RSA Encryption in Java POC

This is a very simple Java program (using Spring Boot, of course) to demonstrate how to encrypt a string with the RSA algorithm. We use a public key to encrypt the data, and that public key will be read from a file.

How to use

Create the key pair

To create a key pair, we'll use the openssl CLI tool. Open up a terminal and run the following command to create a private key:

openssl genrsa -out privateKey.pem 2048

As you can see, we created a 2048 bit key. Next, using this private key, we'll create public key for this. For this, run the following command:

openssl rsa -in privateKey.pem -outform PEM -pubout -out public.pem

How to decrypt

In the resources directory, I have created a Python file called rsaDecrypt.py, in which I have the Python code to decrypt the encrypted string we got from the Java code.