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, 0, 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.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(128, 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, 0, inputBuffers.Length);
                aesProvider.Clear();
                return Encoding.UTF8.GetString(results);
            }
        }
    }

}