2020-09-17 11:39:25 +02:00
|
|
|
/*
|
|
|
|
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.
|
|
|
|
*/
|
2021-11-25 12:55:00 +01:00
|
|
|
import {Key} from "./common";
|
2021-11-29 11:24:38 +01:00
|
|
|
import {KeyDescription} from "./common";
|
|
|
|
import type {Platform} from "../../platform/web/Platform.js";
|
2021-12-03 06:59:07 +01:00
|
|
|
import type * as OlmNamespace from "@matrix-org/olm";
|
|
|
|
type Olm = typeof OlmNamespace;
|
2021-11-29 11:24:38 +01:00
|
|
|
|
|
|
|
const OLM_RECOVERY_KEY_PREFIX = [0x8B, 0x01] as const;
|
2020-09-17 11:39:25 +02:00
|
|
|
|
2020-09-17 12:33:57 +02:00
|
|
|
/**
|
|
|
|
* @param {Olm} olm
|
|
|
|
* @param {KeyDescription} keyDescription
|
|
|
|
* @param {string} recoveryKey
|
|
|
|
* @return {Key}
|
|
|
|
*/
|
2021-12-03 07:00:57 +01:00
|
|
|
export function keyFromRecoveryKey(keyDescription: KeyDescription, recoveryKey: string, olm: Olm, platform: Platform): Key {
|
2021-02-12 16:01:54 +01:00
|
|
|
const result = platform.encoding.base58.decode(recoveryKey.replace(/ /g, ''));
|
2020-09-17 11:39:25 +02:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|