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cert.go
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cert.go
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// Generate a self-signed X.509 certificate for a TLS server.
// Based on https://go.dev/src/crypto/tls/generate_cert.go
package proxytest
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"time"
)
func NewCertificate(hosts ...string) tls.Certificate {
priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
panic(err)
}
notBefore := time.Now()
notAfter := notBefore.Add(1 * time.Hour)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
panic(err)
}
template := x509.Certificate{
IsCA: true,
SerialNumber: serialNumber,
Subject: pkix.Name{Organization: []string{"Zalando SE"}},
NotBefore: notBefore,
NotAfter: notAfter,
// ECDSA, ED25519 and RSA subject keys should have the DigitalSignature
// KeyUsage bits set in the x509.Certificate template
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
if err != nil {
panic(err)
}
certPEM := new(bytes.Buffer)
if err := pem.Encode(certPEM, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
panic(err)
}
keyPEM := new(bytes.Buffer)
privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
panic(err)
}
if err := pem.Encode(keyPEM, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
panic(err)
}
cert, err := tls.X509KeyPair(certPEM.Bytes(), keyPEM.Bytes())
if err != nil {
panic(err)
}
return cert
}