파일 다운로드 임시 구현

src/lib/services/file.ts

@@ -0,0 +1,10 @@
+import { unwrapDataKey, decryptString } from "$lib/modules/crypto";
+import type { FileInfoResponse } from "$lib/server/schemas";
+
+export const decryptFileMetadata = async (metadata: FileInfoResponse, masterKey: CryptoKey) => {
+  const { dataKey } = await unwrapDataKey(metadata.dek, masterKey);
+  return {
+    dataKey,
+    name: await decryptString(metadata.name, metadata.nameIv, dataKey),
+  };
+};