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lib/utils/crypto.dart

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+import 'dart:convert';
+
+/// 与 uniApp 端 utils/crypto.js 完全一致的密码混淆算法（XOR + Base64）。
+/// 注意：仅防明文存储，非强加密。
+const String _secretKey = 'QIANGBAO_AI_JIZHANG_2024';
+
+String encryptPassword(String password) {
+  if (password.isEmpty) return '';
+  final chars = password.codeUnits;
+  final keyUnits = _secretKey.codeUnits;
+  final encrypted = String.fromCharCodes([
+    for (var i = 0; i < chars.length; i++) chars[i] ^ keyUnits[i % keyUnits.length],
+  ]);
+  return base64Encode(utf8.encode(encrypted));
+}
+
+String decryptPassword(String encrypted) {
+  if (encrypted.isEmpty) return '';
+  try {
+    final decoded = utf8.decode(base64Decode(encrypted));
+    final chars = decoded.codeUnits;
+    final keyUnits = _secretKey.codeUnits;
+    return String.fromCharCodes([
+      for (var i = 0; i < chars.length; i++) chars[i] ^ keyUnits[i % keyUnits.length],
+    ]);
+  } catch (_) {
+    return '';
+  }
+}