AES加密和解密，JAVA和C#代码互转，无偏移量

一、Java的AES加密解密代码

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class AesEncryptionUtil {
    private static final String ALGORITHM = "AES/ECB/PKCS5Padding";
    private static final String SECRET_KEY = "b6bd4cf968a241e2";

    public static String encrypt(String plainText) throws Exception {
        byte[] keyBytes = SECRET_KEY.getBytes(StandardCharsets.UTF_8);
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, keySpec);

        byte[] encrypted = cipher.doFinal(plainText.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(encrypted);
    }
    public static String decrypt(String encryptedText) throws Exception {
        byte[] keyBytes = SECRET_KEY.getBytes(StandardCharsets.UTF_8);
        SecretKeySpec keySpec = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, keySpec);

        byte[] decodedBytes = Base64.getDecoder().decode(encryptedText);
        byte[] decrypted = cipher.doFinal(decodedBytes);
        return new String(decrypted, StandardCharsets.UTF_8);
    }
    public static void main(String[] args) throws Exception {
        String str = encrypt("abc");
        System.out.println(str);
        String str1 = decrypt(str);
        System.out.println(str1);
    }
}

菜鸟工具上执行效果

 

二、C#加密解密代码

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace HelloWorldApplication
{
   class HelloWorld
   {
      static void Main(string[] args)
      {
         /* Write C# code in this online editor and run it. */
         string key="b6bd4cf968a241e2";
         string enStr= AESEncrypt.Encrypt("abc",key);
         Console.WriteLine(enStr);
          string deStr= AESEncrypt.DecryptByAES(enStr,key);
         Console.WriteLine(deStr);
         Console.ReadKey();
      }
   }
    public class AESEncrypt
{

    /// <summary>
    /// 加密不带偏移量
    /// </summary>
    /// <param name="input"></param>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string Encrypt(string input, string key)
    {
        if (string.IsNullOrWhiteSpace(input) || string.IsNullOrWhiteSpace(key))
        {
            return input;
        }
        using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
        {
            rijndaelManaged.Mode = CipherMode.ECB;
            rijndaelManaged.Padding = PaddingMode.PKCS7;
            rijndaelManaged.FeedbackSize = 128;

            rijndaelManaged.Key = Encoding.UTF8.GetBytes(key);

            ICryptoTransform encryptor = rijndaelManaged.CreateEncryptor(rijndaelManaged.Key, rijndaelManaged.IV);
            using (MemoryStream msEncrypt = new MemoryStream())
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
                {
                    using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
                    {
                        swEncrypt.Write(input);
                    }
                    byte[] bytes = msEncrypt.ToArray();
                    return Convert.ToBase64String(bytes);
                }
            }
        }
    }

    /// <summary>  
    /// AES解密  
    /// </summary>  
    /// <param name="input">密文字节数组</param>  
    /// <returns>返回解密后的字符串</returns>  
    public static string DecryptByAES(string input, string key)
    {
        if (string.IsNullOrWhiteSpace(input) || string.IsNullOrWhiteSpace(key))
        {
            return input;
        }
        var buffer = Convert.FromBase64String(input);
        using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
        {
            rijndaelManaged.Mode = CipherMode.ECB;
            rijndaelManaged.Padding = PaddingMode.PKCS7;
            rijndaelManaged.FeedbackSize = 128;
            rijndaelManaged.Key = Encoding.UTF8.GetBytes(key);

            ICryptoTransform decryptor = rijndaelManaged.CreateDecryptor(rijndaelManaged.Key, rijndaelManaged.IV);
            using (MemoryStream msEncrypt = new MemoryStream(buffer))
            {
                using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srEncrypt = new StreamReader(csEncrypt))
                    {
                        return srEncrypt.ReadToEnd();
                    }
                }
            }
        }
    }
}
}

菜鸟工具执行效果：

 

三、注意事项

1.key位数：16位。

2.加密模式要对应，可以切换其他模式。Java：AES/ECB/PKCS5Padding，C#：CipherMode.ECB/PaddingMode.PKCS7

3.这里是一种没有偏移量的写法，有偏移量就加上偏移量。