【发布时间】：2015-12-12 03:36:43
【问题描述】：
我一直在做我自己的小项目，我正在尝试制作一个简单的密码管理器。我目前遇到的问题是让它以某种方式工作，以便在运行时将加密的密码保存到文件中，然后在再次运行时，您可以调用它，它将被解密，向您显示您的密码为您调用的用户名。
对于我想稍后添加到程序中的内容，我确实需要将加密/解密方法分开。
当前错误是：
线程“main”javax.crypto.IllegalBlockSizeException 中的异常：使用填充密码解密时输入长度必须是 16 的倍数
非常感谢任何帮助。
代码如下：
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.util.Scanner;
import javax.crypto.spec.SecretKeySpec;
public class PasswordManager3
{
static String key = "SimplePasswordMg";
static String password1 = "";
static String password2 = "";
static String username = "";
public static void main(String[] args)
throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException,
BadPaddingException, IOException
{
Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
System.out.println("Enter New to input a new password, or Retrieve to retrieve an old password:");
Scanner scanner1 = new Scanner(System.in);
String answer = scanner1.nextLine();
if(answer.equalsIgnoreCase("New")) {
System.out.println("Please enter a username: ");
Scanner scanner2 = new Scanner(System.in);
username = scanner2.nextLine();
System.out.println("Please enter a password: ");
Scanner scanner3 = new Scanner(System.in);
password1 = scanner3.nextLine();
System.out.println("Please enter your password again: ");
Scanner scanner4 = new Scanner(System.in);
password2 = scanner4.nextLine();
if (password1.equalsIgnoreCase(password2)) {
Files.write(Paths.get(username + ".txt"), encrypt(password1, cipher, aesKey));
System.out.println("Your password has been stored.");
}
else {
System.out.println("The passwords you entered did not match. Exiting password manager.");
}
}
else if(answer.equalsIgnoreCase("Retrieve")) {
System.out.println("Please enter the username you would like to retrieve the password for: ");
Scanner scanner5 = new Scanner(System.in);
username = scanner5.nextLine();
BufferedReader in = new BufferedReader(new FileReader(username + ".txt"));
String encryptedpass = in.readLine();
byte[] encryptedpass2 = encryptedpass.getBytes("UTF-8");
System.out.println(decrypt(encryptedpass2, cipher, aesKey));
}
else {
System.out.println("You entered an incorrect option, program exited.");
}
}
public static byte[] encrypt(String str, Cipher cipher, Key aesKey)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException
{
cipher.init(Cipher.ENCRYPT_MODE, aesKey);
byte[] encrypted = cipher.doFinal(key.getBytes("UTF-8"));
return encrypted;
}
public static String decrypt(byte[] byte1, Cipher cipher, Key aesKey)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException
{
cipher.init(Cipher.DECRYPT_MODE, aesKey);
String decrypted = new String(cipher.doFinal(byte1));
return decrypted;
}
}
【问题讨论】：
-
加密数据不是文本，包含它的文件也不是文本文件，不应命名为
.txt。 -
谢谢@EJP，我不太清楚为什么要存储为文本文件，我想已经很晚了，我并没有真正考虑过。再次感谢！
标签： java encryption file-io cryptography