Create private_key and public_key size 2048 with golang for use in JWT

keygen.go

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"io/ioutil"
)

func main() {
	// Generate RSA private/public key pair
	privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		panic(err)
	}
	publicKey := &privateKey.PublicKey

	// Encode private key to PEM format and save to file
	privateKeyBytes := x509.MarshalPKCS1PrivateKey(privateKey)
	privateKeyPEM := pem.EncodeToMemory(&pem.Block{
		Type:  "RSA PRIVATE KEY",
		Bytes: privateKeyBytes,
	})
	err = ioutil.WriteFile("MYKEY/private_key.pem", privateKeyPEM, 0600)
	if err != nil {
		panic(err)
	}

	// Encode public key to PEM format and save to file
	publicKeyBytes, err := x509.MarshalPKIXPublicKey(publicKey)
	if err != nil {
		panic(err)
	}
	publicKeyPEM := pem.EncodeToMemory(&pem.Block{
		Type:  "PUBLIC KEY",
		Bytes: publicKeyBytes,
	})
	err = ioutil.WriteFile("MYKEY/public_key.pem", publicKeyPEM, 0644)
	if err != nil {
		panic(err)
	}

	fmt.Println("RSA private/public key pair generated and saved to MYKEY folder")
}