RSA 키 페어 생성 구현

src/lib/index.ts

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-// place files you want to import through the `$lib` alias in this folder.

src/lib/indexedDB.ts

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+import { Dexie, type EntityTable } from "dexie";
+
+interface ClientKeyPair {
+  type: "publicKey" | "privateKey";
+  key: CryptoKey;
+}
+
+const keyStore = new Dexie("keyStore") as Dexie & {
+  clientKeyPairs: EntityTable<ClientKeyPair, "type">;
+};
+
+keyStore.version(1).stores({
+  clientKeyPairs: "type",
+});
+
+export const getKeyPairFromIndexedDB = async () => {
+  const pubKey = await keyStore.clientKeyPairs.get("publicKey");
+  const privKey = await keyStore.clientKeyPairs.get("privateKey");
+  return {
+    pubKey: pubKey?.key ?? null,
+    privKey: privKey?.key ?? null,
+  };
+};
+
+export const storeKeyPairIntoIndexedDB = async (pubKey: CryptoKey, privKey: CryptoKey) => {
+  await keyStore.clientKeyPairs.bulkPut([
+    { type: "publicKey", key: pubKey },
+    { type: "privateKey", key: privKey },
+  ]);
+};