![]() ![]() The existing value is concatenated with the argument of the TPM Extend operation. To store a new value in a PCR, the existing value is extended with a new value as follows: PCR = HASHalg( PCR || ArgumentOfExtend) Multiple PCRs associated with the same hashing algorithm are referred to as a PCR bank. A SHA-1 PCR can store 20 bytes - the size of a SHA-1 digest. The size of the value that can be stored in a PCR is determined by the size of a digest generated by an associated hashing algorithm. This article provides background about what happens when you switch PCR banks on TPM 2.0 devices.Ī Platform Configuration Register (PCR) is a memory location in the TPM that has some unique properties. For steps on how to switch PCR banks on TPM 2.0 devices on your PC, you should contact your OEM or UEFI vendor. ![]()
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