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extension/shared/keys.ts

47 lines
1.2 KiB
TypeScript

import { x25519 } from "@noble/curves/ed25519";
import {
getCommunicationKey,
getRemoteCommunicationKey,
setCommunicationKey,
setRemoteCommunicationKey,
} from "./vars.js";
import { queryBackground } from "./util.js";
import { bytesToHex, hexToBytes, randomBytes } from "@lumeweb/libweb";
import { secretbox } from "@noble/ciphers/salsa";
export function generateCommunicationKey() {
return x25519.utils.randomPrivateKey();
}
export async function exchangeCommunicationKeys() {
if (!getCommunicationKey()) {
setCommunicationKey(generateCommunicationKey());
}
const pubKey = await queryBackground(
"exchangeCommunicationKeys",
bytesToHex(x25519.getPublicKey(getCommunicationKey())),
);
if (!pubKey) {
throw new Error("could not get communication key");
}
setRemoteCommunicationKey(hexToBytes(pubKey));
}
export async function setLoginKey(key: Uint8Array) {
const privKey = getCommunicationKey();
const pubKey = getRemoteCommunicationKey();
const secret = x25519.getSharedSecret(privKey, pubKey);
const nonce = randomBytes(24);
const box = secretbox(secret, nonce);
const ciphertext = box.seal(key);
await queryBackground("setLoginKey", {
data: bytesToHex(ciphertext),
nonce: bytesToHex(nonce),
});
}