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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.sodium-crypto-box-seal-open" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>sodium_crypto_box_seal_open</refname>
<refpurpose>Anonymous public-key decryption</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type class="union"><type>string</type><type>false</type></type><methodname>sodium_crypto_box_seal_open</methodname>
<methodparam><type>string</type><parameter>ciphertext</parameter></methodparam>
<methodparam><modifier role="attribute">#[\SensitiveParameter]</modifier><type>string</type><parameter>key_pair</parameter></methodparam>
</methodsynopsis>
<para>
Decrypt a message that was encrypted with <function>sodium_crypto_box_seal</function>
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>ciphertext</parameter></term>
<listitem>
<para>
The encrypted message
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>key_pair</parameter></term>
<listitem>
<para>
The keypair of the recipient. Must include the secret key.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
The plaintext on success, &return.falseforfailure;.
</para>
</refsect1>
<refsect1 role="examples"><!-- {{{ -->
&reftitle.examples;
<example xml:id="sodium-crypto-box-seal-open.example.basic"><!-- {{{ -->
<title><function>sodium_crypto_box_seal_open</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Ciphertext is not sensitive; base64_decode is fine
$sealed_b64 = "oRBXXAV4iQBrxlV4A21Bord8Yo/D8ZlrIIGNyaRCcGBfpz0map52I3xq6l+CST+1NSgQkbV+HiYyFjXWiWiaCGupGf+zl4bgWj/A9Adtem7Jt3h3emrMsLw=";
$sealed = base64_decode($sealed_b64);
// Keypair contains a cryptographic secret; use a timing-safe decoder
$keypair_b64 = "KZkF8wnB7bnC2aXB3lFOqCTc0Z6MllvaQb9ASVG8o2/MsewkuE4u1uaEgTzSakeiYyIW8DGj+02/L3cWIbs9bQ==";
$keypair = sodium_base642bin($keypair_b64, SODIUM_BASE64_VARIANT_ORIGINAL);
$opened = sodium_crypto_box_seal_open($sealed, $keypair);
var_dump($opened);
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
string(41) "Writing software in PHP can be a delight!"
]]>
</screen>
</example><!-- }}} -->
</refsect1><!-- }}} -->
</refentry>
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