Monthly Archives: March 2017

How to fold / unfold all regions in Visual Studio Code

With JSON files of around 900 lines, this option is very useful to have an organized view. I highly recommend to check the links, there is a lot of things you can do with Visual Studio Code, my version is 1.10.2, and the following shortcuts are working. Ctrl+K Ctrl+0 Fold (collapse) all regions Ctrl+K Ctrl+J […]

How to generate X.509 certificate in Java 1.8

Here is how to do it, the simplest way, to generate the base64 string. No complications with KeyStores or things like that. I must say that I found this code in several places over the Internet. When I tried to run it I had some exceptions, I solved them, at the time of this writing, […]

How to generate SHA256HMAC in Node.JS

Today I had to do this for my job (hash some info) and I think is a good opportunity to share the knowledge. Here is the code, you can simply copy it and paste it in a file called SHA256Hmac.js and run it. let crypto; try {     crypto = require(‘crypto’); } catch (err) { […]

How to convert byte array to hex string in Java 1.8

If you like cryptography you might know that sometimes you have a byte array which you wish to convert to hexadecimal string. In java, to this day, I haven’t found yet a native class that does it, I’ve spent several minutes on the Internet looking for something like the Base64 class. Turns out Apache commons […]

How to generate RSA key pair in Java 1.8

Recently I was wondering how to generate a private key in Java for a personal project. I found out how to generate the actual key pair with RSA algorithm. Here is the java code for that, a simple class that you can run to check how things work. import; import; import; import […]