import 'dart:convert';
import 'dart:typed_data';
import 'package:encrypt/encrypt.dart';


class CryptData {
  final Uint8List _byte;

  CryptData(Uint8List byte) : _byte = byte;
  CryptData.fromUtf8(String base64data) : _byte = base64Decode(base64data);
  CryptData.fromBase64(String base64data) : _byte = base64Decode(base64data);
  CryptData.fromHex(String hexData) : _byte = decodeHexString(hexData);

  Uint8List get byte => _byte;
  String get base64 => base64Encode(_byte);
}

class EncryptedAesCbc {
  final CryptData iv;
  final CryptData encrypted;

  EncryptedAesCbc({
    required this.iv,
    required this.encrypted,
  });

  EncryptedAesCbc.fromBase64({
    required String base64iv,
    required String base64encrypted,
  }) : iv = CryptData.fromBase64(base64iv), encrypted = CryptData.fromBase64(base64encrypted);

}

EncryptedAesCbc encryptAesCbc(String plainText, CryptData password) {
  final iv = IV.fromLength(16); // AES-CBC 必需的16字节IV
  final key = Key(password.byte);
  final encrypter = Encrypter(AES(key, mode: AESMode.cbc));

  final encrypted = encrypter.encrypt(plainText, iv: iv);

  return EncryptedAesCbc(iv: CryptData(iv.bytes), encrypted: CryptData(encrypted.bytes));
}


String decryptAesCbc(EncryptedAesCbc encrypted, CryptData password) {
  final iv = IV(encrypted.iv.byte);
  final key = Key(password.byte);
  final encrypter = Encrypter(AES(key, mode: AESMode.cbc));

  final decrypted = encrypter.decrypt(Encrypted(encrypted.encrypted.byte), iv: iv);

  return decrypted;
}