加密MD5加密与解密

MD5加密与解密算法代码

一字符串加密public static String GetMD5(string input)

{

System.Security.Cryptography.MD5CryptoServiceProvider x=newSystem.Security.Cryptography.MD5CryptoServiceProvider();byte[ ]bs =System.Text.Encoding.UTF8.GetBytes(input) ;bs =x.ComputeHash(bs) ;

System.Text.StringBuilder s =newSystem.Text.StringBuilder() ;foreach(byte b inbs)

{s.Append(b.ToString("x2") .ToLower()) ;

}returns.ToString() ;

}public static string GetMD5(string sDataIn)

{

MD5CryptoServiceProvider md5 = new

MD5CryptoServiceProvider() ;byte[ ] bytValue, bytHash;bytValue = System.Text.Encoding.UTF8.GetBytes(sDataIn) ;bytHash = md5.ComputeHash(bytValue) ;md5.Clear( ) ;string sTemp = "";for (int i = 0; i < bytHash.Length; i++)

{sTemp += bytHash[i] .ToString("X") .PadLeft(2, '0' );}return sTemp.ToLower() ;

}

二文件加密

/// <summary>

///计算文件MD5值

/// </summary>

/// <param name="str">需要计算的文件路径</param>

/// <returns>MD5值</returns>public static string MD5Value(String filepath)

{

MD5 md5 = new MD5CryptoServiceProvider();byte[ ] md5ch;using (FileStream fs = File.OpenRead(filepath) ){md5ch = md5.ComputeHash(fs) ;

}md5.Clear( ) ;string strMd5 = "";for (int i = 0; i < md5ch.Length - 1; i++)

{strMd5 += md5ch[i] .ToString("x") .PadLeft(2, '0' ) ;}return strMd5;

}