Encrypted Cookies in PHP with Libsodium
An open source project by Paragon Initiative Enterprises.
First, you want to generate an encryption key.
$key = new \ParagonIE\Halite\Key;
$key->generate();
echo \Sodium::bin2hex($key->getKey());First, store a sufficiently large random value. Then use it in conjunction with your password to derive a key.
$key = new \ParagonIE\Halite\Key;
$key->derive(
// Password:
'correct horse battery staple is now very shabby',
// Salt:
YOUR_STATIC_HALITE_PW_SALT
);Next, save your key somewhere you can simply do the following:
$key = new \ParagonIE\Halite\Key(\Sodium::hex2bin(SAVED_ENCRYPTION_KEY));
$cookie = new \ParagonIE\Halite\Cookie($key);
$cookie->store($key, $value);Next, save your key somewhere you can simply do the following:
$value = $cookie->fetch($key);