(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
openssl_pkcs7_encrypt — 加密一个 S/MIME 消息
$input_filename,$output_filename,$certificate,$headers,$flags = 0,$cipher_algo = OPENSSL_CIPHER_AES_128_CBC
openssl_pkcs7_encrypt() 获取名为 input_filename 的文件内容并使用 RC2 40
位的密码将之加密，以至于他们只能被预期的名为 certificate 的接收者阅读。
成功时返回 true， 或者在失败时返回 false。
| 版本 | 说明 |
|---|---|
| 8.1.0 |
默认密码算法（cipher_algo）现在是 AES-128-CBC（OPENSSL_CIPHER_AES_128_CBC）。以前，使用
PKCS7/CMS (OPENSSL_CIPHER_RC2_40)。
|
| 8.0.0 |
certificate 现在接受 OpenSSLCertificate
实例；之前接受类型 OpenSSL X.509 CSR 的 资源(resource)。
|
示例 #1 openssl_pkcs7_encrypt() 示例
<?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");
}
?>