using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Gs.Toolbox
{
    public class PasswordHelper
    {
        #region  密码加密
        /**/
        /// <summary>  
        /// 转半角的函数(DBC case)   
        /// </summary>   
        /// <param name="input">任意字符串</param>   
        /// <returns>半角字符串</returns>   
        ///<remarks>   
        ///全角空格为12288，半角空格为32   
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248   
        ///</remarks>   
        private static string ToDBC(string input)
        {
            char[] c = input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i] == 12288)
                {
                    c[i] = (char)32;
                    continue;
                }
                if (c[i] > 65280 && c[i] < 65375)
                    c[i] = (char)(c[i] - 65248);
            }
            return new string(c);
        }

        /// <summary>
        /// 转大写
        /// </summary>
        /// <param name="input"></param>
        /// <returns></returns>
        private static string ToUp(string input)
        {
            string s = ToDBC(input);
            System.Text.StringBuilder sb = new StringBuilder();
            char[] c = s.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                sb.Append(c[i].ToString().ToUpper());
            }
            return sb.ToString();
        }

        /// <summary>
        /// MD5加密
        /// </summary>
        /// <param name="strTxt"></param>
        /// <returns></returns>
        public static string ToMd5(string strTxt)
        {
            strTxt = ToUp(strTxt);
            // return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strTxt, "MD5");
            return strTxt;
        }
        #endregion
    }
}