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Filename : SodiumMarshaller.php
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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Cache\Marshaller;

use Symfony\Component\Cache\Exception\CacheException;
use Symfony\Component\Cache\Exception\InvalidArgumentException;

/**
 * Encrypt/decrypt values using Libsodium.
 *
 * @author Ahmed TAILOULOUTE <ahmed.tailouloute@gmail.com>
 */
class SodiumMarshaller implements MarshallerInterface
{
    private $marshaller;
    private $decryptionKeys;

    /**
     * @param string[] $decryptionKeys The key at index "0" is required and is used to decrypt and encrypt values;
     *                                 more rotating keys can be provided to decrypt values;
     *                                 each key must be generated using sodium_crypto_box_keypair()
     */
    public function __construct(array $decryptionKeys, ?MarshallerInterface $marshaller = null)
    {
        if (!self::isSupported()) {
            throw new CacheException('The "sodium" PHP extension is not loaded.');
        }

        if (!isset($decryptionKeys[0])) {
            throw new InvalidArgumentException('At least one decryption key must be provided at index "0".');
        }

        $this->marshaller = $marshaller ?? new DefaultMarshaller();
        $this->decryptionKeys = $decryptionKeys;
    }

    public static function isSupported(): bool
    {
        return \function_exists('sodium_crypto_box_seal');
    }

    /**
     * {@inheritdoc}
     */
    public function marshall(array $values, ?array &$failed): array
    {
        $encryptionKey = sodium_crypto_box_publickey($this->decryptionKeys[0]);

        $encryptedValues = [];
        foreach ($this->marshaller->marshall($values, $failed) as $k => $v) {
            $encryptedValues[$k] = sodium_crypto_box_seal($v, $encryptionKey);
        }

        return $encryptedValues;
    }

    /**
     * {@inheritdoc}
     */
    public function unmarshall(string $value)
    {
        foreach ($this->decryptionKeys as $k) {
            if (false !== $decryptedValue = @sodium_crypto_box_seal_open($value, $k)) {
                $value = $decryptedValue;
                break;
            }
        }

        return $this->marshaller->unmarshall($value);
    }
}