   #PHP Manual OpenSSL functions openssl_pkcs7_encrypt
   openssl_pkcs7_verify

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                              openssl_pkcs7_sign

   (PHP 4 >= 4.0.6)
   openssl_pkcs7_sign -- sign an S/MIME message

Description

   bool openssl_pkcs7_sign ( string infilename, string outfilename, mixed
   signcert, mixed privkey, array headers [, int flags [, string
   extracerts]])

   openssl_pkcs7_sign() takes the contents of the file named infilename
   and signs them using the certificate and it's matching private key
   specified by signcert and privkey parameters.

   headers is an array of headers that will be prepended to the data
   after it has been signed (see openssl_pkcs7_encrypt() for more
   information about the format of this parameter.

   flags can be used to alter the output - see PKCS7 constants - if not
   specified, it defaults to PKCS7_DETACHED.

   extracerts specifies the name of a file containing a bunch of extra
   certificates to include in the signature which can for example be used
   to help the recipient to verify the certificate that you used.

   Example 1. openssl_pkcs7_sign() example
   <?php
   // the message you want to sign so that recipient can be sure it was
   you that
   // sent it
   $data = <<<EOD
   You have my authorization to spend $10,000 on dinner expenses.
   The CEO
   EOD;
   // save message to file
   $fp = fopen("msg.txt", "w");
   fwrite($fp, $data);
   fclose($fp);
   // encrypt it
   if (openssl_pkcs7_sign("msg.txt", "signed.txt", "mycert.pem",
       array("mycert.pem", "mypassphrase"),
       array("To" => "joes@example.com", // keyed syntax
             "From" => "HQ <ceo@example.com>", // indexed syntax
             "Subject" => "Eyes only")
       )) {
       // message signed - send it!
       exec(ini_get("sendmail_path") . " < signed.txt");
   }
   ?>

     Note: This function was added in 4.0.6.
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