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Hanzo AI
3951c5a46c
Introduce TWO new signing modes plus a clarifying rename of the legacy
v0.1 path.
1. pkg/thbs/ — TRUE threshold hash-based signatures in the McGrew et al.
sense (IACR ePrint 2019/793 / IRTF draft-mcgrew-hash-sigs line). For
HBS schemes the signature reveals SELECTED secret elements (WOTS+
chain heads selected by the message-digest base-w digits + FORS
secret leaves selected by the FORS index digest). Threshold signing
here Shamir-shares each secret element across the committee; for
each message parties release shares ONLY for the SELECTED elements;
the combiner Lagrange-reconstructs just those elements; the
verifier sees an ordinary HBS-style signature.
Subpackage layout:
- thbs.go — types per the requested API shape (DKGConfig,
PublicKey, PrivateShare, PartialSignature,
FinalSignature, Evidence, EquivocationError).
- dealer.go — v1 dealer-backed DKG. The dealer Shamir-shares each
secret element across the committee via per-byte
GF(257); the dealer seed is zeroised before return.
v2 will replace with public DKG.
- wots.go — WOTS+ (Winternitz w=16, FIPS 205-style base-w digit
+ checksum decomposition; cSHAKE-256 hash chains).
- fors.go — FORS (k subtrees, height a, per-leaf binary Merkle).
- tree.go — public Merkle tree over WOTS+ leaf-roots.
- slot.go — anti-equivocation slot guard. Same-slot-different-
digest emits Evidence{party, slot, digest_a/b,
share_a/b} for the slashing layer.
- sign.go — SignShare + Aggregate + Verify.
- shamir.go — byte-wise Shamir over GF(257); elements are shared
directly, not seeds.
- hash.go — cSHAKE-256 with the "Magnetar-THBS" function-name
and per-tag domain separation.
24 unit tests pin every invariant: no-seed-exposure,
selected-elements-only for both WOTS+ and FORS, t-of-n threshold,
anti-equivocation, cross-slot/cross-message rejection, tamper
detection.
Honest v1 scope (documented in THBS-SPEC.md):
- Setup is DEALER-BACKED. v2 replaces with public DKG.
- Helper data shipped alongside the public key (McGrew et al.
permit this).
- Verifier is a CUSTOM HBS verifier; v3 will produce FIPS 205-byte-
identical output.
Hard invariant enforced by the package shape:
OK: reconstructElement(slot, elementID, shares)
Forbidden: ReconstructSeed, ReconstructPrivateKey,
ExpandPrivateKey, DeriveAllFutureElements
The only Reconstruct symbol in thbs/*.go is the unexported
reconstructElement in shamir.go.
2. pkg/magnetar/aggregate.go — public-BFT-safe N-of-N collected
signatures. Each validator holds its OWN SLH-DSA keypair (no DKG,
no shared seed). Primitives: GenerateValidatorKey, SignBundle,
VerifyBundle, AggregateSignatures, VerifyAggregated. 10 tests.
3. pkg/magnetar/combine.go — Combine renamed to
CombineWithSeedReconstruction throughout the package + callers
(e2e_test, threshold_test, n1_byte_equality_test, fuzz_test,
genkat, ct/dudect bridge) to make the TEE-only trust caveat
explicit at the API surface. KAT byte-equality preserved: the
function body is unchanged.
Refs: McGrew, Fluhrer, Gazdag, Kampanakis, Morton, Westerbaan,
"Coalition and Threshold Hash-Based Signatures" (IACR ePrint 2019/793);
Bonte, Smart, Tan, "Threshold SPHINCS+", PKC 2024 (the negative result
informing our v1-ships-a-custom-HBS-verifier scope choice).
25 lines
507 B
Plaintext
25 lines
507 B
Plaintext
# Build / test scratch directories
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vectors-first/
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vectors-second/
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vectors-tmp/
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# Editor / OS
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.DS_Store
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*.swp
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*~
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# Local-build artefacts
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/genkat
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/ct/dudect/combine_ct
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# EC theory shells admit-closed at v0.4.0 (admit 0/0 across 13 EC
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# files mirroring Pulsar v1.0.7 reference). proofs/ now tracked.
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# dudect external dependency clone (fetched on demand; never
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# committed).
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ct/dudect/dudect/
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# Jasmin slh-dsa upstream subtree (libjade-SLH-DSA when it lands;
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# fetched on demand).
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jasmin/slh-dsa/libjade/
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