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Re-add the secret storage key cache

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This commit is contained in:
J. Ryan Stinnett 2019-12-11 14:28:02 +00:00
parent c2cd97fab3
commit c5099b9b96
1 changed files with 17 additions and 0 deletions
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17
src/CrossSigningManager.js
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@ -20,12 +20,25 @@ import MatrixClientPeg from './MatrixClientPeg';
import { deriveKey } from 'matrix-js-sdk/lib/crypto/key_passphrase';
import { decodeRecoveryKey } from 'matrix-js-sdk/lib/crypto/recoverykey';
// This stores the secret storage private keys in memory for the JS SDK. This is
// only meant to act as a cache to avoid prompting the user multiple times
// during the same session. It is considered unsafe to persist this to normal
// web storage. For platforms with a secure enclave, we will store this key
// there.
const secretStorageKeys = {};
export const getSecretStorageKey = async ({ keys: keyInfos }) => {
const keyInfoEntries = Object.entries(keyInfos);
if (keyInfoEntries.length > 1) {
throw new Error("Multiple storage key requests not implemented");
}
const [name, info] = keyInfoEntries[0];
// Check the in-memory cache
if (secretStorageKeys[name]) {
return [name, secretStorageKeys[name]];
}
const inputToKey = async ({ passphrase, recoveryKey }) => {
if (passphrase) {
return deriveKey(
@ -54,5 +67,9 @@ export const getSecretStorageKey = async ({ keys: keyInfos }) => {
throw new Error("Secret storage access canceled");
}
const key = await inputToKey(input);
// Save to cache to avoid future prompts in the current session
secretStorageKeys[name] = key;
return [name, key];
};