문자열과 파일 MD5 값을 계산하는 작은 예

 
  
//      MD5  
  
        public 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(); 
  
        } 
  
        
   
  
        //     MD5 
        public 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;
        }