RSA 키 페어 생성 구현

package.json

@@ -26,6 +26,7 @@
     "@types/jsonwebtoken": "^9.0.7",
     "@types/ms": "^0.7.34",
     "autoprefixer": "^10.4.20",
+    "dexie": "^4.0.10",
     "drizzle-kit": "^0.22.0",
     "eslint": "^9.7.0",
     "eslint-config-prettier": "^9.1.0",

pnpm-lock.yaml

@@ -52,6 +52,9 @@ devDependencies:
   autoprefixer:
     specifier: ^10.4.20
     version: 10.4.20(postcss@8.4.49)
+  dexie:
+    specifier: ^4.0.10
+    version: 4.0.10
   drizzle-kit:
     specifier: ^0.22.0
     version: 0.22.8
@@ -1745,6 +1748,10 @@ packages:
     resolution: {integrity: sha512-maua5KUiapvEwiEAe+XnlZ3Rh0GD+qI1J/nb9vrJc3muPXvcF/8gXYTWF76+5DAqHyDUtOIImEuo0YKE9mshVw==}
     dev: true
 
+  /dexie@4.0.10:
+    resolution: {integrity: sha512-eM2RzuR3i+M046r2Q0Optl3pS31qTWf8aFuA7H9wnsHTwl8EPvroVLwvQene/6paAs39Tbk6fWZcn2aZaHkc/w==}
+    dev: true
+
   /didyoumean@1.2.2:
     resolution: {integrity: sha512-gxtyfqMg7GKyhQmb056K7M3xszy/myH8w+B4RT+QXBQsvAOdc3XymqDDPHx1BgPgsdAA5SIifona89YtRATDzw==}
     dev: true

src/lib/index.ts

@@ -1 +0,0 @@
-// place files you want to import through the `$lib` alias in this folder.

src/lib/indexedDB.ts

@@ -0,0 +1,30 @@
+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 },
+  ]);
+};

src/routes/(fullscreen)/auth/generateKey/service.ts

@@ -0,0 +1,57 @@
+import { storeKeyPairIntoIndexedDB } from "$lib/indexedDB";
+
+type KeyType = "public" | "private";
+
+const generateRSAKeyPair = async () => {
+  const keyPair = await window.crypto.subtle.generateKey(
+    {
+      name: "RSA-OAEP",
+      modulusLength: 4096,
+      publicExponent: new Uint8Array([1, 0, 1]),
+      hash: "SHA-256",
+    } satisfies RsaHashedKeyGenParams,
+    true,
+    ["encrypt", "decrypt"],
+  );
+  return keyPair;
+};
+
+const exportKeyAsPem = async (key: CryptoKey, type: KeyType) => {
+  const exportedKey = await window.crypto.subtle.exportKey(
+    type === "public" ? "spki" : "pkcs8",
+    key,
+  );
+  const exportedKeyBase64 = btoa(String.fromCharCode(...new Uint8Array(exportedKey)))
+    .match(/.{1,64}/g)!
+    .join("\n");
+
+  const pemHeader = type === "public" ? "PUBLIC" : "PRIVATE";
+  const pem = `-----BEGIN ${pemHeader} KEY-----\n${exportedKeyBase64}\n-----END ${pemHeader} KEY-----\n`;
+  return pem;
+};
+
+const makeRSAKeyNonextractable = async (key: CryptoKey, type: KeyType) => {
+  const format = type === "public" ? "spki" : "pkcs8";
+  const keyUsage = type === "public" ? "encrypt" : "decrypt";
+  return await window.crypto.subtle.importKey(
+    format,
+    await window.crypto.subtle.exportKey(format, key),
+    {
+      name: "RSA-OAEP",
+      hash: "SHA-256",
+    } satisfies RsaHashedImportParams,
+    false,
+    [keyUsage],
+  );
+};
+
+export const generateKeyPair = async () => {
+  const keyPair = await generateRSAKeyPair();
+
+  const privKeySecure = await makeRSAKeyNonextractable(keyPair.privateKey, "private");
+  await storeKeyPairIntoIndexedDB(keyPair.publicKey, privKeySecure);
+
+  const pubKeyPem = await exportKeyAsPem(keyPair.publicKey, "public");
+  const privKeyPem = await exportKeyAsPem(keyPair.privateKey, "private");
+  return { pubKeyPem, privKeyPem };
+};