Call to undefined function openssl encrypt()

Call to undefined function openssl_encrypt()

1 PHP 소스

<?php
$plain = '안녕하슈';
$key = '키키키';
$enc = openssl_encrypt($plain, 'aes256', $key);
$dec = openssl_decrypt($enc, 'aes256', $key);
echo "평문 = [$plain]<br>";
echo "키 = [$key]<br>";
echo "암호화 = [$enc]<br>";
echo "복호화 = [$dec]<br>";
?>

2 문제상황

Fatal error: Call to undefined function openssl_encrypt() in /var/www/php/openssl_test.php on line 4