Download and install updates without the help of electron-updater

ts/updater/curve.ts

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+import { randomBytes } from 'crypto';
+
+const g = global as any;
+
+// Because curve wrapper will populate this
+g.Internal = {};
+
+// Because curve wrapper uses 'Module' to get at curve-provided functionality
+// tslint:disable-next-line
+g.Module = require('../../js/curve/curve25519_compiled');
+// tslint:disable-next-line
+require('../../js/curve/curve25519_wrapper');
+
+export type BinaryType = Uint8Array | Buffer;
+
+interface CurveType {
+  keyPair: (
+    privateKey: BinaryType
+  ) => {
+    pubKey: BinaryType;
+    privKey: BinaryType;
+  };
+  sign: (privateKey: BinaryType, message: BinaryType) => BinaryType;
+  verify: (
+    publicKey: BinaryType,
+    message: BinaryType,
+    signature: BinaryType
+  ) => boolean;
+}
+
+const {
+  keyPair: internalKeyPair,
+  sign: internalSign,
+  verify: internalVerify,
+} = g.Internal.curve25519 as CurveType;
+
+export function keyPair() {
+  const privateKey = randomBytes(32);
+  const { pubKey, privKey } = internalKeyPair(privateKey);
+
+  return {
+    publicKey: pubKey,
+    privateKey: privKey,
+  };
+}
+
+export function sign(privateKey: BinaryType, message: BinaryType) {
+  return internalSign(privateKey, message);
+}
+
+export function verify(
+  publicKey: BinaryType,
+  message: BinaryType,
+  signature: BinaryType
+) {
+  const failed = internalVerify(publicKey, message, signature);
+
+  return !failed;
+}