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|
package cert
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"math/big"
"time"
"v2ray.com/core/common"
)
//go:generate go run v2ray.com/core/common/errors/errorgen
type Certificate struct {
// Cerificate in ASN.1 DER format
Certificate []byte
// Private key in ASN.1 DER format
PrivateKey []byte
}
func ParseCertificate(certPEM []byte, keyPEM []byte) (*Certificate, error) {
certBlock, _ := pem.Decode(certPEM)
if certBlock == nil {
return nil, newError("failed to decode certificate")
}
keyBlock, _ := pem.Decode(keyPEM)
if keyBlock == nil {
return nil, newError("failed to decode key")
}
return &Certificate{
Certificate: certBlock.Bytes,
PrivateKey: keyBlock.Bytes,
}, nil
}
func (c *Certificate) ToPEM() ([]byte, []byte) {
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: c.Certificate}),
pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: c.PrivateKey})
}
type Option func(*x509.Certificate)
func Authority(isCA bool) Option {
return func(cert *x509.Certificate) {
cert.IsCA = isCA
}
}
func NotBefore(t time.Time) Option {
return func(c *x509.Certificate) {
c.NotBefore = t
}
}
func NotAfter(t time.Time) Option {
return func(c *x509.Certificate) {
c.NotAfter = t
}
}
func DNSNames(names ...string) Option {
return func(c *x509.Certificate) {
c.DNSNames = names
}
}
func CommonName(name string) Option {
return func(c *x509.Certificate) {
c.Subject.CommonName = name
}
}
func KeyUsage(usage x509.KeyUsage) Option {
return func(c *x509.Certificate) {
c.KeyUsage = usage
}
}
func Organization(org string) Option {
return func(c *x509.Certificate) {
c.Subject.Organization = []string{org}
}
}
func MustGenerate(parent *Certificate, opts ...Option) *Certificate {
cert, err := Generate(parent, opts...)
common.Must(err)
return cert
}
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
case ed25519.PrivateKey:
return k.Public().(ed25519.PublicKey)
default:
return nil
}
}
func Generate(parent *Certificate, opts ...Option) (*Certificate, error) {
var (
pKey interface{}
parentKey interface{}
err error
)
// higher signing performance than RSA2048
selfKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, newError("failed to generate self private key").Base(err)
}
parentKey = selfKey
if parent != nil {
if _, e := asn1.Unmarshal(parent.PrivateKey, &ecPrivateKey{}); e == nil {
pKey, err = x509.ParseECPrivateKey(parent.PrivateKey)
} else if _, e := asn1.Unmarshal(parent.PrivateKey, &pkcs8{}); e == nil {
pKey, err = x509.ParsePKCS8PrivateKey(parent.PrivateKey)
} else if _, e := asn1.Unmarshal(parent.PrivateKey, &pkcs1PrivateKey{}); e == nil {
pKey, err = x509.ParsePKCS1PrivateKey(parent.PrivateKey)
}
if err != nil {
return nil, newError("failed to parse parent private key").Base(err)
}
parentKey = pKey
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, newError("failed to generate serial number").Base(err)
}
template := &x509.Certificate{
SerialNumber: serialNumber,
NotBefore: time.Now().Add(time.Hour * -1),
NotAfter: time.Now().Add(time.Hour),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
for _, opt := range opts {
opt(template)
}
parentCert := template
if parent != nil {
pCert, err := x509.ParseCertificate(parent.Certificate)
if err != nil {
return nil, newError("failed to parse parent certificate").Base(err)
}
parentCert = pCert
}
derBytes, err := x509.CreateCertificate(rand.Reader, template, parentCert, publicKey(selfKey), parentKey)
if err != nil {
return nil, newError("failed to create certificate").Base(err)
}
privateKey, err := x509.MarshalPKCS8PrivateKey(selfKey)
if err != nil {
return nil, newError("Unable to marshal private key").Base(err)
}
return &Certificate{
Certificate: derBytes,
PrivateKey: privateKey,
}, nil
}
|
