C# 实现 JAVA AES加密解密[原创]

以下是网上普遍能收到的JAVA AES加密解密方法。

因为里面用到了KeyGenerator 和 SecureRandom，但是.NET 里面没有这2个类。无法使用安全随机数生成KEY。

我们在接收JAVA发送的AES加密字符串后，在.NET没有对应的KeyGenerator 和 SecureRandom去生成AES 的 KEY值，导致无法直接解密。

 import java.security.SecureRandom;
 import java.util.Base64;

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

 public class javaaes {
     public static void main(String[] args) throws Exception{
         byte[] a = AesEncrypt("123456".getBytes(),"abcd1234");
         System.out.println(new String(Base64.getEncoder().encodeToString(a)));
     }
     //AES加密
     public static byte[] AesEncrypt(byte[] byteContent, String password) throws Exception {

         KeyGenerator kgen = KeyGenerator.getInstance("AES");
         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
         secureRandom.setSeed(password.getBytes());
         kgen.init(128, secureRandom);

         SecretKey secretKey = kgen.generateKey();
         byte[] enCodeFormat = secretKey.getEncoded();//AES加密实际的Key值
         //如果直接enCodeFormat=password.getBytes(),那.NET直接就可以解密

         SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");

         Cipher cipher = Cipher.getInstance("AES");

         cipher.init(Cipher.ENCRYPT_MODE, key);
         return cipher.doFinal(byteContent);
     }
     //AES解密
     public static byte[] AesDecrypt(byte[] byteContent, String password) throws Exception {
         KeyGenerator kgen = KeyGenerator.getInstance("AES");
         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
         secureRandom.setSeed(password.getBytes());
         kgen.init(128, secureRandom);

         SecretKey secretKey = kgen.generateKey();
         byte[] enCodeFormat = secretKey.getEncoded();

         SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
         Cipher cipher = Cipher.getInstance("AES");
         cipher.init(Cipher.DECRYPT_MODE, key);
         return cipher.doFinal(byteContent);
     }

 }

第一种方法是，在JAVA中将AES的密钥直接生成出实际的key值，在.NET中用这个实际的key去解密。

     public static void main(String[] args) throws Exception{
         String password = "1234567890";//AES的密钥
         KeyGenerator kgen = KeyGenerator.getInstance("AES");
         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
         secureRandom.setSeed(password.getBytes());
         kgen.init(128, secureRandom);

         SecretKey secretKey = kgen.generateKey();
         byte[] enCodeFormat = secretKey.getEncoded();//AES加密实际的Key值
         System.out.println(new String(Base64.getEncoder().encodeToString(enCodeFormat)));
     }

         /// <summary>
         /// AES解密
         /// </summary>
         /// <param name="data"></param>
         /// <param name="key"></param>
         /// <returns></returns>
         public static string DeAES(byte[] content, string key)
         {
             using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
             {
                 aesProvider.Key = Convert.FromBase64String(key);
                 aesProvider.Mode = CipherMode.ECB;
                 aesProvider.Padding = PaddingMode.PKCS7;
                 using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
                 {
                     byte[] inputBuffers = content;
                     byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, , inputBuffers.Length);
                     aesProvider.Clear();
                     return Encoding.UTF8.GetString(results);
                 }
             }
         }

第二种方法是，下载IKVM，解压缩后在VS的项目中引用bin目录下的IKVM.Runtime.dll、IKVM.OpenJDK.Core.dll、IKVM.OpenJDK.Security.dll

 using java.security;
 using javax.crypto;
 using System.Security.Cryptography;
 using System.Text;
 using System;

 public class Program
 {
     public static void Main()
     {
         byte[] a = Convert.FromBase64String("W0fSdgixanavXMiDdPXa/Q==");
         string result = DeAES(a, "abcd1234");
         Console.WriteLine(result);
         Console.Read();
     }
     /// <summary>
     /// AES解密
     /// </summary>
     /// <param name="data"></param>
     /// <param name="key"></param>
     /// <returns></returns>
     public static string DeAES(byte[] content, string key)
     {
         KeyGenerator kgen = KeyGenerator.getInstance("AES");
         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
         secureRandom.setSeed(Encoding.ASCII.GetBytes(key));
         kgen.init(, secureRandom);
         SecretKey secretKey = kgen.generateKey();
         byte[] enCodeFormat = secretKey.getEncoded();

         using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
         {
             aesProvider.Key = enCodeFormat;
             aesProvider.Mode = CipherMode.ECB;
             aesProvider.Padding = PaddingMode.PKCS7;
             using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
             {
                 byte[] inputBuffers = content;
                 byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, , inputBuffers.Length);
                 aesProvider.Clear();
                 return Encoding.UTF8.GetString(results);
             }
         }
     }

 }

下载地址：https://github.com/zhu-xb/AES-Cryptography