Lennart Poettering
9885c8745d
When measuring data into a PCR we are supposed to hash the data on the CPU and then pass the hash value over the wire to the TPM2. That's all good as long as the data we intend to measure is not sensitive. Let's be extra careful though if we want to measure sensitive data, for example the root file system volume key. Instead of just hashing that and passing it over the wire to the TPM2, let's do a HMAC signature instead. It's also a hash operation, but should protect our secret reasonably well and not leak direct information about it to wiretappers.
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