As discussed previously, we will be using the RSA algorithm to generate the signature of our JWT, which requires the generation of private and public keys. Therefore, the first thing we must do is to generate the key pair. We can do this locally using the ssh-keygen command:
$ mkdir keys && ssh-keygen -t rsa -b 4096 -f ./keys/key
Here, we are using the -t flag to specify that we want to generate an RSA key pair, and the -b flag to specify a key with a bit size of 4,096. Lastly, we use the -f flag to specify where we want the key to be stored. This will generate a private key that looks like this (truncated for brevity):
-----BEGIN RSA PRIVATE KEY-----MIIJKAIBAAKCAgEAsTwK1Tireh3TVaJ66yUEAtLPP5tNuqwZW/kA64t7hgIRVKee1WjbKLcHIJcAcioHJnqME96M+YRaj/xvlIFSwIbY1CRPgRkqH7kHs6mnrOIvmiRT ...
