generate openssh key pair by golang

keys.go

/*
 * Genarate rsa keys.
 */

package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/x509"
	"encoding/base64"
	"encoding/pem"
	"fmt"
	"golang.org/x/crypto/ssh"
)

func main() {
	reader := rand.Reader
	bitSize := 2048

	key, _ := rsa.GenerateKey(reader, bitSize)

	publicKey, _ := ssh.NewPublicKey(&key.PublicKey)
	fmt.Println(publicKey.Type())
	data := publicKey.Marshal()
	encodeString := base64.StdEncoding.EncodeToString(data)
	fmt.Println(encodeString) // ssh-rsa form

	block := &pem.Block{
		Type: "OPENSSH PRIVATE KEY",
		Bytes: x509.MarshalPKCS1PrivateKey(key),
	}
	dd :=  pem.EncodeToMemory(block)
	fmt.Println(string(dd)) // PKCS #1 ANS.1 form
}