gan bantuin ane dong jadi ane lagi buat aplikasi enkrip dan dekrip nah ane mau nanya kalo key di dekrip salah ada pemberitahuan salah kalo punya ane kalo key salah bisa di decrypt tapi isi filenya kosong nah supaya ada pemberitahuan wrong key gan

nih source code ane
void enkrip1(){

try{

FileInputStream file = new FileInputStream(txtpt.getText());
FileOutputStream outStream = new FileOutputStream("Encrypt.txt.enc");
String K = txtpassword.getText();
SecretKeySpec key = new SecretKeySpec(konversiKeByte(K), "AES");
Cipher enc = Cipher.getInstance("AES");
enc.init(Cipher.ENCRYPT_MODE, key);
CipherOutputStream cos = new CipherOutputStream(outStream, enc);
byte[] buf = new byte[1024];
int read;
while((read=file.read(buf))!=-1){
cos.write(buf,0,read);
}
file.close();
outStream.flush();
cos.close();
JOptionPane.showMessageDialog(null, "The file encrypted Successfully");
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}

}

void dekrip(){
try{
FileInputStream file = new FileInputStream(txtpt.getText());
FileOutputStream outStream = new FileOutputStream("Decrypt.txt");
String K = txtpassword.getText();
SecretKeySpec key = new SecretKeySpec(konversiKeByte(K), "AES");
Cipher enc = Cipher.getInstance("AES");
enc.init(Cipher.DECRYPT_MODE, key);
CipherOutputStream cos = new CipherOutputStream(outStream, enc);
byte[] buf = new byte[1024];
int read;
while((read=file.read(buf))!=-1){
cos.write(buf,0,read);
}
file.close();
outStream.flush();
cos.close();
JOptionPane.showMessageDialog(null, "The was decrypted successfully");
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
}
}