/**
* (non-PHPdoc)
* @see common_user_auth_Adapter::authenticate()
*/
public function authenticate()
{
throw new common_exception_NotImplemented();
$digest = tao_helpers_Http::getDigest();
$data = tao_helpers_Http::parseDigest($digest);
//store the hash A1 as a property to be updated on register/changepassword
$trialLogin = '******';
$trialPassword = '******';
$A1 = md5($trialLogin . ':' . $this::realm . ':' . $trialPassword);
$A2 = md5($_SERVER['REQUEST_METHOD'] . ':' . $data['uri']);
$valid_response = md5($A1 . ':' . $data['nonce'] . ':' . $data['nc'] . ':' . $data['cnonce'] . ':' . $data['qop'] . ':' . $A2);
}