Bootloader verification extension

A verification extension method for a device, the method comprising:

• obtaining, in response to a request to verify a signature associated with first data, an asymmetric verifier application from off-device storage;
• loading the asymmetric verifier application obtained from the off-device storage;
• prior to executing the asymmetric verifier application, verifying the asymmetric verifier application using a first hashing function and an initial asymmetric verifier application hash retrieved from on-device storage;
• in response to positively verifying the asymmetric verifier application, executing the asymmetric verifier application;
• verifying, using the asymmetric verifier application, the signature associated with the first data using asymmetric-key cryptography;
• and
• in response to a positive or negative verification of the signature associated with the first data, unloading the asymmetric verifier application.