eldo_user

Eldo Netlist Setup
Protection of Encrypted Libraries
encrypted library, the .LIB command in the netlist is a regular .LIB command (that is, whether
the device model library is encrypted or not does not change the usage).
Eldo decides if access is granted or denied by calling a function in the IP access library. This
function must be coded by the IP provider, and it is in charge of interrogating the provider’s
license daemon to grant/deny access to the necessary feature. See “Creating the IP Access
Library” on page 151.
As it would be too easy to fool this system by replacing the IP access library by another
dynamic library which always returns ‘ALLOWED’, Eldo verifies that the checksum of the
loaded library is the same as the one specified in the .IP_protect command. That means that if a
new IP access library is compiled, the .IP_protect command must be rebuilt, and the model
library re-encrypted, as the CRC will have changed. Note that a CRC is platform dependent, and
therefore several CRCs must be provided in the .IP_protect command to accommodate the
various targeted platforms (ixl and so on).
The standalone executable, eldo_checksum.exe, generates the CRC of the library. This is
available in the standard AMS distribution, located in the $MGC_AMS_HOME/$VCO/bin
directory.
For example, run:
$MGC_AMS_HOME/$VCO/bin/eldo_checksum.exe
where NameOfTheAccessLibrary is a .so file on Linux. Specify this name without its extension.
The utility returns a CRC value which must be provided to the .IP_protect command. It must be
run once for each platform.
The NameOfTheIPprovider character string is used to display correct messages to the final user
if there is a problem during the license check-out.
Related Topics
Coding and Encrypting a Protected Library
Creating the IP Access Library
Installing a Protected Library
List of Encryption Errors and Warnings
Creating the IP Access Library
The required Eldo interface of the IP access library must contain two functions:
ty_lib_status * get_license_third_party(char *feature);
ty_lib_status * release_license_third_party(char *feature);
Eldo® User's Manual, 15.3 151