feat(tee): Intel TDX attestation verifier (Tier 3)#27
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Add TDX (DCAP, ECDSA-256) attestation appraisal, all fail-closed: - ca2a_runtime.tee.tdx: Quote v4 parsing (header, TD report body -> MRTD + report data, ECDSA signature section: quote signature, attestation key, QE report, PCK chain) and TdxProvider (attest requires a real TDX guest). - ca2a_verify.tdx: PCK chain to a trusted Intel root, QE report signature by the PCK, attestation-key binding (QE report data commits to the key), quote signature by the attestation key, and MRTD / report-data binding. Validation: the chain path accepts the genuine self-signed Intel SGX Root CA (tests/fixtures/tdx/) and rejects an untrusted root; the multi-level signature path is exercised end to end with a synthetic self-consistent quote, since a genuine quote requires a TDX guest. TPM backend remains Tier 3. Suite: 113 passed, 98% coverage. Closes #3 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
The second attestation backend: a real, fail-closed Intel TDX verifier (DCAP, ECDSA-256).
ca2a_runtime.tee.tdx: parses a TDX v4 quote (header, TD report body → MRTD + report data, and the ECDSA signature section: quote signature, attestation key, QE report, PCK chain).TdxProvider.attestfails closed off hardware.ca2a_verify.tdx.verify_tdx_quote: PCK chain → trusted Intel root; QE report signature by the PCK; attestation-key binding (the QE report data commits to the key); quote signature by the attestation key; MRTD / report-data binding.Validation (real vectors + synthetic fallback)
tests/fixtures/tdx/) and rejects an untrusted root.Byte offsets follow the Intel DCAP Quote v4 layout; end-to-end validation against a real hardware quote remains open. TPM backend remains Tier 3 (#4). Suite: 113 passed, 98% coverage.
Closes #3
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