HUUID

Hierarchical UUID — a UUIDv8-compatible (RFC 9562) identifier that embeds an HMAC-SHA256-derived prefix in the UUID's node field, enabling cryptographic local validation of parent-child relationships while preserving full UUID compatibility.

Install

pip install hierarchical-uuid

Requires Python ≥ 3.8. No external dependencies. The module is imported as huuid; the distribution is named hierarchical-uuid on PyPI to keep the naming consistent with the companion package hierarchical-id64, and to avoid collision with an unrelated existing package of the same short name.

Quick start

from huuid import generate_huuid, validate_huuid

secret    = b"replace-with-tenant-scoped-secret"
parent_id = "account:42"

huuid = generate_huuid(parent_id, secret)   # returns a standard uuid.UUID
assert validate_huuid(parent_id, huuid, secret)
print(str(huuid))   # e.g. "861f6b20-e1cc-8942-b135-e412be9faa3e"

For an end-to-end example combining HUUID with a JWT-based session (stateless tenant validation at the edge, no database lookup), see the jwt_validation.py example.

Specification and security model

The full v1.0 specification — including threat model, key rotation guidance, secret-custody as the security perimeter, complementary (not substitutive) authoritative integrity checks, and the graceful-degradation property under secret compromise — is at:

• HUUID v1.0 Specification

Related

For the companion compact 64-bit variant, see HID64.

For the umbrella repository (specifications, threat-model note, IETF-style draft, both reference implementations), see github.com/hektorv/hid.

License

MIT — see LICENSE.