[keymgr] Use non-deterministic decoy values for KMAC and sideload ports #22535
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Previously, the two shares of the masked values forwarded to KMAC and the sideload ports would be equal when not used. This is non-ideal as the effective value observed on the sideload ports and by KMAC becomes then 0 which may potentially be exploited. This resolves lowRISC#8120. Signed-off-by: Pirmin Vogel <[email protected]>
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Previously, the two shares of the masked values forwarded to KMAC and the sideload ports would be equal when not used. This is non-ideal as the effective value observed on the sideload ports and by KMAC becomes then 0 which may potentially be exploited.
This resolves #8120.