feat(tee): TPM 2.0 attestation verifier (Tier 3)#29
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Add TPM 2.0 attestation appraisal, all fail-closed: - ca2a_runtime.tee.tpm: TPMS_ATTEST parsing (magic, attest type, qualifying data / nonce, PCR digest) and TpmProvider (attest requires a real TPM). - ca2a_verify.tpm: AK certificate chain to a caller-supplied trusted vendor root, AK signature over the attest blob (ECDSA-SHA256 or RSA PKCS#1 v1.5), magic/type checks, and qualifying-data / PCR-digest binding. Unlike SEV-SNP and TDX, TPM AKs chain to per-vendor EK roots, so there is no single published root; the caller supplies its trusted roots and the verifier is exercised against synthetic self-consistent vectors. Completes the three documented attestation backends (SEV-SNP, TDX, TPM). Suite: 145 passed, 97%. Closes #4 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
The third attestation backend, completing the documented trio (SEV-SNP, TDX, TPM).
ca2a_runtime.tee.tpm: parsesTPMS_ATTEST(magic, attest type, qualifying data / nonce, PCR digest).TpmProvider.attestfails closed off a real TPM.ca2a_verify.tpm.verify_tpm_quote: AK chain → a caller-supplied trusted vendor root; AK signature over the attest blob (ECDSA-SHA256 or RSA PKCS#1 v1.5); magic/type checks; qualifying-data and PCR-digest binding.Scope / honesty
Unlike AMD/Intel, TPM AKs chain to per-vendor EK roots, so there is no single published root to validate against; the caller supplies its trusted roots and the verifier is exercised against synthetic self-consistent vectors. Quote generation requires a real TPM.
Suite: 145 passed, 97% coverage.
Closes #4
🤖 Generated with Claude Code