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@bascule ("Tony "Abolish ICE" Arcieri 🦀🌹") replied to a tweet by @gcouprie:
@gcouprie Computing an Ed25519 signature takes 543724 cycles on a Cortex M4 @ 84 MHz (STM32F401) https://link.springer.com/chapter/10.1007/978-3-030-25283-0_6
It uses 137 uA/MHz in that mode or 20 mA https://www.st.com/resource/en/application_note/dm00096220-using-stm32f4-mcu-power-modes-with-best-dynamic-efficiency-stmicroelectronics.pdf
At 3.6V that’s 0.072 watts * (0.544 / 84) = 0.000466 joules for a signature