Java ssh library that supports putty-generated keys

I want a java application to establish a remote connection using ssh.

I came across jsch and ganymed libraries that look pretty good, but unfortunately do not support the private keys created by puttygen. I read that you can also generate generic keys using puttygen, generate new keys or convert old keys, in which case there will be no choice.

So ... does anyone know any ssh library for java that supports these keys?

thanks a million!