go-gemini/examples/cert.go
2020-10-13 17:33:14 -04:00

84 lines
1.8 KiB
Go

// +build ignore
package main
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/pem"
"log"
"os"
"time"
"git.sr.ht/~adnano/gmi"
)
func main() {
host := "localhost"
duration := 365 * 24 * time.Hour
cert, err := gmi.NewCertificate(host, duration)
if err != nil {
log.Fatal(err)
}
if err := writeCertificate(host, cert); err != nil {
log.Fatal(err)
}
}
// writeCertificate writes the provided certificate and private key
// to path.crt and path.key respectively.
func writeCertificate(path string, cert tls.Certificate) error {
crt, err := marshalX509Certificate(cert.Leaf.Raw)
if err != nil {
return err
}
key, err := marshalPrivateKey(cert.PrivateKey)
if err != nil {
return err
}
// Write the certificate
crtPath := path + ".crt"
crtOut, err := os.OpenFile(crtPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
if _, err := crtOut.Write(crt); err != nil {
return err
}
// Write the private key
keyPath := path + ".key"
keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
if _, err := keyOut.Write(key); err != nil {
return err
}
return nil
}
// marshalX509Certificate returns a PEM-encoded version of the given raw certificate.
func marshalX509Certificate(cert []byte) ([]byte, error) {
var b bytes.Buffer
if err := pem.Encode(&b, &pem.Block{Type: "CERTIFICATE", Bytes: cert}); err != nil {
return nil, err
}
return b.Bytes(), nil
}
// marshalPrivateKey returns PEM encoded versions of the given certificate and private key.
func marshalPrivateKey(priv interface{}) ([]byte, error) {
var b bytes.Buffer
privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
return nil, err
}
if err := pem.Encode(&b, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
return nil, err
}
return b.Bytes(), nil
}