forked from v2fly/v2ray-core
/
cert.go
178 lines (154 loc) · 4.32 KB
/
cert.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
package cert
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"math/big"
"time"
"github.com/anchel/v2ray-core/common"
)
//go:generate go run github.com/anchel/v2ray-core/common/errors/errorgen
type Certificate struct {
// Certificate 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
}