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Storing the same private key across multiple Trusted Platform Modules (TPMs) is generally not feasible due to the nature of how TPMs are designed to work. Each TPM is designed to securely generate and store keys that are bound to the specific hardware and its unique identity.
Here are a few key points to consider:
Key Generation and Binding: When a key is generated within a TPM, it is tied to that specific TPM. If you try to export a private key from one TPM to another, it usually cannot be imported because the keys are bound to the hardware.
Key Migration: While some TPMs allow for key migration or key wrapping, this typically involves using a key that was specifically created to be exportable and might still require interaction with the original TPM. This isn't standard for private keys that are meant to remain confidential.
Use of Key Splitting or Shares: If you need to access the same private key across multiple systems, consider using key splitting techniques, where the private key is divided into parts and stored on different TPMs, or using a key management system that can facilitate this.
Exportable Keys: If you need to share keys, you might want to look into generating the keys outside of the TPM and then importing them into each TPM in a manner that respects their security protocols.
In summary, directly importing the same private key into multiple TPMs is not typically possible. You would need to use a different approach, such as key wrapping or splitting, depending on your security requirements and use case.