How to generate CSR

CSR means Certificate Signing Request. CSR will be generated before giving it to CA authority.

To generate a CSR, you will need to create a key pair for your server. These two items are a digital certificate key pair and cannot be separated. If you lose your public/private key file or your password and generate a new one, your SSL Certificate will no longer match and you will need to replace the certificate.

Step 1: Create a Keystore and Private Key

Please use a recent version of the JDK for best security practices

Download from here.
You have to download jsse for high strength algorithms.

1. Create a certificate keystore and private key by executing the following command:
   
   keytool -genkey -alias <your_alias_name> -keyalg RSA -keystore <your_keystore_filename> -keysize 2048
   For example:
   
   
2. Enter and re-enter a keystore password.  Tomcat uses a default password of changeit.  Hit Enter if you want to keep the default
   password. If you use a different password, you will need to specify a custom password in the server.xml configuration file.
    
3. This command will prompt for the following X.509 attributes of the certificate:
   
   
   
   
   
   • First and last name (Common Name (CN)): Enter the domain of your website (i.e. www.myside.org) in the "first- and lastname" field.. It looks like "www.company.com" or "company.com".
   • Organizational Unit (OU): This field is optional; but can be used to help identify certificates registered to an organization. The Organizational Unit (OU) field is the name of the department or organization unit making the request.
   • Organization (O): If your company or department has an &, @, or any other symbol using the shift key in its name, you must spell out the symbol or omit it to enroll.  Example: XY & Z Corporation would be XYZ Corporation  
   • Locality or City (L): The Locality field is the city or town name, for example: Mountain View. 
   • State or Province (S): Spell out the state completely; do not abbreviate the state or province name, for example: California 
   • Country Name (C): Use the two-letter code without punctuation for country, for example: US or CA
     NOTE: Symantec certificates can only be used on Web servers using the Common Name specified during enrollment.
     For example, a certificate for the domain "domain.com" will receive a warning if accessing a site named www.domain.com
     or "secure.domain.com", because "www.domain.com" and "secure.domain.com" are different from "domain.com".
      

4. When prompted for the password for the private key alias, press Enter.  This will set the private key password to the same password used for the keystore from the previous step.
   Make note of the private key and the keystore password.  If lost they cannot be retrieved.
   
   
   
   For further information, please refer to the Tomcat Web site.

Step 2: Generate a CSR

1. Run the following command to generate the CSR:
   
   keytool -certreq -keyalg RSA -alias <your_alias_name> -file certreq.csr -keystore <your_keystore_filename>
   For example:
   
   
   
   NOTE: CSRs generated using the MD5 digest (signature) algorithm are no longer allowed.
   CSRs must be generated using SHA-1 or SHA-256/384/512Outdated versions of Java SDK may use the MD5 signature hash under RSA. It is recommended to upgrade to a more recent version of the Java SDK.
   
   Alternatively, try to specify SHA-1 using the following command:
   
   keytool -certreq -keyalg RSA -alias <your_alias_name> -file certreq.csr -keystore <your_keystore_filename> -sigalg SHA1withRSAFor example:
   
   
   
    
2. Verify your CSR
    
3. Create a copy of the keystore file. Having a back-up file of the keystore at this point can help resolve installation issues that can occur when importing the certificate into the original keystore file.
    
4. To copy and paste the file certreq.csr into the enrollment form, open the file in a text editor that does not add extra characters (Notepad or Vi are recommended).
   
   Make sure to include the "BEGIN CERTIFICATE REQUEST" and "END CERTIFICATE REQUEST" header and footer.
   
   The text file should look like this:
   
   -----BEGIN CERTIFICATE REQUEST-----
   
   [encoded data]
   
   -----END CERTIFICATE REQUEST----- 

Socket Server with SSL

Socket Server with SSL

import java.io.FileInputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.KeyStore;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLServerSocketFactory;

public class SocketServerTest{
  public static void main(String args[]) throws Exception {
   
    
    char[] storepass = "testpass".toCharArray();
    char[] keypass = "testpass".toCharArray();
    String storename = "ServerKeystore";

    SSLContext context = SSLContext.getInstance("TLS");
    KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
    FileInputStream fin = new FileInputStream(storename);
    KeyStore  ks = KeyStore.getInstance("JKS");
    ks.load(fin, storepass);
    kmf.init(ks, keypass);
    context.init(kmf.getKeyManagers(), null, null);
    SSLServerSocketFactory ssf = context.getServerSocketFactory();

    ServerSocket ss = ssf.createServerSocket(9999);
    while (true) 
   {
      Socket s = ss.accept();
      PrintStream out = new PrintStream(s.getOutputStream());
      out.print("Server Data Pushed to Client");
      out.flush();
      out.close();
      s.close();
    }

  }
}

Ref:

http://docs.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#WhySSL

SSL in java , Java scoket, SSL Socket, Adding SSL to java socket

How to add SSL to Socket in Java

// For trust Store adding to client Side
System.setProperty("javax.net.ssl.trustStore", requestTO.getKeystore());
System.setProperty("javax.net.ssl.trustStorePassword", requestTO.getStorepass());


SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
sssocket = (SSLSocket) sslsocketfactory.createSocket(requestTO.getIpaddress(), new Integer(requestTO.getPort()));
sssocket.startHandshake();
sssocket.setSoTimeout(timeout);
out = new PrintWriter(sssocket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(sssocket.getInputStream()));



// For adding on Server Side usngf Apache MINA
/*
* STEP 1: Create a FILE OBJECT
*/
//FILE_PATH = path of Keystore

FilePermission.checkReadFilePermission(FILE_PATH, "JKS");
File clientJKS = new File(FILE_PATH);
/*
* STEP2: Upload file in KeyStoreFactory
*/
final KeyStoreFactory keyStoreFactory = new KeyStoreFactory();
keyStoreFactory.setDataFile(clientJKS);
keyStoreFactory.setPassword(PASSWORD);

/*
* STEP3:GET JKS OBJECT and upload into SSLCONTEXT_FACTORY
*/
final KeyStore keyStore = keyStoreFactory.newInstance();
final SslContextFactory contextFactory = new SslContextFactory();
contextFactory.setKeyManagerFactoryKeyStore(keyStore);
contextFactory.setKeyManagerFactoryKeyStorePassword(PASSWORD);

/*
* STEP 4:RETURN SSLCONTEXT
*/
return contextFactory.newInstance();



If you want to add the SSL Debug mode then
-Djavax.net.debug=ssl:record as vm argument

References:

http://www.javanna.net/2011/07/common-ssl-issues-in-java/

http://docs.oracle.com/javase/6/docs/technotes/guides/security/jsse/JSSERefGuide.html#WhySSL

javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure

========================================================
javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure

Issue with the Server Keystore. Server keystore is not generated properly.
We have to follow the process of this link
http://javaresolutions.blogspot.com/2013/10/csr-creation-ca-certiifcate-import-ssl.html

CSR creation, CA certiifcate import, SSL Certificate Import

Steps to Create SSL Certificate:

1. We need to generate the keystore using
keytool -genkey -alias mydomain -keyalg RSA -keystore keystore.jks -keysize 2048

2. Generate the CSR out of this keystore and also export privatekey from the same.
keytool -certreq -alias mydomain -keystore keystore.jks -file mydomain.csr


3. Get the .crt file from Well known CA like VeriSign, Thawte,GoDaddy..etc.
4. Using CA.crt and privatekey from original keystore , we have to generate .pfx or .p12 file using ,
openssl pkcs12 -export -out cert-and-key.p12 -inkey privateKey.key -in CAcertificate.crt

5. Convert your existing CA certificate and private key into a PKCS12 file, and then use the keytool functionality to merge one keystore with another one. Java 6 can treat a PKCS12 file as a keystore, so putting this together, you get this:
keytool -importkeystore -deststorepass changeit -destkeypass changeit -destkeystore final-keystore.jks -srckeystore cert-and-key.p12 -srcstoretype PKCS12 -srcstorepass cert-and-key-password -alias 1
   The alias of 1 is required to choose the certificate in the source PKCS12 file, keytool isn't clever enough to figure out which certificate you want in a store containing one certificate.
 
6.   final-keystore.jks is the final keystore we have to keep in classpath to work.
 

Reference:
http://cunning.sharp.fm/2008/06/importing_private_keys_into_a.html
https://www.sslshopper.com/article-most-common-java-keytool-keystore-commands.html