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 <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>
	&warn.experimental.func;
   <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>
  <note>
     <para>This function was added in 4.0.6.</para>
    </note>

  </refsect1>
 </refentry>

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