* Find the corresponding X509KeyManager associated to token in alias.
* It returns null if there is n
* @param tokenAlias of the form <tokenName>:<aliasName>
*/
private X509KeyManager getManagerFromToken(String tokenAlias) {
X509KeyManager keyMgr = null;
int ind = -1;
if (supportTokenAlias && tokenAlias != null && (ind = tokenAlias.indexOf(':')) != -1) {
String tokenName = alias.substring(0, ind);
keyMgr = (X509KeyManager)tokenName2MgrMap.get(tokenName);
}