前言

? ? ? ? 正在做flutter版本的BLE项目的时候，发现flutter好多库不能实现Java 的这种 "AES/ECB/NoPadding" 方式的AES的加密，导致加密的报文和Java 的不一致，随机在网上找了好久终于找到了可以一个支持ECB 模式并且支持NoPadding填充模式的AES加密的库

一、Java版本对应的AES 加密

这个是java 版本的AES加密，基于ECB模式，并且使用了NoPadding方式填充。

public class AesUtil {
    private static final String TAG = "AesUtil";
    public static final byte[] key_oxo = 您的秘钥;
    public static byte[] Encrypt(byte[] sSrc) {
        try {
            SecretKeySpec skeySpec = new SecretKeySpec(key_oxo, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(sSrc);
            return encrypted;
        } catch (Exception ex) {
            ex.printStackTrace();
            Log.d(TAG, "ex: "+ex.getLocalizedMessage());
            return null;
        }
    }

    public static byte[] Decrypt(byte[] sSrc) {
        try {
            SecretKeySpec skeySpec = new SecretKeySpec(key_oxo, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] dncrypted = cipher.doFinal(sSrc);
            return dncrypted;
        } catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }
}

二、Flutter版本的AES加密和解密

1.引入库

? 比较火的库，比如encrypt并不支持NoPadding填充方式，下面这个库可以支持，在pubspec.yaml中引入下面的库? 对应的地址?encryptions | Flutter Package

encryptions: ^1.1.0+1

??

2.封装成加解密工具

import 'dart:typed_data';

import 'package:encryptions/encryptions.dart';
import 'package:convert/convert.dart';

class AesUtil {
  static List<int> key_oxo = 您的秘钥;

  /**
   * AES 加密
   */
  static Future<String> encryptData(final String originHex) async {
    Uint8List key = Uint8List.fromList(key_oxo);
    Uint8List plain = Uint8List.fromList(hex.decode(originHex));
    AES aes = AES.ofECB(key, PaddingScheme.NoPadding);
    Uint8List encrypted = await aes.encrypt(plain);
  
    String encryptHex = "";
    for (int i = 0; i < encrypted.length; i++) {
      String temp = encrypted[i].toRadixString(16);
      if (temp.length == 1) {
        temp = "0${temp}";
      }
      encryptHex = encryptHex + temp.toUpperCase();
    }
    return encryptHex;
  }

  /**
   * AES 解密
   */
  static Future<String> decryptData(final String originHex) async {
    Uint8List key = Uint8List.fromList(key_oxo);
    Uint8List plain = Uint8List.fromList(hex.decode(originHex));
    AES aes = AES.ofECB(key, PaddingScheme.NoPadding);
    Uint8List decrypted = await aes.decrypt(plain);
   
    String decryptHex = "";
    for (int i = 0; i < decrypted.length; i++) {
      String temp = decrypted[i].toRadixString(16);
      if (temp.length == 1) {
        temp = "0${temp}";
      }
      decryptHex = decryptHex + temp.toUpperCase();
    }
    return decryptHex;
  }

}

然后直接调用相应的方法就可以就行

 String result1 = await AesUtil.encryptData(hex1);
    print("hex1===${result1}");
    String result2 = await AesUtil.decryptData(hex2);
    print("hex2===${result2}");