krb5_create_derived_keyblock
*outkey = krb5_create_derived_keyblock(key->length);
*d_encr_key = krb5_create_derived_keyblock(key->length);
*d_hmac_key = krb5_create_derived_keyblock(key->length);
krb5_keyblock *krb5_create_derived_keyblock(int);