73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
/*
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* Copyright 2026 Oleg Borodin <onborodin@gmail.com>
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*
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* This work is published and licensed under a Creative Commons
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* Attribution-NonCommercial-NoDerivatives 4.0 International License.
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*
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* Distribution of this work is permitted, but commercial use and
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* modifications are strictly prohibited.
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*/
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package auxx509
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"math/big"
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"time"
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)
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func CreateSelfSignedCert(subject string, dnsNames ...string) ([]byte, []byte, error) {
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var err error
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certPem := make([]byte, 0)
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keyPem := make([]byte, 0)
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now := time.Now()
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const yearsAfter int = 10
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const keySize int = 2048
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key, err := rsa.GenerateKey(rand.Reader, keySize)
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if err != nil {
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err := fmt.Errorf("Can't create a private key: %v", err)
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return certPem, keyPem, err
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}
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keyPemBlock := pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(key),
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}
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keyPem = pem.EncodeToMemory(&keyPemBlock)
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names := make([]string, 0)
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names = append(names, subject)
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names = append(names, dnsNames...)
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tml := x509.Certificate{
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SerialNumber: big.NewInt(now.Unix()),
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NotBefore: now,
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NotAfter: now.AddDate(yearsAfter, 0, 0),
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Subject: pkix.Name{
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CommonName: subject,
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},
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DNSNames: names,
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BasicConstraintsValid: true,
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}
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certBytes, err := x509.CreateCertificate(rand.Reader, &tml, &tml, &key.PublicKey, key)
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if err != nil {
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return certPem, keyPem, fmt.Errorf("Can't create a certificate: %v", err)
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}
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certPemBlock := pem.Block{
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Type: "CERTIFICATE",
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Bytes: certBytes,
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}
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certPem = pem.EncodeToMemory(&certPemBlock)
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if err != nil {
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return certPem, keyPem, err
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}
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return certPem, keyPem, err
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}
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