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[crypto] Add a counter to the main loop of ECDSA-P256 verify. #23921

Merged
merged 3 commits into from
Jul 6, 2024
Merged

[crypto] Add a counter to the main loop of ECDSA-P256 verify. #23921

merged 3 commits into from
Jul 6, 2024

Commits on Jul 6, 2024

  1. [crypto] Add a counter to the main loop of ECDSA-P256 verify. 

    This is a lightweight hardening measure against fault-injection attacks on the
loop control flow in OTBN.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
    @jadephilipoom
    jadephilipoom committed Jul 6, 2024
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  2. [crypto] Add a little more control-flow hardening inside P256 loop. 

    Make the counter increments dependent on some should-be-noop instructions
throughout the control flowof the main loop.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
    @jadephilipoom
    jadephilipoom committed Jul 6, 2024
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  3. [rom] Update golden ROM hashes. 

    Updates the golden hashes to incorporate the new counter in P256 verify.

Signed-off-by: Jade Philipoom <jadep@zerorisc.com>
    @jadephilipoom
    jadephilipoom committed Jul 6, 2024
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