/
setup.go
113 lines (103 loc) · 3.14 KB
/
setup.go
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// Copyright © 2017 James Kimble
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/asn1"
"encoding/pem"
"math/big"
"os"
"time"
"github.com/spf13/cobra"
)
// setupCmd represents the setup command
var setupCmd = &cobra.Command{
Use: "setup",
Short: "A brief description of your command",
Long: `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
Run: func(cmd *cobra.Command, args []string) {
genCert(cmd, args)
},
}
var organization string
func init() {
RootCmd.AddCommand(setupCmd)
setupCmd.Flags().StringVarP(&name, "name", "n", "", "Certificate Name")
setupCmd.Flags().StringVarP(&organization, "organization", "o", "", "Certificate Organization")
}
func genCert(cmd *cobra.Command, args []string) error {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return err
}
notBefore := time.Now()
notAfter := notBefore.Add(10 * 365 * 24 * time.Hour)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
CommonName: name,
Organization: []string{organization},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
return err
}
certOut, err := os.Create("public.crt")
if err != nil {
return err
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
keyOut, err := os.Create("private.key")
if err != nil {
return err
}
pkcs8, err := rsa2pkcs8(priv)
if err != nil {
return err
}
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: pkcs8})
keyOut.Close()
return nil
}
type pkcs8Key struct {
Version int
PrivateKeyAlgorithm []asn1.ObjectIdentifier
PrivateKey []byte
}
func rsa2pkcs8(key *rsa.PrivateKey) ([]byte, error) {
var pkey pkcs8Key
pkey.Version = 0
pkey.PrivateKeyAlgorithm = make([]asn1.ObjectIdentifier, 1)
pkey.PrivateKeyAlgorithm[0] = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 1}
pkey.PrivateKey = x509.MarshalPKCS1PrivateKey(key)
return asn1.Marshal(pkey)
}