AES Java加密 C#解密 (128-ECB加密模式)

在項目中遇到這麼一個問題：

java端須要把一些數據AES加密後傳給C#端，找了好多資料，算是解決了，分享一下：

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.SecureRandom;

public class AesEncodeUtil {
  
  private final static String transferKey ="qazwsxedcrfv12345";

  public static void main(String[] args) throws Exception {


    String a = aesTransferEncrypt("QAZwsx123!@#$%^&*");
    System.out.println(a);
    System.out.println(aesTransferDncrypt(a));

  }

  /**
   * 傳輸用加密
   * @param content
   * @return
   * @throws Exception
   */
  public static String aesTransferEncrypt(String content) throws Exception {
    return base64Encode(aesEncryptToBytes(content, transferKey));
  }

  /**
   * 傳輸用解密
   * @param content
   * @return
   * @throws Exception
   */
  public static String aesTransferDncrypt(String encryptStr) throws Exception {
    return aesDecryptByBytes(base64Decode(encryptStr), transferKey);
  }

  /**
   * base 64 encode
   * @param bytes 待編碼的byte[]
   * @return 編碼後的base 64 code
   */
  private static String base64Encode(byte[] bytes) {
    return new BASE64Encoder().encode(bytes);
  }

  /**
   * base 64 decode
   * @param base64Code 待解碼的base 64 code
   * @return 解碼後的byte[]
   * @throws Exception
   */
  private static byte[] base64Decode(String base64Code) throws Exception {
    return new BASE64Decoder().decodeBuffer(base64Code);
  }

  /**
   * AES加密
   * @param content 待加密的內容
   * @param encryptKey 加密密鑰
   * @return 加密後的byte[]
   * @throws Exception
   */
  private static byte[] aesEncryptToBytes(String content, String encryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    secureRandom.setSeed(encryptKey.getBytes());
    kgen.init(128, secureRandom);
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, kgen.generateKey());
    return cipher.doFinal(content.getBytes("UTF-8"));
  }

  /**
   * AES解密
   * @param encryptBytes 待解密的byte[]
   * @param decryptKey 解密密鑰
   * @return 解密後的String
   * @throws Exception
   */
  private static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );
    secureRandom.setSeed(decryptKey.getBytes());
    kgen.init(128, secureRandom);
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE,kgen.generateKey());
    byte[] decryptBytes = cipher.doFinal(encryptBytes);
    return new String(decryptBytes,"UTF-8");
  }
}

java代碼加密/解密運行結果：

加密結果:BKscOr7eK4jTO5Hcw5oxqS8HWg2SRhtGfMctz8t/45g=
解密結果:QAZwsx123!@#$%^&*

再看看C#代碼：

/// <summary>
        /// AES加密 (128-ECB加密模式)
        /// </summary>
        /// <param name="toEncrypt">內容</param>
        /// <param name="key">祕鑰</param>
        /// <returns></returns>
        public static string AESEncrypt(string toEncrypt, string key)
        {
            byte[] keyArray = Convert.FromBase64String(key);
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(toEncrypt);

            RijndaelManaged rDel = new RijndaelManaged();
            rDel.Key = keyArray;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = rDel.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }
        /// <summary>
        /// AES解密(128-ECB加密模式)
        /// </summary>
        /// <param name="toDecrypt">密文</param>
        /// <param name="key">祕鑰(Base64String)</param>
        /// <returns></returns>
        public static string AESDecrypt(string toDecrypt, string key)
        {
            try
            {
                byte[] keyArray = Convert.FromBase64String(key); //128bit
                byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
                RijndaelManaged rDel = new RijndaelManaged();
                rDel.Key = keyArray; //獲取或設置對稱算法的密鑰
                rDel.Mode = CipherMode.ECB; //獲取或設置對稱算法的運算模式，必須設置爲ECB  
                rDel.Padding = PaddingMode.PKCS7; //獲取或設置對稱算法中使用的填充模式，必須設置爲PKCS7  
                ICryptoTransform cTransform = rDel.CreateDecryptor(); //用當前的 Key 屬性和初始化向量 (IV) 建立對稱解密器對象
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
                return Encoding.UTF8.GetString(resultArray);
            }
            catch
            {
                return null;
            }
        }

 

 

可是若是直接把 transferKey ="qazwsxedcrfv12345" 和 加密結果:BKscOr7eK4jTO5Hcw5oxqS8HWg2SRhtGfMctz8t/45g=

給C#，C#是沒法解密的，由於 rDel.Key = keyArray; 會報錯。

 

那麼怎麼辦呢？ 其實咱們要把transferKey ="qazwsxedcrfv12345" 處理下，

import java.security.NoSuchAlgorithmException;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import sun.misc.BASE64Encoder;

public class t1 {

public static void main(String[] args) throws NoSuchAlgorithmException {
String transferKey ="bt龘靐麷鸜鬱nm018讟虋纞idnwtyaTN灩厵麷鸜鬱驪NkkdTnd11_!@$齽齼鼺黸TTASdg212c驫饢籱21_djTdj";
KeyGenerator kgen = KeyGenerator.getInstance("AES");
java.security.SecureRandom random = java.security.SecureRandom.getInstance("SHA1PRNG");
random.setSeed(transferKey.getBytes());
kgen.init(128, random);
SecretKey secretKey = kgen.generateKey();
byte[] enCodeFormat = secretKey.getEncoded();
BASE64Encoder coder = new BASE64Encoder();

System.out.println(coder.encode(enCodeFormat));

}

}

運行結果：0UkIZmHsXb0BUql/L3R6Aw== 纔是C#須要的key

 

看看C#調用及結果：

 

 

 以上只是一個簡單的示例。