using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace CommonUtil.DMEncrypt
{
    /// <summary>
    /// 多卖加密
    /// </summary>
  public static  class Encrypt
    {
        private static byte[] Keys = new byte[]
        {
            18,
            52,
            86,
            120,
            144,
            171,
            205,
            239
        };
        private static readonly string keyData = "appdm&2s";

        /// <summary>
        /// 加密Secret
        /// </summary>
        public static readonly string keySecret = "secdm*41";

        /// <summary>
        /// 备份订单数据加密
        /// </summary>
        public readonly static string keyBdUser = "sebddm*1";

        /// <summary>
        /// 加密sql
        /// </summary>
        public static readonly string keySql = "dmrebuqi";

        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="decryptString"></param>
        /// <returns></returns>
        public static string DecryptDES(string decryptString)
        {
            string result;
            try
            {
                byte[] bytes = Encoding.UTF8.GetBytes(Encrypt.keyData);
                byte[] keys = Encrypt.Keys;
                byte[] array = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
                MemoryStream memoryStream = new MemoryStream();
                CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateDecryptor(bytes, keys), CryptoStreamMode.Write);
                cryptoStream.Write(array, 0, array.Length);
                cryptoStream.FlushFinalBlock();
                result = Encoding.UTF8.GetString(memoryStream.ToArray());
            }
            catch
            {
                result = decryptString;
            }
            return result;
        }

        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="encryptString"></param>
        /// <returns></returns>
        public static string EncryptDES(string encryptString)
        {
            string result;
            try
            {
                byte[] bytes = Encoding.UTF8.GetBytes(Encrypt.keyData.Substring(0, 8));
                byte[] keys = Encrypt.Keys;
                byte[] bytes2 = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
                MemoryStream memoryStream = new MemoryStream();
                CryptoStream cryptoStream = new CryptoStream(memoryStream, dESCryptoServiceProvider.CreateEncryptor(bytes, keys), CryptoStreamMode.Write);
                cryptoStream.Write(bytes2, 0, bytes2.Length);
                cryptoStream.FlushFinalBlock();
                result = Convert.ToBase64String(memoryStream.ToArray());
            }
            catch
            {
                result = encryptString;
            }
            return result;
        }

        #region 必达账号加密
        /// <summary>
        /// 必达账号加密
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串 </returns>
        public static string EncryptDES_BD(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(keyBdUser.Substring(0, 8));//转换为字节
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();//实例化数据加密标准
                MemoryStream mStream = new MemoryStream();//实例化内存流
                //将数据流链接到加密转换的流
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }
        #endregion

        #region 必达账号解密
        /// <summary>
        /// 必达账号解密
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES_BD(string decryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(keyBdUser);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }
        #endregion

        #region 数据库链接字符串 加密解密

        /// <summary>
        /// 数据库链接加密
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <returns>加密成功返回加密后的字符串，失败返回源串 </returns>
        public static string EncryptDES_DB(string encryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(keySql.Substring(0, 8));//转换为字节
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();//实例化数据加密标准
                MemoryStream mStream = new MemoryStream();//实例化内存流
                //将数据流链接到加密转换的流
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }

        /// <summary>
        /// 数据库链接解密
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
        public static string DecryptDES_DB(string decryptString)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(keySql);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }

        #endregion
    }
}