@lelantos-org/sdk / keys / reduceSignatureToScalar
Function: reduceSignatureToScalar()
function reduceSignatureToScalar(sigHex): bigint;Defined in: @lelantos-org/sdk/dist/keys/metamask.d.ts:27
nsk from an EIP-712 signature, over a canonical form of that signature.
Canonicalisation matters because a wallet's whole identity hangs off this. ECDSA admits more than one valid encoding of the same signature over the same digest:
vis written as 27/28 by some wallets and 0/1 by others;(r, s)and(r, n - s)are both valid, and only some signers normalise to the low half.
Hashing the raw 65 bytes therefore derived a different nsk — a different address, and no access to the funds at the old one — from wallet software that merely encoded the same signature differently. So v is dropped and s is folded into its low form before hashing.
This changes derived keys. Any address derived by an earlier version from a signature will not be reproduced here. That is the point — the old derivation was not stable — and it is why this belongs before a deployment rather than after one. The mnemonic and private-key sources are unaffected.
Parameters
| Parameter | Type |
|---|---|
sigHex | string |
Returns
bigint