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cert.go
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cert.go
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package gproxy
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"math/big"
"net"
"time"
)
func serialNumber() (*big.Int, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
return rand.Int(rand.Reader, serialNumberLimit)
}
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
// CreateSignCert creates signed cert
func CreateSignCert(
subject pkix.Name,
priv interface{},
ca *tls.Certificate,
hosts []string) (derBytes []byte, err error) {
sn, err := serialNumber()
if err != nil {
return
}
notBefore := time.Now()
template := &x509.Certificate{
SerialNumber: sn,
Subject: subject,
NotBefore: notBefore,
NotAfter: notBefore.AddDate(10, 0, 0),
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
certificate, err := x509.ParseCertificate(ca.Certificate[0])
if err != nil {
return
}
derBytes, err = x509.CreateCertificate(
rand.Reader,
template,
certificate,
publicKey(priv),
ca.PrivateKey)
if err != nil {
return
}
return
}
// CreateRootCert creates root cert
func CreateRootCert(subject pkix.Name, priv interface{}) (derBytes []byte, err error) {
sn, err := serialNumber()
if err != nil {
return
}
notBefore := time.Now()
template := &x509.Certificate{
SerialNumber: sn,
Subject: subject,
NotBefore: notBefore,
NotAfter: notBefore.AddDate(10, 0, 0),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
derBytes, err = x509.CreateCertificate(rand.Reader, template, template, publicKey(priv), priv)
return
}