網上很多人在問怎么實現Web系統URL傳輸(表單提交)參數加密。例如:要進行一個用戶帳號編輯，要傳遞用戶的ID，URL如下:http://localhost/mysystem/editAccounts.aspx?ID=2?
但又不想讓別人知道這個用戶的ID為2，惡意的使用者可能還會將2修改，改為別的用戶ID。??

View Code using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;

namespace EIP.Framework
...{
public class Security
...{
string _QueryStringKey = "abcdefgh"; //URL傳輸參數加密Key
string _PassWordKey = "hgfedcba"; //PassWord加密Key

public Security()
...{
}

public string EncryptQueryString(string QueryString)
...{
return Encrypt(QueryString,_QueryStringKey);
}


public string DecryptQueryString(string QueryString)
...{
return Decrypt(QueryString,_QueryStringKey);
}


public string EncryptPassWord(string PassWord)
...{
return Encrypt(PassWord,_PassWordKey);
}


public string DecryptPassWord(string PassWord)
...{
return Decrypt(PassWord,_PassWordKey);
}

/**////
/// DEC 加密過程
///
///
///
///
public string Encrypt(string pToEncrypt,string sKey)
...{
DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte數組中

byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);

des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密對象的密鑰和偏移量
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
MemoryStream ms = new MemoryStream(); //使得輸入密碼必須輸入英文文本
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();
}

/**////
/// DEC 解密過程
///
///
///
///
public string Decrypt(string pToDecrypt, string sKey)
...{
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); //建立加密對象的密鑰和偏移量，此值重要，不能修改
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();

StringBuilder ret = new StringBuilder(); //建立StringBuild對象，CreateDecrypt使用的是流對象，必須把解密后的文本變成流對象

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

/**////
/// 檢查己加密的字符串是否與原文相同
///
///
///
///
///
public bool ValidateString(string EnString, string FoString, int Mode)
...{
switch (Mode)
...{
default:
case 1:
if (Decrypt(EnString,_QueryStringKey) == FoString.ToString())
...{
return true;
}
else
...{
return false;
}
case 2:
if (Decrypt(EnString,_PassWordKey) == FoString.ToString())
...{
return true;
}
else
...{
return false;
}
}
}
}
}

轉載于:https://www.cnblogs.com/KohnKong/articles/2216655.html

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