// ignore_for_file: constant_identifier_names

import 'dart:convert';

import 'package:dart_des/dart_des.dart';
import 'package:dart_sm/dart_sm.dart';
import 'package:encrypt/encrypt.dart';
import 'package:hex/hex.dart';
import 'package:pointycastle/asymmetric/api.dart';

/// JSON-RPC 加密配置
class JsonRpcEncryptConfig {
  /// 是否启用
  final bool enable;

  /// 加密方式
  final String encryptMode;

  /// 秘钥
  final String encryptKey;

  JsonRpcEncryptConfig({
    this.enable = false,
    this.encryptMode = "sm2",
    this.encryptKey = "",
  });

  Map<String, dynamic> toJson() {
    return {
      "enable": enable,
      "encryptMode": encryptMode,
      "encryptKey": encryptKey,
    };
  }
}

abstract class JsonRpcEncryptUtils {
  /// RSA公钥
  static const _RSA_PUB_KEY = "-----BEGIN PUBLIC KEY-----\n"
          "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAln7CnpiqYguFVRUL5oCdFAQL6ypYQdnd84XN++mRvjkdjtpbCdGEj6S2U2Vn+Bt+vHL5bvUk6gtTx5FpV0Z8kDvDgBRweIvtJTZLx6ZjbI7habxclW9aB3b0SW3zuFuHMteDivTI0lkZ6y0QRiG7nMZYsi18IjReBssXsx38fpgIBAHIbkb98wtEffBbrbwfdxQnfc8r9Hy7iIbfVP0h7nR0FDMu1vYqi5PsnYDw681iO6GNxV6VHA6wcWkMokLZn51OP+OQmomJPElWfPgLDp1AxBeRhuHFlXslcE550bzWUs3iBylTgXwdTGqppCjCXhSLBiOnTc0ggHpDQHh17wIDAQAB\n" +
      "-----END PUBLIC KEY-----";

  /// RSA加密
  static String rsaEncrypt(String message) {
    final publicKey = RSAKeyParser().parse(_RSA_PUB_KEY) as RSAPublicKey;
    final encrypter = Encrypter(RSA(publicKey: publicKey));
    // Encrypt the message using RSA-OAEP encryption
    final encrypted = encrypter.encrypt(message);
    final encryptedText = encrypted.base64;
    return encryptedText;
  }

  /// DES解密
  static String desDecrypt(String ciphertext, String key) {
    // IV
    const List<int> iv = [1, 2, 3, 4, 5, 6, 7, 8];
    final ivHexString = String.fromCharCodes(iv);
    final ivString = utf8.encode(ivHexString);

    final DES desCBC = DES(
      key: key.codeUnits,
      mode: DESMode.CBC,
      iv: ivString,
      paddingType: DESPaddingType.PKCS7,
    );

    final ciphertextHexDecoded = HEX.decode(ciphertext);
    final decryptedBytes = desCBC.decrypt(ciphertextHexDecoded);
    final decryptedString = utf8.decode(decryptedBytes);
    return decryptedString;
  }

  /// 国密2加密
  static String sm2Encrypt(String message, String key) {
    // 1 - C1C3C2；	0 - C1C2C3；	默认为1
    const int cipherMode = 1; // 特别注意,此处前后端需保持一致

    // 加密结果
    String encryptData = SM2.encrypt(message, key, cipherMode: cipherMode);
    // 加密后的密文前需要添加04，后端才能正常解密
    encryptData = "04$encryptData";
    return encryptData;
  }

  /// 国密4解密
  static String sm4Decrypt(String cipherText, String key) {
    return SM4.decrypt(cipherText, key: key);
  }
}