[gnutls-devel] GnuTLS | Port openconnect TPM2 code (!1460)

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David Woodhouse commented:


We're using `Esys_RSA_Decrypt` for a signature. Which is mathematically correct, of course, but is it the right thing to do? If we have signature-only keys, might the TPM refuse to let us *decrypt* with them, having trusted us to do the padding for it? If we were to actually ask the TPM to *sign* for us, would I then not have needed to implement all the PSS padding in the first place? :)

I suspect we might need both. Using Esys_RSA_Decrypt() will let us use TLSv1.3 with unrestricted RSA keys even when the TPM knows nothing about PSS, but maybe we should fall back to asking for a signature if the key is restricted?

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