///-----------------------------------------------------------------------
/// <copyright file="EncryptMgr.cs" company="Origtek">
/// 程式代號: EncryptMgr
/// 程式名稱: 加解密總管
///	程式說明: 提供加密解密
///	起始作者: Hercules
///	起始日期: 2016/06/17
///	最新修改人: Hercules
///	最新修日期: 2016/06/17
/// </copyright>
///-----------------------------------------------------------------------
#region 程式異動記錄
/// xx.YYYY/MM/DD    VER     AUTHOR       COMMENTS(說明修改的內容)  
/// 01.2016/06/17    1.0     Hercules     CREATE
///	最新修改人: Hercules
///	最新修日期: 2016/06/17
#endregion

using OT.COM.Encryption;
using OT.COM.LogisticsUtil;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace SoldierData
{
    /// <summary>   
    /// 類別名稱:EncryptMgr
    /// 類別說明:加解密總管
    /// 起始作者:Hercules
    /// 起始日期:2016/06/17
    ///	最新修改人: Hercules
    ///	最新修日期: 2016/06/17
    /// </summary>
    public class SecurityUtil
    {
        private static Util _ut = new Util();
        private static byte[] _Key = System.Text.Encoding.Unicode.GetBytes(_ut.GetSettingString("KEY"));
        private static byte[] _IV = System.Text.Encoding.Unicode.GetBytes(_ut.GetSettingString("IV"));
        private static AES _aes = new AES();
        /// <summary>
        /// 函式名稱:Encrypt
        /// 函式說明:加密API
        /// 起始作者:Hercules
        /// 起始日期:2016/06/17
        ///	最新修改人: Hercules
        ///	最新修日期: 2016/06/17
        /// </summary>
        /// <param name="i_sPlaintext">明碼</param>
        /// <param name="o_sCiphertext">暗碼</param>
        /// <returns>錯誤訊息，若成功則為Null</returns>
        public static string Encrypt(string i_sPlaintext, out string o_sCiphertext)
        {
            string sMsg = null;
            string sRes = null;


            try
            {
                do
                {
                    byte[] baRes = _aes.EncryptStringToByte(
                       i_sPlaintext,
                       _Key,
                       _IV);
                    sRes = Convert.ToBase64String(baRes);
                }
                while (false);

            }
            catch (Exception ex)
            {
                sMsg = _ut.GetLastExceptionMsg(ex);
            }
            finally
            {
                o_sCiphertext = sRes;
            }

            return sMsg;
        }

        /// <summary>
        /// 函式名稱:Decrypt
        /// 函式說明:解密API
        /// 起始作者:Hercules
        /// 起始日期:2016/06/17
        ///	最新修改人: Hercules
        ///	最新修日期: 2016/06/17
        /// </summary>
        /// <param name="i_sCiphertext">暗碼</param>
        /// <param name="o_sPlaintext">明碼</param>
        /// <returns>錯誤訊息，若成功則為Null</returns>
        public static string Decrypt(string i_sCiphertext, out string o_sPlaintext)
        {
            string sMsg = null;
            string sRes = null;

            try
            {
                do
                {
                    byte[] baCiphertext = Convert.FromBase64String(i_sCiphertext);
                    sRes = _aes.DecryptByteToString(
                       baCiphertext,
                       _Key,
                       _IV);
                }
                while (false);

            }
            catch (Exception ex)
            {
                sMsg = _ut.GetLastExceptionMsg(ex);
            }
            finally
            {
                o_sPlaintext = sRes;
            }

            return sMsg;
        }


        //默认密钥向量
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        /**/
        /**/
        /**/
        /// <summary>
        /// DES加密字符串
        /// </summary>
        /// <param name="encryptString">待加密的字符串</param>
        /// <param name="encryptKey">加密密钥,要求为8位</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(string encryptString, out string o_sCiphertext)
        {
            string sMsg = null;
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes("chipmos_".Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                o_sCiphertext = Convert.ToBase64String(mStream.ToArray());
            }
            catch (Exception ex)
            {
                o_sCiphertext = encryptString;
                sMsg = _ut.GetLastExceptionMsg(ex);
            }

            return sMsg;
        }

        /**/
        /**/
        /**/
        /// <summary>
        /// DES解密字符串
        /// </summary>
        /// <param name="decryptString">待解密的字符串</param>
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</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(string decryptString, out string o_sPlaintext)
        {
            string sMsg = null;
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes("chipmos_".Substring(0, 8));
                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();
                o_sPlaintext = Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch (Exception ex)
            {
                o_sPlaintext = decryptString;
                sMsg = _ut.GetLastExceptionMsg(ex);
            }

            return sMsg;
        }

        private static char[] constant =   
        {   
          '0','1','2','3','4','5','6','7','8','9',  
          'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',   
          'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'   
        };
        public static string GetRandom(int Length)
        {
            System.Text.StringBuilder newRandom = new System.Text.StringBuilder(62);
            Random rd = new Random();
            for (int i = 0; i < Length; i++)
            {
                newRandom.Append(constant[rd.Next(62)]);
            }
            return newRandom.ToString();
        }

    }
}