58 lines
1.6 KiB
JavaScript
58 lines
1.6 KiB
JavaScript
/*
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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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import bs58 from "../../../lib/bs58/index.js";
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import {Key} from "./common.js";
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const OLM_RECOVERY_KEY_PREFIX = [0x8B, 0x01];
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/**
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* @param {Olm} olm
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* @param {KeyDescription} keyDescription
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* @param {string} recoveryKey
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* @return {Key}
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*/
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export function keyFromRecoveryKey(olm, keyDescription, recoveryKey) {
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const result = bs58.decode(recoveryKey.replace(/ /g, ''));
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let parity = 0;
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for (const b of result) {
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parity ^= b;
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}
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if (parity !== 0) {
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throw new Error("Incorrect parity");
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}
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for (let i = 0; i < OLM_RECOVERY_KEY_PREFIX.length; ++i) {
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if (result[i] !== OLM_RECOVERY_KEY_PREFIX[i]) {
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throw new Error("Incorrect prefix");
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}
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}
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if (
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result.length !==
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OLM_RECOVERY_KEY_PREFIX.length + olm.PRIVATE_KEY_LENGTH + 1
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) {
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throw new Error("Incorrect length");
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}
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const keyBits = Uint8Array.from(result.slice(
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OLM_RECOVERY_KEY_PREFIX.length,
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OLM_RECOVERY_KEY_PREFIX.length + olm.PRIVATE_KEY_LENGTH,
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));
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return new Key(keyDescription, keyBits);
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}
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