Trusted Platform Module: Difference between revisions

Revision as of 17:36, 4 June 2025

Revision as of 18:10, 4 June 2025

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To utilize a TPM, the user needs a software library that communicates with the TPM and provides a friendlier API than the raw TPM communication. Currently, there are several such open-source TPM 2.0 libraries. Some of them also support TPM 1.2, but mostly TPM 1.2 chips are now deprecated and modern development is focused on TPM 2.0.

Typically, a TPM library provides an API with one-to-one mappings to TPM commands. The TCG specification calls this layer the System API (SAPI). This way, the user has more control over the TPM operations, howeverbut the complexity is high. To hide some of the complexity, most libraries also offer simpler ways to invoke complex TPM operations. The TCG specification call these two layers Enhanced System API (ESAPI) and Feature API (FAPI).

There is currently only one stack that follows the TCG specification. All the other available open-source TPM libraries use their own form of richer API.