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fix(sdk-lib-mpc): use MPSUtil.executeTillRound in derive tests #8790

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Marzooqa merged 1 commit into from
May 18, 2026
+23 −10
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fix(sdk-lib-mpc): use MPSUtil.executeTillRound in derive tests #8790

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33 changes: 23 additions & 10 deletions modules/sdk-lib-mpc/test/unit/tss/eddsa/derive.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,8 @@
import assert from 'assert';
import { ed25519 } from '@noble/curves/ed25519';
import { EddsaMPSDsg, MPSUtil } from '../../../../src/tss/eddsa-mps';
import { deriveUnhardenedMps } from '../../../../src/tss/eddsa-mps/derive';
import { generateEdDsaDKGKeyShares, runEdDsaDSG } from './util';
import { generateEdDsaDKGKeyShares } from './util';

const MESSAGE = Buffer.from('The Times 03/Jan/2009 Chancellor on brink of second bailout for banks');

Expand Down Expand Up @@ -63,28 +64,40 @@ describe('deriveUnhardenedMps', function () {
});

describe('DSG signature cross-check against the public key derived by deriveUnhardenedMps', function () {
let sigAtRoot: Buffer;
let sigAtM0: Buffer;
let sigAtM01: Buffer;

before(function () {
const dsgA1 = new EddsaMPSDsg.DSG(0);
MPSUtil.executeTillRound(3, dsgA1, new EddsaMPSDsg.DSG(2), userKeyShare, bitgoKeyShare, MESSAGE, 'm');
sigAtRoot = dsgA1.getSignature();

const dsgA2 = new EddsaMPSDsg.DSG(0);
MPSUtil.executeTillRound(3, dsgA2, new EddsaMPSDsg.DSG(2), userKeyShare, bitgoKeyShare, MESSAGE, 'm/0');
sigAtM0 = dsgA2.getSignature();

const dsgA3 = new EddsaMPSDsg.DSG(0);
MPSUtil.executeTillRound(3, dsgA3, new EddsaMPSDsg.DSG(2), userKeyShare, bitgoKeyShare, MESSAGE, 'm/0/1');
sigAtM01 = dsgA3.getSignature();
});

it('signature from DSG at "m" verifies against the root public key', function () {
const { dsgA } = runEdDsaDSG(userKeyShare, bitgoKeyShare, 0, 2, MESSAGE, 'm');
const sig = dsgA.getSignature();
assert(ed25519.verify(sig, MESSAGE, rootPubKey), 'DSG at "m" should verify against the raw DKG public key');
assert(ed25519.verify(sigAtRoot, MESSAGE, rootPubKey), 'DSG at "m" should verify against the raw DKG public key');
});

it('signature from DSG at "m/0" verifies against deriveUnhardenedMps(commonKeychain, "m/0")', function () {
const derivedPk = Buffer.from(deriveUnhardenedMps(commonKeychain, 'm/0').slice(0, 64), 'hex');
const { dsgA } = runEdDsaDSG(userKeyShare, bitgoKeyShare, 0, 2, MESSAGE, 'm/0');
const sig = dsgA.getSignature();
assert(
ed25519.verify(sig, MESSAGE, derivedPk),
ed25519.verify(sigAtM0, MESSAGE, derivedPk),
'DSG at "m/0" should verify against deriveUnhardenedMps result at "m/0"'
);
});

it('signature from DSG at "m/0/1" verifies against deriveUnhardenedMps(commonKeychain, "m/0/1")', function () {
const derivedPk = Buffer.from(deriveUnhardenedMps(commonKeychain, 'm/0/1').slice(0, 64), 'hex');
const { dsgA } = runEdDsaDSG(userKeyShare, bitgoKeyShare, 0, 2, MESSAGE, 'm/0/1');
const sig = dsgA.getSignature();
assert(
ed25519.verify(sig, MESSAGE, derivedPk),
ed25519.verify(sigAtM01, MESSAGE, derivedPk),
'DSG at "m/0/1" should verify against deriveUnhardenedMps result at "m/0/1"'
);
});
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