[英]encrypt a message with an password java
這是一個學校項目,我必須使用密碼加密消息。 所以我建立了與服務器的連接,看起來一切正常,但在行cipher.init(Cipher.ENCRYPT_MODE, secret);
它打破了所有的代碼,所以我不能在那之前做出一個sout
,有人可以幫助我嗎?
try {
String sName = "localhost";
int port = 8080;
Socket client = new Socket(sName, port);
OutputStream os = client.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
//String password = null;
String password = fieldPassword.getText();
char[] a = password.toCharArray();
byte[] salt = new byte[256];
SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
KeySpec spec = new PBEKeySpec(a, salt, 65536, 256);
SecretKey tmp = factory.generateSecret(spec);
SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, secret);
String msg = jTextField2.getText();
byte[] text = msg.getBytes();
byte[] ciphertext = cipher.doFinal(text);
String hex=DatatypeConverter.printHexBinary(ciphertext);
System.out.println(hex);
String sendMessage = "{'command':'send','dst':'" + jTextField1.getText() + "','msgencrypt':'" + hex +"'}";`this is json to send to the server`
bw.write(sendMessage);
bw.flush();
} catch (IOException ex) {
Logger.getLogger(NewJFrame3.class.getName()).log(Level.SEVERE, null, ex);
}catch (Exception e){
}
您正在請求密鑰大小為256位的AES密鑰:
KeySpec spec = new PBEKeySpec(a, salt, 65536, 256);
但是由於導入/導出規定 , 未修補的 JVM將不允許使用這么大的AES密鑰。
Eigther使用Unlimited Strength Jurisdiction Policy文件修補您的JVM,或使用以下方法嘗試使用128位密鑰:
KeySpec spec = new PBEKeySpec(a, salt, 65536, 128);
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