You can use the exec action of `find` to do this:
find . -name "*.jar" -exec cksum {} \+
The `exec` action runs the `cksum` command on each result of `find`. The `+` operator specifies that multiple results from `find` are passed to a single execution of `cksum`.
Do note that the order of columns is slightly different from your question. This is governed by the output of the `cksum` command, which outputs the information as [checksum] [byte count] [filename].