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<?php
declare(strict_types=1);
namespace PhpMyAdmin\Crypto;
use Throwable;
use function is_string;
use function mb_strlen;
use function mb_substr;
use function random_bytes;
use function sodium_crypto_secretbox;
use function sodium_crypto_secretbox_open;
use const SODIUM_CRYPTO_SECRETBOX_KEYBYTES;
use const SODIUM_CRYPTO_SECRETBOX_NONCEBYTES;
final class Crypto
{
private function getEncryptionKey(): string
{
global $config;
$key = $config->get('URLQueryEncryptionSecretKey');
if (is_string($key) && mb_strlen($key, '8bit') === SODIUM_CRYPTO_SECRETBOX_KEYBYTES) {
return $key;
}
$key = $_SESSION['URLQueryEncryptionSecretKey'] ?? null;
if (is_string($key) && mb_strlen($key, '8bit') === SODIUM_CRYPTO_SECRETBOX_KEYBYTES) {
return $key;
}
$key = random_bytes(SODIUM_CRYPTO_SECRETBOX_KEYBYTES);
$_SESSION['URLQueryEncryptionSecretKey'] = $key;
return $key;
}
public function encrypt(string $plaintext): string
{
$key = $this->getEncryptionKey();
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox($plaintext, $nonce, $key);
return $nonce . $ciphertext;
}
public function decrypt(string $encrypted): ?string
{
$key = $this->getEncryptionKey();
$nonce = mb_substr($encrypted, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit');
$ciphertext = mb_substr($encrypted, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit');
try {
$decrypted = sodium_crypto_secretbox_open($ciphertext, $nonce, $key);
} catch (Throwable $e) {
return null;
}
if (! is_string($decrypted)) {
return null;
}
return $decrypted;
}
}
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