ts-mls/dist/test/scenario/externalPskJoin.test.js

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import { createGroup, joinGroup, makePskIndex } from "../../src/clientState";
import { createCommit } from "../../src/createCommit";
import { ciphersuites, getCiphersuiteFromName, getCiphersuiteImpl } from "../../src/crypto/ciphersuite";
import { generateKeyPackage } from "../../src/keyPackage";
import { bytesToBase64 } from "../../src/util/byteArray";
import { checkHpkeKeysMatch } from "../crypto/keyMatch";
import { testEveryoneCanMessageEveryone } from "./common";
import { defaultLifetime } from "../../src/lifetime";
import { defaultCapabilities } from "../../src/defaultCapabilities";
for (const cs of Object.keys(ciphersuites)) {
    test(`External PSK Join ${cs}`, async () => {
        await externalPskJoin(cs);
    });
}
async function externalPskJoin(cipherSuite) {
    const impl = await getCiphersuiteImpl(getCiphersuiteFromName(cipherSuite));
    const aliceCredential = { credentialType: "basic", identity: new TextEncoder().encode("alice") };
    const alice = await generateKeyPackage(aliceCredential, defaultCapabilities(), defaultLifetime, [], impl);
    const groupId = new TextEncoder().encode("group1");
    let aliceGroup = await createGroup(groupId, alice.publicPackage, alice.privatePackage, [], impl);
    const bobCredential = { credentialType: "basic", identity: new TextEncoder().encode("bob") };
    const bob = await generateKeyPackage(bobCredential, defaultCapabilities(), defaultLifetime, [], impl);
    const addBobProposal = {
        proposalType: "add",
        add: {
            keyPackage: bob.publicPackage,
        },
    };
    const pskSecret = impl.rng.randomBytes(impl.kdf.size);
    const pskNonce = impl.rng.randomBytes(impl.kdf.size);
    const pskId = new TextEncoder().encode("psk-1");
    const pskProposal = {
        proposalType: "psk",
        psk: {
            preSharedKeyId: {
                psktype: "external",
                pskId,
                pskNonce,
            },
        },
    };
    const base64PskId = bytesToBase64(pskId);
    const sharedPsks = { [base64PskId]: pskSecret };
    const commitResult = await createCommit(aliceGroup, makePskIndex(aliceGroup, sharedPsks), false, [addBobProposal, pskProposal], impl);
    aliceGroup = commitResult.newState;
    let bobGroup = await joinGroup(commitResult.welcome, bob.publicPackage, bob.privatePackage, makePskIndex(undefined, sharedPsks), impl, aliceGroup.ratchetTree);
    await testEveryoneCanMessageEveryone([aliceGroup, bobGroup], impl);
    await checkHpkeKeysMatch(aliceGroup, impl);
    await checkHpkeKeysMatch(bobGroup, impl);
}
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