C# DES加密后存储，解密后显示问题。

usingSystem;usingSystem.Collections.Generic;usingSystem.Text;usingDIS_IDAL;usingSyste... using System;
using System.Collections.Generic;
using System.Text;
using DIS_IDAL;
using System.Security.Cryptography;
using System.IO;
using DIS_Models;

namespace DIS_DAL
{
public class DESCryptograhy : ISymmetricAlgorithm
{
DESCryptoServiceProvider key = new DESCryptoServiceProvider();
CryptoStream encStream;

public object Read()
{
//根据密钥来对对象进行解密则返回
try
{
FileStream fs = new FileStream("d:\\1.txt", FileMode.Open, FileAccess.Read);
encStream = new CryptoStream(fs, key.CreateDecryptor(), CryptoStreamMode.Read);
StreamReader sr = new StreamReader(encStream);
object o = sr.ReadLine();
key.Clear();
sr.Close();
return o;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return "error";
}
}

public void Write(string obj)
{
//加密后写入到存储介质上
CryptograhyInfo cInfo = new CryptograhyInfo();
FileStream fs = new FileStream("d:\\1.txt", FileMode.OpenOrCreate, FileAccess.Write);
encStream = new CryptoStream(fs, key.CreateEncryptor(), CryptoStreamMode.Write);
StreamWriter sw = new StreamWriter(encStream);
sw.WriteLine(obj);
sw.Close();
}
}
}
在Read方法里的object o = sr.ReadLine();为什么老是出错，变量obj总取不到值。
谢谢下面的朋友的建议，但提到用ReadToEnd还是出错的，之前也我在ConsoleApplication下用Console.WriteLine(sr.ReadLine())是可以的。。我就是想做加密类把分别做写和读，但是总是不能把读的结果解密后返回来。头疼……希望有心朋友帮帮忙展开

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Raiuy
2010-12-06 · TA获得超过2916个赞

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在我这里测试你的代码是可以的，不过我把object o = sr.ReadLine();改成了object o = sr.ReadToEnd();

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2010-12-07

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刚刚看了下，好像是乱码。我这里改为ReadToEnd() 也会报错。 

会报这个错误：Length of the data to decrypt is invalid     
我现在一时解决不了... 

您好，我现在解决了，但是你的那种读取方式，我还是修改不了，这个是我的修改方案，我把aspx页面 和 aspx.cs页面完整贴出来，你可以试下：
aspx页面：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>DES加密</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtWrite" runat="server" TextMode="MultiLine"></asp:TextBox>
    <br />
        <asp:Button ID="btnWrite" runat="server" Text="写入txt并用DES加密" 
            onclick="btnWrite_Click" />
        <br />
        <br />
        <asp:Button ID="btnRead" runat="server" Text="读取Des加密的txt内容:" 
            onclick="btnRead_Click" />
        <asp:Label ID="lblReadContent" runat="server" Text=""></asp:Label>
    </div>
    </form>
</body>
</html>
*****************************************************
aspx.cs页面
/// <summary>
    /// 读取文件并解密
    /// </summary>
    /// <returns></returns>
    public object Read()
    {
        //根据密钥来对对象进行解密则返回
        try
        {
            using (FileStream fs = new FileStream("d:\\1.txt", FileMode.Open, FileAccess.Read))
            {
                using (StreamReader reader = new StreamReader(fs,System.Text.Encoding.UTF8))
                {
                    string obj = reader.ReadToEnd();
                    return Decrypt(obj, "12345678");
                }
            }
            
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
            return "error";
        }
    }

    /// <summary>
    /// 写入文件（加密）
    /// </summary>
    /// <param name="obj">要加密的字符串</param>
    public void Write(string obj)
    {
        string txtValue = Encrypt(obj, "12345678");

        using (FileStream fs = new FileStream("d:\\1.txt", FileMode.OpenOrCreate, FileAccess.Write))
        {
            using (StreamWriter sw = new StreamWriter(fs,Encoding.UTF8))
            {
                sw.Write(txtValue);
            }
        }

    }

    protected void btnWrite_Click(object sender, EventArgs e)
    {
        Write(txtWrite.Text);
    }
    protected void btnRead_Click(object sender, EventArgs e)
    {
        object objRead = Read();
        this.lblReadContent.Text = objRead.ToString();
    }

/// <summary>
    /// 加密
    /// </summary>
    /// <param name="pToEncrypt"></param>
    /// <param name="sKey">注意，这个sKey长度必须为8，可以为任意字母或数字，但是解密和加密时sKey必须一致</param>
    /// <returns></returns>
    public string Encrypt(string pToEncrypt, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);

        //建立加密对象的密钥和偏移量 
        //原文使用ASCIIEncoding.ASCII方法的GetBytes方法 
        //使得输入密码必须输入英文文本 
        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
        using (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();
        }
    }

/// <summary>
    /// 解密
    /// </summary>
    /// <param name="pToDecrypt"></param>
    /// <param name="sKey"></param>
    /// <returns></returns>
    public string Decrypt(string pToDecrypt, string sKey)
    {
        using (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;
            }

            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
            using (MemoryStream ms = new MemoryStream())
            {
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
                cs.Write(inputByteArray, 0, inputByteArray.Length);
                cs.FlushFinalBlock();

                StringBuilder ret = new StringBuilder();

                return System.Text.Encoding.UTF8.GetString(ms.ToArray());
            }
        }
    }


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