Java与C#通讯中的AES加密

背景

AES（高级加密标准：Advanced Encryption Standard)加密是一种对称的加密方式，用来替代原先的DES。

在此，将会介绍Java与C#在通讯过程中的对文本字符串的加密操作，分别对Java中的AES和C#中的AES加密进行说明，同时，当Java对文本进行加密后，C#能够根据相同的加密规则对文本进行解密，反之，亦然。
本文将会采用AES的ECB模式进行加密，填充方式为PKCS5Padding，加密的密码必须为16位。编码方式统一使用UTF-8

  • Java AES加密中的ECB加密模式对应于C#中的System.Security.Cryptography.CipherMode.ECB模式;
  • Java中的PKCS5Padding填充方式，对应于C#中的System.Security.Cryptography.PaddingMode.PKCS7;

Java中的AES加密

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import org.apache.commons.lang3.StringUtils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
/**
 * Created by child on 2016/4/9.
 * <p/>
 * AES 加密/解密
 */
@SuppressWarnings("restriction")
public class AESEncryptUtil {
	public static String encrypt(String content, String key) throws Exception {
	    if (StringUtils.isBlank(content) || StringUtils.isBlank(key)) {
	        return null;
	    }
	
	    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
	    cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key.getBytes("utf-8"), "AES"));
	    byte[] bytes = cipher.doFinal(content.getBytes("utf-8"));
	    return new BASE64Encoder().encode(bytes);
	}
	
	public static String decrypt(String content, String key) throws Exception {
	    if (StringUtils.isBlank(content) || StringUtils.isBlank(key)) {
	        return null;
	    }
	
	    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
	    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key.getBytes("utf-8"), "AES"));
	    byte[] bytes = new BASE64Decoder().decodeBuffer(content);
	    bytes = cipher.doFinal(bytes);
	    return new String(bytes, "utf-8");
	}
	
	public static void main(String[] args) {
	    try {
			String content = "helloworld";
            String password = "1234567891234567";
            String result = encrypt(content, password);
            System.out.println(result);
            System.out.println(decrypt(result, password));
	    } catch (Exception e) {
	        e.printStackTrace();
	    }
}

C#中的AES加密

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using System;
using System.Security.Cryptography;
using System.Text;
namespace Util.Encrypt
{
		// AES 加密
        public static string encrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str);
            System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = System.Security.Cryptography.CipherMode.ECB,
                Padding = System.Security.Cryptography.PaddingMode.PKCS7
            };
            System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateEncryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        // AES 解密
        public static string decrypt(string str, string key)
        {
            if (string.IsNullOrEmpty(str)) return null;
            Byte[] toEncryptArray = Convert.FromBase64String(str);
            System.Security.Cryptography.RijndaelManaged rm = new System.Security.Cryptography.RijndaelManaged
            {
                Key = Encoding.UTF8.GetBytes(key),
                Mode = System.Security.Cryptography.CipherMode.ECB,
                Padding = System.Security.Cryptography.PaddingMode.PKCS7
            };
            System.Security.Cryptography.ICryptoTransform cTransform = rm.CreateDecryptor();
            Byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
            return Encoding.UTF8.GetString(resultArray);
        }
    }
}