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加密函数之DES

/*------------------------------NBest 快速开发框架----------------------------
	创建时间:2019-01-24 15:34:10
	作者:陈恩点
	邮箱:dvmu@163.com
	变更记录:
	时间               		变更作者    变更内容
	2019-01-24 15:34:10		陈恩点      初次创建文件
----------------------------------------------------------------------------*/
using System;
using System.Security.Cryptography;
using System.Text;

namespace NBest.Code
{
    /// <summary>
    /// DES加密、解密帮助类
    /// </summary>
    public class DES
    {
        //private static string DESKey = "U2FsdGVkX1/Tu90uxPsrsachWe9raOHJ53IbKZ9K5LM="; // 
        // 原始KEy
        private static string DESKey = "NBest_desencrypt_2016"; // U2FsdGVkX1/Tu90uxPsrsachWe9raOHJ53IbKZ9K5LM=

        #region ========加密========
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Encrypt(string Text)
        {
            return Encrypt(Text, DESKey);
        }
        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Encrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.ASCII.GetBytes(Text);
            des.Key = Encoding.ASCII.GetBytes(Md5.Encrypt(sKey).Substring(0,8));
            des.IV = Encoding.ASCII.GetBytes(Md5.Encrypt(sKey).Substring(0, 8));
            des.Mode = CipherMode.ECB;
            des.Padding = PaddingMode.PKCS7;
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            cs.Close();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }

        #endregion

        #region ========解密========
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="Text"></param>
        /// <returns></returns>
        public static string Decrypt(string Text)
        {
            if (!string.IsNullOrEmpty(Text))
            {
                return Decrypt(Text, DESKey);
            }
            else
            {
                return "";
            }
        }
        /// <summary> 
        /// 解密数据 
        /// </summary> 
        /// <param name="Text"></param> 
        /// <param name="sKey"></param> 
        /// <returns></returns> 
        public static string Decrypt(string Text, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            int len;
            len = Text.Length / 2;
            byte[] inputByteArray = new byte[len];
            int x, i;
            for (x = 0; x < len; x++)
            {
                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
                inputByteArray[x] = (byte)i;
            }
            des.Key = ASCIIEncoding.ASCII.GetBytes(Md5.Encrypt(sKey).Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(Md5.Encrypt(sKey).Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            des.Mode = CipherMode.ECB;
            des.Padding = PaddingMode.PKCS7;
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Encoding.Default.GetString(ms.ToArray());
        }

        #endregion
    }
}


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