在Cookies中使用AES進行加密和解密

Question

import java.security.InvalidKeyException; 
import java.security.Key; 
import java.security.NoSuchAlgorithmException; 

import javax.crypto.BadPaddingException; 
import javax.crypto.Cipher; 
import javax.crypto.IllegalBlockSizeException; 
import javax.crypto.NoSuchPaddingException; 
import javax.crypto.spec.SecretKeySpec; 


public class Encryption { 

    public static byte[] encrypted(String t) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException{ 
     byte[] dataToSend = t.getBytes(); 
     byte[] key = new byte[16]; 
     Cipher c = Cipher.getInstance("AES"); 
     SecretKeySpec k = new SecretKeySpec(key, "AES"); 
     c.init(Cipher.ENCRYPT_MODE, k); 
     byte[] encryptedData = c.doFinal(dataToSend); 
     return encryptedData; 
    } 
    public static byte[] decrypted(byte[] kr) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException{ 
     byte[] key = new byte[16]; 
     SecretKeySpec k = new SecretKeySpec(key, "AES"); 
     byte[] encryptedData = kr; 
     Cipher c2 = Cipher.getInstance("AES"); 
     c2.init(Cipher.DECRYPT_MODE, k); 
     byte[] data = c2.doFinal(encryptedData); 
     return data; 
    } 
    public static void main(String args[]) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException{ 

       //method1 
       System.out.println(encrypted("adsda")); 
       String f = new String (encrypted("adsda")); //working on console but not works when stores to cookies because of invalid characters 
       System.out.println(f); 
       System.out.println(new String(decrypted(f.getBytes())));// works when decrypting in console, not tried in cookies because not able encrypt 


       //method2 
       String x = encrypted("adsda").toString(); // works when stores in cookies works on console 
       System.out.println(x); 
       System.out.println(new String(decrypted(x.getBytes())));// decrypt not working both on console and cookies 
       System.out.println(decrypted(x.getBytes()).toString()); // decrypt not working both on console and cookies 


    } 
} 

我創建了一種使用AES加密和解密cookie的方法。細節是對代碼的評論。

Answer 1

您不能僅將encrypted(..)返回的byte[]轉換爲String。您需要使用不會丟失數據的編碼。

使用像Base64或甚至十六進制編碼的編碼。