setting SSL in tomcat is not part of the BI Platform functionality and you might get better answers in Tomcat forums or Wiki.
Apache Tomcat 7 (7.0.56) - SSL Configuration HOW-TO
A Simple, Step-By-Step Guide To Apache Tomcat SSL Configuration | MuleSoft
If you google your error you get :
https - java.lang.Exception: Input not an X.509 certificate :keytool error - Stack Overflow