b> <b>-cipher</b> <em>name</em> <b>-key</b> <em>key ?options?</em></dd>
	    <dd><b>tls::hmac</b> <b>-digest</b> <em>name</em> <b>-key</b> <em>key ?options?</em></dd>
	    <dd><b>tls::md4</b> <em>data</em></dd>
	    <dd><b>tls::md5</b> <em>data</em></dd>
	    <dd><b>tls::sha1</b> <em>data</em></dd>
	    <dd><b>tls::sha256</b> <em>data</em></dd>
	    <dd><b>tls::sha512</b> <em>data</em></dd>
	</dl>
    </dd>
    <dd><a href="#COMMANDS">COMMANDS</a></dd>
    <dd><a href="#CALLBACK OPTIONS">CALLBACK OPTIONS</a></dd>
    <dd><a href="#HTTPS EXAMPLE">HTTPS EXAMPLE</a></dd>
    <dd><a href="#SEE ALSO">SPECIAL CONSIDERATIONS</a></dd>
    <dd><a href="#SEE ALSO">SEE ALSO</a></dd>
</dl>

<hr>

<h3><a name="NAME">NAME</a></h3>

<p><strong>tls</strong> - binding to <strong>OpenSSL</strong>
toolkit.</p>

<h3><a name="SYNOPSIS">SYNOPSIS</a></h3>

<p><b>package require Tcl 8.4</b><br>
<p><b>package require Tcl 8.5</b><br>
<b>package require tls</b><br>
<br>
<a href="#tls::init"><b>tls::init</b> <i>?options?</i></a><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?options? host port</i><br>
<a href="#tls::socket"><b>tls::socket</b> <i>?-server command? ?options? port</i></a><br>
<a href="#tls::status"><b>tls::status</b> <i>?-local? channel</i></a><br>
<a href="#tls::connection"><b>tls::connection</b> <i>channel</i></a><br>
<a href="#tls::handshake"><b>tls::handshake</b> <i>channel</i></a><br>
<a href="#tls::import"><b>tls::import</b> <i>channel ?options?</i></a><br>
<a href="#tls::unimport"><b>tls::unimport</b> <i>channel</i></a><br>
<br>
<a href="#tls::cipher"><b>tls::cipher</b> <i>name</i></a><br>
<a href="#tls::ciphers"><b>tls::ciphers</b> <i>protocol ?verbose? ?supported?</i></a><br>
<a href="#tls::protocols"><b>tls::protocols</b></a>
<a href="#tls::version"><b>tls::version</b></a>
<a href="#tls::ciphers"><b>tls::ciphers</b> <i>?protocol? ?verbose? ?supported?</i></a><br>
<a href="#tls::digests"><b>tls::digests</b> <i>?name?</i></a><br>
<a href="#tls::macs"><b>tls::macs</b></a><br>
<a href="#tls::protocols"><b>tls::protocols</b></a><br>
<a href="#tls::version"><b>tls::version</b></a><br>
<br>
<a href="#tls::digest"><b>tls::digest</b> <b>-digest</b> <i>name ?options?</i></a><br>
<a href="#tls::cmac"><b>tls::cmac</b> <b>-cipher</b> <i>name</i> <b>-key</b> <i>key ?options?</i></a><br>
<a href="#tls::hmac"><b>tls::hmac</b> <b>-digest</b> <i>name</i> <b>-key</b> <i>key ?options?</i></a><br>
<a href="#tls::md4"><b>tls::md4</b> <i>data</i></a><br>
<a href="#tls::md5"><b>tls::md5</b> <i>data</i></a><br>
<a href="#tls::sha1"><b>tls::sha1</b> <i>data</i></a><br>
<a href="#tls::sha256"><b>tls::sha256</b> <i>data</i></a><br>
<a href="#tls::sha512"><b>tls::sha512</b> <i>data</i></a><br>
</p>

<h3><a name="DESCRIPTION">DESCRIPTION</a></h3>

<p>This extension provides a generic binding to <a
href="http://www.openssl.org/">OpenSSL</a>, utilizing the
<strong>Tcl_StackChannel</strong>
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	<dd>Unique session ticket application data.</dd>
	<dt><strong>master_key</strong> <em>binary_string</em></dt>
	<dd>Unique session master key.</dd>
	<dt><strong>session_cache_mode</strong> <em>mode</em></dt>
	<dd>Server cache mode (client, server, or both).</dd>
    </dl>
</blockquote>

    <dt><a name="tls::cipher"><strong>tls::cipher</strong> <em>name</em></a></dt>
    <dd>Return a list of property names and values describing cipher
	<i>name</i>. Properties include name, description, block_size,
	key_length, iv_length, type, and mode list.</dd>

    <dt><a name="tls::ciphers"><strong>tls::ciphers</strong>
    <em>protocol ?verbose? ?supported?</em></a></dt>
    <dd>Returns a list of supported ciphers available for <em>protocol</em>,
	where protocol must be one of <b>ssl2, ssl3, tls1, tls1.1,
    <em>?protocol? ?verbose? ?supported?</em></a></dt>
    <dd>Without any args, returns a list of all ciphers. With <em>protocol</em>,
	only the ciphers supported for that protocol are returned. See
	<b>tls::protocols</b> command for the supported protocols. If
	tls1.2,</b> or <b>tls1.3</b>. If <em>verbose</em> is specified as
	true then a verbose, human readable list is returned with
	additional information on the cipher. If <em>supported</em>
	is specified as true, then only the ciphers supported for protocol
	will be listed.</dd>
	<em>verbose</em> is specified as true then a verbose, human readable
	list is returned with additional information on the cipher. If
	<em>supported</em> is specified as true, then only the ciphers
	supported for protocol will be listed.</dd>

    <dt><a name="tls::digests"><strong>tls::digests</strong> <em>?name?</em></a></dt>
    <dd>Without <em>name</em>, returns a list of the supported hash algorithms
	for <b>tls::digest</b> command. With <em>name</em>, returns a list of
	property names and values describing digest <i>name</i>. Properties
	include name, description, size, block_size, type, and flags list.</dd>

    <dt><a name="tls::macs"><strong>tls::macs</strong></a></dt>
    <dd>Returns a list of the available Message Authentication Codes (MAC) for
	the <b>tls::digest</b> command.</dd>

    <dt><a name="tls::protocols"><strong>tls::protocols</strong></a></dt>
    <dd>Returns a list of supported protocols. Valid values are:
	<b>ssl2</b>, <b>ssl3</b>, <b>tls1</b>, <b>tls1.1</b>, <b>tls1.2</b>,
	and <b>tls1.3</b>. Exact list depends on OpenSSL version and
	compile time flags.</dd>

    <dt><a name="tls::version"><strong>tls::version</strong></a></dt>
    <dd>Returns the OpenSSL version string.</dd>

    <br>
    <dt><a name="tls::digest"><strong>tls::digest</strong> <b>-digest</b>
	<em>name ?-bin|-hex? [-file filename | -command cmdName |
	-chan channelId | -data data]</em></a></dt>
    <dd>Calculate the message digest for data using <em>digest</em> hash
	function. Returns value as a hex string (default) or as a binary value
	with <b>-bin</b> or <b>-binary</b> option. Digest can be any OpenSSL
	supported hash function including: <b>md4</b>, <b>md5</b>, <b>sha1</b>,
	<b>sha256</b>, <b>sha512</b>, <b>sha3-256</b>, etc. See
	<b>tls::digests</b> command for a full list.
	<br>
	Using the <b>-data</b> option will immediately return the message
	digest for <em>data</em> in the specified format.
	<br>
	Using the <b>-file</b> or <b>-filename</b> option will open file
	<em>filename</em>, read the file data, close the file, and return the
	message digest in the specified format. This uses the TCL APIs, so VFS
	files are supported.
	<br>
	Using the <b>-chan</b> or <b>-channel</b> option, a stacked channel is
	created for <em>channelId</em> and data read from the channel is used
	to calculate a message digest with the result returned with the last
	read operation before EOF. Channel is automatically set to binary mode.
	<br>
	Using the <b>-command</b> option, a new command <em>cmdName</em> is
	created and returned. To add data to the hash function, call
	&quot;<em>cmdName</em> <b>update</b> <em>data</em>&quot;, where data is
	the data to add. When done, call &quot;<em>cmdName</em> <b>finalize</b>&quot;
	to return the message digest.
	</dd>

    <dt><a name="tls::cmac"><strong>tls::cmac</strong> <b>-cipher</b> <em>name</em>
	<b>-key</b> <em>key ?-bin|-hex? [-file filename | -command cmdName |
	-chan channelId | -data data]</em></a></dt>
    <dd>Calculate the Cipher-based Message Authentication Code (CMAC). Same arguments
	as <b>tls::digest</b> with additional option <b>-cipher</b> to specify the
	cipher to use and for certain ciphers, <b>-key</b> to specify the key.</dd>

    <dt><a name="tls::hmac"><strong>tls::hmac</strong> <b>-digest</b> <em>name</em>
	<b>-key</b> <em>key ?-bin|-hex? [-file filename | -command cmdName |
	-chan channelId | -data data]</em></a></dt>
    <dd>Calculate the Hashed Message Authentication Code (HMAC). Same arguments
	as <b>tls::digest</b> with additional option <b>-key</b> to specify the
	key to use. To salt a password, append or prepend the salt
	data to the password. </dd>

    <dt><a name="tls::md4"><strong>tls::md4</strong> <em>data</em></a></dt>
    <dd>Returns the MD4 message-digest for <em>data</em> as a hex string.</dd>

    <dt><a name="tls::md5"><strong>tls::md5</strong> <em>data</em></a></dt>
    <dd>Returns the MD5 message-digest for <em>data</em> as a hex string.</dd>

    <dt><a name="tls::sha1"><strong>tls::sha1</strong> <em>data</em></a></dt>
    <dd>Returns the SHA1 secure hash algorithm digest for <em>data</em> as a hex string.</dd>

    <dt><a name="tls::sha256"><strong>tls::sha256</strong> <em>data</em></a></dt>
    <dd>Returns the SHA-2 SHA256 secure hash algorithm digest for <em>data</em> as a hex string.</dd>

    <dt><a name="tls::sha512"><strong>tls::sha512</strong> <em>data</em></a></dt>
    <dd>Returns the SHA-2 SHA512 secure hash algorithm digest for <em>data</em> as a hex string.</dd>
</dl>

<h3><a name="CALLBACK OPTIONS">CALLBACK OPTIONS</a></h3>

<p>
As indicated above, individual channels can be given their own callbacks
to handle intermediate processing by the OpenSSL library, using the
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