linux/Documentation/ABI/testing/debugfs-turris-mox-rwtm

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What: /sys/kernel/debug/turris-mox-rwtm/do_sign
Date: Jun 2020
KernelVersion: 5.8
Contact: Marek Behún <kabel@kernel.org>
Description:
======= ===========================================================
(Write) Message to sign with the ECDSA private key stored in
device's OTP. The message must be exactly 64 bytes
(since this is intended for SHA-512 hashes).
(Read) The resulting signature, 136 bytes. This contains the
R and S values of the ECDSA signature, both in
big-endian format.
======= ===========================================================