using Infrastructure.Helpers;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Infrastructure.Utilities
{
    public static class DESEncrypt
    {
        private static readonly string key = "hopetry###***";

        //
        // 摘要:
        //     加密
        //
        // 参数:
        //   Text:
        //     需要加密的内容
        public static string Encrypt(string Text)
        {
            return Encrypt(Text, key);
        }

        //
        // 摘要:
        //     加密数据
        //
        // 参数:
        //   Text:
        //     需要加密的内容
        //
        //   sKey:
        //     秘钥
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
            byte[] bytes = Encoding.Default.GetBytes(Text);
            dESCryptoServiceProvider.Key = Encoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
            dESCryptoServiceProvider.IV = Encoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateEncryptor(), CryptoStreamMode.Write);
            cryptoStream.Write(bytes, 0, bytes.Length);
            cryptoStream.FlushFinalBlock();
            StringBuilder stringBuilder = new StringBuilder();
            byte[] array = memoryStream.ToArray();
            foreach (byte b in array)
            {
                stringBuilder.AppendFormat("{0:X2}", b);
            }

            return stringBuilder.ToString();
        }

        //
        // 摘要:
        //     解密
        //
        // 参数:
        //   Text:
        //     需要解密的内容
        public static string Decrypt(string Text)
        {
            if (!string.IsNullOrEmpty(Text))
            {
                return Decrypt(Text, key);
            }

            return "";
        }

        //
        // 摘要:
        //     解密数据
        //
        // 参数:
        //   Text:
        //     需要解密的内容
        //
        //   sKey:
        //     秘钥
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
            int num = Text.Length / 2;
            byte[] array = new byte[num];
            for (int i = 0; i < num; i++)
            {
                int num2 = Convert.ToInt32(Text.Substring(i * 2, 2), 16);
                array[i] = (byte)num2;
            }

            dESCryptoServiceProvider.Key = Encoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
            dESCryptoServiceProvider.IV = Encoding.ASCII.GetBytes(Md5Helper.Hash(sKey).ToUpper().Substring(0, 8));
            MemoryStream memoryStream = new MemoryStream();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateDecryptor(), CryptoStreamMode.Write);
            cryptoStream.Write(array, 0, array.Length);
            cryptoStream.FlushFinalBlock();
            return Encoding.Default.GetString(memoryStream.ToArray());
        }
    }
}