我有这个客户端-服务器应用程序:在一侧加密消息,然后在另一侧解密 但在解密时出现此错误“使用填充密码解密时,输入长度必须是8的倍数” 服务器类
public class ServerApp {
public static byte[] encrypt(String input, Key k) {
try {
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, k);
byte[] data = input.getBytes();
byte[] result = cipher.doFinal(data);
return result;
} catch (Exception ex) {
return null;
}
}
public static String decrypt(byte[] cipher, Key k) {
try {
Cipher cipher1 = Cipher.getInstance("DES");
cipher1.init(Cipher.DECRYPT_MODE, k);
byte[] original = cipher1.doFinal(cipher);
return new String(original);
} catch (Exception ex) {
return null;
//Logger.getLogger(DES.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String[] args) throws NoSuchAlgorithmException {
try {
Key key=KeyGen.getSecretKey();
ServerSocket ser = new ServerSocket(3333);
System.out.println("Server Started");
Socket client = ser.accept();
DataInputStream in = new DataInputStream(client.getInputStream());
DataOutputStream out = new DataOutputStream(client.getOutputStream());
Scanner scan = new Scanner(System.in);
// SecretSocket sc = new SecretSocket(client, KeyGen.getSecretKey());
String serMsg, cliMsg, plain;
// OutputStream sout = sc.getOutputStream();
// InputStream sin = sc.getInputStream();
do {
System.out.print("You say: ");
serMsg = scan.nextLine();
// sout.write(serMsg.getBytes());
// System.out.println("cli server "+sin.read());
byte[] ci = encrypt(serMsg, KeyGen.getSecretKey());
System.out.println("encrypt " +ci.toString());
out.writeUTF(ci.toString());
plain = decrypt(ci, KeyGen.getSecretKey() );
System.out.println("decrypt " + plain);
} while (!serMsg.equals("end"));
client.close();
ser.close();
} catch (IOException ex) {
Logger.getLogger(ServerApp.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
这是客户代码
public class ClientApp {
public static byte[] encrypt(String input, Key k) {
try {
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, k);
byte[] data = input.getBytes();
byte[] result = cipher.doFinal(data);
return result;
} catch (Exception ex) {
return null;
}
}
public static String decrypt(byte[] cipher, Key k) {
try {
Cipher cipher1 = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher1.init(Cipher.DECRYPT_MODE, k);
byte[] original = cipher1.doFinal(cipher);
return new String(original);
} catch (Exception ex) {
return null;
//Logger.getLogger(DES.class.getName()).log(Level.SEVERE, null, ex);
}
}
public static void main(String[] args) throws NoSuchAlgorithmException, InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
try {
Socket s = new Socket("localhost", 3333);
DataInputStream in = new DataInputStream(s.getInputStream());
DataOutputStream out = new DataOutputStream(s.getOutputStream());
Scanner scan = new Scanner(System.in);
String serMsg, cliMsg, plain;
do {
System.out.println("server server "+in.readUTF());
serMsg = in.readUTF();
System.out.println("enc: " + serMsg);
plain = decrypt(serMsg.getBytes("UTF-8"), KeyGen.getSecretKey());
System.out.println("Server says: " + plain);
} while (!serMsg.equals("end"));
s.close();
} catch (IOException ex) {
Logger.getLogger(ClientApp.class.getName()).log(Level.SEVERE, null, ex);
}
}
我尝试过此操作(“ DES / CBC / PKCS5Padding”)和(“ UTF-8”) 但仍然是同样的问题 有帮助吗??
答案 0 :(得分:0)
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, k);
byte[] data = input.getBytes();
byte[] result = cipher.doFinal(data);
在不使用IV的情况下使用DES
就是在隐式使用DES/ECB/PKCS5Padding
。
不直接打印字节数组。 Java将仅输出可打印字符。 在打印时始终对字节数组进行编码和解码(十六进制或Base64是最常见的编码)
Base64.getEncoder().encodeToString(byteArray)