using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;using System.Text;
using System.Security.Cryptography;
using System.IO;namespace EallNum.Helper
{public class FI_DesTools{private FI_DesTools() {} private static string key = "×××××"; /// <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 strEncryptString) {StringBuilder strRetValue = new StringBuilder();try{byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8)); byte[] keyIV = keyBytes;byte[] inputByteArray = Encoding.UTF8.GetBytes(strEncryptString); DESCryptoServiceProvider provider = new DESCryptoServiceProvider();provider.Mode = CipherMode.ECB;//兼容其他语言的Des加密算法  provider.Padding = PaddingMode.Zeros;//自动补0
                          MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); //不使用base64编码//return Convert.ToBase64String(mStream.ToArray()); //组织成16进制字符串            foreach (byte b in mStream.ToArray()){strRetValue.AppendFormat("{0:X2}", b);}}catch (Exception e){Console.WriteLine(e);}return strRetValue.ToString();} /// <summary> /// DES解密 /// </summary> /// <param name="decryptString"></param> /// <returns></returns>         public static string DesDecrypt(string strDecryptString){string strRetValue = "";try{   byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));byte[] keyIV = keyBytes;//不使用base64解码//byte[] inputByteArray = Convert.FromBase64String(decryptString);//16进制转换为byte字节byte[] inputByteArray = new byte[strDecryptString.Length / 2];for (int x = 0; x < strDecryptString.Length / 2; x++){int i = (Convert.ToInt32(strDecryptString.Substring(x * 2, 2), 16));inputByteArray[x] = (byte)i;}DESCryptoServiceProvider provider = new DESCryptoServiceProvider();provider.Mode = CipherMode.ECB;//兼容其他语言的Des加密算法  provider.Padding = PaddingMode.Zeros;//自动补0
MemoryStream mStream = new MemoryStream();CryptoStream cStream = new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();//需要去掉结尾的null字符//strRetValue = Encoding.UTF8.GetString(mStream.ToArray());strRetValue = Encoding.UTF8.GetString(mStream.ToArray()).TrimEnd('\0');}catch (Exception e){Console.WriteLine(e);}return strRetValue;}}
}