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https://github.com/sigmasternchen/php-doc-en
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c148211fa2
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@172416 c90b9560-bf6c-de11-be94-00142212c4b1
92 lines
3.1 KiB
XML
92 lines
3.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.7 $ -->
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<!-- splitted from ./en/functions/openssl.xml, last change in rev 1.1 -->
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<refentry id="function.openssl-seal">
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<refnamediv>
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<refname>openssl_seal</refname>
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<refpurpose>Seal (encrypt) data</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>int</type><methodname>openssl_seal</methodname>
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<methodparam><type>string</type><parameter>data</parameter></methodparam>
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<methodparam><type>string</type><parameter role="reference">sealed_data</parameter></methodparam>
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<methodparam><type>array</type><parameter role="reference">env_keys</parameter></methodparam>
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<methodparam><type>array</type><parameter>pub_key_ids</parameter></methodparam>
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</methodsynopsis>
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<para>
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Returns the length of the sealed data on success, or &false; on error.
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If successful the sealed data is returned in
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<parameter>sealed_data</parameter>, and the envelope keys in
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<parameter>env_keys</parameter>.
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</para>
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<para>
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<function>openssl_seal</function> seals (encrypts)
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<parameter>data</parameter> by using RC4 with a randomly generated
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secret key. The key is encrypted with each of the public keys
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associated with the identifiers in <parameter>pub_key_ids</parameter>
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and each encrypted key is returned
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in <parameter>env_keys</parameter>. This means that one can send
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sealed data to multiple recipients (provided one has obtained their
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public keys). Each recipient must receive both the sealed data and
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the envelope key that was encrypted with the recipient's public key.
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</para>
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<para>
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<example>
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<title><function>openssl_seal</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// $data is assumed to contain the data to be sealed
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// fetch public keys for our recipients, and ready them
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$fp = fopen("/src/openssl-0.9.6/demos/maurice/cert.pem", "r");
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$cert = fread($fp, 8192);
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fclose($fp);
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$pk1 = openssl_get_publickey($cert);
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// Repeat for second recipient
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$fp = fopen("/src/openssl-0.9.6/demos/sign/cert.pem", "r");
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$cert = fread($fp, 8192);
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fclose($fp);
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$pk2 = openssl_get_publickey($cert);
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// seal message, only owners of $pk1 and $pk2 can decrypt $sealed with keys
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// $ekeys[0] and $ekeys[1] respectively.
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openssl_seal($data, $sealed, $ekeys, array($pk1, $pk2));
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// free the keys from memory
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openssl_free_key($pk1);
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openssl_free_key($pk2);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<simpara>
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See also <function>openssl_open</function>.
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</simpara>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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