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0234410b43
Make a library file with some constants and a function to pack olm-encrypted events (which we are going to use from megolm)
79 lines
2.4 KiB
JavaScript
79 lines
2.4 KiB
JavaScript
/*
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Copyright 2016 OpenMarket Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @module olmlib
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*
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* Utilities common to olm encryption algorithms
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*/
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var utils = require("./utils");
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/**
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* matrix algorithm tag for olm
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*/
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module.exports.OLM_ALGORITHM = "m.olm.v1.curve25519-aes-sha2";
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/**
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* matrix algorithm tag for megolm
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*/
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module.exports.MEGOLM_ALGORITHM = "m.megolm.v1.aes-sha2";
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/**
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* Encrypt an event payload for a list of devices
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*
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* @param {string} ourDeviceId
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* @param {module:OlmDevice} olmDevice olm.js wrapper
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* @param {string[]} participantKeys list of curve25519 keys to encrypt for
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* @param {object} payloadFields fields to include in the encrypted payload
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*
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* @return {object} content for an m.room.encrypted event
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*/
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module.exports.encryptMessageForDevices = function(
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ourDeviceId, olmDevice, participantKeys, payloadFields
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) {
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participantKeys.sort();
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var participantHash = ""; // Olm.sha256(participantKeys.join());
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var payloadJson = {
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fingerprint: participantHash,
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sender_device: ourDeviceId,
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};
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utils.extend(payloadJson, payloadFields);
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var ciphertext = {};
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var payloadString = JSON.stringify(payloadJson);
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for (var i = 0; i < participantKeys.length; ++i) {
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var deviceKey = participantKeys[i];
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var sessionId = olmDevice.getSessionIdForDevice(deviceKey);
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if (sessionId === null) {
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// If we don't have a session for a device then
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// we can't encrypt a message for it.
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continue;
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}
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console.log("Using sessionid " + sessionId + " for device " + deviceKey);
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ciphertext[deviceKey] = olmDevice.encryptMessage(
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deviceKey, sessionId, payloadString
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);
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}
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var encryptedContent = {
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algorithm: module.exports.OLM_ALGORITHM,
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sender_key: olmDevice.deviceCurve25519Key,
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ciphertext: ciphertext
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};
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return encryptedContent;
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};
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