Tarzan with missing sha1

[iolivergithub]

Tarzan fails if TPM does not have sha1 PCR bank,

[iolivergithub]

Looks like if the PCR1 hash is available, BUT, the PCR1 bank is not populted, just teh SHA256 bank - as occurs on modern TPMs, and some vTPMS (looking at you QEMU and Proxmox) then tarzan has a panic over the missing registers when trying to do a PCRRead