public bool IsExtendablePcr(Tpm2 tpm, int pcr, int locality = 0)
{
byte[] extendablePcrs = ExtendablePcrs;
if (locality != 0)
{
var props = new PtPcr[] { PtPcr.ExtendL1, PtPcr.ExtendL2,
PtPcr.ExtendL3, PtPcr.ExtendL4 };
extendablePcrs = Tpm2.GetPcrProperty(tpm, props[locality - 1]);
}
return(Globs.IsBitSet(extendablePcrs, (int)pcr));
}
public bool IsResettablePcr(Tpm2 tpm, int pcr, int locality = 0)
{
byte[] resettablePcrs = ResettablePcrs;
if (locality == 4)
{
// In accordance with PTP 3.7.1:
// "Note that since the hardware that performs the DRTM sequence at
// Locality 4 is not capable of doing TPM2_PCR_Reset(), the TPM_PT_PCR_RESET_L4
// attribute is repurposed to indicate the initial state of the PCR(0 or - 1)
// and to indicate which PCR are set to 0 by a successful DRTM Sequence.
return(false);
}
if (locality != 0)
{
var props = new PtPcr[] { PtPcr.ResetL1, PtPcr.ResetL2,
PtPcr.ResetL3, PtPcr.ResetL4 };
resettablePcrs = Tpm2.GetPcrProperty(tpm, props[locality - 1]);
}
return(Globs.IsBitSet(resettablePcrs, (int)pcr));
}