如何使用Java中的密码加密和解密String（Pc不是移动平台）？ [英] How to encrypt and decrypt String with my passphrase in Java (Pc not mobile platform)?

问题描述

我想加密一个字符串，然后把它放在一个文件上。还想要解密，当我想要。我不需要很强的安全性。我只是想让我的数据变得更难。

I want to encrypt a string and then put it on a file. Also want to decrypt it when I want. I don’t need very strong security. I just want to make it harder to get my data others.

我尝试了几种方法。以下是这些。

I tried several ways. Here are these.

Md5加密：

如何在Android中排列字符串？

public static final String md5(final String toEncrypt) {
        try {
            final MessageDigest digest = MessageDigest.getInstance("md5");
            digest.update(toEncrypt.getBytes());
            final byte[] bytes = digest.digest();
            final StringBuilder sb = new StringBuilder();
            for (int i = 0; i < bytes.length; i++) {
                sb.append(String.format("%02X", bytes[i]));
            }
            return sb.toString().toLowerCase();
        } catch (Exception exc) {
            return ""; // Impossibru!
        }
    }

我尝试了这个功能，可以加密字符串，我无法从中解密数据。所以这不是解决方案。

I tried this function and able to encrypt a string but I can’t decrypt data from it. So it is not the solution.

DES加密：

加密和解密java中的String

这里密码是自动生成的。总是密码会一直都一样吗？那我的安全在哪里所以这不是我的解决方案。

Here passphrase is Auto generated. Is always passphrase will same on all time? Then where is my security. So it is not my solution too.

AES加密：

如何使用另一个字符串作为密码加密/解密字符串？

我也从这个链接尝试过Aes。这里的关键还是自动生成？

I also tried Aes from this link. Here key is also auto generated?

有没有其他的方法？

推荐答案

软件包com.example;

package com.example;
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class StrongAES 
{
    public void run() 
    {
        try 
        {
            String text = "Hello World";
            String key = "Bar12345Bar12345"; // 128 bit key
            // Create key and cipher
            Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
            Cipher cipher = Cipher.getInstance("AES");
            // encrypt the text
            cipher.init(Cipher.ENCRYPT_MODE, aesKey);
            byte[] encrypted = cipher.doFinal(text.getBytes());
            System.err.println(new String(encrypted));
            // decrypt the text
            cipher.init(Cipher.DECRYPT_MODE, aesKey);
            String decrypted = new String(cipher.doFinal(encrypted));
            System.err.println(decrypted);
        }
        catch(Exception e) 
        {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) 
    {
        StrongAES app = new StrongAES();
        app.run();
    }
}

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