92 lines
1.7 KiB
Go
92 lines
1.7 KiB
Go
package main
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"math/big"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
func publicKey(priv interface{}) interface{} {
|
|
switch k := priv.(type) {
|
|
case *rsa.PrivateKey:
|
|
return &k.PublicKey
|
|
case *ecdsa.PrivateKey:
|
|
return &k.PublicKey
|
|
default:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func pemBlockForKey(priv interface{}) *pem.Block {
|
|
switch k := priv.(type) {
|
|
case *rsa.PrivateKey:
|
|
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
|
|
case *ecdsa.PrivateKey:
|
|
b, err := x509.MarshalECPrivateKey(k)
|
|
if err != nil {
|
|
fmt.Fprintf(os.Stderr, "Unable to marshal ECDSA private key: %v", err)
|
|
os.Exit(2)
|
|
}
|
|
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
|
|
default:
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func generateCert(crtFile, keyFile string) error {
|
|
priv, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: big.NewInt(1),
|
|
Subject: pkix.Name{
|
|
Organization: []string{"Acme Co"},
|
|
},
|
|
NotBefore: time.Now(),
|
|
NotAfter: time.Now().Add(time.Hour * 24 * 180),
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
|
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
|
|
BasicConstraintsValid: true,
|
|
}
|
|
|
|
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
f, err := os.Create(crtFile)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pem.Encode(f, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
|
|
|
|
f.Close()
|
|
|
|
|
|
f, err = os.Create(keyFile)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
pem.Encode(f, pemBlockForKey(priv))
|
|
|
|
f.Close()
|
|
|
|
return nil
|
|
}
|