C#加密解密
2009-07-06 18:23 lome 阅读(1626) 评论(4) 编辑 收藏 举报//-------------------------------------------------
//
// DataBase.Recordset类 server-me 04/08/10
//
//--------------------------------------------------
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace DataLayer.Com
{
/// <summary>
/// Encrypt_D 的摘要说明。
/// </summary>
public class Encrypt_D
{
/// <summary>
/// 构造函数
/// </summary>
public Encrypt_D()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
#region 使用MD5进行数据加密。
/// <summary>
/// 使用MD5进行数据加密。
/// </summary>
/// <param name="str">需要加密的数据。</param>
/// <param name="kind">加密类型：1-普通加密；2-密码加密</param>
/// <returns>返回加密的数据</returns>
public string GetMD5(string str,int kind)
{
string reStr = "";
//获取要加密的字段，并转化为Byte[]数组
byte[] data=System.Text.Encoding.Unicode.GetBytes(str.ToCharArray());
//建立加密服务
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
//1代表加密Byte[]数组
if(kind == 1)
{
//加密Byte[]数组
byte[] result= md5.ComputeHash(data);
//将加密后的数组转化为字段
string sResult=System.Text.Encoding.Unicode.GetString(result);
//MD5普通加密
reStr = sResult.ToString();
}
//2代表作为密码方式加密
else if(kind == 2)
{
//作为密码方式加密
string EnPswdStr=System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str,"MD5");
//MD5密码加密
reStr = EnPswdStr;
}
return reStr.ToString();
}
#endregion
/// <summary>
/// 对数据进行加密。
/// </summary>
/// <param name="strText">传入加密的数据</param>
/// <returns>返回加密后的字字符串</returns>
public string EncryptText(String strText)
{
return Encrypt(strText, "&%#@?,:*_");
}
/// <summary>
/// 对数据进行解密。
/// </summary>
/// <param name="strText">传入解密的数据</param>
/// <returns>返回解密后的字字符串</returns>
public String DecryptText(String strText)
{
return Decrypt(strText, "&%#@?,:*_");
}
#region 加密解密函数
/// <summary>
/// 加密函数
/// </summary>
/// <param name="strText"></param>
/// <param name="strEncrKey"></param>
/// <returns></returns>
private String Encrypt(String strText, String strEncrKey)
{
Byte[] byKey = {};
Byte[] IV = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
Byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch(Exception ex)
{
return ex.Message;
}
}
/// <summary>
/// 解密函数
/// </summary>
/// <param name="strText"></param>
/// <param name="sDecrKey"></param>
/// <returns></returns>
private String Decrypt(String strText, String sDecrKey)
{
Byte[] byKey = {};
Byte[] IV = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
Byte[] inputByteArray = new byte[strText.Length];
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(strText);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
System.Text.Encoding encoding = System.Text.Encoding.UTF8;
return encoding.GetString(ms.ToArray());
}
catch(Exception ex)
{
return ex.Message;
}
}
#endregion
}
}
