php man page for openssl_pkcs7_encrypt

OPENSSL_PKCS7_ENCRYPT(3)						 1						  OPENSSL_PKCS7_ENCRYPT(3)

openssl_pkcs7_encrypt - Encrypt an S/MIME message

SYNOPSIS
       bool  openssl_pkcs7_encrypt  (string   $infile,	string	 $outfile,  mixed   $recipcerts, array	$headers, [int	$flags], [int  $cipherid =
       OPENSSL_CIPHER_RC2_40])

DESCRIPTION
       openssl_pkcs7_encrypt(3) takes the contents of the file named $infile and encrypts them using an RC2 40-bit cipher so that they can only be
       read by the intended recipients specified by $recipcerts.

PARAMETERS
	      o $infile
		-

	      o $outfile
		-

	      o $recipcerts
		- Either a lone X.509 certificate, or an array of X.509 certificates.

	      o $headers
		-$headers  is  an array of headers that will be prepended to the data after it has been encrypted. $headers can be either an asso-
		ciative array keyed by header name, or an indexed array, where each element contains a single header line.

	      o $flags
		-$flags can be used to specify options that affect the encoding process - see PKCS7 constants.

	      o $cipherid
		- One of cipher constants.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

EXAMPLES
       Example #1

	      openssl_pkcs7_encrypt(3) example

	      <?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 = <<<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" => "nighthawk@example.com", // keyed syntax
			"From: HQ <hq@example.com>", // indexed syntax
			"Subject" => "Eyes only"))) {
		  // message encrypted - send it!
		  exec(ini_get("sendmail_path") . " < enc.txt");
	      }
	      ?>

PHP Documentation Group 												  OPENSSL_PKCS7_ENCRYPT(3)