Sentinel Hardware Keys Developer's Guide - Customer Connection ...

Chapter 7 – Implementing Secure Licensing
Contents Glossary Index Troubleshooting
Frequently Asked Questions
182 Sentinel Hardware Keys Developer’s Guide
Question 1 - If the application failed to obtain a license in one
attempt, do I need to call the SFNTGetLicense function multiple
times?
We recommend calling SFNTGetLicense a few more times, before exiting the
application. For example, you can call the SFNTGetLicense, despite of
encountering SP_ERR_UNIT_NOT_FOUND error in stand-alone environments
and SP_ERR_NO_LICENSE_AVAILABLE in network environments.
Question 2 - Under which conditions are the AES/ECC algorithms in
the token disabled?
The AES and ECC algorithms are NEVER disabled in the token, unless you
apply the deactivation remote update commands (Deactivate AES algorithms
and Deactivate ECC algorithm). However, under the following
conditions, they appear disabled because the licensing functionality associated
with them has expired and the SFNTQueryFeature API function
returns an error:
When the lease period (based on the expiration date or time you
specified) has been reached.
When the number of executions allowed have finished.
When the time tampering takes place as defined in the cheat counter
scenarios on page 170.
Question 3 - Where can I find the query-response pairs for the AES
feature I created? In which format are these written?
The query-response pairs are available in the header file generated under
the Build Options tab. These are written in the hexadecimal format. You
can convert it into ASCII format using the method described below (sample):