Question

I want to provide my application with simple licensing mechanism based on RSA algorithm.

Are there any free RSA libraries?

Answer 1

Just use the javax.crypto and java.security packages. It’s in the Java standard platform.

KeyPair keys = KeyPairGenerator.getInstance("RSA").generateKeyPair();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, keys.getPublic());
byte[] encrypted = cipher.doFinal(rawData);

Links for the official documentation:

• Package javax.crypto documentation
• Package java.security documentation