DES 암호화 해독 함수

//      

private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

/// <summary>

/// DES     

/// </summary>

/// <param name="encryptString">       </param>

/// <param name="encryptKey">    ,   8 </param>

/// <returns>             ，      </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     

/// </summary>

/// <param name="decryptString">       </param>

/// <param name="decryptKey">    ,   8 ,       </param>

/// <returns>             ，     </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;

    }

}