最近一个项目，涉及到java编写的一个集成系统，与几个用C#编写的子系统之间互相传递加密的数据。

以下分别是C#与Java的加密方式：

/// <summary>
/// 加密
/// </summary>
/// <param name="encryptString"></param>
/// <param name="encryptKey">8位的key</param>
/// <returns></returns>
public static string DESEncrypt(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());
}

/// <summary>
/// 解密
/// </summary>
/// <param name="decryptString"></param>
/// <param name="decryptKey">8位的key</param>
/// <returns></returns>
public static string DESDecrypt(string decryptString, string decryptKey)
{
    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
    byte[] inputByteArray = Convert.FromBase64String(decryptString.Replace(' ', '+'));
    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加密解密方法：

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);
}