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Thread: Problem in transporting Key

  1. #1
    Junior Member
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    Question Problem in transporting Key

    I am coding a program to transmit public key from a client to server.
    // SERVER
    import java.security.Key;
    import java.security.KeyPair;
    import java.security.KeyPairGenerator;
    import java.security.SecureRandom;
    import java.security.Security;
    import javax.crypto.Cipher;
    import java.io.*;
    import java.net.*;
    class server
    {
    public static void main(String a[])throws Exception
    {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance("RSA/None/NoPadding", "BC");
        ServerSocket ss=new ServerSocket(4321);
        Socket s=ss.accept();
        BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
        System.out.println(in.readLine());
        s.close();
        ss.close();
    }
    }
    // CLIENT
    import java.security.Key;
    import java.security.KeyPair;
    import java.security.KeyPairGenerator;
    import java.security.SecureRandom;
    import java.security.Security;
    import javax.crypto.Cipher;
    import java.io.*;
    import java.net.*;
    class client
    {
    public static void main(String a[])throws Exception
    {
        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
        Cipher cipher = Cipher.getInstance("RSA/None/NoPadding", "BC");
        SecureRandom random = new SecureRandom();
        KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");
        generator.initialize(512, random);
        KeyPair pair = generator.generateKeyPair();
        Key pubKey = pair.getPublic();
        Key privKey = pair.getPrivate();
        Socket s=new Socket("localhost",4321);
        DataOutputStream out=new DataOutputStream(s.getOutputStream());
        out.write(pubKey);
        s.close();
    }
    }
    I got the following error:
    C:\jdk1.6\bin>javac test4.java
    test4.java:28: cannot find symbol
    symbol : method write(java.security.Key)
    location: class java.io.DataOutputStream
    out.write(pubKey);
    ^
    1 error
    Please somebody help me


  2. #2
    Moderators helloworld922's Avatar
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    Default Re: Problem in transporting Key

    There's no method called write in DataOutputStream that writes out the type Key. Unfortunately, Java doesn't let you use pointers so you can't pass the byte values one-by-one through the output stream. Java's website has this alternative for sending encrypted messages and the public key: Lesson 3: Cryptography

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