记一次Java AES 加解密对应C# AES加解密的一波三折

最近在跟三方对接对方采用AES加解密作为一个资深neter Ctrl CV 是我最大的优点所以我义正言辞的问他们要了demo

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java demo代码：

public class EncryptDecryptTool
{private static final String defaultCharset = "UTF-8";private static final String KEY_AES = "AES";private static final String KEY_MD5 = "MD5";private static MessageDigest md5Digest;static {try {md5Digest = MessageDigest.getInstance(KEY_MD5);} catch (NoSuchAlgorithmException e) {//}}public String encrypt(String message, String key) throws Exception
{return doAES(message, key, Cipher.ENCRYPT_MODE);
}public String decrypt(String message, String key) throws Exception
{return doAES(message, key, Cipher.DECRYPT_MODE);
}/*** 加解密** @param data* @param key* @param mode* @return* @throws NoSuchPaddingException * @throws NoSuchAlgorithmException */
private static String doAES(String data, String key, int mode) throws Exception
{if (StringUtils.isBlank(data) || StringUtils.isBlank(key)) {return null;}boolean encrypt = mode == Cipher.ENCRYPT_MODE;byte[]content;if (encrypt) {content = data.getBytes(defaultCharset);} else {content = Base64.decodeBase64(data.getBytes());}SecretKeySpec keySpec = new SecretKeySpec(md5Digest.digest(key.getBytes(defaultCharset)), KEY_AES);Cipher cipher = Cipher.getInstance(KEY_AES);// 创建密码器
cipher.init(mode, keySpec);// 初始化byte[] result = cipher.doFinal(content);if (encrypt) {return new String(Base64.encodeBase64(result, false), defaultCharset);} else {return new String(result, defaultCharset);}}
}EncryptDecryptTool tool = new EncryptDecryptTool();try{//这里key的位数是个坑   之前找的一堆资料   java C#通用版啥的   都说key一定要是16位的   结果后来我发现 靠String msg = tool.decrypt("{\"Name\":\"20180122T155221\",\"OrderNo\":\"Test1000012059021180000008153\"}", "64个英文字母");System.out.println(msg);}catch (Exception e){// TODO Auto-generated catch blocke.printStackTrace();}

哇咔咔这不是大名鼎鼎的java嘛但这难不倒我不是还有IKVM 照样Ctrl CV

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新建一个.NET Standard项目NuGet 安装IKVM

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C#主要代码

public class EncryptDecryptTool{private static readonly string KEY_AES = "AES";private static readonly string KEY_MD5 = "MD5";private static MessageDigest md5Digest;static EncryptDecryptTool(){try{md5Digest = MessageDigest.getInstance(KEY_MD5);}catch (NoSuchAlgorithmException e){//}}public string encrypt(string message, string key){return doAES(message, key, Cipher.ENCRYPT_MODE);}public string decrypt(string message, string key){return doAES(message, key, Cipher.DECRYPT_MODE);}/// <summary>/// /// </summary>/// <param name="data"></param>/// <param name="key"></param>/// <param name="mode"></param>/// <returns></returns>private static string doAES(string data, string key, int mode){bool encrypt = mode == Cipher.ENCRYPT_MODE;byte[] content;if (encrypt){content = Encoding.UTF8.GetBytes(data);}else{content = Convert.FromBase64String(data);}SecretKeySpec keySpec = new SecretKeySpec(md5Digest.digest(Encoding.UTF8.GetBytes(key)), KEY_AES);Cipher cipher = Cipher.getInstance(KEY_AES);// 创建密码器cipher.init(mode, keySpec);// 初始化byte[] result = cipher.doFinal(content);if (encrypt){return Convert.ToBase64String(result);}else{return Encoding.UTF8.GetString(result);}}}static void Main(string[] args){var encryptDecryptTool = new EncryptDecryptTool();Console.WriteLine(encryptDecryptTool.encrypt("jack","64位密钥"));}

运行NetCore控制台

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这是Net Framework Net Core以及IKVM不得不说的故事了但是下午就要联调了总不能给三方讲一千零一夜没事这难不倒我新建一个Net Framework控制台

   static void Main(string[] args){try{var argsLength = args.Length;if (argsLength > 1){EncryptDecryptTool tool = new EncryptDecryptTool();string result = string.Empty;if (args[0] == "encrypt"){result = tool.encrypt(args[1]);}else{result = tool.decrypt(args[1]);}Console.WriteLine(result);}}catch (Exception ex){Console.WriteLine(ex.Message);}}

Net Core调用

      string path = @"D:\WebSite\AESTool.exe";var method="encrypt";var msg="this is msg";string fileName = path;Process p = new Process();p.StartInfo.UseShellExecute = false;p.StartInfo.RedirectStandardOutput = true;p.StartInfo.FileName = fileName;p.StartInfo.CreateNoWindow = true;p.StartInfo.Arguments = $"{method} {msg}";//参数以空格分隔p.Start();var output = await p.StandardOutput.ReadToEndAsync();

测试ok 没问题就是时间有点久加密解密每次差不多都要一秒

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就这样跑了一段时间今天闲下来想起上次的一秒

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嗯写好辞职申请备份好的我要开始重构了嗯知己知彼百战不殆那我们先去维密上大概了解一下AES

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好吧我知道你也没看懂

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我们还是看代码吧作为一个资深程序员的直觉

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之前查了一堆资料都说java C# AES加解密通用版 key的位都必须是16位害的笨菜鸟陷入了思维误区我们再看上面那段代码 Debug进去看发现是用MD5算法根据key生成长度16的byte数据 16啊多么敏感的数字就是哈希计算靠

果断google，Ctrl CV

  public static class EncryptDecryptTool{private const string key = "qCOHfwhXgsZFBFSeZeGOlXtZbKOzApLBuZoWxrQjcmoxYHfrWZzdyFbvGuMcZqmC";/// <summary>/// MD5哈希计算/// </summary>/// <param name="key"></param>/// <returns></returns>public static byte[] ConvertStringToMD5(string key){byte[] ByteData = Encoding.UTF8.GetBytes(key);MD5 oMd5 = MD5.Create();       byte[] HashData = oMd5.ComputeHash(ByteData);return HashData;}/// <summary>/// AES加密 /// </summary>/// <param name="toEncrypt"></param>/// <returns></returns>public static string Encrypt(string toEncrypt){byte[] keyArray = ConvertStringToMD5(key);byte[] toEncryptArray = Encoding.UTF8.GetBytes(toEncrypt);RijndaelManaged rDel = new RijndaelManaged();rDel.Key = keyArray;rDel.Mode = CipherMode.ECB;rDel.Padding = PaddingMode.PKCS7;ICryptoTransform cTransform = rDel.CreateEncryptor();byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Convert.ToBase64String(resultArray, 0, resultArray.Length);}/// <summary>/// AES解密/// </summary>/// <param name="toDecrypt"></param>/// <returns></returns>public static string Decrypt(string toDecrypt){byte[] keyArray = ConvertStringToMD5(key);byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);RijndaelManaged rDel = new RijndaelManaged();rDel.Key = keyArray;rDel.Mode = CipherMode.ECB;rDel.Padding = PaddingMode.PKCS7;ICryptoTransform cTransform = rDel.CreateDecryptor();byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Encoding.UTF8.GetString(resultArray);}