Can someone give me an indication on the performance (time) of ECDH executed on the STM32F4 board. The STM32F4 has hardware acceleration for ECC (http://www.st.com/st-web-ui/static/active/cn/resource/technical/document/user_manual/CD00208802.pdf) but I can’t find any benchmarks.
[background] I want to setup a secure channel between a smartphone and an embedded device. The embedded device will use the STM32F4 MCU. The communication link will be established over NFC. NFC has an inherent protection against man-in-the-middle attacks so we can use a standard ECDH to establish a symmetric key and encrypt further data exchange. To make sure that ECDH is feasible on the STM32F4 I am searching for some benchmarks.