using System;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

using System.IO;

namespace ChalwinIssue

{

    /// <summary>

    /// 加解密类

    /// </summary>

    public class EdOperator

    {

        //密钥

        private const string sKey = "qJzGEh6hESZDVJeCnFPGuxzaiB7NLQM3";

        //向量，必须是12个字符

        private const string sIV = "andyliu1234=";

        //构造一个对称算法

        private SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();

        #region 加密解密函数

        /// <summary>

        /// 字符串的加密

        /// </summary>

        /// <param name="Value">要加密的字符串</param>

        /// <returns>加密后的字符串</returns>

        public string EncryptString(string Value)

        {

            try

            {

                ICryptoTransform ct;

                MemoryStream ms;

                CryptoStream cs;

                byte[] byt;

                mCSP.Key = Convert.FromBase64String(sKey);

                mCSP.IV = Convert.FromBase64String(sIV);

                //指定加密的运算模式

                mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;

                //获取或设置加密算法的填充模式

                mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

                ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);//创建加密对象

                byt = Encoding.UTF8.GetBytes(Value);

                ms = new MemoryStream();

                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);

                cs.Write(byt, 0, byt.Length);

                cs.FlushFinalBlock();

                cs.Close();

                return Convert.ToBase64String(ms.ToArray());

            }

            catch (Exception ex)

            {

                //MessageBox.Show(ex.Message, "出现异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                return ("Error in Encrypting " + ex.Message);

            }

        }

        /// <summary>

        /// 解密字符串

        /// </summary>

        /// <param name="Value">加密后的字符串</param>

        /// <returns>解密后的字符串</returns>

        public string DecryptString(string Value)

        {

            try

            {

                ICryptoTransform ct;//加密转换运算

                MemoryStream ms;//内存流

                CryptoStream cs;//数据流连接到数据加密转换的流

                byte[] byt;

                //将3DES的密钥转换成byte

                mCSP.Key = Convert.FromBase64String(sKey);

                //将3DES的向量转换成byte

                mCSP.IV = Convert.FromBase64String(sIV);

                mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;

                mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;

                ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);//创建对称解密对象

                byt = Convert.FromBase64String(Value);

                ms = new MemoryStream();

                cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);

                cs.Write(byt, 0, byt.Length);

                cs.FlushFinalBlock();

                cs.Close();

                return Encoding.UTF8.GetString(ms.ToArray());

            }

            catch (Exception ex)

            {

                //MessageBox.Show(ex.Message, "出现异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                return ("Error in Decrypting " + ex.Message);

            }

        }

        #endregion

    }

}