Hi,
you can get all the jar file from your Logon par/war file downloaded from portal. un zip the orginal par file and inside the folder lib you will find the jar files that are suitable.
this statement may be related to security.api.jar files or util jar file (generally required for login par)
you can find jar files in server (EP 7.0) in C:\usr\sap\SID\JCXX(instance number)\j2ee\cluster\serverX\bin\
regards,
mahesh