关于DES加密算法

Question

本帖最后由 anan221 于 2009-08-20 15:17:12 编辑

Answer 1

 /// </summary>
    public static readonly string encryptKey = "q0m3sd8l";    #region 加密方法,DES加密算法
    /// <summary>
    /// 加密方法
    /// </summary>
    /// <param name="pToEncrypt">需要加密字符串</param>
    /// <param name="sKey">密钥</param>
    /// <returns>加密后的字符串</returns>
    public static string Encrypt(string pToEncrypt, string sKey)
    {
        try
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            //把字符串放到byte数组中            
            byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
            //建立加密对象的密钥和偏移量            
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }
        catch
        {
           
        }        return "";
    }
    #endregion    #region 解密方法
    /// <summary>
    /// 解密方法
    /// </summary>
    /// <param name="pToDecrypt">需要解密的字符串</param>
    /// <param name="sKey">密匙</param>
    /// <returns>解密后的字符串</returns>
    public static string Decrypt(string pToDecrypt, string sKey)
    {
        try
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
            for (int x = 0; x < pToDecrypt.Length / 2; x++)
            {
                int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }            //建立加密对象的密钥和偏移量，此值重要，不能修改
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            //建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象
            StringBuilder ret = new StringBuilder();
            return System.Text.Encoding.Default.GetString(ms.ToArray());
        }
        catch
        {
           
        }
        return "";
    }
    #endregion试试上面的加密解密算法吧

Answer 2

KEY，IV要怎样转化成字节数组