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generation.go
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generation.go
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package mutualtlsconfig
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"net"
"time"
)
type CertType x509.ExtKeyUsage
const (
// ServerCertType indicates the Certificate has x509.ExtKeyUsageServerAuth set
ServerCertType CertType = CertType(x509.ExtKeyUsageServerAuth)
// ClientCertType indicates the Certificate has x509.ExtKeyUsageClientAuth set
ClientCertType CertType = CertType(x509.ExtKeyUsageClientAuth)
)
// CertificateInformation holds required information for generating a Self Signed Certificate
type CertificateInformation struct {
Begin time.Time
CommonName string
Days int
DNSNames []string
IPAddresses []net.IP
Organization string
Type CertType
}
func (c *CertificateInformation) Generate() (cert, key []byte, err error) {
var (
certBuf bytes.Buffer
keyBuf bytes.Buffer
)
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, fmt.Errorf("failed to generate private key: %w", err)
}
serialNumber, err := rand.Int(rand.Reader, new(big.Int).Lsh(big.NewInt(1), 128))
if err != nil {
return nil, nil, fmt.Errorf("failed to generate serial number: %w", err)
}
begin := c.Begin
if begin.IsZero() {
begin = time.Now()
}
template := &x509.Certificate{
BasicConstraintsValid: true,
DNSNames: c.DNSNames,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsage(c.Type)},
IPAddresses: c.IPAddresses,
IsCA: true,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
NotAfter: begin.Add(time.Duration(c.Days) * time.Hour * 24),
NotBefore: begin,
SerialNumber: serialNumber,
Subject: pkix.Name{
CommonName: c.CommonName,
Organization: []string{c.Organization},
},
}
certBytes, err := x509.CreateCertificate(rand.Reader, template, template, &priv.PublicKey, priv)
if err != nil {
return nil, nil, fmt.Errorf("failed to create certificate: %w", err)
}
b := &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
}
if err := pem.Encode(&certBuf, b); err != nil {
return nil, nil, fmt.Errorf("failed encode certificate: %w", err)
}
b = &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(priv),
}
if err := pem.Encode(&keyBuf, b); err != nil {
return nil, nil, fmt.Errorf("failed encode certificate: %w", err)
}
return certBuf.Bytes(), keyBuf.Bytes(), nil
}