/
generate_ca_key.go
67 lines (62 loc) · 1.67 KB
/
generate_ca_key.go
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package main
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"log"
"math/big"
"os"
"time"
)
func main() {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
log.Fatalln(err)
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serial, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
log.Fatalln(err)
}
notBefore := time.Date(2020, time.January, 1, 0, 0, 0, 0, time.UTC)
notAfter := time.Now().AddDate(10, 0, 0)
template := x509.Certificate{
SerialNumber: serial,
NotBefore: notBefore,
NotAfter: notAfter,
Subject: pkix.Name{
CommonName: "gstbgen",
},
Issuer: pkix.Name{
Organization: []string{"gstbgen"},
CommonName: "gstbgen",
},
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
BasicConstraintsValid: true,
}
certB, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
log.Fatalln(err)
}
var certPem, keyPem bytes.Buffer
if err := pem.Encode(&certPem, &pem.Block{Type: "CERTIFICATE", Bytes: certB}); err != nil {
log.Fatalln(err)
}
marshaledKey := x509.MarshalPKCS1PrivateKey(priv)
if err := pem.Encode(&keyPem, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: marshaledKey}); err != nil {
log.Fatalln(err)
}
if err := os.WriteFile("gstbgen.crt", certPem.Bytes(), 0600); err != nil {
log.Fatalln(err)
}
if err := os.WriteFile("gstbgen.key", keyPem.Bytes(), 0600); err != nil {
log.Fatalln(err)
}
fmt.Println("./gstbgen.crt and ./gstbgen.key was generated.")
}