61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package missinggo
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"log"
|
|
"math/big"
|
|
"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
|
|
}
|
|
}
|
|
|
|
// Creates a self-signed certificate in memory for use with tls.Config.
|
|
func NewSelfSignedCertificate() (cert tls.Certificate, err error) {
|
|
cert.PrivateKey, err = rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
return
|
|
}
|
|
notBefore := time.Now()
|
|
notAfter := notBefore.Add(365 * 24 * time.Hour)
|
|
|
|
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
|
|
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
|
|
if err != nil {
|
|
log.Fatalf("failed to generate serial number: %s", err)
|
|
}
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: serialNumber,
|
|
Subject: pkix.Name{
|
|
Organization: []string{"Acme Co"},
|
|
},
|
|
NotBefore: notBefore,
|
|
NotAfter: notAfter,
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
|
|
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
|
|
BasicConstraintsValid: true,
|
|
}
|
|
|
|
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(cert.PrivateKey), cert.PrivateKey)
|
|
if err != nil {
|
|
log.Fatalf("Failed to create certificate: %s", err)
|
|
}
|
|
cert.Certificate = [][]byte{derBytes}
|
|
return
|
|
}
|