Re: tpm2_protocol/tpm2sh

Jarkko Sakkinen
2025-08-14T04:28:47Z

On Thu, Aug 14, 2025 at 07:21:15AM +0300, Jarkko Sakkinen wrote:
> Hi,
>
> Crates for 0.5.4:
>
> https://crates.io/crates/tpm2_protocol
> https://crates.io/crates/tpm2sh
>
> As I said earlier tpm2_protocol is no_std, zero 3rd party dependence
> crate that does not require a memory allocator, and its first priority
> driver for design choices has been Linux kernel. However, given the
> design, it could even power the actual chip itself orchestrated by a
> microcontroller.
>
> It's unipolar TPM 2.0 protocol implementation, which can power anything
> from to actual chips given ability to build and parse both commands and
> responsese.
>
> This mean in English that if you take e.g., a command byte stream, parse
> it and feed that to the builder you will get the exact same bytestream.
> The same principle applies responses.
>
> For upcoming release the rest of the work is basically just populate
> rest of the TCG spec, which is easy given the declarative domain
> language designed with `macro_rules!` construct.
>
> "A demo video":
>
> https://social.kernel.org/notice/Ax9FRqKTBL69UYMIW8
>
> Some things we could do given someone has some driver to do so, which
> we could not realistically do with the pre-existing C driver:
>
> 1. Super high-granularity configurable resource manager (perhaps with
> eBPF filtering)
> 2. Kernel driven vTPMs (as it is bidirectional).
> 3. Perhaps even offer vTPM implementations also for CoC VMs.
> 4. Not in kernel necessarily but if you have a keystore/crypto product
> you can use it for building interoperability layer.
> 5. Given extremely sophisticated building/parsing capabilities,
> implementing e.g., a tailord remote attestation server becomes super
> easy, given that server can use it (w/o TPM ofc) to to carve the data it
> wants from the protocol shenanigans.
>
> Can rarely say this but it's the first ever unipolar and across the
> board role agnostic TPM2 protocol implementation - first of its kind
> :-)

****

BR, Jarkko