package main

import (
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha1"
	"crypto/x509"
	"encoding/base32"
	"encoding/pem"
	"fmt"
	"io"
	"os"
	"time"
)

var enc = base32.NewEncoding("abcdefghijklmnopqrstuvwxyz234567")

func main() {
	pkey, err := rsa.GenerateKey(rand.Reader, 4096)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fmt.Println(pkey.D)
	fmt.Printf("%v\n", pkey.D.Bytes())

	// get the DER encoded key
	data := x509.MarshalPKCS1PrivateKey(pkey)
	fmt.Printf("%v\n", data)
	b := pem.Block{
		Bytes: data,
		Type:  "RSA PRIVATE KEY",
		Headers: map[string]string{
			"date": time.Now().String(),
		},
	}
	data = pem.EncodeToMemory(&b)
	fmt.Printf("%s\n", data)

	h := sha1.New()
	io.WriteString(h, "His money is twice tainted:")
	sum := h.Sum(nil)

	println(enc.EncodeToString(sum)[0:15])
}