Enrollment + almost all auth

lib/pairingCode.ts

@@ -0,0 +1,16 @@
+import { randomBytes } from "crypto";
+
+const PAIRING_ALPHABET = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789";
+
+export function generatePairingCode(length = 5) {
+  const bytes = randomBytes(length);
+  let code = "";
+  for (let i = 0; i < length; i += 1) {
+    code += PAIRING_ALPHABET[bytes[i] % PAIRING_ALPHABET.length];
+  }
+  return code;
+}
+
+export function normalizePairingCode(input: string) {
+  return input.trim().toUpperCase().replace(/[^A-Z0-9]/g, "");
+}