About sun.security.tools and sun.security.x509!

Tue May 30 03:31:00 GMT 2006

Hi, all,
I am using sun.security.tools.KeyTool.main class to generate keystore 
and using sun.security.x509 package to control the X509Certificate in my 
application.
I am just wondering whether gcj does support these sun's 
implementations, or is there any free implementation open source project 
uesed to compile my application.
Additionally, I am using gcj4.1,
Thanks for any help.