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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.openssl-private-encrypt" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>openssl_private_encrypt</refname>
<refpurpose>Encrypts data with private key</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>openssl_private_encrypt</methodname>
<methodparam><modifier role="attribute">#[\SensitiveParameter]</modifier><type>string</type><parameter>data</parameter></methodparam>
<methodparam><type>string</type><parameter role="reference">encrypted_data</parameter></methodparam>
<methodparam><modifier role="attribute">#[\SensitiveParameter]</modifier><type class="union"><type>OpenSSLAsymmetricKey</type><type>OpenSSLCertificate</type><type>array</type><type>string</type></type><parameter>private_key</parameter></methodparam>
<methodparam choice="opt"><type>int</type><parameter>padding</parameter><initializer><constant>OPENSSL_PKCS1_PADDING</constant></initializer></methodparam>
</methodsynopsis>
<para>
<function>openssl_private_encrypt</function> encrypts <parameter>data</parameter>
with private <parameter>private_key</parameter> and stores the result into
<parameter>encrypted_data</parameter>. Encrypted data can be decrypted via
<function>openssl_public_decrypt</function>.
</para>
<para>
This function can be used e.g. to sign data (or its hash) to prove that it
is not written by someone else.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>encrypted_data</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>private_key</parameter></term>
<listitem>
<para>
<parameter>private_key</parameter> must be the private key that corresponds
to the public key that will be used to decrypt the data.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>padding</parameter></term>
<listitem>
<para>
<parameter>padding</parameter> can be one of
<constant>OPENSSL_PKCS1_PADDING</constant>,
<constant>OPENSSL_NO_PADDING</constant>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>8.0.0</entry>
<entry>
<parameter>private_key</parameter> accepts an <classname>OpenSSLAsymmetricKey</classname>
or <classname>OpenSSLCertificate</classname> instance now;
previously, a &resource; of type <literal>OpenSSL key</literal> or <literal>OpenSSL X.509</literal>
was accepted.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>openssl_public_encrypt</function></member>
<member><function>openssl_public_decrypt</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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