RSA encryption/ Decryption in a client server application
- by user308806
Hi guys, probably missing something very straight forward on this, but please forgive me, I'm very naive!
Have a client server application where the client identifies its self with an RSA encrypted username & password.
Unfortunately I'm getting a "bad padding exception: data must start with zero" when i try to decrypt with the public key on the client side.
I'm fairly sure the key is correct as I have tested encrypting with public key then decrypting with private key on the client side with no problems at all. Just seems when I transfer it over the connection it messses it up somehow?!
Using PrintWriter & BufferedReader on the sockets if thats of importance.
EncodeBASE64 & DecodeBASE64 encode byte[] to 64base and vice versa respectively.
Any ideas guys??
Client side:
Socket connectionToServer = new Socket("127.0.0.1", 7050);
InputStream in = connectionToServer.getInputStream();
DataInputStream dis = new DataInputStream(in);
int length = dis.readInt();
byte[] data = new byte[length];
// dis.readFully(data);
dis.read(data);
System.out.println("The received Data*****************************************");
System.out.println("The length of bits "+ length);
System.out.println(data);
System.out.println("***********************************************************");
Decryption d = new Decryption();
byte [] ttt = d.decrypt(data);
System.out.print(data);
String ss = new String(ttt);
System.out.println("***********************");
System.out.println(ss);
System.out.println("************************");
Server Side:
in = connectionFromClient.getInputStream();
OutputStream out = connectionFromClient.getOutputStream();
DataOutputStream dataOut = new DataOutputStream(out);
LicenseList licenses = new LicenseList();
String ValidIDs = licenses.getAllIDs();
System.out.println(ValidIDs);
Encryption enc = new Encryption();
byte[] encrypted = enc.encrypt(ValidIDs);
byte[] dd = enc.encrypt(ValidIDs);
String tobesent = new String(dd);
//byte[] rsult = enc.decrypt(dd);
//String tt = String(rsult);
System.out.println("The sent data**********************************************");
System.out.println(dd);
String temp = new String(dd);
System.out.println(temp);
System.out.println("*************************************************************");
//BufferedWriter bf = new BufferedWriter(OutputStreamWriter(out));
//dataOut.write(ValidIDs.getBytes().length);
dataOut.writeInt(ValidIDs.getBytes().length);
dataOut.flush();
dataOut.write(encrypted);
dataOut.flush();
System.out.println("********Testing**************");
System.out.println("Here are the ids:::");
System.out.println(licenses.getAllIDs());
System.out.println("**********************");
//bw.write("it is working well\n");
