无法使用Laravel 5.5中的SSH密钥连接到远程服务器？

Question

I am trying to connect with remote server using SSH Key. I am generating SSH keypair using phpseclib 2.0 and I storing keys in the database. Here is how I am trying to connect.

Config::set('remote.connections.production.host',$server->ip);
Config::set('remote.connections.production.username',$server->username);
Config::set('remote.connections.production.keytext',$server->meta()->where('meta_key','private_key')->first()->meta_value);

I have public key corresponding to the private key I am using in remote server's ~/.ssh/authorized_keys file. The permissions for .ssh directory is 700 and permissions for authorized_keys is 600 which is perfect.

First I thought this might be a issue but then I tried to remove all from the private key before connecting but I am still getting unable to connect to remote server. I don't know where the issue is. I am trying since last two days without luck.

I think SSH key gets damaged once it enters into the database. Here is how I am generating and storing SSH keypair in the database.

$rsa = new RSA();
$rsa->setPublicKeyFormat(RSA::PUBLIC_FORMAT_OPENSSH);
$keys = $rsa->createKey(2048);
$privateKey = $keys['privatekey'];
$publicKey = $keys['publickey'];

$server->meta()->create([
     'meta_key' => 'private_key',
     'meta_value' => $privateKey
]);

$server->meta()->create([
    'meta_key' => 'public_key',
    'meta_value' => $publicKey
]);

Any help would be appreciated. Keys are being generated for sure because I can see it in the database.