Zarjio Zarjio - 1 year ago 93
Java Question

Java and SSL -

I've built a Java program as a front end for a database on a server, and I'm trying to use SSL to encrypt traffic between clients and the server. Here is the command I issued to create the server certificate:

keytool -genkey -alias localhost -keyalg RSA -keypass kpass123 -storepass kpass123 -keystore keystore.jks

Here is the relevant code:


System.setProperty("", "kpass123");

SSLServerSocketFactory factory =

SSLServerSocket accessSocket =

When I try to run this, I catch this: Error constructing implementation (algorithm: Default, provider: SunJSSE, class:

I've also found that the "KeyPairGenerator" service has algorithms DIFFIEHELLMAN, DSA, RSA available to it, while "SSLContext" has algorithms SSL, TLS, SSLV3, DEFAULT, TLSV1.

Do I need to find some way to install RSA into the SSLContext service? Am I even looking at the correct services? Should I not be using RSA?

I'm new to the whole SSL - Security - Certificates thing, and it just blows me away that each of these different services don't have the same algorithms when they are supposed to be accessing the same certificates.

Answer Source

Try instead of the latter isn't mentioned in the JSSE ref guide.

The algorithms you mention should be there by default using the default security providers. NoSuchAlgorithmExceptions are often cause by other underlying exceptions (file not found, wrong password, wrong keystore type, ...). It's useful to look at the full stack trace.

You could also use, or at least,keymanager, to get more debugging information, if the information in the stack trace isn't sufficient.