/
makecert.go
138 lines (132 loc) · 3.44 KB
/
makecert.go
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package makecert
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"time"
)
// This package is used to create ad-hoc test CAs and certificates. It is intended to be used in tests and is
// not a general purpose certificate management library.
type CA struct {
Certificate *x509.Certificate
CertPEM []byte
Key *rsa.PrivateKey
KeyPEM []byte
Pool *x509.CertPool
}
func MakeCA(orgName string, bits int, expireDays int) (*CA, error) {
caTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{orgName},
},
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(0, 0, expireDays),
IsCA: true,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
}
ca := &CA{}
var err error
ca.Key, err = rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return nil, err
}
var caBytes []byte
caBytes, err = x509.CreateCertificate(rand.Reader, caTemplate, caTemplate, &ca.Key.PublicKey, ca.Key)
if err != nil {
return nil, err
}
ca.Certificate, err = x509.ParseCertificate(caBytes)
if err != nil {
return nil, err
}
caPEM := new(bytes.Buffer)
err = pem.Encode(caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: ca.Certificate.Raw,
})
if err != nil {
return nil, err
}
ca.CertPEM = caPEM.Bytes()
caKeyPEM := new(bytes.Buffer)
err = pem.Encode(caKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(ca.Key),
})
if err != nil {
return nil, err
}
ca.KeyPEM = caKeyPEM.Bytes()
ca.Pool = x509.NewCertPool()
ca.Pool.AppendCertsFromPEM(ca.CertPEM)
return ca, nil
}
type Cert struct {
Certificate *x509.Certificate
CertPEM []byte
Key *rsa.PrivateKey
KeyPEM []byte
TLSCert tls.Certificate
}
func (ca *CA) MakeCert(orgName string, bits int, expireDays int, ipAddresses []net.IP, dnsNames []string) (*Cert, error) {
certTemplate := &x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: pkix.Name{
Organization: []string{orgName},
},
DNSNames: dnsNames,
IPAddresses: ipAddresses,
NotBefore: time.Now(),
NotAfter: time.Now().AddDate(0, 0, expireDays),
SubjectKeyId: []byte{1},
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth},
KeyUsage: x509.KeyUsageDigitalSignature,
}
cert := &Cert{}
var err error
cert.Key, err = rsa.GenerateKey(rand.Reader, bits)
if err != nil {
return nil, err
}
var certBytes []byte
certBytes, err = x509.CreateCertificate(rand.Reader, certTemplate, ca.Certificate, &cert.Key.PublicKey, ca.Key)
if err != nil {
return nil, err
}
cert.Certificate, err = x509.ParseCertificate(certBytes)
if err != nil {
return nil, err
}
caPEM := new(bytes.Buffer)
err = pem.Encode(caPEM, &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Certificate.Raw,
})
if err != nil {
return nil, err
}
cert.CertPEM = caPEM.Bytes()
caKeyPEM := new(bytes.Buffer)
err = pem.Encode(caKeyPEM, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(cert.Key),
})
if err != nil {
return nil, err
}
cert.KeyPEM = caKeyPEM.Bytes()
cert.TLSCert, err = tls.X509KeyPair(cert.CertPEM, cert.KeyPEM)
if err != nil {
return nil, err
}
return cert, nil
}