SDK

A minimal, headless, ES256-only passkey SDK for Stellar smart accounts.

Strengths

Subpaths & import map

Each subpath is independently importable — tree-shaking is the headline. @stellar/stellar-sdk is a peer dep, never bundled.

API reference

Each area has its own page — signatures, options, returns, and a runnable example, generated from the real types.

Try it — low-S round-trip

A real, runnable computation against the secp256r1 order n. Edit S or reflect it; watch isLowS flip and normalizeLowS bring it back.

The runner reflects a signature scalar S across the secp256r1 order n. When forceHighS is set via mockAuthenticator, isLowS() returns false, and normalizeLowS() brings it back to the low half by computing n − S:

// secp256r1 order
const N = BigInt('0xFFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551');
const HALF = N >> 1n;

function isLowS(S: bigint): boolean {
  return S <= HALF && S > 0n;
}

function normalizeLowS(S: bigint): bigint {
  return S > HALF ? N - S : S;
}

forceHighS via mockAuthenticator → isLowS() === false → normalizeLowS() reflects S → n − S, after which isLowS(normalized) === true.

Try it — feed it a bad input

Each failure throws a real, code-grounded KitError, and the SDK renders the actual errorView. One taxonomy → one layout.

A raw KitError looks like:

{
  "code": "ES256_NOT_SUPPORTED",
  "cause": "ceremonies/create.ts asserts alg === −7"
}