C#编写DES加密、解密类

这个C#类封装的DES加密解密，可以使用默认秘钥进行加密、解密，也可以自定义秘钥进行加密、解密，调用简单方便。

示例一：

using System;
using System.Security.Cryptography;
using System.Text;
namespace DotNet.Utilities
{
  /// <summary>
  /// DES加密/解密类。
  /// </summary>
  public class DESEncrypt
  {
    public DESEncrypt()
    {
    }

    #region ========加密========

    /// <summary>
    /// 加密
    /// </summary>
    /// <param name="Text"></param>
    /// <returns></returns>
    public static string Encrypt(string Text)
    {
      return Encrypt(Text,"sharejs.com");
    }
    /// <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;
      inputByteArray=Encoding.Default.GetBytes(Text);
      des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      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();
      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)
    {
      return Decrypt(Text,"sharejs.com");
    }
    /// <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(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
      System.IO.MemoryStream ms=new System.IO.MemoryStream();
      CryptoStream cs=new CryptoStream(ms,des.CreateDecryptor(),CryptoStreamMode.Write);
      cs.Write(inputByteArray,0,inputByteArray.Length);
      cs.FlushFinalBlock();
      return Encoding.Default.GetString(ms.ToArray());
    }

    #endregion

  }
}

示例二：

///<summary><![CDATA[加密解密帮助类]]></summary>
  public class Help_Encrypt
  { 

    ///<summary><![CDATA[字符串DES加密函数]]></summary>
    ///<param name="str"><![CDATA[被加密字符串 ]]></param>
    ///<param name="key"><![CDATA[密钥 ]]></param>
    ///<returns><![CDATA[加密后字符串]]></returns>
    public static string Encode(string str, string key)
    {
      try
      {
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
        provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
        provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
        byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);
        MemoryStream stream = new MemoryStream();
        CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
        stream2.Write(bytes, 0, bytes.Length);
        stream2.FlushFinalBlock();
        StringBuilder builder = new StringBuilder();
        foreach (byte num in stream.ToArray())
        {
          builder.AppendFormat("{0:X2}", num);
        }
        stream.Close();
        return builder.ToString();
      }
      catch (Exception) { return "xxxx"; }
    }
    ///<summary><![CDATA[字符串DES解密函数]]></summary>
    ///<param name="str"><![CDATA[被解密字符串 ]]></param>
    ///<param name="key"><![CDATA[密钥 ]]></param>
    ///<returns><![CDATA[解密后字符串]]></returns>
    public static string Decode(string str, string key)
    {
      try
      {
        DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
        provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
        provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
        byte[] buffer = new byte[str.Length / 2];
        for (int i = 0; i < (str.Length / 2); i++)
        {
          int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
          buffer[i] = (byte)num2;
        }
        MemoryStream stream = new MemoryStream();
        CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
        stream2.Write(buffer, 0, buffer.Length);
        stream2.FlushFinalBlock();
        stream.Close();
        return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());
      }
      catch (Exception) { return ""; }
    }
  }
JAVADES加密解密类
package com.bgxt.messages;
import java.io.UnsupportedEncodingException;
import java.security.*;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
/**
* 字符串工具集合
* @author Liudong
*/
public class StringUtils { 

private static final String PASSWORD_CRYPT_KEY = XmlUtil.getConfig().getPasswdKey().substring(0,8);
//private final static String DES = "DES";
//private static final byte[] desKey;
//解密数据
public static String decrypt(String message,String key) throws Exception {   

    byte[] bytesrc =convertHexString(message);
    Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
    DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
    IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
    cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
    byte[] retByte = cipher.doFinal(bytesrc);
    return new String(retByte);
}
public static byte[] encrypt(String message, String key)
    throws Exception {
  Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
  DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));
  SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
  SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
  IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));
  cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
  return cipher.doFinal(message.getBytes("UTF-8"));
}
public static String encrypt(String value){
String result="";
try{
value=java.net.URLEncoder.encode(value, "utf-8");
result=toHexString(encrypt(value, PASSWORD_CRYPT_KEY)).toUpperCase();
}catch(Exception ex){
  ex.printStackTrace();
  return "";
}
return result;
}
public static byte[] convertHexString(String ss)
{
byte digest[] = new byte[ss.length() / 2];
for(int i = 0; i < digest.length; i++)
{
String byteString = ss.substring(2 * i, 2 * i + 2);
int byteValue = Integer.parseInt(byteString, 16);
digest[i] = (byte)byteValue;
}
return digest;
}
public static String toHexString(byte b[]) {
  StringBuffer hexString = new StringBuffer();
  for (int i = 0; i < b.length; i++) {
    String plainText = Integer.toHexString(0xff & b[i]);
    if (plainText.length() < 2)
      plainText = "0" + plainText;
    hexString.append(plainText);
  }
  return hexString.toString();
}
public static void main(String[] args) throws Exception {
  String value="01";
  System.out.println("加密数据:"+value);
  System.out.println("密码为:"+XmlUtil.getConfig().getPasswdKey());
  String a=encrypt( value);
  System.out.println("加密后的数据为:"+a);
}
} 

以上所述就是本文的全部内容了，希望大家能够喜欢。