Java与C#交互DES算法加密解密数据

    要加密结果一样，其实很简单，只要IV值和密钥一样，出来的结果应该都是一样的。

    C#的DES加密解密算法：密钥长度为8

   

public static string Encode(string encryptString, string encryptKey)
{
    DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
    byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey);
    byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
    MemoryStream mStream = new MemoryStream();
    CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, new byte[8]), CryptoStreamMode.Write);
    cStream.Write(inputByteArray, 0, inputByteArray.Length);
    cStream.FlushFinalBlock();
    return Convert.ToBase64String(mStream.ToArray());
}

public static string Decode(string decryptString, string decryptKey)
{
    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
    byte[] inputByteArray = Convert.FromBase64String(decryptString);
    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
    MemoryStream mStream = new MemoryStream();
    CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, new byte[8]), CryptoStreamMode.Write);
    cStream.Write(inputByteArray, 0, inputByteArray.Length);
    cStream.FlushFinalBlock();
    return Encoding.UTF8.GetString(mStream.ToArray());
}

    Java的DES算法，密钥长度为8

public static String encryptDES(String encryptString, String encryptKey) throws Exception {
IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
SecretKeySpec key = new SecretKeySpec(encryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, zeroIv);
byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
return new BASE64Encoder().encode(encryptedData);
}

public static String decryptDES(String decryptString, String decryptKey) throws Exception {
byte[] byteMi = new BASE64Decoder().decodeBuffer(decryptString);
IvParameterSpec zeroIv = new IvParameterSpec(new byte[8]);
SecretKeySpec key = new SecretKeySpec(decryptKey.getBytes(), "DES");
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key, zeroIv);
byte decryptedData[] = cipher.doFinal(byteMi);
return new String(decryptedData);
}

其实这个问题并不难解决，只是网上一些DES的算法的例子代码并没有用到IV，容易让人产生误解。