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71 lines
2.3 KiB
TypeScript
71 lines
2.3 KiB
TypeScript
import * as MessageEncrypter from './MessageEncrypter';
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export { MessageEncrypter };
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// libsodium-wrappers requires the `require` call to work
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// tslint:disable-next-line: no-require-imports
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import libsodiumwrappers = require('libsodium-wrappers');
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import { fromHex } from 'bytebuffer';
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import { toHex } from '../utils/String';
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import { ECKeyPair } from '../../receiver/closedGroupsV2';
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export async function getSodium(): Promise<typeof libsodiumwrappers> {
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await libsodiumwrappers.ready;
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return libsodiumwrappers;
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}
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export const concatUInt8Array = (...args: Array<Uint8Array>): Uint8Array => {
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const totalLength = args.reduce((acc, current) => acc + current.length, 0);
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const concatted = new Uint8Array(totalLength);
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let currentIndex = 0;
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args.forEach(arr => {
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concatted.set(arr, currentIndex);
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currentIndex += arr.length;
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});
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return concatted;
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};
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/**
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* Returns a generated curve25519 hex public key being of length 66 and starting with 05.
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* For a closed group v2, we have one publicKey (with prefix) used for polling (this function),
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* and one keypair without prefix used for encoding of the messages (function generateCurve25519KeyPairWithoutPrefix).
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*/
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export async function generateClosedGroupV2PublicKey() {
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const sodium = await getSodium();
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const ed25519KeyPair = sodium.crypto_sign_keypair();
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const x25519PublicKey = sodium.crypto_sign_ed25519_pk_to_curve25519(
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ed25519KeyPair.publicKey
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);
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// prepend version byte (coming from `processKeys(raw_keys)`)
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const origPub = new Uint8Array(x25519PublicKey);
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const prependedX25519PublicKey = new Uint8Array(33);
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prependedX25519PublicKey.set(origPub, 1);
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prependedX25519PublicKey[0] = 5;
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return toHex(prependedX25519PublicKey);
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}
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/**
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* Returns a generated curve25519 keypair without the prefix on the public key.
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*/
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export async function generateCurve25519KeyPairWithoutPrefix(): Promise<ECKeyPair | null> {
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const sodium = await getSodium();
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try {
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const ed25519KeyPair = sodium.crypto_sign_keypair();
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const x25519PublicKey = sodium.crypto_sign_ed25519_pk_to_curve25519(
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ed25519KeyPair.publicKey
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);
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const x25519SecretKey = sodium.crypto_sign_ed25519_sk_to_curve25519(
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ed25519KeyPair.privateKey
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);
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return new ECKeyPair(x25519PublicKey, x25519SecretKey);
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} catch (err) {
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return null;
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}
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}
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