using System.Security.Cryptography;
using System.Text;

namespace learun.util
{
	/// <summary>
	/// 版 本 EasyCode EC管理后台
	/// Copyright (c) 2019-present EC管理有限公司
	/// 创建人：tobin
	/// 日 期：2019.09.13
	/// 描 述：md5加密
	/// </summary>
	public class Md5Helper
	{
		#region "MD5加密"

		/// <summary>
		/// MD5加密
		/// </summary>
		/// <param name="str">加密字符</param>
		/// <param name="code">加密位数16/32</param>
		/// <returns></returns>
		public static string Encrypt(string str, int code)
		{
			string strEncrypt = string.Empty;
			if (code == 16)
			{
				strEncrypt = Hash(str).Substring(8, 16);
			}

			if (code == 32)
			{
				strEncrypt = Hash(str);
			}
			return strEncrypt;
		}

		/// <summary>
		/// 32位MD5加密（小写）
		/// </summary>
		/// <param name="input">输入字段</param>
		/// <returns></returns>
		public static string Hash(string input)
		{
			MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
			byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
			StringBuilder sBuilder = new StringBuilder();
			for (int i = 0; i < data.Length; i++)
			{
				sBuilder.Append(data[i].ToString("x2"));
			}
			return sBuilder.ToString();
		}

		#endregion "MD5加密"
	}
}