Ryan Henry 0d22946a0e Checkpoint the party/runtime stack before share-program and malicious-mode work.

Ship the TLS mesh, composer, Beaver/Yao/leaf MPC, prep/online paths, apps, and docs so the tree is pushable before elevating share_expr, security_mode, and prep resume.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-09-28 05:59:19 -06:00

1.4 KiB

Raw Blame History

Comparisons & ranges

\htmlonly

ELI5. The predicate is part of the key, not a test you run after expanding a point key. Greater-than, less-than, and equality each return one payload on the true side and another on the false side. Interval containment is one key for both endpoints. Shares of a comparison add.

\endhtmlonly

A distributed comparison function returns a payload when a predicate holds on the secret point. Shares are additive: reconstruct adds them.

Call	When it is hot
`dpf::lt` / `leq` / `gt` / `geq`	The public query is on that side of the secret point
`dpf::eq`	The public query equals the secret point
`dpf::ic`	The secret point lies in a public interval
`dpf::idcf` / `cmp_prefix<L>`	A correction at every depth, or only the first `L` bits
`dpf::block_width<B>`	Ring words only at checkpoints `B` levels apart

auto [k0, k1] = dpf::make_dpf(std::uint8_t{40}, dpf::gt(std::uint64_t{1}));
auto opened = dpf::reconstruct(
    dpf::eval_point(dpf::cmp, k0, std::uint8_t{50}),
    dpf::eval_point(dpf::cmp, k1, std::uint8_t{50}));
// opened == 1

A wildcard comparison payload is filled later with assign_cmp. Eval before that throws.

Go deeper: [dcf.hpp](@ref dpf/dcf.hpp), [interval.hpp](@ref dpf/interval.hpp), [blocked_dcf.hpp](@ref dpf/blocked_dcf.hpp), [F_DCF](@ref dcf.hpp).

1.4 KiB Raw Blame History

Comparisons & ranges

1.4 KiB

Raw Blame History