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+What: /sys/kernel/debug/turris-mox-rwtm/do_sign
+Date: Jun 2020
+KernelVersion: 5.8
+Contact: Marek BehĂșn <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.
+ ======= ===========================================================