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add ssss recovery key fn to prototype

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This commit is contained in:
Bruno Windels 2020-09-16 18:20:56 +02:00
parent 729e669ec8
commit aac67ff890
1 changed files with 36 additions and 0 deletions
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36
prototypes/derive-keys.js vendored
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@ -1,3 +1,5 @@
import bs58 from "../lib/bs58/index.js";
function subtleCryptoResult(promiseOrOp, method) {
if (promiseOrOp instanceof Promise) {
return promiseOrOp;
@ -190,6 +192,7 @@ class CryptoDeriveDriver {
* @return {BufferSource}
*/
async pbkdf2(password, iterations, salt, hash, length) {
// check for existance of deriveBits, which IE11 does not have
const key = await subtleCryptoResult(this._subtleCrypto.importKey(
'raw',
password,
@ -420,3 +423,36 @@ export async function decryptSession(backupKeyBase64, backupInfo, sessionRespons
);
return JSON.parse(sessionInfo);
}
const OLM_RECOVERY_KEY_PREFIX = [0x8B, 0x01];
export async function deserializeSSSSKey(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 + window.Olm.PRIVATE_KEY_LENGTH + 1
) {
throw new Error("Incorrect length");
}
return Uint8Array.from(result.slice(
OLM_RECOVERY_KEY_PREFIX.length,
OLM_RECOVERY_KEY_PREFIX.length + window.Olm.PRIVATE_KEY_LENGTH,
));
}