Harden tamper detection for Frackture payloads with deterministic integrity token - #24
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… token Harden tamper detection by introducing a deterministic integrity token computed over the 32-byte symbolic block and 16 entropy values, and propagate it through both binary and legacy dict payloads. Extend validation, serialization, and reconstruction to populate/verify the token, and enforce token checks in the verifier path. Include the token in the canonical JSON used for envelope signing (HMAC) so tampering with either raw payload or envelope is detectable. Update tests and benchmark helpers to exercise mutation paths and ensure round-trips remain valid. This change may require migrating payload handling to the new token-based format; consumers should adapt to payloads carrying an integrity_token and updated reconstruction behavior.
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Summary
This PR implements a deterministic integrity token for Frackture payloads and tightens tamper detection across serialization, encryption, and reconstruction. The token ensures any modification to the payload or envelope is detected during verification.
Details
BREAKING CHANGE: Consumers must adopt the new token-bearing payloads; legacy payloads without an integrity_token will need migration or explicit conversion.