Question

how can i know value of string which is used as salt for joomla salt enhanced password encryption??

Answer 1

Joomla generates a random salt for each password. Here you can find valuable information on how to work with the joomla methods to generate passwords:

http://forum.joomla.org/viewtopic.php?f=476&t=308499

From that bit you can see that the salt is stored after the password with a colon as delimiter.

$salt = JUserHelper::genRandomPassword(32);
$crypt = JUserHelper::getCryptedPassword("blabla", $salt);
$password = $crypt . ':' . $salt;

[EDIT]
I just needed to write an Authorisiation Validator with Zend_Auth to validate against a Joomla (1.0) install and I thought I’d update the information here about it. A snip of my code.

$dbAdapter = Zend_Registry::get('jdb');
$this->_authAdapter = new Zend_Auth_Adapter_DbTable($dbAdapter);
$this->_authAdapter->setTableName('jos_users')
->setIdentityColumn('username')
->setCredentialColumn('password');

//Joomla 1.0 uses hashes in the form md5(passwort + salt) + salt
$users = new Users();
$hash = $users->getHash($value);
$salt = substr($hash, strpos($hash, ':') + 1);
$password = md5($context['password'] . $salt) . ':' . $salt;

[/EDIT]