Make memeq function side channel silent

tillitis / tillitis-key1

Board designs, FPGA verilog, firmware for TKey, the flexible and open USB security key 🔑

https://www.tillitis.se

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Closed secworks closed 1 year ago

secworks commented 1 year ago

This PR should silence the timing side channel in memeq caused by early return.

quite commented 1 year ago

Good. As we now have committed checksums of firmware and bitstream binaries, which are checked by CI, we know that this change did not affect those.