【asp】asp.net EncryptHelper 加密帮助类-net-EncryptHelper

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asp.net EncryptHelper 加密帮助类

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;

namespace Sheng.Common
{
/// <summary>
/// 加密帮助类
/// </summary>
public class EncryptHelper
{
/// <summary>
/// MD5加密
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string MD5DecryptString(string str)
{
MD5CryptoServiceProvider md5=new MD5CryptoServiceProvider();
byte[] md5Source=System.Text.Encoding.UTF8.GetBytes(str);
byte[] md5Out=md5.ComputeHash(md5Source);
return Convert.ToBase64String(md5Out);
}

/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="sInputString">输入字符</param>
/// <param name="sKey">Key</param>
/// <returns>加密结果</returns>
public string DESEncryptString(string sInputString, string sKey)
{
try
{
byte[] data=Encoding.Default.GetBytes(sInputString);
byte[] result;
DESCryptoServiceProvider DES=new DESCryptoServiceProvider();
DES.Key=ASCIIEncoding.ASCII.GetBytes(sKey); //密钥
DES.IV=ASCIIEncoding.ASCII.GetBytes(sKey); //初始化向量
ICryptoTransform desencrypt=DES.CreateEncryptor(); //加密器对象
result=desencrypt.TransformFinalBlock(data, 0, data.Length); //转换指定字节数组的指定区域
return BitConverter.ToString(result);
}
catch (Exception ex)
{
//ex.Message="DES加密异常";
throw ex;
}
}

/// <summary>
/// DES解密字符串
/// </summary>
/// <param name="sInputString">输入字符</param>
/// <param name="sKey">Key</param>
/// <returns>解密结果</returns>
public string DESDecryptString(string sInputString, string sKey)
{
try
{
//将字符串转换为字节数组
string[] sInput=sInputString.Split("-".ToCharArray());
byte[] data=new byte[sInput.Length];
byte[] result;
for (int i=0; i < sInput.Length; i++)
{
data[i]=byte.Parse(sInput[i], System.Globalization.NumberStyles.HexNumber);
}

DESCryptoServiceProvider DES=new DESCryptoServiceProvider();
DES.Key=ASCIIEncoding.ASCII.GetBytes(sKey);
DES.IV=ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform desencrypt=DES.CreateDecryptor();
result=desencrypt.TransformFinalBlock(data, 0, data.Length);
return Encoding.Default.GetString(result);
}
catch (Exception ex)
{
//ex.Message="DES解密异常";
throw ex;
}
}
}
}

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