基本上我找到了这个代码，由某人发布，它允许您在 AES 中加密消息并解密它。我对这个加密东西有点陌生，我想知道，它使用的种子值在哪里，种子每次都是随机的吗？因为从表面上看，同一个String加密后的结果是不一样的。

谢谢。

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;

public class AESGUI extends JPanel {

    public static void main(String[] args) {
        JFrame frame = new JFrame("AES Encryption");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(600,300));

        frame.setLocationRelativeTo(null);
        frame.setResizable(false);

        AESGUI p = new AESGUI();

        frame.getContentPane().add(p);
        frame.pack();
        frame.setVisible(true);
    }

    private JTextField in;
    private JTextArea out;

    public AESGUI() {
        JLabel info = new JLabel("Type any String");
        in = new JTextField(20);
        JButton encrypt = new JButton("Encrypt");
        out = new JTextArea(10,40);

        out.setEditable(false);

        encrypt.addActionListener(new encryptListener());
        in.addActionListener(new encryptListener());

        add(info);
        add(in);
        add(encrypt);
        add(out);
        add(new JScrollPane(out));
    }

    private class encryptListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            String data = in.getText();
            if (data.length() == 0) { }
            else
                try {
                    String en = encrypt(data);
                    out.append("Encrypted string: " + en + "\n");
                    out.append("Original String: " + decrypt(en) + "\n\n");
                } catch(Exception ex) { }
        }
    }

    public String asHex(byte[] buf) {
        StringBuffer strbuf = new StringBuffer(buf.length * 2);
        int i;
        for (i = 0; i < buf.length; i++) {
            if (((int) buf[i] & 0xff) < 0x10)
                strbuf.append("0");
            strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
        }
        return strbuf.toString();
    }

    private SecretKeySpec skeySpec;
    private Cipher cipher;
    private byte[] encrypted;

    public String encrypt(String str) throws Exception {
        // Get the KeyGenerator
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(128); // 192 and 256 bits may not be available

        // Generate the secret key specs.
        SecretKey skey = kgen.generateKey();
        byte[] raw = skey.getEncoded();
        skeySpec = new SecretKeySpec(raw, "AES");

        // Instantiate the cipher
        cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

        encrypted = cipher.doFinal(str.getBytes());
        return asHex(encrypted);
    }

    public String decrypt(String str) throws Exception {
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
        byte[] original = cipher.doFinal(encrypted);
        String originalString = new String(original);
        return originalString;
    }

}

没有 gui(我希望这就是我删除的所有内容)

public String asHex(byte[] buf) {
    StringBuffer strbuf = new StringBuffer(buf.length * 2);
    int i;
    for (i = 0; i < buf.length; i++) {
        if (((int) buf[i] & 0xff) < 0x10)
            strbuf.append("0");
        strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
    }
    return strbuf.toString();
}

private SecretKeySpec skeySpec;
private Cipher cipher;
private byte[] encrypted;

public String encrypt(String str) throws Exception {
    // Get the KeyGenerator
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128); // 192 and 256 bits may not be available

    // Generate the secret key specs.
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    skeySpec = new SecretKeySpec(raw, "AES");

    // Instantiate the cipher
    cipher = Cipher.getInstance("AES");

    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

    encrypted = cipher.doFinal(str.getBytes());
    return asHex(encrypted);
}

public String decrypt(String str) throws Exception {
    cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    byte[] original = cipher.doFinal(encrypted);
    String originalString = new String(original);
    return originalString;
}

最佳答案

是的，它对相同的文本给出不同的结果，原因是每次加密消息时您都会生成 key 。

// Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192 and 256 bits may not be available

// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
skeySpec = new SecretKeySpec(raw, "AES");

您可以做的是，将其从 encrypt() 方法中取出并使其通用。

关于java - 为什么这个 AES 加密程序在每次调用时给出不同的值？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7302986/