? public static class MD5Common
? {
????? /// <summary>
????? /// 返回指定字符串的Md5
????? /// </summary>
????? /// <param name="strInput">指定字符串</param>
????? /// <returns>返回字符串的Md5</returns>
????? public static string GetMd5Hash(string strInput)
????? {
????????? // Create a new instance of the MD5CryptoServiceProvider object.
????????? MD5 md5Hasher = MD5.Create();

????????? // Convert the input string to a byte array and compute the hash.
????????? byte[] btData = md5Hasher.ComputeHash(Encoding.Default.GetBytes(strInput));

????????? // Create a new Stringbuilder to collect the bytes
????????? // and create a string.
????????? StringBuilder sBuilder = new StringBuilder();

????????? // Loop through each byte of the hashed data
????????? // and format each one as a hexadecimal string.
????????? for (int i = 0; i < btData.Length; i++)
????????? {
????????????? sBuilder.Append(btData[i].ToString("x2"));
????????? }

????????? // Return the hexadecimal string.
????????? return sBuilder.ToString();
????? }

????? /// <summary>
????? /// 检查一个普通字符串的Md5，与传递的Md5字符串是否相同
????? /// </summary>
????? /// <param name="strInput">普通字符串</param>
????? /// <param name="strHash">Md5字符串</param>
????? /// <returns>返回是否相同</returns>
????? public static bool VerifyMd5Hash(string strInput, string strHash)
????? {
????????? // Hash the input.
????????? string strhashOfInput = GetMd5Hash(strInput);

????????? // Create a StringComparer an comare the hashes.
????????? StringComparer comparer = StringComparer.OrdinalIgnoreCase;

????????? if (0 == comparer.Compare(strhashOfInput, strHash))
????????? {
????????????? return true;
????????? }
????????? else
????????? {
????????????? return false;
????????? }
????? }

? }