使用PBEWithMD5AndDES算法完成对数据的加密和解密

谁践踏了优雅 2022-06-15 04:19 246阅读 0赞

package com.alex.security;
    
    import java.io.ByteArrayOutputStream;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.ObjectInputStream;
    import java.io.ObjectOutputStream;
    import java.security.spec.KeySpec;
    
    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.PBEKeySpec;
    import javax.crypto.spec.PBEParameterSpec;
    
    public class PBESecretKeyTest {
    
    
    	public static void main(String[] args) throws Exception{
    		//定义需要进行加密的数据
    		String data ="alex zhuang";
    		System.out.println("加密前的数据为："+data);
    		//对数据进行加密
    		secretEncrypt(data);
    		//对数据进行解密
    		secretDecrypt("D:/PBencrypted.data","D:/PBsecret.key");
    
    	}
    	
    	public static void secretEncrypt(String data) throws Exception{		
    		//使用PBEWithMD5AndDES算法获取Cipher实例
    		Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
    		//初始化密钥
    		SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
    		KeySpec keySpec = new PBEKeySpec("password".toCharArray());
    		SecretKey secretKey = keyFactory.generateSecret(keySpec);
    		//初始化Cipher为加密器
    		PBEParameterSpec parameterSpec = new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);		
    		cipher.init(Cipher.ENCRYPT_MODE, secretKey,parameterSpec);
    		
    		//对数据进行加密
    		byte[] encryptedData = cipher.doFinal(data.getBytes());
    		
    		//输出加密后的内容
    		System.out.println("加密后的数据为："+new String(encryptedData));
    		
    		//将密钥进行持久化和序列化
    		FileOutputStream keyFos = new FileOutputStream("D:/PBsecret.key");
    		ObjectOutputStream keyOos = new ObjectOutputStream(keyFos);
    		keyOos.writeObject(secretKey);
    		keyOos.close();
    		keyFos.close();
    			
    			
    		//将加密后的数据进行持久化
    		FileOutputStream encryptedDataFos = new FileOutputStream("D:/PBencrypted.data");
    		encryptedDataFos.write(encryptedData);
    		encryptedDataFos.close();
    	}
    	
    	public static void secretDecrypt(String dataPath,String keyPath) throws Exception{
    
    		//通过IO流获得密钥和加密数据
    		FileInputStream keyFis = new FileInputStream(keyPath);
    		ObjectInputStream keyOis = new ObjectInputStream(keyFis);
    		
    		//使用PBEWithMD5AndDES算法获取Cipher实例
    		Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
    		//初始化密钥
    		SecretKey secretKey = (SecretKey)keyOis.readObject();
    		keyOis.close();
    		
    		//初始化Cipher为解密器
    		PBEParameterSpec parameterSpec = new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);
    		cipher.init(Cipher.DECRYPT_MODE, secretKey,parameterSpec);
    		
    		//获得加密后的数据
    		FileInputStream encryptedDataFis = new FileInputStream(dataPath);
    		ByteArrayOutputStream bos = new ByteArrayOutputStream();
    		copyStream(encryptedDataFis,bos);
    		
    		//获得解密后的数据
    		byte[] decryptedData = cipher.doFinal(bos.toByteArray());
    		
    		bos.close();
    		encryptedDataFis.close();
    		
    		System.out.println("解密后的数据为："+new String(decryptedData));
    		
    	}
    	
    	public static void copyStream(FileInputStream fis ,ByteArrayOutputStream bos) throws Exception{
    		byte[] buf = new byte[1024];
    		int len = -1;
    		while((len=fis.read(buf))!=-1){
    			bos.write(buf,0,len);
    		}
    	}
    
    }

运行结果：

加密前的数据为：alex zhuang  
加密后的数据为：� ���.?-H���  
解密后的数据为：alex zhuang