From 51d0e60cf1aa56862b1b3cf680626015a07e5871 Mon Sep 17 00:00:00 2001
From: shuaiplus <2327005759@qq.com>
Date: Thu, 12 Mar 2026 02:28:19 +0800
Subject: [PATCH] refactor: improve base32 normalization function for better
 readability and performance

---
 src/utils/totp.ts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/utils/totp.ts b/src/utils/totp.ts
index f013630..48e9c10 100644
--- a/src/utils/totp.ts
+++ b/src/utils/totp.ts
@@ -3,7 +3,16 @@ const TOTP_DIGITS = 6;
 const TOTP_WINDOW = 1; // allow previous/current/next step for small clock drift
 
 function normalizeBase32(input: string): string {
-  return input.toUpperCase().replace(/[\s-]/g, '').replace(/=+$/g, '');
+  const raw = String(input || '').toUpperCase();
+  let out = '';
+  for (const char of raw) {
+    if (char === ' ' || char === '\t' || char === '\n' || char === '\r' || char === '-') continue;
+    out += char;
+  }
+  while (out.endsWith('=')) {
+    out = out.slice(0, -1);
+  }
+  return out;
 }
 
 function base32Decode(input: string): Uint8Array | null {