DES加密/解密字符串

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//默认密钥向量    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };    /// <summary>    /// DES加密字符串    /// </summary>    /// <param name="encryptString">待加密的字符串</param>    /// <param name="encryptKey">加密密钥,要求为8位</param>    /// <returns>加密成功返回加密后的字符串，失败返回源字符串</returns>    public static string EncryptDES(string encryptString, string encryptKey)    {        try        {            byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));            byte[] rgbIV = Keys;            byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);            DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();            MemoryStream mStream = new MemoryStream();            CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);            cStream.Write(inputByteArray, 0, inputByteArray.Length);            cStream.FlushFinalBlock();            return Convert.ToBase64String(mStream.ToArray());        }        catch        {            return encryptString;        }    }    /// <summary>    /// DES解密字符串    /// </summary>    /// <param name="decryptString">待解密的字符串</param>    /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>    /// <returns>解密成功返回解密后的字符串，失败返源串</returns>    public static string DecryptDES(string decryptString, string decryptKey)    {        try        {            byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);            byte[] rgbIV = Keys;            byte[] inputByteArray = Convert.FromBase64String(decryptString);            DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();            MemoryStream mStream = new MemoryStream();            CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);            cStream.Write(inputByteArray, 0, inputByteArray.Length);            cStream.FlushFinalBlock();            return Encoding.UTF8.GetString(mStream.ToArray());        }        catch        {            return decryptString;        }    }
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