fix(security): use session-unique attestation nonce and raise on malformed report_data - #200
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…_data Closes #152, #153. CRYPTO-002: Replace SHA-256(public_key || b"startup") with SHA-256(public_key || secrets.token_bytes(32)) so each gateway instance produces a unique attestation nonce even when keypairs are shared during blue-green deploys. CRYPTO-003: _build_runtime() now raises ValueError on malformed report_data instead of silently dropping the nonce. A missing nonce removes the session binding from the TRACE Claim; a malformed report_data indicates a broken or compromised TEE shim. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
SHA-256(public_key || random_session_id)— prevents two gateway instances from producing the same nonce during blue-green deploys_build_runtime()now raisesValueErroron malformedreport_datainstead of silently producing aRuntimeInfowithnonce=None; a missing nonce removes the session binding from the TRACE ClaimTest plan
test_build_runtime_valid_report_data_produces_nonce— valid hex produces a noncetest_build_runtime_malformed_report_data_raises— invalid hex raisesValueErrorwith descriptive message🤖 Generated with Claude Code