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<dt><strong>serial</strong> <em>n</em></dt>
<dd>The serial number of the certificate.</dd>
<dt><strong>cipher</strong> <em>cipher</em></dt>
<dd>The current cipher in use between the client and
server channels.</dd>
<dt><strong>sbits</strong> <em>n</em></dt>
<dd>The number of bits used for the session key.</dd>
<dt><strong>certificate</strong> <em>n</em></dt>
<dt><strong>certificate</strong> <em>cert</em></dt>
<dd>The PEM encoded certificate.</dd>
<dt><strong>sha1_hash</strong> <em>hash</em></dt>
<dd>The SHA1 hash of the certificate.</dd>
<dt><strong>sha256_hash</strong> <em>hash</em></dt>
<dd>The SHA256 hash of the certificate.</dd>
<dt><strong>alpn</strong> <em>protocol</em></dt>
<dd>The protocol selected after Application-Layer Protocol
Negotiation (ALPN).</dd>
<dt><strong>version</strong> <em>value</em></dt>
<dd>The protocol version used for the connection:
SSLv2, SSLv3, TLSv1, TLSv1.1, TLSv1.2, unknown</dd>
SSLv2, SSLv3, TLSv1, TLSv1.1, TLSv1.2, TLSv1.3, unknown</dd>
</dl>
</blockquote>
<dl>
<dt><a name="tls::import"><b>tls::import </b><i>channel
?options?</i></a></dt>
<dd>SSL-enable a regular Tcl channel - it need not be a
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