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

namespace LogService
{
    public class DESEncrypt
    {
        /// <summary>
        /// DESEncrypt加密解密算法。
        /// </summary>
       
            private DESEncrypt()
            {
                //
                // TODO: 在此处添加构造函数逻辑
                //
            }

            private static string key = "znf_2018";

            /// <summary>
            /// 对称加密解密的密钥
            /// </summary>
            public static string Key
            {
                get
                {
                    return key;
                }
                set
                {
                    key = value;
                }
            }

            /// <summary>
            /// DES加密
            /// </summary>
            /// <param name="encryptString"></param>
            /// <returns></returns>
            public static string DesEncrypt(string encryptString)
            {
                byte[] keyBytes = Encoding.UTF8.GetBytes(key);
                byte[] keyIV = keyBytes;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }

            /// <summary>
            /// DES解密
            /// </summary>
            /// <param name="decryptString"></param>
            /// <returns></returns>
            public static string DesDecrypt(string decryptString)
            {
                byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
                byte[] keyIV = keyBytes;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
     
    }
}