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I would love to have a hardware-backed soft U2F daemon for Linux. It would be great if this could use a TPM to encrypt the data. What would it take to add such capability to your software? I would be happy to lend my (limited) Rust experience to help make it happen.

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I would too. Go ahead and open an issue and we can chat more, but in short I think the biggest hurdle is understanding TPM2 and what API to use to interact with the device. (TPM2 is necessary so the key material never leaves the TPM, signing happens in the device itself)

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