ASP.NET学习网|ASP.NET教程|ASP.NET MVC|ASP.NET 源码|VS2010教程|ASP.NET视频教程

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

///MD5加密
   public string MD5Encrypt(string   pToEncrypt,   string   sKey)
   {
    DESCryptoServiceProvider   des   =   new   DESCryptoServiceProvider();
    byte[]   inputByteArray   =   Encoding.Default.GetBytes(pToEncrypt);
    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();

   }

   ///MD5解密
   public string MD5Decrypt(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);
    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();
            
    return   System.Text.Encoding.Default.GetString(ms.ToArray());
   }

using System;
using System.Text;
using System.Globalization;
using System.Security.Cryptography;
class DES
{
// 创建Key
public string GenerateKey()
{
DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
}
// 加密字符串
public string EncryptString(string sInputString, string sKey)
{
byte [] data = Encoding.UTF8.GetBytes(sInputString);
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateEncryptor();
byte [] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
return BitConverter.ToString(result);
}
// 解密字符串
public string DecryptString(string sInputString, string sKey)
{
string [] sInput = sInputString.Split("-".ToCharArray());
byte [] data = new byte[sInput.Length];
for(int i = 0; i < sInput.Length; i++)
{
data[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
}
DESCryptoServiceProvider DES = new DESCryptoServiceProvider();
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt = DES.CreateDecryptor();
byte [] result = desencrypt.TransformFinalBlock(data, 0, data.Length);
return Encoding.UTF8.GetString(result);
}
}
class Test
{
static void Main()
{
DES des = new DES();
string key = des.GenerateKey();
string s0 = "中国软件 - csdn.net";
string s1 = des.EncryptString(s0, key);
string s2 = des.DecryptString(s1, key);
Console.WriteLine("原串: [{0}]", s0);
Console.WriteLine("加密: [{0}]", s1);
Console.WriteLine("解密: [{0}]", s2);
}
}
/* 程序输出:
原串: [中国软件 - csdn.net]
加密: [E8-30-D0-F2-2F-66-52-14-45-9A-DC-C5-85-E7-62-9B-AD-B7-82-CF-A8-0A-59-77]
解密: [中国软件 - csdn.net]
*/