初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
1065 changed files with 101122 additions and 0 deletions
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+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:crypto/crypto.dart';
+import 'package:encrypt/encrypt.dart';
+
+/// 新版本解密（项目自定义协议：12 字节 nonce + sha256 派生 key/iv + AES-CBC）
+String aesDecryptEx(String cipher, String key) {
+  // final t1 = DateTime.now();
+  const nonceLen = 12;
+  final cipherBytes = base64Decode(cipher);
+  final nonce = cipherBytes.sublist(0, nonceLen);
+  final largeShaRaw = [...utf8.encode(key), ...nonce];
+  final largeShaRawMid = largeShaRaw.length ~/ 2;
+  final msgKeyLarge = sha256.convert(largeShaRaw).bytes;
+  final msgKey = msgKeyLarge.sublist(8, 24);
+
+  final shaRawA = [...msgKey, ...largeShaRaw.sublist(0, largeShaRawMid)];
+  final sha256a = sha256.convert(shaRawA).bytes;
+
+  final shaRawB = [...largeShaRaw.sublist(largeShaRawMid), ...msgKey];
+  final sha256b = sha256.convert(shaRawB).bytes;
+
+  final aesKey = [...sha256a.sublist(0, 8), ...sha256b.sublist(8, 24), ...sha256a.sublist(24)];
+
+  final aesIV = [...sha256b.sublist(0, 4), ...sha256a.sublist(12, 20), ...sha256b.sublist(28)];
+
+  final encrypter = Encrypter(AES(Key(Uint8List.fromList(aesKey)), mode: AESMode.cbc));
+  final decrypted = encrypter.decryptBytes(Encrypted(cipherBytes.sublist(nonceLen)), iv: IV(Uint8List.fromList(aesIV)));
+  final text = const Utf8Decoder().convert(decrypted);
+  return text;
+}