connected peer. If the result is an empty list then the
        SSL handshake has not yet completed.
        If <em>-local</em> is given, then the certificate information
        is the one used locally.</dd>

<blockquote>
    <dl>
        <dt><strong>all</strong> <em>string</em></dt>
        <dd>Dump of all certificate data.</dd>
        <dt><strong>version</strong> <em>value</em></dt>
        <dd>The certification version</dd>
        <dt><strong>signatureAlgorithm</strong> <em>algorithm</em></dt>
        <dd>Cipher algorithm used for certificate signature.</dd>
        <dt><strong>digest</strong> <em>version</em></dt>
        <dd>Certificate signature digest.</dd>
        <dt><strong>publicKeyAlgorithm</strong> <em>algorithm</em></dt>
        <dd>Certificate signature public key algorithm.</dd>
        <dt><strong>publicKey</strong> <em>string</em></dt>
        <dd>Certificate signature public key.</dd>
        <dt><strong>bits</strong> <em>n</em></dt>
        <dd>Number of bits used for certificate signature key</dd>
        <dt><strong>self_signed</strong> <em>boolean</em></dt>
        <dd>Is certificate signature self signed.</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>subject</strong> <em>dn</em></dt>
        <dd>The distinguished name (DN) of the certificate subject.</dd>
        <dt><strong>issuer</strong> <em>dn</em></dt>
        <dd>The distinguished name (DN) of the certificate issuer.</dd>
        <dt><strong>notBefore</strong> <em>date</em></dt>
        <dd>The begin date for the validity of the certificate.</dd>
        <dt><strong>notAfter</strong> <em>date</em></dt>
        <dd>The expiry date for the certificate.</dd>
        <dt><strong>serialNumber</strong> <em>n</em></dt>
        <dd>The serial number of the certificate.</dd>
        <dt><strong>certificate</strong> <em>cert</em></dt>
        <dd>The PEM encoded certificate.</dd>
        <dt><strong>num_extensions</strong> <em>n</em></dt>
        <dd>Number of certificate extensions.</dd>
        <dt><strong>extensions</strong> <em>list</em></dt>
        <dd>List of certificate extension names.</dd>

        <dd>Certificate verification result.</dd>
        <dt><strong>alpn</strong> <em>protocol</em></dt>
        <dd>The protocol selected after Application-Layer Protocol
	    Negotiation (ALPN).</dd>
        <dt><strong>protocol</strong> <em>value</em></dt>
        <dd>The protocol version used for the connection:
	  SSLv2, SSLv3, TLSv1, TLSv1.1, TLSv1.2, TLSv1.3, or unknown</dd>
        <dt><strong>signatureHashAlgorithm</strong> <em>string</em></dt>
        <dd>The signature hash algorithm.</dd>
        <dt><strong>signature_type</strong> <em>type</em></dt>
        <dd>The signature type value.</dd>
        <dt><strong>subjectAltName</strong> <em>list</em></dt>
        <dd>List of all of the alternative domain names, sub domains,
	    and IP addresses that are secured by the certificate.</dd>
        <dt><strong>ca_names</strong> <em>list</em></dt>
        <dd>List of the Certificate Authorities used to create the certificate.</dd>
    </dl>
</blockquote>

    <dt><a name="tls::connection"><strong>tls::connection</strong>
    <em>channel</em></a></dt>

        <dd>State of the connection.</dd>
        <dt><strong>servername</strong> <em>name</em></dt>
        <dd>The name of the connected to server.</dd>
        <dt><strong>protocol</strong> <em>version</em></dt>
        <dd>The protocol version used for the connection:
	    SSL2, SSL3, TLS1, TLS1.1, TLS1.2, TLS1.3, or unknown.</dd>
        <dt><strong>renegotiation</strong> <em>state</em></dt>
        <dd>Whether protocol renegotiation is supported or not.</dd>
        <dt><strong>securitylevel</strong> <em>level</em></dt>
        <dd>The security level used for selection of ciphers, key size, etc.</dd>
        <dt><strong>session_reused</strong> <em>boolean</em></dt>
        <dd>Whether the session has been reused or not.</dd>
        <dt><strong>is_server</strong> <em>boolean</em></dt>
        <dd>Whether the connection configured as a server or client (false).</dd>
        <dt><strong>cipher</strong> <em>cipher</em></dt>

	  <br>
	  The <em>status</em> argument is an integer representing the
	  current validity of the certificate.
	  A value of <code>0</code> means the certificate is deemed invalid.
	  A value of <code>1</code> means the certificate is deemed valid.
	  <br>
	  The <em>error</em> argument supplies the message, if any, generated

	  by <code>X509_STORE_CTX_get_error()</code>.
	  <br>
	  <br>
	  The callback may override normal validation processing by explicitly
	  returning one of the above <em>status</em> values.
	</dd>

	</dl>