Generate unique key in Java

Question

We are migrating a server project coded using NodeJs to one coded in Java. I'm not very into the cryptography thing but I need to "translate" the following instruction to Java.

crypto.randomBytes(32).toString('hex');

Basically in the node js project they were using the js library crypto to generate a unique key, and I would need to do the same, no more, no less, in java. Anyone with crypto knowledge that can help here? What would be the equivalent in Java?

Thanks

Answer 1

You could probably use something like this

import java.util.uuid;
...

UUID  newUUID = UUID.randomUUID();

String.valueOf(newUUID);

...

Answer 2

You can use the UUID from java:

UUID.randomUUID()

Through a quick search on google I got https://paragonie.com/blog/2016/05/how-generate-secure-random-numbers-in-various-programming-languages , have a look and for your case the closest thing will be:

SecureRandom csprng = new SecureRandom();
byte[] randomBytes = new byte[32];
csprng.nextBytes(randombytes);

This is in the blog. Hope it helps.

Answer 3

You can use

Random.nextBytes(byte[] bytes) 

to populate a random byte array and then convert the bytes to hex using the strategies discussed here

Answer 4

Try this:

SecureRandom random = new SecureRandom();
new BigInteger(256, random).toString(32);