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。

1 import java.security.SecureRandom;
2 import java.util.Base64;
3
4 import javax.crypto.Cipher;
5 import javax.crypto.KeyGenerator;
6 import javax.crypto.SecretKey;
7 import javax.crypto.spec.SecretKeySpec;
8
9 public class javaaes {
10     public static void main(String[] args) throws Exception{
11         byte[] a = AesEncrypt("123456".getBytes(),"abcd1234");
12         System.out.println(new String(Base64.getEncoder().encodeToString(a)));
13     }
14     //AES加密
15     public static byte[] AesEncrypt(byte[] byteContent, String password) throws Exception {
16
17         KeyGenerator kgen = KeyGenerator.getInstance("AES");
18         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
19         secureRandom.setSeed(password.getBytes());
20         kgen.init(128, secureRandom);
21
22         SecretKey secretKey = kgen.generateKey();
23         byte[] enCodeFormat = secretKey.getEncoded();//AES加密实际的Key值
24         //如果直接enCodeFormat=password.getBytes(),那.NET直接就可以解密
25
26         SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
27
28         Cipher cipher = Cipher.getInstance("AES");
29
30         cipher.init(Cipher.ENCRYPT_MODE, key);
31         return cipher.doFinal(byteContent);
32     }
33     //AES解密
34     public static byte[] AesDecrypt(byte[] byteContent, String password) throws Exception {
35         KeyGenerator kgen = KeyGenerator.getInstance("AES");
36         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
37         secureRandom.setSeed(password.getBytes());
38         kgen.init(128, secureRandom);
39
40         SecretKey secretKey = kgen.generateKey();
41         byte[] enCodeFormat = secretKey.getEncoded();
42
43         SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
44         Cipher cipher = Cipher.getInstance("AES");
45         cipher.init(Cipher.DECRYPT_MODE, key);
46         return cipher.doFinal(byteContent);
47     }
48
49 }

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。

1     public static void main(String[] args) throws Exception{
2         String password = "1234567890";//AES的密钥
3         KeyGenerator kgen = KeyGenerator.getInstance("AES");
4         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
5         secureRandom.setSeed(password.getBytes());
6         kgen.init(128, secureRandom);
7
8         SecretKey secretKey = kgen.generateKey();
9         byte[] enCodeFormat = secretKey.getEncoded();//AES加密实际的Key值
10         System.out.println(new String(Base64.getEncoder().encodeToString(enCodeFormat)));
11     }

1         /// <summary>
2         /// AES解密
3         /// </summary>
4         /// <param name="data"></param>
5         /// <param name="key"></param>
6         /// <returns></returns>
7         public static string DeAES(byte[] content, string key)
8         {
9             using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
10             {
11                 aesProvider.Key = Convert.FromBase64String(key);
12                 aesProvider.Mode = CipherMode.ECB;
13                 aesProvider.Padding = PaddingMode.PKCS7;
14                 using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
15                 {
16                     byte[] inputBuffers = content;
17                     byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
18                     aesProvider.Clear();
19                     return Encoding.UTF8.GetString(results);
20                 }
21             }
22         }

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

1 using java.security;
2 using javax.crypto;
3 using System.Security.Cryptography;
4 using System.Text;
5 using System;
6
7 public class Program
8 {
9     public static void Main()
10     {
11         byte[] a = Convert.FromBase64String("W0fSdgixanavXMiDdPXa/Q==");
12         string result = DeAES(a, "abcd1234");
13         Console.WriteLine(result);
14         Console.Read();
15     }
16     /// <summary>
17     /// AES解密
18     /// </summary>
19     /// <param name="data"></param>
20     /// <param name="key"></param>
21     /// <returns></returns>
22     public static string DeAES(byte[] content, string key)
23     {
24         KeyGenerator kgen = KeyGenerator.getInstance("AES");
25         SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
26         secureRandom.setSeed(Encoding.ASCII.GetBytes(key));
27         kgen.init(128, secureRandom);
28         SecretKey secretKey = kgen.generateKey();
29         byte[] enCodeFormat = secretKey.getEncoded();
30
31         using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
32         {
33             aesProvider.Key = enCodeFormat;
34             aesProvider.Mode = CipherMode.ECB;
35             aesProvider.Padding = PaddingMode.PKCS7;
36             using (ICryptoTransform cryptoTransform = aesProvider.CreateDecryptor())
37             {
38                 byte[] inputBuffers = content;
39                 byte[] results = cryptoTransform.TransformFinalBlock(inputBuffers, 0, inputBuffers.Length);
40                 aesProvider.Clear();
41                 return Encoding.UTF8.GetString(results);
42             }
43         }
44     }
45
46 }

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