help with end to end encryption

[mcollina]

I'm trying to create a small Matrix client in Node.js and boot E2EE.

This is where I got:

import * as sdk from "matrix-js-sdk";
const myUserId = process.env.MATRIX_USER;
const myAccessToken = process.env.MATRIX_ACCESS_TOKEN;
const client = sdk.createClient({
  baseUrl: "https://matrix.org",
  accessToken: myAccessToken,
  userId: myUserId,
  deviceId: "mydevice",
  cryptoCallbacks: {
    getSecretStorageKey: async (keys) => {
      return [Object.keys(keys.keys)[0], Buffer.from('foobar')];
    },
  },
});

await client.initRustCrypto({ useIndexedDB: false });

client.on(sdk.ClientEvent.Room, async (room) => {
  client.sendMessage(room.roomId, {
    msgtype: "m.text",
    body: "Hello, I'm a bot!",
  });
})


await client.startClient({ initialSyncLimit: 10 });

await client.getCrypto().bootstrapSecretStorage({
    // This function will be called if a new secret storage key (aka recovery key) is needed.
    // You should prompt the user to save the key somewhere, because they will need it to unlock secret storage in future.
    createSecretStorageKey: async (...args) => {
      return {
        keyInfo: {},
        privateKey: Buffer.from('foobar'),
      };
    },
});

await client.getCrypto().bootstrapCrossSigning({
  setupNewCrossSigning: true,
  authUploadDeviceSignatures: async (makeRequest) => {
    console.log('authUploadDeviceSignatures')
    return makeRequest({
      "type": "m.login.password",
      "user": myUserId,
      "password": process.env.MATRIX_PASSWORD,
    });
  }
});

Unfortunately this crashes with an error:

M_UNKNOWN: MatrixError: [400] One time key signed_curve25519:AAAAAAAAAA4 already exists. Old key: {"key":"XX+koCbzdmvfXl5C5Q0","signatures":{"@XXX:matrix.org":{"ed25519:AAA":"AAA"}}}; new key: {'key': 'BB', 'signatures': {'@VV:matrix.org': {'ed25519:mydevice': 'BBB'}}} (https://matrix.org/_matrix/client/v3/keys/upload)
    at parseErrorResponse (file:///Users/matteo/repos/mcbot/node_modules/matrix-js-sdk/lib/http-api/utils.js:78:12)
    at file:///Users/matteo/repos/mcbot/node_modules/matrix-js-sdk/lib/http-api/fetch.js:332:15
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/Users/matteo/repos/mcbot/node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:17)
    at _next (/Users/matteo/repos/mcbot/node_modules/@babel/runtime/helpers/asyncToGenerator.js:17:9)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5) {
  httpStatus: 400,
  httpHeaders: Headers {},
  url: 'https://matrix.org/_matrix/client/v3/keys/upload',
  event: undefined,
  errcode: 'M_UNKNOWN',
  data: {
    errcode: 'M_UNKNOWN',
    error: `One time key XXX already exists. Old key: {"key":"XX+koCbzdmvfXl5C5Q0","signatures":{"@XXX:matrix.org":{"ed25519:AAA":"AAA"}}}; new key: {'key': 'BB', 'signatures': {'@VV:matrix.org': {'ed25519:mydevice': 'BBB'}}}`
  }
}

Node.js v22.14.0

What am I missing?

I see there were a few asks for a complete example for E2EE (#4535 and others). That'd be really helpful.

[richvdh]

This is not a support forum, but what you are missing is persistent storage for the crypto database, by setting useIndexedDB: false.

See README and #4769

[mcollina]

@richvdh as I wrote at the top, I'm trying to use this with Node.js, and as you pointed out in #4769, there is no support for IndexedDB right now in Node.js.