本文对应《A Practical Guide to TPM 2.0 — Using the Trusted Platform Module in the New Age of Security》的第8章第1节第3部分。
Platform Configuration Registers (PCRs) —— 平台配置寄存器
The TPM has a number of PCRs, which are accessed using their index. Depending on the platform-specific specification, they can have one or more algorithms. They also have an authentication value and a policy, chosen by the specification (generally NULL), which may be used to change the value stored in the PCR via a PCR extend. Reading the value stored in a PCR doesn’t require authentication. The PC Client platform specifies a minimum of 24 PCRs. Only one bank (a set of PCRs with the same hash algori