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certificate.go
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certificate.go
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package x509
import (
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"time"
"github.com/pkg/errors"
)
func CreateSelfSignedCert(certIPs []string, certDNSNames []string) (certPEM, keyPEM []byte, err error) {
// generate a new key-pair
rootKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return
}
// generate cert template used to self-sign
certTmpl, err := certTemplate(certDNSNames[0])
if err != nil {
return
}
certTmpl.IsCA = true
certTmpl.KeyUsage = x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature
certTmpl.ExtKeyUsage = []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth}
certTmpl.DNSNames = certDNSNames
// parse ips
for _, ip := range certIPs {
certTmpl.IPAddresses = append(certTmpl.IPAddresses, net.ParseIP(ip))
}
// generate self-signed certificate
certDER, err := x509.CreateCertificate(rand.Reader, certTmpl, certTmpl, &rootKey.PublicKey, rootKey)
if err != nil {
return
}
// convert cert/key to PEM format
certPEM = pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certDER,
})
keyPEM = pem.EncodeToMemory(&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(rootKey),
})
return
}
func certTemplate(commonName string) (*x509.Certificate, error) {
// generate a random serial number
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, errors.Wrap(err, "failed to generate new serial number")
}
now := time.Now()
tmpl := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Domino Data Lab, Inc."},
CommonName: commonName,
},
SignatureAlgorithm: x509.SHA256WithRSA,
NotBefore: now,
NotAfter: now.AddDate(10, 0, 0),
BasicConstraintsValid: true,
}
return &tmpl, nil
}