forked from coreos/etcd-ca
-
Notifications
You must be signed in to change notification settings - Fork 0
/
key.go
151 lines (129 loc) · 3.6 KB
/
key.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
package pkix
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"encoding/asn1"
"encoding/pem"
"errors"
"math/big"
)
const (
rsaPrivateKeyPEMBlockType = "RSA PRIVATE KEY"
)
// CreateRSAKey creates a new Key using RSA algorithm
func CreateRSAKey(rsaBits int) (*Key, error) {
priv, err := rsa.GenerateKey(rand.Reader, rsaBits)
if err != nil {
return nil, err
}
return NewKey(&priv.PublicKey, priv), nil
}
type Key struct {
Public crypto.PublicKey
Private crypto.PrivateKey
// TODO(yichengq): add pemEncryptedBlock *pem.Block
}
func NewKey(pub crypto.PublicKey, priv crypto.PrivateKey) *Key {
return &Key{Public: pub, Private: priv}
}
// NewKeyFromPrivateKeyPEM inits Key from PEM-format rsa private key bytes
func NewKeyFromPrivateKeyPEM(data []byte) (*Key, error) {
pemBlock, _ := pem.Decode(data)
if pemBlock == nil {
return nil, errors.New("cannot find the next PEM formatted block")
}
if pemBlock.Type != rsaPrivateKeyPEMBlockType || len(pemBlock.Headers) != 0 {
return nil, errors.New("unmatched type or headers")
}
priv, err := x509.ParsePKCS1PrivateKey(pemBlock.Bytes)
if err != nil {
return nil, err
}
return NewKey(&priv.PublicKey, priv), nil
}
// NewKeyFromEncryptedPrivateKeyPEM inits Key from encrypted PEM-format rsa private key bytes
func NewKeyFromEncryptedPrivateKeyPEM(data []byte, password []byte) (*Key, error) {
pemBlock, _ := pem.Decode(data)
if pemBlock == nil {
return nil, errors.New("cannot find the next PEM formatted block")
}
if pemBlock.Type != rsaPrivateKeyPEMBlockType {
return nil, errors.New("unmatched type or headers")
}
b, err := x509.DecryptPEMBlock(pemBlock, password)
if err != nil {
return nil, err
}
priv, err := x509.ParsePKCS1PrivateKey(b)
if err != nil {
return nil, err
}
return NewKey(&priv.PublicKey, priv), nil
}
// ExportPrivate exports PEM-format private key
func (k *Key) ExportPrivate() ([]byte, error) {
var privPEMBlock *pem.Block
switch priv := k.Private.(type) {
case *rsa.PrivateKey:
privBytes := x509.MarshalPKCS1PrivateKey(priv)
privPEMBlock = &pem.Block{
Type: rsaPrivateKeyPEMBlockType,
Bytes: privBytes,
}
default:
return nil, errors.New("only RSA private key is supported")
}
buf := new(bytes.Buffer)
if err := pem.Encode(buf, privPEMBlock); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// ExportEncryptedPrivate exports encrypted PEM-format private key
func (k *Key) ExportEncryptedPrivate(password []byte) ([]byte, error) {
var privBytes []byte
switch priv := k.Private.(type) {
case *rsa.PrivateKey:
privBytes = x509.MarshalPKCS1PrivateKey(priv)
default:
return nil, errors.New("only RSA private key is supported")
}
privPEMBlock, err := x509.EncryptPEMBlock(rand.Reader, rsaPrivateKeyPEMBlockType, privBytes, password, x509.PEMCipher3DES)
if err != nil {
return nil, err
}
buf := new(bytes.Buffer)
if err := pem.Encode(buf, privPEMBlock); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
// rsaPublicKey reflects the ASN.1 structure of a PKCS#1 public key.
type rsaPublicKey struct {
N *big.Int
E int
}
// GenerateSubjectKeyId generates SubjectKeyId used in Certificate
// Id is 160-bit SHA-1 hash of the value of the BIT STRING subjectPublicKey
func GenerateSubjectKeyId(pub crypto.PublicKey) ([]byte, error) {
var pubBytes []byte
var err error
switch pub := pub.(type) {
case *rsa.PublicKey:
pubBytes, err = asn1.Marshal(rsaPublicKey{
N: pub.N,
E: pub.E,
})
if err != nil {
return nil, err
}
default:
return nil, errors.New("only RSA public key is supported")
}
hash := sha1.Sum(pubBytes)
return hash[:], nil
}