Method for determining a validity of an application code, corresponding device and computer program product

A electronic device comprising:

• at least one processor,
• a non-secured memory and a secure memory,
• the at least one processor being configured to:
• loading an application into said non-secure memory delivering a current application code;
• determining a footprint of said current application code delivering a current footprint associated with said application;
• obtaining, within said secure memory, a reference footprint associated with said application;
• comparing said current footprint with said reference footprint;
• and
• validating said current application code implemented when said current footprint is identical to said reference footprint, said validating comprising:
• executing an optimization process of the current application code of said application, delivering an optimized application code;
• determining a footprint of said optimized application code, delivering a post-optimization footprint associated with said application;
• and
• recording said post-optimization footprint in said secure memory as a new reference footprint associated with said application.

A non-transitory computer-readable medium comprising a computer program product stored thereon, which comprises program code instructions for executing a method of determining a validity of a code of an application, when the instructions are executed by at least one processor of an electronic device, the electronic device comprising a non-secure memory and a secure memory, the instructions configuring the device to implement at least one iteration of the following:

• loading said application in said non-secure memory, delivering a current application code;
• determining a footprint of said current application code, delivering a current footprint associated with said application;
• obtaining, within said secure memory, a reference footprint associated with said application;
• comparing said current footprint with said reference footprint;
• and
• when said current footprint is identical to said reference footprint, validating said current application code, comprising:
• executing an optimization process of the current application code of said application, delivering an optimized application code;
• determining a footprint of said optimized application code, delivering a post-optimization footprint associated with said application;
• and
• recording said post-optimization footprint in said secure memory as a new reference footprint associated with said application.