Update examples/cert.go

examples/cert.go

@@ -3,10 +3,6 @@
 package main
 
 import (
-	"bytes"
-	"crypto/tls"
-	"crypto/x509"
-	"encoding/pem"
 	"fmt"
 	"log"
 	"os"
@@ -33,63 +29,9 @@ func main() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	if err := writeCertificate(host, cert); err != nil {
+	certPath := host + ".crt"
+	keyPath := host + ".key"
+	if err := gemini.WriteCertificate(cert, certPath, keyPath); 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
-}