快速接入

require './vendor/autoload.php';
use phpseclib\Crypt\RSA;

/**
 * base64url_encode
 * @param $data
 * @return string
 */
function base64url_encode($data) {
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

/**
 * base64url_decode
 * @param $data
 * @return bool|string
 */
function base64url_decode($data) {
    return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT));
}

//应用信息
$app_key = 'user_app_key';
$rsa_private_key = '';

//参与签名数据
$params = [
    // === 公共参数 ===
    "app_key" => $app_key,
    "signed_at" => '1657892327',
    // === 业务接口参数 ===
    "roomid" => "123456",
    "account" => "123456",
    "username"=> "zhangsan",
];

// 按参数名升序排列
ksort($params);
// 将键值组合
array_walk($params, function (&$value, $key) {
    $value = $key . $value;
});

//加密
$rsa = new RSA();
$rsa->loadKey($rsa_private_key);
$rsa->setSignatureMode(RSA::ENCRYPTION_PKCS1);
$rsa->setHash('md5');
$signString = md5(implode('', $params));
$sign = base64url_encode($rsa->sign($signString));