因業務需求，需要使用AES加密演算法對傳輸資料進行加密解密操作。一端使用C#，一端使用Java，由於第一次接觸C#，在搜尋C#的AES演算法中是在痛苦從網頁到github。。。昨晚找到一點終於找到一個可以使用的。

Java

import org.apache.commons.codec.binary.Base64;
import sun.misc.BASE64Decoder;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

/**
 * @author: 已加密
 * @date: 2018/11/3
 * @instructions: AES加密
 */
public class AESEncryptUtils {
    /**
     * 加密 KEY 必須為 16 位
     */
    private static final String KEY = "1234567890000000";
    /**
     * charSet字符集編碼
     */
    private static final String charsetName = "utf-8";
    /**
     * 簽名演算法
     */
    public static final String SIGN_ALGORITHMS = "AES/ECB/PKCS5Padding";
    /**
     * 加密演算法
     */
    public static final String KEY_ALGORITHM = "AES";

    public static String aesEncrypt(String str) {
        if (str == null || KEY == null){
            throw new NullPointerException("加密內容或加密key不能為空");
        }

        try {
            Cipher cipher = Cipher.getInstance(SIGN_ALGORITHMS);
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(KEY.getBytes(charsetName), KEY_ALGORITHM));
            byte[] bytes = new byte[1024];
            bytes = cipher.doFinal(str.getBytes(charsetName));
            String result = Base64.encodeBase64String(bytes); /* 解決Base64加密換行問題 */
            return result;
        }catch (Exception e){
            e.printStackTrace();
        }
        return "加密失敗!";
    }

    public static String aesDecrypt(String str) {
        if (str == null || KEY == null) {
            throw new NullPointerException("解密內容或加密key不能為空");
        }

        try{
            Cipher cipher =  Cipher.getInstance(SIGN_ALGORITHMS);
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(KEY.getBytes(charsetName), KEY_ALGORITHM));
            byte[] bytes = new byte[1024];
            bytes = new BASE64Decoder().decodeBuffer(str);
            bytes = cipher.doFinal(bytes);
            return new String(bytes, charsetName);
        }catch (Exception e){
            e.printStackTrace();
        }
        return "解密失敗!";
    }

}

 

C#

using System;
using System.Security.Cryptography;
using System.Text;

namespace HelloWorldApplication
{
    class HelloWorld
    {

        public static string AesEncrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) 
                return null;

            Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);

            System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = System.Security.Cryptography.CipherMode.ECB,
                Padding = System.Security.Cryptography.PaddingMode.PKCS7
            };

            System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        /// <summary>
        ///  AES 解密
        /// </summary>
        /// <param name="str"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string AesDecrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) 
                return null;
                
            Byte[] toEncryptArray = Convert.FromBase64String(str);

            System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = System.Security.Cryptography.CipherMode.ECB,
                Padding = System.Security.Cryptography.PaddingMode.PKCS7
            };

            System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Encoding.UTF8.GetString(resultArray);
        }
    }

    class my{
        public static void Main(string[] args)
        {
           
                Console.WriteLine(HelloWorld.AesEncrypt("你好","1234567890000000") );
                Console.ReadKey();
        }
    }

}