The following shows the output of a DB2 tool, shipped with your regular DB2 LUW these days:
Keystore Password:
Password successfully stashed to db2_pkcs11_pwd.sth
xxxxx completed sucessfully.
Have a clue? (The "xxxxx" is replacing the name of the db2 tool). If you know the answer, comment and also paste the link to the page in DB2 Knowledge Center describing that tool. I will publish the comments in the next few days.