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Clarify TPM attestation verification instructions #1926

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Sep 24, 2024
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Clarify TPM attestation verification instructions #1926

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4 changes: 2 additions & 2 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -5874,8 +5874,8 @@ engine.
- Verify that `extraData` is set to the hash of |attToBeSigned| using the hash algorithm employed in "alg".
- Verify that `attested` contains a `TPMS_CERTIFY_INFO` structure as specified in [[!TPMv2-Part2]] section 10.12.3,
whose `name` field contains a valid Name for |pubArea|,
as computed using the algorithm in the `nameAlg` field of |pubArea| using the procedure specified in [[!TPMv2-Part1]]
section 16.
as computed using the procedure specified in [[!TPMv2-Part1]]
section 16. Note that the hash algorithm is included within the attested `name` field of the TPMS_CERTIFY_INFO structure.
- Verify that |x5c| is present.
- Note that the remaining fields in the "Standard Attestation Structure" [[!TPMv2-Part1]]
section 31.2, i.e., `qualifiedSigner`, `clockInfo` and `firmwareVersion` are ignored.
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