高分求助

Question

小弟我要用DES算法解密配置文件,然后把解密后的内容写入内存中,请问怎么做,最好给出代码

Answer 1

你是要写内存的代码还是DES算法的代码？
DES算法就是调用方法返回值就行了c#是一般不能直接操作内存的

Answer 2

private static readonly string DESKey = "ABCDEFGH";//这是加密算法的密钥,对于Key的要求是:长度只能是八个字节.
        private static readonly string DESIV = "HGFEDCBA";//这是初始化向量,对于IV的要求是:长度也只能是八个字节.        /// <summary>
        /// 传递要加密的文本，返回加密之后的文本，即密文
        /// </summary>
        /// <param name="aBeforeString"></param>
        /// <returns></returns>
        public static string Encrypt(string aBeforeString)
        {
            byte[] arrDESKey;
            byte[] arrDESIV;
            MemoryStream ms = new MemoryStream();//这是采用内存流的方式加密文本,加密后直接以字节流的方式返回密文.
            DESCryptoServiceProvider objDES;
            ICryptoTransform objEncryptor;
            CryptoStream objCryptoStream;
            arrDESKey = Convert2ByteArray(DESKey);
            arrDESIV = Convert2ByteArray(DESIV);
            objDES = new DESCryptoServiceProvider();
            objEncryptor = objDES.CreateEncryptor(arrDESKey, arrDESIV);
            objCryptoStream = new CryptoStream(ms, objEncryptor, CryptoStreamMode.Write);
            StreamWriter sw = new StreamWriter(objCryptoStream);
            sw.Write(aBeforeString);
            // Close the StreamWriter and CryptoStream.
            sw.Close();
            objCryptoStream.Close();
            // Get an array of bytes that represents
            // the memory stream.
            byte[] buffer = ms.ToArray();
            // Close the memory stream.
            ms.Close();
            string aString = "";
            for (int i = 0; i < buffer.Length; i++)
            {
                aString = aString + BitConverter.ToChar(buffer, i).ToString();//在这里对于密文//做了进一步的处理,将相临的两个字节组合成一个16位的Unicode字符
                i = i + 1;
            }
            return aString;
        }        public static string Decrypt(string aAferterString)//解密密文,返回原文本.
        {
            byte[] arrDESKey;
            byte[] arrDESIV;
            DESCryptoServiceProvider objDES;
            ICryptoTransform objDecryptor;
            CryptoStream objCryptoStream;
            MemoryStream ms = new MemoryStream(ConvertStringTOByte(aAferterString));
            arrDESKey = Convert2ByteArray(DESKey);
            arrDESIV = Convert2ByteArray(DESIV);
            objDES = new DESCryptoServiceProvider();
            objDecryptor = objDES.CreateDecryptor(arrDESKey, arrDESIV);
            objCryptoStream = new CryptoStream(ms, objDecryptor, CryptoStreamMode.Read);//解密是采取和加密相反的方式进行解密.
            StreamReader sr = new StreamReader(objCryptoStream);
            // Read the stream as a string.
            string val = sr.ReadToEnd();
            // Close the streams.
            sr.Close();
            objCryptoStream.Close();
            ms.Close();
            //objFileStream.Close();
            return val;
        }

Answer 3

估计要调用windows API 中 WriteProcessMemory来处理了。