How to check what SSL Ciphers are supported by your JVM
Hello Team,
If you ever wondered what are the SSL Ciphers supported by your appliaction which running on particular JVM, then you can find it with below program.
Note: Make sure you are switched into user who is allowed to start your application.
Go to /tmp
directory and createa file named as Ciphers.java
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
import javax.net.ssl.SSLServerSocketFactory;
public class Ciphers
{
public static void main(String[] args)
throws Exception
{
SSLServerSocketFactory ssf = (SSLServerSocketFactory)SSLServerSocketFactory.getDefault();
String[] defaultCiphers = ssf.getDefaultCipherSuites();
String[] availableCiphers = ssf.getSupportedCipherSuites();
TreeMap ciphers = new TreeMap();
for(int i=0; i<availableCiphers.length; ++i )
ciphers.put(availableCiphers[i], Boolean.FALSE);
for(int i=0; i<defaultCiphers.length; ++i )
ciphers.put(defaultCiphers[i], Boolean.TRUE);
System.out.println("Default\tCipher");
for(Iterator i = ciphers.entrySet().iterator(); i.hasNext(); ) {
Map.Entry cipher=(Map.Entry)i.next();
if(Boolean.TRUE.equals(cipher.getValue()))
System.out.print('*');
else
System.out.print(' ');
System.out.print('\t');
System.out.println(cipher.getKey());
}
}
}
save the file and execute it with below commands
javac -Xlint:deprecation Ciphers.java
java Ciphers
And you will see all Ciphers supported by your JVM.
Thank you.
Reference: https://confluence.atlassian.com/stashkb/list-ciphers-used-by-jvm-679609085.html
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