我正在使用Firebase数据库存储数据，并使用RSA算法对聊天消息进行加密。实际上，我能够加密数据并将其存储在其中，但是不幸的是，我无法解密数据，也不清楚应该在哪里调用解密方法。我有一个称为RSA的类，其中包含两个方法。第一个被加密，可以很好地工作，第二个被称为解密，我不在应有的地方。 ** RSA类代码**
public class RSA {
KeyPairGenerator kpg;
KeyPair kp;
PublicKey publicKey;
PrivateKey privateKey;
byte[] encryptedBytes, decryptedBytes;
Cipher cipher, cipher1;
String encrypted, decrypted;
//TODO:implementing Encryption method
public String Encrypt(String plain) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, IllegalBlockSizeException {
kpg = KeyPairGenerator.getInstance("RSA");
kpg.initialize(1024);
kp = kpg.genKeyPair();
publicKey = kp.getPublic();
privateKey = kp.getPrivate();
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
encryptedBytes = cipher.doFinal(plain.getBytes());
encrypted = bytesToString(encryptedBytes);
return encrypted;
}
//TODO:Here is the decryption methos
public String Decrypt(String result) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
cipher1 = Cipher.getInstance("RSA");
cipher1.init(Cipher.DECRYPT_MODE, privateKey);
decryptedBytes = cipher1.doFinal(stringToBytes(result));
decrypted = new String(decryptedBytes);
return decrypted;
}
public String bytesToString(byte[] b) {
byte[] b2 = new byte[b.length + 1];
b2[0] = 1;
System.arraycopy(b, 0, b2, 1, b.length);
return new BigInteger(b2).toString(36);
}
public byte[] stringToBytes(String s) {
byte[] b2 = new BigInteger(s, 36).toByteArray();
return Arrays.copyOfRange(b2, 1, b2.length);
}
}
消息类别
public class Messages {
private String Name, from;
private String Message;
private long Time;
public Messages() {
}
public Messages(String name, String message, long time, String from) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
Name = name;
Message = message;
Time = time;
this.from = from;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getMessage() {
return Message;
}
public void setMessage(String message) {
Message = message;
}
public long getTime() {
return Time;
}
public void setTime(long time) {
Time = time;
}
public String getFrom() {
return from;
}
public void setFrom(String from) {
this.from = from;
}
}
聊天类
private void PostMessages() {
reference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
String key = dataSnapshot.getKey();
String input = mInputText.getText().toString();
String name = dataSnapshot.child("Name").getValue().toString();
if (!input.equals("")) {
final String MessagesText = mInputText.getText().toString();
final String TextMessages = MessagesText;
if (MessagesText==""){
Toast.makeText(MainChatActivity.this, "please write a message ",Toast.LENGTH_SHORT).show();
}else {
try {
DataEncrypte = EncrypteandDicrypye.Encrypt(TextMessages).toString();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace();
}
String messagngerSender = "Messages/" + Registerid + "/" + ChatUserKey;
String messangerReciverId = "Messages/" + ChatUserKey + "/" + Registerid;
final DatabaseReference MessagesId = UserMesages.child("Messages").
child(Registerid).child(ChatUserKey).push();
String messages_pushId = MessagesId.getKey();
//String EncrypteMessage = Encrypte.Encrypt(MessagesText).toString();
Map messagesTextBody = new HashMap();
messagesTextBody.put("Message",DataEncrypte);
messagesTextBody.put("Name", name);
messagesTextBody.put("Time", ServerValue.TIMESTAMP);
messagesTextBody.put("from",Registerid);
Map messageDetails = new HashMap();
messageDetails.put(messagngerSender + "/" + messages_pushId, messagesTextBody);
messageDetails.put(messangerReciverId + "/" + messages_pushId, messagesTextBody);
UserMesages.updateChildren(messageDetails, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError != null) {
System.out.println("ChatError" + databaseError.getMessage().toString());
}
mInputText.setText("");
}
});
}
}
System.out.println("Data is exist " + dataSnapshot.child("User type").getValue().toString());
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void DisplayMessage() {
UserMesages.child("Messages").child(Registerid).child(ChatUserKey).addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s)
{
Messages messages = dataSnapshot.getValue(Messages.class);
Messageslistt.add(messages);
messagesAdapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
最后一次破坏适配器类
public class MessagesAdapter extends
RecyclerView.Adapter<MessagesAdapter.messagesViewHolder>{
private FirebaseAuth Mauth;
private List<Messages>UserMessagesList ;
public MessagesAdapter(List<Messages>UserMessagesList)
{
this.UserMessagesList = UserMessagesList;
}
@NonNull
@Override
public messagesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).
inflate(R.layout.chat_msg_row,parent,false);
Mauth = FirebaseAuth.getInstance();
return new messagesViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull messagesViewHolder holder, int position) {
String CurrentUser = Mauth.getCurrentUser().getUid();
Messages messages = UserMessagesList.get(position);
String SenderID = messages.getFrom();
System.out.println("From"+SenderID);
if (SenderID.equals(CurrentUser)){
System.out.println("SenderID"+SenderID);
holder.messagesText.setBackgroundResource(R.drawable.bubble1);
holder.messageUser.setTextColor(Color.GREEN);
holder.messagesText.setGravity(Gravity.END);
holder.messageUser.setGravity(Gravity.END);
}else {
holder.messagesText.setBackgroundResource(R.drawable.bubble2);
holder.messageUser.setTextColor(Color.BLUE);
holder.messagesText.setGravity(Gravity.START);
holder.messageUser.setGravity(Gravity.START);
}
holder.messageUser.setText(messages.getName());
holder.messagesText.setText(messages.getMessage());
}
private void ChatAppearance(boolean isMe, RecyclerView.ViewHolder holder){
}
@Override
public int getItemCount() {
return UserMessagesList.size();
}
public class messagesViewHolder extends RecyclerView.ViewHolder
{
public TextView messagesText;
public TextView messageUser;
public messagesViewHolder(View view)
{
super(view);
messagesText = (TextView)view.findViewById(R.id.Sendmessagetxt);
messageUser = (TextView)view.findViewById(R.id.author);
}
}
}
答案 0 :(得分：0)
您应该在onBindViewHolder中调用RSA的Decrypt方法，并将解密后的文本设置为messagetextView。
RSA rsa = new RSA():
String decryptedMessage = rsa.Decrypt(messages.getMessage());
holder.messagesText.setText(decryptedMessage);