j_rfid_project/app/Service/RsaEncryptionService.php

<?php

namespace App\Service;

class RsaEncryptionService extends Service
{
    public function encrypt($data)
    {
        //公钥文件位于 storage/app/public/rsa/public.pem
        $publicKeyPath = storage_path('app/public/rsa/public.pem');
        $publicKey = openssl_pkey_get_public(file_get_contents($publicKeyPath));

        openssl_public_encrypt($data, $encrypted, $publicKey);
        return base64_encode($encrypted);
    }
}