public static function get_challenge($user)
{
// Return error if any required parameter is missing
if (!isset($user['random']) || !isset($user['public_key'])) {
return false;
}
$user['public_key'] = TrustAuth::fix_key($user['public_key']);
// Load the key into the engine
$rsa = new Crypt_RSA();
$rsa->loadKey($user['public_key']);
$rsa->setEncryptionMode(CRYPT_RSA_ENCRYPTION_PKCS1);
$pre_master_secret = TrustAuth::get_pre_master_secret();
$server_random = TrustAuth::get_server_random();
// Encrypt the pre_master_secret and convert it to hex
$encrypted_secret = bin2hex($rsa->encrypt($pre_master_secret));
$encrypted_random = bin2hex($rsa->encrypt($server_random));
// Encode the encrypted secret as json
return array('status' => true, 'json' => json_encode(array('secret' => $encrypted_secret, 'random' => $encrypted_random, 'status' => TrustAuth::$status['auth'])), 'server' => array('random' => $server_random, 'pre_master_secret' => $pre_master_secret));
}
