DES加密

资源读取类

package com.crypto.encrypt;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ResourceBundle;
import java.util.Locale;

  /**
   * 资源读取类
   */
public class Util {

  private static ResourceBundle resources=null;
  /**
   * 初始化资源
   */
  static {
        new Util();
    }


  public Util() {
    resources = ResourceBundle.getBundle(
          "resource.algorithm",
          Locale.getDefault());
  }
  /**
   * 读取源文件内容
   * @param filename String 文件路径
   * @throws IOException
   * @return byte[] 文件内容
   */
  public static byte[] readFile(String filename) throws IOException {

    File file =new File(filename);
    if(filename==null || filename.equals(""))
    {
      throw new NullPointerException("无效的文件路径");
    }
    long len = file.length();
    byte[] bytes = new byte[(int)len];

    BufferedInputStream bufferedInputStream=new BufferedInputStream(new FileInputStream(file));
    int r = bufferedInputStream.read( bytes );
    if (r != len)
      throw new IOException("读取文件不正确");
    bufferedInputStream.close();

    return bytes;

  }

  /**
   * 将加密的数据写入文件
   * @param data byte[]
   * @throws IOException
   */
  public static void writeFile(byte[] data,String filename) throws IOException {
    File file =new File(filename);
    file.getParentFile().mkdirs();
    BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream(file));
    bufferedOutputStream.write(data);
    bufferedOutputStream.close();

  }

  /**
   * 从jar文件里读取class
   * @param filename String
   * @throws IOException
   * @return byte[]
   */
  public byte[] readFileJar(String filename) throws IOException {
    BufferedInputStream bufferedInputStream=new BufferedInputStream(getClass().getResource(filename).openStream());
    int len=bufferedInputStream.available();
    byte[] bytes=new byte[len];
    int r=bufferedInputStream.read(bytes);
    if(len!=r)
    {
      bytes=null;
      throw new IOException("读取文件不正确");
    }
    bufferedInputStream.close();
    return bytes;
  }

  /**
   * 获得密码生成法则
   * @return String
   */
  public static String getAlgorithm()
  {
      return resources.getString("algorithm");
  }
  /**
   * 获得值
   * @param skey String
   * @return String
   */
  public static String getValue(String skey)
  {
    return resources.getString(skey);
  }
}

生成密钥

package com.crypto.encrypt;

import java.security.SecureRandom;
import javax.crypto.KeyGenerator;
import java.security.NoSuchAlgorithmException;
import javax.crypto.SecretKey;
import java.io.*;

public class CreateKey {
  String filename="";
  public CreateKey() {

  }

  /**
   * 获得密匙字节内容
   * @throws IOException
   * @return byte[]
   */
  public byte[] getKeyByte() throws IOException {
    byte[] bytes=Util.readFile(filename);
    return bytes;
  }

  public void CreateKeyFile(String filename) throws IOException,
      NoSuchAlgorithmException {
    this.filename=filename;
    if(filename==null || filename.equals(""))
    {
      throw new NullPointerException("无效的文件路径");
    }
    createKey();
  }

  /**
   * 生成密匙
   * @throws NoSuchAlgorithmException
   * @throws IOException
   */
  private void createKey() throws NoSuchAlgorithmException, IOException {
    SecureRandom secureRandom = new SecureRandom();
    // 为我们选择的DES算法生成一个KeyGenerator对象
    KeyGenerator kg = KeyGenerator.getInstance(Util.getValue("algorithm"));
    kg.init(secureRandom);
    // 生成密钥
    SecretKey key = kg.generateKey();
    // 将密钥数据保存为文件供以后使用
    Util.writeFile(key.getEncoded(),filename);
  }

  /**
   * 获得密匙文件路径
   * @return String
   */
  public String getKeyFilePath()
  {
    return filename;
  }
}

加密

package com.crypto.encrypt;

import java.security.SecureRandom;
import java.io.*;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.Cipher;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import java.lang.reflect.Constructor;
import java.security.spec.KeySpec;
import java.lang.reflect.InvocationTargetException;

public class EncryptData {

  private String keyfile=null;

  public EncryptData() {
  }

  public EncryptData(String keyfile) {
    this.keyfile=keyfile;
  }

  /**
   * 加密文件
   * @param filename String 源路径
   * @param filenamekey String 加密后的路径
   */
  public void createEncryptData(String filename,String filenamekey) throws
      IllegalStateException, IllegalBlockSizeException, BadPaddingException,
      NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException,
      InvalidKeyException, IOException, InstantiationException,
      IllegalAccessException, IllegalArgumentException,
      InvocationTargetException, NoSuchMethodException, SecurityException,
      ClassNotFoundException, IllegalStateException, IllegalBlockSizeException,
      BadPaddingException, NoSuchPaddingException, InvalidKeySpecException,
      NoSuchAlgorithmException, InvalidKeyException, IOException {
    //验证keyfile
    if(keyfile==null || keyfile.equals(""))
    {
      throw new NullPointerException("无效的key文件路径");
    }

    encryptData(filename,filenamekey);
  }

  /**
   * 加密类文件
   * @param filename String 原始的类文件
   * @param encryptfile String 加密后的类文件
   */
  private void encryptData(String filename,String encryptfile) throws IOException, InvalidKeyException,
      NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException,
      NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException,
      IllegalStateException, ClassNotFoundException, SecurityException,
      NoSuchMethodException, InvocationTargetException,
      IllegalArgumentException, IllegalAccessException, InstantiationException {

    //载入待加密的文件
    byte data[]=Util.readFile(filename);
    // 执行加密操作
    byte encryptedClassData[] = getencryptData(data);
    // 保存加密后的文件，覆盖原有的类文件。
    Util.writeFile(encryptedClassData,encryptfile);
  }
  /**
   * 直接获得加密数据
   * @param bytes byte[]
   * @return byte[]
   */
  public byte[] createEncryptData(byte[] bytes) throws IllegalStateException,
      IllegalBlockSizeException, BadPaddingException, InvalidKeyException,
      NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException,
      InstantiationException, IllegalAccessException, IllegalArgumentException,
      InvocationTargetException, NoSuchMethodException, SecurityException,
      ClassNotFoundException, IOException {
    bytes=getencryptData(bytes);
    return bytes;
  }

          /**
           * 加密业务方法
           * @param bytes byte[] 待加密数据
           * @return byte[] 加密后数据
           */
      private byte[] getencryptData(byte[] bytes) throws IOException,
      ClassNotFoundException, SecurityException, NoSuchMethodException,
      InvocationTargetException, IllegalArgumentException,
      IllegalAccessException, InstantiationException, NoSuchAlgorithmException,
      InvalidKeySpecException, NoSuchPaddingException, NoSuchAlgorithmException,
      InvalidKeyException, BadPaddingException, IllegalBlockSizeException,
      IllegalStateException {
    // 产生一个可信任的随机数源
    SecureRandom sr = new SecureRandom();
    //从密钥文件key Filename中得到密钥数据
    byte[] rawKeyData = Util.readFile(keyfile);
    // 从原始密钥数据创建DESKeySpec对象
    Class classkeyspec=Class.forName(Util.getValue("keyspec"));
    Constructor constructor = classkeyspec.getConstructor(new Class[]{byte[].class});
    KeySpec dks = (KeySpec)constructor.newInstance(new Object[]{rawKeyData});
    // 创建一个密钥工厂，然后用它把DESKeySpec转换成SecretKey对象
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(Util.getAlgorithm());
    SecretKey key = keyFactory.generateSecret(dks);
    // Cipher对象实际完成加密操作
    Cipher cipher = Cipher.getInstance(Util.getAlgorithm());
    // 用密钥初始化Cipher对象
    cipher.init(Cipher.ENCRYPT_MODE, key, sr);
    // 执行加密操作
    bytes = cipher.doFinal(bytes);
    // 返回字节数组
    return bytes;
  }
  /**
   * 设置key文件路径
   * @param keyfile String
   */
  public void setKeyFile(String keyfile)
  {
    this.keyfile=keyfile;
  }
}

解密

package com.crypto.encrypt;

import java.security.SecureRandom;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.SecretKey;
import javax.crypto.Cipher;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import java.security.spec.KeySpec;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.io.ByteArrayInputStream;

public class UnEncryptData {

  private String keyfile="";

  public UnEncryptData() {}

  public UnEncryptData(String keyfile) {this.keyfile=keyfile;}

  public void createUnEncryptData(String encryptfile,String filename) throws
      IllegalStateException, IllegalBlockSizeException, BadPaddingException,
      NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException,
      InvalidKeyException, IOException, NoSuchMethodException,
      SecurityException, InstantiationException, IllegalAccessException,
      IllegalArgumentException, InvocationTargetException,
      ClassNotFoundException, IllegalStateException, IllegalBlockSizeException,
      BadPaddingException, NoSuchPaddingException, InvalidKeySpecException,
      NoSuchAlgorithmException, InvalidKeyException, IOException {
    //验证keyfile
    if(keyfile==null || keyfile.equals("")){
      throw new NullPointerException("无效的key文件路径");
    }
    unEncryptData(encryptfile,filename);
  }
  /**
   * 解密类文件
   * @param encryptfile String 经过加密的文件
   * @param filename String 解密后的文件
   */
  private void unEncryptData(String encryptfile,String filename) throws
      IOException, IllegalStateException, IllegalBlockSizeException,
      BadPaddingException, InvalidKeyException, NoSuchPaddingException,
      InvalidKeySpecException, NoSuchAlgorithmException, InstantiationException,
      IllegalAccessException, IllegalArgumentException,
      InvocationTargetException, NoSuchMethodException, SecurityException,
      ClassNotFoundException, IOException {
    // 获得经过加密的数据
    byte[] data = Util.readFile(encryptfile);
    //执行解密操作
    byte decryptedData[] = getunEncryptData(data);
    // 然后将解密后的数据转化成原来的类文件。
    Util.writeFile(decryptedData,filename);
  }
  /**
   * 解密字节数组
   * @param bytes byte[]
   * @return byte[]
   */
  public byte[] createUnEncryptData(byte[] bytes) throws IllegalStateException,
      IllegalBlockSizeException, BadPaddingException, InvalidKeyException,
      NoSuchPaddingException, InvalidKeySpecException, NoSuchAlgorithmException,
      InstantiationException, IllegalAccessException, IllegalArgumentException,
      InvocationTargetException, NoSuchMethodException, SecurityException,
      ClassNotFoundException, IOException {
    bytes = getunEncryptData(bytes);
    return bytes;
  }
  /**
   *
   * @param bytes byte[]
   * @return byte[]
   */
  private byte[] getunEncryptData(byte[] bytes) throws IOException,
      ClassNotFoundException, SecurityException, NoSuchMethodException,
      InvocationTargetException, IllegalArgumentException,
      IllegalAccessException, InstantiationException, NoSuchAlgorithmException,
      InvalidKeySpecException, NoSuchPaddingException, NoSuchAlgorithmException,
      InvalidKeyException, BadPaddingException, IllegalBlockSizeException,
      IllegalStateException {
    // 生成一个可信任的随机数源
    SecureRandom sr = new SecureRandom();
    // 从密钥文件中获取原始密钥数据
    byte[] rawKeyData = Util.readFile(keyfile);
    // 创建一个DESKeySpec对象
    Class classkeyspec=Class.forName(Util.getValue("keyspec"));
    Constructor constructor = classkeyspec.getConstructor(new Class[]{byte[].class});
    KeySpec dks = (KeySpec) constructor.newInstance(new Object[]{rawKeyData}); //new DESKeySpec(rawKeyData);
    // 创建一个密钥工厂，然后用它把DESKeySpec对象转换成Secret Key对象
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(Util.getAlgorithm());
    SecretKey key = keyFactory.generateSecret(dks);
    // Cipher对象实际完成解密操作
    Cipher cipher = Cipher.getInstance(Util.getAlgorithm());
    // 用密钥初始化Cipher对象
    cipher.init(Cipher.DECRYPT_MODE, key, sr);
    // 获得经过加密的数据
    //执行解密操作
    bytes = cipher.doFinal(bytes);
    // 然后将解密后的数据转化成原来的类文件。
    return bytes;
  }
  public void setKeyFile(String keyfile){this.keyfile=keyfile;}
}

algorithm.properties资源文件

algorithm=DES
keyspec=javax.crypto.spec.DESKeySpec
keypath=src/resource/key

测试类

package com.crypto.encrypt;

import java.security.*;

import java.io.*;
import java.lang.reflect.*;
import java.security.spec.*;
import javax.crypto.*;
import javax.crypto.*;
import javax.crypto.*;
import sun.security.provider.MD5;

public class TestEncrypt {
    public TestEncrypt() {
    }

    /**
     * 创建KEY
     * @param keyPath String 生成密钥路径
     */
    public void createKey(String keyPath){
        CreateKey ck = new CreateKey();
        try {
            ck.CreateKeyFile(keyPath);
        } catch (NoSuchAlgorithmException ex) {ex.printStackTrace();
        } catch (IOException ex) {ex.printStackTrace();
        }
    }

    /**
     * 加密
     * @param sourcePath String 待加密文件路径
     * @param distinationPath String 文件加密后保存路径
     * @param keyPath String 密匙文件路径
     */
    public void encrypt(String sourcePath,String distinationPath,String keyPath){
        EncryptData enc = new EncryptData(keyPath);
        try {
            enc.createEncryptData(sourcePath, distinationPath);
        } catch (ClassNotFoundException ex) {ex.printStackTrace();
        } catch (SecurityException ex) {ex.printStackTrace();
        } catch (NoSuchMethodException ex) {ex.printStackTrace();
        } catch (InvocationTargetException ex) {ex.printStackTrace();
        } catch (IllegalArgumentException ex) {ex.printStackTrace();
        } catch (IllegalAccessException ex) {ex.printStackTrace();
        } catch (InstantiationException ex) {ex.printStackTrace();
        } catch (IOException ex) {ex.printStackTrace();
        } catch (InvalidKeyException ex) {ex.printStackTrace();
        } catch (NoSuchAlgorithmException ex) {ex.printStackTrace();
        } catch (InvalidKeySpecException ex) {ex.printStackTrace();
        } catch (NoSuchPaddingException ex) {ex.printStackTrace();
        } catch (BadPaddingException ex) {ex.printStackTrace();
        } catch (IllegalBlockSizeException ex) {ex.printStackTrace();
        } catch (IllegalStateException ex) {ex.printStackTrace();
        }
    }

    /**
     * 解密文件
     * @param sourcePath String 待解密文件路径
     * @param distinationPath String  解密后文件路径
     * @param keyPath String 密钥路径
     */
    public void unEncrypt(String sourcePath,String distinationPath,String keyPath){
       UnEncryptData unEnc = new UnEncryptData(keyPath);
    try {
        unEnc.createUnEncryptData(sourcePath,distinationPath);
    } catch (ClassNotFoundException ex) {ex.printStackTrace();
    } catch (InvocationTargetException ex) {ex.printStackTrace();
    } catch (IllegalArgumentException ex) {ex.printStackTrace();
    } catch (IllegalAccessException ex) {ex.printStackTrace();
    } catch (InstantiationException ex) {ex.printStackTrace();
    } catch (SecurityException ex) {ex.printStackTrace();
    } catch (NoSuchMethodException ex) {ex.printStackTrace();
    } catch (IOException ex) {ex.printStackTrace();
    } catch (InvalidKeyException ex) {ex.printStackTrace();
    } catch (NoSuchAlgorithmException ex) {ex.printStackTrace();
    } catch (InvalidKeySpecException ex) {ex.printStackTrace();
    } catch (NoSuchPaddingException ex) {ex.printStackTrace();
    } catch (BadPaddingException ex) {ex.printStackTrace();
    } catch (IllegalBlockSizeException ex) {ex.printStackTrace();
    } catch (IllegalStateException ex) {ex.printStackTrace();
    }
    }

    public static void main(String[] args) {
        TestEncrypt e = new TestEncrypt();
        e.createKey("classes\\resource\\key1");
        e.encrypt("classes\\resource\\a.txt","classes\\resource\\ena.txt","classes\\resource\\key1");
        e.unEncrypt("classes\\resource\\ena.txt","classes\\resource\\una.txt","classes\\resource\\key1");
    }
}