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cert.go
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cert.go
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/*
Copyright 2023 The Crossplane Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package utils
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"time"
)
// CreateCert create TLS certificate for given dns name
// and returns CA and key in PEM format, or an error
func CreateCert(dnsName string) (string, string, error) {
ca := &x509.Certificate{
SerialNumber: big.NewInt(2019),
Subject: pkix.Name{
Organization: []string{"Company, INC."},
Country: []string{"US"},
Province: []string{""},
Locality: []string{""},
StreetAddress: []string{""},
PostalCode: []string{""},
CommonName: dnsName,
},
DNSNames: []string{dnsName},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(10, 0, 0),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
// create our private and public key
caPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return "", "", err
}
// create the CA
caBytes, err := x509.CreateCertificate(rand.Reader, ca, ca, &caPrivKey.PublicKey, caPrivKey)
if err != nil {
return "", "", err
}
// pem encode
caPEM := new(bytes.Buffer)
err = pem.Encode(caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
})
if err != nil {
return "", "", err
}
keyPEM := new(bytes.Buffer)
err = pem.Encode(keyPEM, &pem.Block{
Type: "PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(caPrivKey),
})
if err != nil {
return "", "", err
}
return caPEM.String(), keyPEM.String(), nil
}