使用Mcrypt加密/解密文件
尝试编写一些将加密或解密文件的函数，并使用此处的类来尝试完成此任务：
http://www.itnewb.com/v/PHP-Encryption-Decryption-Using-the-MCrypt-Library-libmcrypt
下面的加密函数似乎有效，因为它似乎加密文件并将其放在目标目录中。我现在正试图解密该文件，它只是死于“无法完成解密”的消息（在那里编码...）在php错误日志中没有任何内容，所以我不确定它为什么会失败，但由于mcrypt对我来说是全新的，我更倾向于相信我在这里做错了...
以下是功能：
//ENCRYPT FILE
function encryptFile() {
global $cryptastic;
$pass = PGPPASS;
$salt = PGPSALT;
$key = $cryptastic->pbkdf2($pass, $salt, 1000, 32) or die("Failed to generate secret key.");
if ($handle = opendir(PATH.'/ftpd')) {
while (false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
$newfile = PATH.'/encrypted/'.$file.'.txt';
$msg = file_get_contents(PATH.'/ftpd/'.$file);
$encrypted = $cryptastic->encrypt($msg, $key) or die("Failed to complete encryption.");
$nfile = fopen($newfile, 'w');
fwrite($nfile, $encrypted);
fclose($nfile);
unlink(PATH.'/ftpd/'.$file);
}
}
closedir($handle);
} //DECRYPT FILE
function inFTP() {
global $cryptastic;
$pass = PGPPASS;
$salt = PGPSALT;
$key = $cryptastic->pbkdf2($pass, $salt, 1000, 32) or die("Failed to generate secret key.");
if ($handle = opendir(PATH.'/encrypted')) {
while (false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
$newfile = PATH.'/decrypted/'.$file;
$msg = PATH.'/encrypted/'.$file;
$decrypted = $cryptastic->decrypt($msg, $key) or die("Failed to complete decryption.");
$nfile = fopen($newfile, 'w');
fwrite($nfile, $decrypted);
fclose($nfile);
//unlink(PATH.'/encrypted/'.$file);
}
}