SodiumChachaIetf.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Encryption\Adapter;

class SodiumChachaIetf implements EncryptionAdapterInterface
{
    private $key;

    public function __construct(
        string $key
    ) {
        $this->key = $key;
    }

    public function encrypt(string $data): string
    {
        $nonce = random_bytes(SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES);
        $cipherText = sodium_crypto_aead_chacha20poly1305_ietf_encrypt(
            (string)$data,
            $nonce,
            $nonce,
            $this->key
        );

        return $nonce . $cipherText;
    }

    public function decrypt(string $data): string
    {
        $nonce = mb_substr($data, 0, SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES, '8bit');
        $payload = mb_substr($data, SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES, null, '8bit');

        $plainText = sodium_crypto_aead_chacha20poly1305_ietf_decrypt(
            $payload,
            $nonce,
            $nonce,
            $this->key
        );

        return $plainText;
    }
}