The increasing use of IoT objects is associated with a necessity to develop low-power circuit with security concerns. LWC algorithms are used to secure the communications of these connected objects. Energy harvesting techniques can provide the power required by IoT objects. However, it can be subject to sudden power loss, causing the system microcontroller to stop. To enable the cryptographic primitive to recover from an unplanned power failure, we propose a CMOS/MRAM-based hardware implementation of the ASCON cipher. We focus on the ASIC design flow starting from an MTJ electrical model, without redeveloping the existing EDA tools.