status-go/vendor/github.com/anacrolix/missinggo/v2/selfcert.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
}