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common types and storage for ssss
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src/matrix/e2ee/ssss/common.js
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88
src/matrix/e2ee/ssss/common.js
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/*
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Copyright 2020 The Matrix.org Foundation C.I.C.
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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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export class KeyDescription {
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constructor(id, keyAccountData) {
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this._id = id;
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this._keyAccountData = keyAccountData;
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}
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get id() {
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return this._id;
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}
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get passphraseParams() {
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return this._keyAccountData?.content?.passphrase;
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}
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get algorithm() {
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return this._keyAccountData?.content?.algorithm;
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}
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}
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export class Key {
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constructor(keyDescription, binaryKey) {
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this._keyDescription = keyDescription;
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this._binaryKey = binaryKey;
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}
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get id() {
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return this._keyDescription.id;
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}
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get binaryKey() {
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return this._binaryKey;
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}
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get algorithm() {
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return this._keyDescription.algorithm;
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}
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}
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export async function readDefaultKeyDescription(storage) {
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const txn = await storage.readTxn([
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storage.storeNames.accountData
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]);
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const defaultKeyEvent = await txn.accountData.get("m.secret_storage.default_key");
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const id = defaultKeyEvent?.content?.key;
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if (!id) {
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return;
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}
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const keyAccountData = await txn.accountData.get(`m.secret_storage.key.${id}`);
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return new KeyDescription(id, keyAccountData);
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}
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export async function writeKey(storage, key) {
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const txn = await storage.readWriteTxn([
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storage.storeNames.session
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]);
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try {
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txn.session.set("ssssKey", {id: key.id, binaryKey: key.binaryKey});
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} catch (err) {
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txn.abort();
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throw err;
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}
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await txn.complete();
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}
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export async function readKey(txn) {
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const key = await txn.session.get("ssssKey");
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if (!key) {
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return;
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}
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const keyAccountData = await txn.accountData.get(`m.secret_storage.key.${key.id}`);
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return new Key(new KeyDescription(key.id, keyAccountData), key.binaryKey);
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}
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