Token Upgrade시 챌린지를 거치도록 변경

src/lib/server/modules/crypto.ts

@@ -1,10 +1,6 @@
 import { constants, randomBytes, createPublicKey, publicEncrypt, verify } from "crypto";
 import { promisify } from "util";
 
-export const generateRandomBytes = async (length: number) => {
-  return await promisify(randomBytes)(length);
-};
-
 const makePubKeyPem = (pubKey: string) =>
   `-----BEGIN PUBLIC KEY-----\n${pubKey}\n-----END PUBLIC KEY-----`;
 
@@ -32,3 +28,9 @@ export const verifySignature = (data: string, signature: string, sigPubKey: stri
     Buffer.from(signature, "base64"),
   );
 };
+
+export const generateChallenge = async (length: number, encPubKey: string) => {
+  const answer = await promisify(randomBytes)(length);
+  const challenge = encryptAsymmetric(answer, encPubKey);
+  return { answer, challenge };
+};