DNV GL performs Common Criteria (CC) evaluations.
Common Criteria is a widely recognised international scheme used to assure security-enforcing products. It provides formal recognition that a developer's claims about the security features of their product are valid and have been independently tested against recognised criteria to a formalised methodology.
Security evaluations are carried out by independent Commercial Evaluation Facilities (CLEFs). Details of the contributions required from the customer and CLEF are given in UKSPs. Products are tested against a Protection Profile which defines how they should operate.
Contact a CLEF to discuss your requirements and agree a charge for the evaluation with them.