Hi,

I'm now working on implementing UEFI secure boot on U-boot,
in particular, adding "dbt" (timestamp-based revocation) support
as described in UEFI specification, section 32.5.1 paragraph#7.

# To be honest, the description is quite hard for me to understand.
# I've got what it means only after reading corresponding EDK2 code.

My question is: Is there any signing tool on linux, with which
we can directly "timestamp" a PE image with RFC3161-compliant timestamp?

I know that "signtool" in Microsoft's Windows SDK has this feature,
but I wonder what tool major distros use for this purpose.
(They also need to use windows for creating their own distributions?)

I don't think it is very difficult to add the feature to existing
tools like "sbsign," but it would be nice to use "proven" tools
for testing.

Thanks,
-Takahiro Akashi
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