gen_rsa_key.go

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/pem"
	"io"
	"log"
	"os"
)

func main() {
	priv, err := rsa.GenerateKey(rand.Reader, 2048)
	privDer := x509.MarshalPKCS1PrivateKey(priv)
	if err != nil {
		log.Fatal(err)
	}
	pubkey := priv.Public()
	pubDer, err := x509.MarshalPKIXPublicKey(pubkey)
	if err != nil {
		log.Fatal(err)
	}

	pemblock := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: privDer}
	pubblock := &pem.Block{Type: "RSA PUBLIC KEY", Bytes: pubDer}
	privFile, err := os.OpenFile("./rsa_keys/foo_rsa", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	defer close(privFile)
	pubFile, err := os.OpenFile("./rsa_keys/foo_rsa.pub", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
	defer close(pubFile)
	if err != nil {
		log.Fatal(err)
	}
	err = pem.Encode(privFile, pemblock)
	if err != nil {
		log.Fatal(err)
	}
	err = pem.Encode(pubFile, pubblock)
	if err != nil {
		log.Fatal(err)
	}
}

func close(c io.Closer) {
	err := c.Close()
	if err != nil {
		log.Fatal(err)
	}
}