Developed a custom cryptography backend for the zephyrproject-rtos/mcuboot repository, enabling seamless integration of various crypto libraries and hardware accelerators without modifying the MCUboot core. The solution introduced the MCUBOOT_USE_CUSTOM_CRYPTO option, allowing users to plug in arbitrary cryptographic implementations or proprietary SDKs through a non-invasive backend interface. This approach reduced integration friction and simplified downstream maintenance for embedded systems projects. The work was implemented in C, leveraging expertise in cryptography and embedded systems, and was documented with a clear, signed-off commit to ensure traceability. No bugs were reported or fixed during this period, reflecting focused feature delivery.