/
tls.go
118 lines (106 loc) · 2.79 KB
/
tls.go
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package config
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"os"
"os/exec"
"time"
)
func genPair(public, private string) error {
vf := 365 * 24 * time.Hour
validFor := &vf
var err error
var notBefore time.Time
notBefore = time.Now()
notAfter := notBefore.Add(*validFor)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return fmt.Errorf("failed to generate serial number: %s", err)
}
rootKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return err
}
keyToFile(private, rootKey)
rootTemplate := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Gophercraft"},
CommonName: "GC",
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &rootTemplate, &rootTemplate, &rootKey.PublicKey, rootKey)
if err != nil {
return err
}
certToFile(public, derBytes)
return nil
}
// keyToFile writes a PEM serialization of |key| to a new file called
// |filename|.
func keyToFile(filename string, key *ecdsa.PrivateKey) {
file, err := os.Create(filename)
if err != nil {
panic(err)
}
defer file.Close()
b, err := x509.MarshalECPrivateKey(key)
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
os.Exit(2)
}
if err := pem.Encode(file, &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}); err != nil {
panic(err)
}
}
func certToFile(filename string, derBytes []byte) {
certOut, err := os.Create(filename)
if err != nil {
log.Fatalf("failed to open cert.pem for writing: %s", err)
}
if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
log.Fatalf("failed to write data to cert.pem: %s", err)
}
if err := certOut.Close(); err != nil {
log.Fatalf("error closing cert.pem: %s", err)
}
}
// debugCertToFile writes a PEM serialization and OpenSSL debugging dump of
// |derBytes| to a new file called |filename|.
func debugCertToFile(filename string, derBytes []byte) {
cmd := exec.Command("openssl", "x509", "-text", "-inform", "DER")
file, err := os.Create(filename)
if err != nil {
panic(err)
}
defer file.Close()
cmd.Stdout = file
cmd.Stderr = os.Stderr
stdin, err := cmd.StdinPipe()
if err != nil {
panic(err)
}
if err := cmd.Start(); err != nil {
panic(err)
}
if _, err := stdin.Write(derBytes); err != nil {
panic(err)
}
stdin.Close()
if err := cmd.Wait(); err != nil {
panic(err)
}
}