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# openssl_pkcs7_encrypt

(PHP 4 >= 4.0.6, PHP 5)

openssl_pkcs7_encrypt -- Encrypt an S/MIME message

## Description

bool openssl_pkcs7_encrypt ( string infile, string outfile, mixed recipcerts, array headers [, int flags])

openssl_pkcs7_encrypt() 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`, which is either a lone X.509 certificate, or an array of X.509 certificates. `headers` is an array of headers that will be prepended to the data after it has been encrypted. `flags` can be used to specify options that affect the encoding process - see PKCS7 constants. `headers` can be either an associative array keyed by header name, or an indexed array, where each element contains a single header line.

예 1. openssl_pkcs7_encrypt() 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");
}
?>`

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openssl_pkcs7_decrypt | 위로 | openssl_pkcs7_sign