Using the PHP functions openssl_pkey_new and openssl_pkey_export to generate an RSA key, how can one ensure the toughest password protection? e.g.

$conf = array (
    'digest_alg'       => 'sha256',
    'private_key_type' => OPENSSL_KEYTYPE_RSA,
    'private_key_bits' => 2048,
    'encrypt_key'      => true,
);
$keypair = openssl_pkey_new( $conf );
openssl_pkey_export( $keypair, $keyout, 'foopass', $conf );

Komut satırından openssl kullanarak, ben şöyle TripleDESGiriş belirtebilirsiniz:

 openssl genrsa -des3 -passout pass:foopass 2048