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certificates.go
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certificates.go
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package certificates
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"os"
"time"
)
const (
permissions = 0600
rsaKeySize = 4096
serialNumberLimitBits = 128
)
var (
ipv4Loopback = net.IPv4(127, 0, 0, 1) //nolint:gomnd
ipv6Loopback = net.IPv6loopback
)
type Certificate struct {
certFile string
keyFile string
certTemplate *x509.Certificate
certPrivKey *rsa.PrivateKey
}
type CACertificate struct {
Certificate
}
func NewTestCACertificate(caCertPath, caKeyPath string) (*CACertificate, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), serialNumberLimitBits)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
ca := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Company, INC."},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(0, 0, 1),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
caPrivKey, err := rsa.GenerateKey(rand.Reader, rsaKeySize)
if err != nil {
return nil, err
}
caBytes, err := x509.CreateCertificate(rand.Reader, ca, ca, &caPrivKey.PublicKey, caPrivKey)
if err != nil {
return nil, err
}
caPEM := new(bytes.Buffer)
err = pem.Encode(caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: caBytes,
})
if err != nil {
return nil, err
}
err = os.WriteFile(caCertPath, caPEM.Bytes(), permissions)
if err != nil {
return nil, err
}
caPrivateKeyPEM := new(bytes.Buffer)
err = pem.Encode(caPrivateKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(caPrivKey),
})
if err != nil {
return nil, err
}
err = os.WriteFile(caKeyPath, caPrivateKeyPEM.Bytes(), permissions)
if err != nil {
return nil, err
}
return &CACertificate{
Certificate: Certificate{
certFile: caCertPath,
keyFile: caKeyPath,
certTemplate: ca,
certPrivKey: caPrivKey,
},
}, nil
}
func (c *CACertificate) CreateTestSignedCertificate(certPath, keyPath string) (*Certificate, error) {
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), serialNumberLimitBits)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
cert := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Test Server"},
},
IPAddresses: []net.IP{ipv4Loopback, ipv6Loopback},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(0, 0, 1),
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
certPrivKey, err := rsa.GenerateKey(rand.Reader, rsaKeySize)
if err != nil {
return nil, err
}
certBytes, err := x509.CreateCertificate(rand.Reader, cert, c.certTemplate, &certPrivKey.PublicKey, c.certPrivKey)
if err != nil {
return nil, err
}
certPEM := new(bytes.Buffer)
err = pem.Encode(certPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
})
if err != nil {
return nil, err
}
err = os.WriteFile(certPath, certPEM.Bytes(), permissions)
if err != nil {
return nil, err
}
certPrivKeyPEM := new(bytes.Buffer)
err = pem.Encode(certPrivKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(certPrivKey),
})
if err != nil {
return nil, err
}
err = os.WriteFile(keyPath, certPrivKeyPEM.Bytes(), permissions)
if err != nil {
return nil, err
}
return &Certificate{
certFile: certPath,
keyFile: keyPath,
certTemplate: cert,
}, nil
}