Php code for rsa encryption and decryption

See more:

PHP

encryption

i have tried the below code

<?php
class MyEncryption
{
public $pubkey = '123';
public $privkey = '123';
public function encrypt($data)
{
if (openssl_public_encrypt($data, $encrypted, $this->pubkey))
$data = base64_encode($encrypted);
else
throw new Exception('Unable to encrypt data. Perhaps it is bigger than the key size?');
return $data;
}
public function decrypt($data)
{
if (openssl_private_decrypt(base64_decode($data), $decrypted, $this->privkey))
$data = $decrypted;
else
$data = '';
return $data;
}
}
$test=new MyEncryption();
echo $test->encrypt("grr");
?>

but i got the below error

Warning: openssl_public_encrypt() [function.openssl-public-encrypt]: key parameter is not a valid public key in C:\xampp\htdocs\speed\rsa.php on line 11
Fatal error: Uncaught exception 'Exception' with message 'Unable to encrypt data. Perhaps it is bigger than the key size?' in C:\xampp\htdocs\speed\rsa.php:14 Stack trace: #0 C:\xampp\htdocs\speed\rsa.php(34): MyEncryption->encrypt('grr') #1 {main} thrown in C:\xampp\htdocs\speed\rsa.php on line 14