Krb5LoginModule verify TGT?

[cneberg]

How do I get the com.sun.security.auth.module.Krb5LoginModule login module
to verify the TGT against a key in the keytab like is done in
krb5_verify_init_creds() which is part of C Krb5 API?

Notes on that API

http://www.daemon-systems.org/man/krb5_verify_init_creds.3.html

Thanks,
Christopher
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