mirror of
https://github.com/vector-im/hydrogen-web.git
synced 2024-12-24 12:04:57 +01:00
5752cca69c
as base-x isn't meant for base64
58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
/*
|
|
Copyright 2020 The Matrix.org Foundation C.I.C.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
import bs58 from "../../../lib/bs58/index.js";
|
|
import {Key} from "./common.js";
|
|
|
|
const OLM_RECOVERY_KEY_PREFIX = [0x8B, 0x01];
|
|
|
|
/**
|
|
* @param {Olm} olm
|
|
* @param {KeyDescription} keyDescription
|
|
* @param {string} recoveryKey
|
|
* @return {Key}
|
|
*/
|
|
export function keyFromRecoveryKey(olm, keyDescription, recoveryKey) {
|
|
const result = bs58.decode(recoveryKey.replace(/ /g, ''));
|
|
|
|
let parity = 0;
|
|
for (const b of result) {
|
|
parity ^= b;
|
|
}
|
|
if (parity !== 0) {
|
|
throw new Error("Incorrect parity");
|
|
}
|
|
|
|
for (let i = 0; i < OLM_RECOVERY_KEY_PREFIX.length; ++i) {
|
|
if (result[i] !== OLM_RECOVERY_KEY_PREFIX[i]) {
|
|
throw new Error("Incorrect prefix");
|
|
}
|
|
}
|
|
|
|
if (
|
|
result.length !==
|
|
OLM_RECOVERY_KEY_PREFIX.length + olm.PRIVATE_KEY_LENGTH + 1
|
|
) {
|
|
throw new Error("Incorrect length");
|
|
}
|
|
|
|
const keyBits = Uint8Array.from(result.slice(
|
|
OLM_RECOVERY_KEY_PREFIX.length,
|
|
OLM_RECOVERY_KEY_PREFIX.length + olm.PRIVATE_KEY_LENGTH,
|
|
));
|
|
|
|
return new Key(keyDescription, keyBits);
|
|
}
|