PHP でデータを安全に暗号化し、CryptoJS を使用して復号化する方法

<?php
function encrypt($passphrase, $value)
{
    $salt = openssl_random_pseudo_bytes(8);
    $salted = '';
    $dx = '';
    while (strlen($salted) < 48) {
        $dx = md5($dx . $passphrase . $salt, true);
        $salted .= $dx;
    }
    $key = substr($salted, 0, 32);
    $iv = substr($salted, 32, 16);
    $encrypted_data = openssl_encrypt(json_encode($value), 'aes-256-cbc', $key, true, $iv);
    $data = array("ct" => base64_encode($encrypted_data), "iv" => bin2hex($iv), "s" => bin2hex($salt));
    return json_encode($data);
}

function decrypt($passphrase, $jsonStr)
{
    $j = json_decode($jsonStr, true);
    $cipherParams = CryptoJS.lib.CipherParams.create({
        ciphertext: CryptoJS.enc.Base64.parse(j.ct)
    });
    if (j.iv) $cipherParams.iv = CryptoJS.enc.Hex.parse(j.iv)
    if (j.s) $cipherParams.salt = CryptoJS.enc.Hex.parse(j.s)

    $key = substr($result, 0, 32);
    $data = openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
    return json_decode($data, true);
}

function decrypt(passphrase, encryptedData) {
    var cipherParams = CryptoJSAesJson.parse(encryptedData);
    var decrypted = CryptoJS.AES.decrypt(cipherParams, passphrase, {format: CryptoJSAesJson}).toString(CryptoJS.enc.Utf8);
    return decrypted;
}

$encrypted = encrypt('my passphrase', 'value to encrypt');
echo $encrypted; // Encrypted data with salt, iv, and cipher text

var decrypted = decrypt('my passphrase', $encrypted);
console.log(decrypted); // Original 'value to encrypt'