AES Java加密 C#解密 (128-ECB加密模式)

在项目中遇到这么一个问题：

java端需要把一些数据AES加密后传给C#端，找了好多资料，算是解决了，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));

}

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

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

/**
* base 64 encode
* @param bytes 待编码的byte[]
* @return 编码后的base 64 code
*/
private static String base64Encode(byte[] bytes) {
return new BASE64Encoder().encode(bytes);
}

/**
* base 64 decode
* @param base64Code 待解码的base 64 code
* @return 解码后的byte[]
* @throws Exception
*/
private static byte[] base64Decode(String base64Code) throws Exception {
return new BASE64Decoder().decodeBuffer(base64Code);
}

/**
* AES加密
* @param content 待加密的内容
* @param encryptKey 加密密钥
* @return 加密后的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 解密密钥
* @return 解密后的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代码加密/解密运行结果：

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

再看看C#代码：

/// <summary>
/// AES加密 (128-ECB加密模式)
/// </summary>
/// <param name="toEncrypt">内容</param>
/// <param name="key">秘钥</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">秘钥(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; //获取或设置对称算法的密钥
rDel.Mode = CipherMode.ECB; //获取或设置对称算法的运算模式，必须设置为ECB
rDel.Padding = PaddingMode.PKCS7; //获取或设置对称算法中使用的填充模式，必须设置为PKCS7
ICryptoTransform cTransform = rDel.CreateDecryptor(); //用当前的 Key 属性和初始化向量 (IV) 创建对称解密器对象
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
return Encoding.UTF8.GetString(resultArray);
}
catch
{
return null;
}
}

但是如果直接把 transferKey ="qazwsxedcrfv12345" 和 加密结果:BKscOr7eK4jTO5Hcw5oxqS8HWg2SRhtGfMctz8t/45g=

给C#，C#是无法解密的，因为 rDel.Key = keyArray; 会报错。

那么怎么办呢？ 其实我们要把transferKey ="qazwsxedcrfv12345" 处理下，

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龘靐麷鸜郁nm018讟虋纞idnwtyaTN滟厵麷鸜郁骊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));

}

}

运行结果：0UkIZmHsXb0BUql/L3R6Aw== 才是C#需要的key

看看C#调用及结果：



以上只是一个简单的示例。