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@gcouprie Computing an Ed25519 signature takes 543724 cycles on a Cortex M4 @ 84 MHz (STM32F401) https://t.co/SsboMTa1Ci It uses 137 uA/MHz in that mode or 20 mA https://t.co/N6AnYjsvIt At 3.6V that’s 0.072 watts * (0.544 / 84) = 0.000466 joules for a si