feat: add native KDBX scaffolding and in-memory KeePass API

src/kdbx/crypto.ts

@@ -0,0 +1,15 @@
+import { createHash, pbkdf2Sync } from "node:crypto";
+
+export function sha256(data: Uint8Array | string): Uint8Array {
+	const hash = createHash("sha256");
+	hash.update(data);
+	return new Uint8Array(hash.digest());
+}
+
+export function deriveKey(password: string, salt: Uint8Array, rounds: number, length = 32): Uint8Array {
+	if (!Number.isFinite(rounds) || rounds <= 0) {
+		throw new Error("Invalid key derivation rounds");
+	}
+
+	return new Uint8Array(pbkdf2Sync(password, Buffer.from(salt), rounds, length, "sha256"));
+}