Edit file File name : update_appkey.php Content :<?php @unlink('update_appkey.php'); //Required to autoload the namespaces require_once 'vendor/autoload.php'; //Generate APP_KEY and store it in .env file $key = \Defuse\Crypto\Key::createNewRandomKey(); $appsecret = $key->saveToAsciiSafeString(); echo '<appsecret>'.$appsecret.'</appsecret>'; //Generate private/public keypair using openssl functions $key = openssl_pkey_new([ 'digest_alg' => 'aes256', 'private_key_type' => \OPENSSL_KEYTYPE_RSA, 'encrypt_key' => false, 'encrypt_key_cipher' => \OPENSSL_CIPHER_AES_256_CBC, ]); // export private key openssl_pkey_export($key, $priv_key); // export public key $keyData = openssl_pkey_get_details($key); $public_key = $keyData['key']; $private_key = $priv_key; echo '<publickey>'.$public_key.'</publickey>'; echo '<privatekey>'.$private_key.'</privatekey>'; ?> Save