matrix-js-sdk/spec/unit/crypto/crypto-utils.ts

import { IRecoveryKey } from "../../../src/crypto/api";
import { CrossSigningLevel } from "../../../src/crypto/CrossSigning";
import { IndexedDBCryptoStore } from "../../../src/crypto/store/indexeddb-crypto-store";
import { MatrixClient } from "../../../src";
import { CryptoEvent } from "../../../src/crypto";

// needs to be phased out and replaced with bootstrapSecretStorage,
// but that is doing too much extra stuff for it to be an easy transition.
export async function resetCrossSigningKeys(
    client: MatrixClient,
    { level }: { level?: CrossSigningLevel } = {},
): Promise<void> {
    const crypto = client.crypto!;

    const oldKeys = Object.assign({}, crypto.crossSigningInfo.keys);
    try {
        await crypto.crossSigningInfo.resetKeys(level);
        await crypto.signObject(crypto.crossSigningInfo.keys.master);
        // write a copy locally so we know these are trusted keys
        await crypto.cryptoStore.doTxn("readwrite", [IndexedDBCryptoStore.STORE_ACCOUNT], (txn) => {
            crypto.cryptoStore.storeCrossSigningKeys(txn, crypto.crossSigningInfo.keys);
        });
    } catch (e) {
        // If anything failed here, revert the keys so we know to try again from the start
        // next time.
        crypto.crossSigningInfo.keys = oldKeys;
        throw e;
    }
    crypto.emit(CryptoEvent.KeysChanged, {});
    // @ts-ignore
    await crypto.afterCrossSigningLocalKeyChange();
}

export async function createSecretStorageKey(): Promise<IRecoveryKey> {
    const decryption = new global.Olm.PkDecryption();
    const storagePublicKey = decryption.generate_key();
    const storagePrivateKey = decryption.get_private_key();
    decryption.free();
    return {
        // `pubkey` not used anymore with symmetric 4S
        keyInfo: { pubkey: storagePublicKey, key: undefined! },
        privateKey: storagePrivateKey,
    };
}