Convert the Kerberos 5 credential to Kerberos 4 credential.
This is done by sending them to the 524 service in the KDC.
converts the Kerberos 5 credential in
to Kerberos 4 credential that is stored in
is different from
in that way that if
doesnt contain a DES session key, then a new one is fetched from the
KDC and stored in the cred cache
and then the KDC is queried to convert the credential.
This interfaces are used to make the migration to Kerberos 5 from
Kerberos 4 easier.
There are few services that still need Kerberos 4, and this is mainly
for compatibility for those services.
Some services, like AFS, really have Kerberos 5 supports, but still
uses the 524 interface to make the migration easier.