using System;
using System.Security;
using System.Security.Cryptography;
using System.Diagnostics;
using System.Web;
using System.Text;
namespace Bigeagle.Util
{
/// <summary>
/// 一个加密类
/// <br>Author: Bigeagle@163.net</br>
/// <br>Date: 2001/09/25</br>
/// <br>History: 2001/10/25 finished</br>
/// </summary>
/// <remarks>
/// 封装常用的加密算法
/// </remarks>
public class Cryptography
{
/// <summary>
/// 生成16位随机密码
/// </summary>
/// <returns></returns>
public static string createpass()
{
int Ran, LengthNum = 16;
string Createpass = "";
for (int i = 1; i < LengthNum; i++)
{
Random ram = new Random();
Ran = Convert.ToInt32(ram.NextDouble() * 2);
if (Ran == 0)
{
Ran = Convert.ToInt32(ram.NextDouble() * 25) + 97;
Createpass = Createpass + Convert.ToString(Convert.ToChar(Ran)).ToUpper();
}
else if (Ran == 1)
{
Ran = Convert.ToInt32(ram.NextDouble() * 9);
Createpass = Createpass + Ran;
}
else if (Ran == 2)
{
Ran = Convert.ToInt32(ram.NextDouble() * 25) + 97;
Createpass = Createpass + Convert.ToString(Convert.ToChar(Ran));
}
}
return Createpass;
}
static void Main(string[] args)
{
string s = Encrypt3DES("Study", "fonny");
Console.WriteLine(s);
Console.WriteLine(Decrypt3DES(s,"fonny"));
Console.WriteLine(CalculateMD5Hash("Study"));
Console.WriteLine(GetMD5("Study","gb2312"));
Console.WriteLine(createpass());
}
/// <summary>
/// md5加密指定字符串
/// </summary>
/// <param name="a_strValue">要加密的字符串</param>
/// <returns>加密后的字符串</returns>
public static string EncryptMD5String(string a_strValue)
{
#if DEBUG
Debug.Assert(a_strValue.Trim() != "", "空字符串", "空字符串不需要加密");
#endif//DEBUG
//转换成bytearray
Byte[] hba = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).
ComputeHash(StringToByteArray(a_strValue));
return ByteArrayToString(hba);
}
/// <summary>
/// md5(1)
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string CalculateMD5Hash(string input)
{
// step 1, calculate MD5 hash from input
MD5 md5 = System.Security.Cryptography.MD5.Create();
byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
byte[] hash = md5.ComputeHash(inputBytes);
// step 2, convert byte array to hex string
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hash.Length; i++)
{
sb.Append(hash[i].ToString("X2"));
}
return sb.ToString();
//这个是C#中的，web中的FormsAuthentication.HashPasswordForStoringInConfigFile(字符串,"MD5")也可以实现
}
/// <summary>
/// md5(2)
/// </summary>
/// <param name="s"></param>
/// <param name="encoding"></param>
/// <returns></returns>
public static string GetMD5(string s, string encoding)
{
System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] t = md5.ComputeHash(System.Text.Encoding.GetEncoding(encoding).GetBytes(s));
System.Text.StringBuilder sb = new System.Text.StringBuilder(32);
for (int i = 0; i < t.Length; i++)
{
sb.Append(t[i].ToString("x").PadLeft(2, '0'));
}
return sb.ToString().ToLower();
}
/// <summary>
/// 判断两个加密字符串是否相同
/// </summary>
/// <param name="a_str1"></param>
/// <param name="a_str2"></param>
/// <returns>如果相同返回真</returns>
public static bool IsSame(string a_str1, string a_str2)
{
Byte[] b1 = StringToByteArray(a_str1);
Byte[] b2 = StringToByteArray(a_str2);
if (b1.Length != b2.Length)
{
return false;
}
for (int i = 0; i < b1.Length; i++)
{
if (b1[i] != b2[i])
{
return false;
}
}
return true;
}
/// <summary>
/// 转换string到Byte树组
/// </summary>
/// <param name="s">要转换的字符串</param>
/// <returns>转换的Byte数组</returns>
public static Byte[] StringToByteArray(String s)
{
/*
Char[] ca = s.ToCharArray();
Byte[] ba = new Byte[ca.Length];
for(int i=0; i<ba.Length; i++) ba[i] = (Byte)ca[i];
return ba;*/
return Encoding.UTF8.GetBytes(s);
}
/// <summary>
/// 转换Byte数组到字符串
/// </summary>
/// <param name="a_arrByte">Byte数组</param>
/// <returns>字符串</returns>
public static string ByteArrayToString(Byte[] a_arrByte)
{
/*
//char[] ca = new char[a_arrByte.Length] ;
for(int i = 0 ; i < a_arrByte.Length ; i ++)
{
result += (char)a_arrByte[i] ;
}*/
return Encoding.UTF8.GetString(a_arrByte);
}
/// <summary>
/// 3des加密字符串
/// </summary>
/// <param name="a_strString">要加密的字符串</param>
/// <param name="a_strKey">密钥</param>
/// <returns>加密后并经base64编码的字符串</returns>
/// <remarks>静态方法，采用默认ascii编码</remarks>
public static string Encrypt3DES(string a_strString, string a_strKey)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));
DES.Mode = CipherMode.ECB;
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(a_strString);
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}//end method
/// <summary>
/// 3des加密字符串
/// </summary>
/// <param name="a_strString">要加密的字符串</param>
/// <param name="a_strKey">密钥</param>
/// <param name="encoding">编码方式</param>
/// <returns>加密后并经base63编码的字符串</returns>
/// <remarks>重载，指定编码方式</remarks>
public static string Encrypt3DES(string a_strString, string a_strKey, Encoding encoding)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));
DES.Mode = CipherMode.ECB;
ICryptoTransform DESEncrypt = DES.CreateEncryptor();
byte[] Buffer = encoding.GetBytes(a_strString);
return Convert.ToBase64String(DESEncrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}
/// <summary>
/// 3des解密字符串
/// </summary>
/// <param name="a_strString">要解密的字符串</param>
/// <param name="a_strKey">密钥</param>
/// <returns>解密后的字符串</returns>
/// <exception cref="">密钥错误</exception>
/// <remarks>静态方法，采用默认ascii编码</remarks>
public static string Decrypt3DES(string a_strString, string a_strKey)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
DES.Key = hashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(a_strKey));
DES.Mode = CipherMode.ECB;
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
string result = "";
try
{
byte[] Buffer = Convert.FromBase64String(a_strString);
result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}
catch (Exception e)
{
#if DEBUG
Console.WriteLine("错误：{0}", e);
#endif//DEBUG
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));
}
return result;
}//end method
/// <summary>
/// 3des解密字符串
/// </summary>
/// <param name="a_strString">要解密的字符串</param>
/// <param name="a_strKey">密钥</param>
/// <param name="encoding">编码方式</param>
/// <returns>解密后的字符串</returns>
/// <exception cref="">密钥错误</exception>
/// <remarks>静态方法，指定编码方式</remarks>
public static string Decrypt3DES(string a_strString, string a_strKey, Encoding encoding)
{
TripleDESCryptoServiceProvider DES = new
TripleDESCryptoServiceProvider();
MD5CryptoServiceProvider hashMD5 = new MD5CryptoServiceProvider();
DES.Key = hashMD5.ComputeHash(encoding.GetBytes(a_strKey));
DES.Mode = CipherMode.ECB;
ICryptoTransform DESDecrypt = DES.CreateDecryptor();
string result = "";
try
{
byte[] Buffer = Convert.FromBase64String(a_strString);
result = encoding.GetString(DESDecrypt.TransformFinalBlock
(Buffer, 0, Buffer.Length));
}
catch (Exception e)
{
#if DEBUG
Console.WriteLine("错误：{0}", e);
#endif//DEBUG
throw (new Exception("Invalid Key or input string is not a valid base64 string", e));
}
return result;
}//end method
}
}