ibm security directory server hash

[raist2]

Hello, I extracted hashes from a IBM security directory server (LDAP) ; they look like SHA256 salt+hash to me but so far I'm not able to make them work with oclHashcat:
SHA-256:Zjk**********W8y:G3YJBMaNQHrLq********************yhwaejSxlE=
Hope that substituting chars with stars allow me to post the hash.
Do you guys have any ideas?
Regards,
r.