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php-manual-en-4.3.0-2mdk.noarch.rpm

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>openssl_pkcs7_encrypt</H1
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><P
>    (PHP 4 &#62;= 4.0.6)</P
>openssl_pkcs7_encrypt&nbsp;--&nbsp;Encrypt an S/MIME message</DIV
><DIV
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NAME="AEN68251"
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><H2
>Description</H2
>bool <B
CLASS="methodname"
>openssl_pkcs7_encrypt</B
> ( string infile, string outfile, mixed recipcerts, array headers [, long flags])<BR
></BR
><P
>&#13;     <B
CLASS="function"
>openssl_pkcs7_encrypt()</B
> takes the contents of the
     file named <TT
CLASS="parameter"
><I
>infile</I
></TT
> and encrypts them using an RC2
     40-bit cipher so that they can only be read by the intended recipients
     specified by <TT
CLASS="parameter"
><I
>recipcerts</I
></TT
>, which is either a
     lone X.509 certificate, or an array of X.509 certificates.
     <TT
CLASS="parameter"
><I
>headers</I
></TT
> is an array of headers that
     will be prepended to the data after it has been encrypted.
     <TT
CLASS="parameter"
><I
>flags</I
></TT
> can be used to specify options that affect
     the encoding process - see <A
HREF="ref.openssl.html#openssl.pkcs7.flags"
>PKCS7
     constants</A
>.
     <TT
CLASS="parameter"
><I
>headers</I
></TT
> can be either an associative array
     keyed by header name, or an indexed array, where each element contains
     a single header line.
    </P
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>Example 1. <B
CLASS="function"
>openssl_pkcs7_encrypt()</B
> example</B
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><PRE
CLASS="php"
>// the message you want to encrypt and send to your secret agent
// in the field, known as nighthawk.  You have his certificate
// in the file nighthawk.pem
$data = &#60;&#60;&#60;EOD
Nighthawk,

Top secret, for your eyes only!

The enemy is closing in! Meet me at the cafe at 8.30am
to collect your forged passport!

HQ
EOD;

// load key
$key = file_get_contents("nighthawk.pem");

// save message to file
$fp = fopen("msg.txt", "w");
fwrite($fp, $data);
fclose($fp);

// encrypt it
if (openssl_pkcs7_encrypt("msg.txt", "enc.txt", $key,
    array("To" =&#62; "nighthawk@example.com", // keyed syntax
          "From: HQ &#60;hq@example.com&#62;", // indexed syntax
          "Subject" =&#62; "Eyes only")))
{
    // message encrypted - send it!
    exec(ini_get("sendmail_path") . " &#60; enc.txt");
}</PRE
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