我试图简单地加密一些文本,将其保存在文本文件中,然后加载/解密它。
使用Java网站上的教程,我一直在使用代码:
public class MainClass {
public static void main(String args[]) throws Exception {
KeyGenerator kg = KeyGenerator.getInstance("DES");
kg.init(new SecureRandom());
SecretKey key = kg.generateKey();
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
Class spec = Class.forName("javax.crypto.spec.DESKeySpec");
DESKeySpec ks = (DESKeySpec) skf.getKeySpec(key, spec);
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyfile"));
oos.writeObject(ks.getKey());
Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
c.init(Cipher.ENCRYPT_MODE, key);
CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);
PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));
pw.println("Stand and unfold yourself");
pw.close();
oos.writeObject(c.getIV());
oos.close();
}
}
保存加密的文本文件。
我一直在使用代码:
public class MainClass {
public static void main(String args[]) throws Exception {
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("keyfile"));
DESKeySpec ks = new DESKeySpec((byte[]) ois.readObject());
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey key = skf.generateSecret(ks);
Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
c.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec((byte[]) ois.readObject()));
CipherInputStream cis = new CipherInputStream(new FileInputStream("ciphertext"), c);
BufferedReader br = new BufferedReader(new InputStreamReader(cis));
System.out.println(br.readLine());
}
}
加载和解密文本文件。这给出了输出:
Stand and unfold yourself!
然后我更改了第一个函数,以便它重新使用相同的 SecretKey 而不是生成一个新的。
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("keyfile"));
DESKeySpec ks = new DESKeySpec((byte[]) ois.readObject());
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
SecretKey key = skf.generateSecret(ks);
Cipher c = Cipher.getInstance("DES/CFB8/NoPadding");
c.init(Cipher.ENCRYPT_MODE, key);
CipherOutputStream cos = new CipherOutputStream(new FileOutputStream("ciphertext"), c);
PrintWriter pw = new PrintWriter(new OutputStreamWriter(cos));
pw.println("Stand and unfold yourself");
pw.close();
但是,当我运行程序时 - 输出被打乱了!而不是上面的输出,我得到以下
F{�&;�d unfold yourself