/// <summary>
/// 获得32位的MD5加密
/// </summary>
/// <param name="str">加密字符串</param>
/// <returns>返回值</returns>
public static string GetMD532(string str)
{
MD5 md5 = MD5.Create();
byte[] d = md5.ComputeHash(Encoding.Default.GetBytes(str));
return BitConverter.ToString(d).Replace("-", "").ToLower();
}