ASCII-armored RSA key generation in Golang

main.go

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"

	"fmt"
)

var privateKey string
var keySize int = 4096 // reduce this if running in the Go playground

func main() {
	key, _ := rsa.GenerateKey(rand.Reader, keySize)

	privateKeyBytes := pem.EncodeToMemory(
		&pem.Block{
			Type:  "RSA PRIVATE KEY",
			Bytes: x509.MarshalPKCS1PrivateKey(key),
		},
	)

	privateKey = string(privateKeyBytes)
	fmt.Println(privateKey)
}