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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.4 $ -->
<!-- splitted from ./en/functions/openssl.xml, last change in rev 1.4 -->
<refentry id="function.openssl-pkcs7-verify">
<refnamediv>
<refname>openssl_pkcs7_verify</refname>
<refpurpose>Verifies the signature of an S/MIME signed message</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>openssl_pkcs7_verify</methodname>
<methodparam><type>string</type><parameter>filename</parameter></methodparam>
<methodparam><type>int</type><parameter>flags</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>outfilename</parameter></methodparam>
<methodparam choice="opt"><type>array</type><parameter>cainfo</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>extracerts</parameter></methodparam>
</methodsynopsis>
<para>
<function>openssl_pkcs7_verify</function> reads the S/MIME message
contained in the filename specified by <parameter>filename</parameter> and
examines the digital signature. It returns &true; if the signature is
verified, &false; if it is not correct (the message has been tampered with,
or the signing certificate is invalid), or -1 on error.
</para>
<para>
<parameter>flags</parameter> can be used to affect how the signature is
verified - see <link linkend="openssl.pkcs7.flags">PKCS7 constants</link>
for more information.
</para>
<para>
If the <parameter>outfilename</parameter> is specified, it should be a
string holding the name of a file into which the certificates of the
persons that signed the messages will be stored in PEM format.
</para>
<para>
If the <parameter>cainfo</parameter> is specified, it should hold
information about the trusted CA certificates to use in the verification
process - see <link linkend="openssl.cert.verification">certificate
verification</link> for more information about this parameter.
</para>
<para>
If the <parameter>extracerts</parameter> is specified, it is the filename
of a file containing a bunch of certificates to use as untrusted CAs.
</para>
</refsect1>
</refentry>
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