46 lines
1.3 KiB
Dart
46 lines
1.3 KiB
Dart
import 'dart:convert';
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import 'dart:math';
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import 'package:encrypt/encrypt.dart';
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import 'api_config.dart';
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/// AES-128-ECB 加解密
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abstract final class ApiCrypto {
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static final _key = Key.fromUtf8(ApiConfig.aesKey);
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static final _encrypter = Encrypter(
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AES(
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_key,
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mode: AESMode.ecb,
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padding: 'PKCS7',
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),
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);
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/// AES 加密，返回 Base64 字符串
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static String encrypt(String plainText) {
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final encrypted = _encrypter.encrypt(plainText);
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return encrypted.base64;
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}
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/// AES 解密，输入 Base64 字符串
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static String decrypt(String base64Cipher) {
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final encrypted = Encrypted.fromBase64(base64Cipher);
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return _encrypter.decrypt(encrypted);
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}
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/// 生成随机 Base64 字符串（用于噪音字段）
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/// 使用 Random.secure() 保证密码学安全随机性
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static String randomBase64([int byteLength = 16]) {
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final random = Random.secure();
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final bytes = List<int>.generate(byteLength, (_) => random.nextInt(256));
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return base64Encode(bytes);
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}
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/// 生成 8 位随机字母数字
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static String randomAlnum() {
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const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
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return List.generate(8, (_) => chars[DateTime.now().microsecondsSinceEpoch % chars.length]).join();
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}
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}
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