| commit | d0483e2a8961f7a717bbe86f91f2688834ca40e1 | [log] [tgz] |
|---|---|---|
| author | Pirmin Vogel <vogelpi@lowrisc.org> | Thu Sep 16 19:11:39 2021 +0200 |
| committer | Pirmin Vogel <vogelpi@lowrisc.org> | Mon Sep 20 11:44:43 2021 +0200 |
| tree | 157571907b25404c9d621fc23147f31dec4f31d4 | |
| parent | 698ef88da4160fa4faa2e6fc674950543b62db07 [diff] |
[sca] Optimize sha3_serial for lower noise, return digest via UART This commit contains the following changes to the sha3_serial SCA application: - Instead of busy waiting until KMAC has finished, Ibex is put to sleep while KMAC is busy and the timer is used to wakeup Ibex. This significantly reduces noise. - The dedicated FPGA SCA mode of KMAC is used that allows for first configuring the unit and providing the message without KMAC starting the processing. In a second step, Ibex can then provide the START and PROCESS commands which triggers the actual KMAC operation. This greatly reduces 1) the number of samples that need to be captured, 2) the noise in the captured traces, and 3) the amount of processing. As this mode is only supported on FPGA but not by the final hardware, and thus DIF doesn't support it either, this commit adds the required software functions (inspired by the real DIF). - KMAC is configured to produce a non-zero length digest. The digest is read out and returned to the host via UART. Using a Python model on the host, this allows verifying KMAC operation during capture. Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>
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