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certs.go
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certs.go
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package testutils
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"time"
)
func NewSelfSignedKeyPair() (tls.Certificate, error) {
// Certificate options.
cert := &x509.Certificate{
SerialNumber: big.NewInt(2019),
Subject: pkix.Name{
CommonName: "Tests",
},
IPAddresses: []net.IP{net.IPv4(127, 0, 0, 1), net.IPv6loopback},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
SubjectKeyId: []byte{1, 2, 3, 4, 6},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
// Create private key.
certPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return tls.Certificate{}, err
}
// Create certificate.
certBytes, err := x509.CreateCertificate(rand.Reader, cert, cert, &certPrivKey.PublicKey, certPrivKey)
if err != nil {
return tls.Certificate{}, err
}
// Encode certificate to PEM.
certPEM := new(bytes.Buffer)
if err := pem.Encode(certPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
}); err != nil {
return tls.Certificate{}, err
}
// Encode private key to PEM.
certPrivKeyPEM := new(bytes.Buffer)
if err := pem.Encode(certPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
}); err != nil {
return tls.Certificate{}, err
}
// Create tls.Certificate.
serverCert, err := tls.X509KeyPair(certPEM.Bytes(), certPrivKeyPEM.Bytes())
if err != nil {
return tls.Certificate{}, err
}
return serverCert, nil
}