forked from theupdateframework/go-tuf
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ecdsa.go
141 lines (123 loc) · 3.26 KB
/
ecdsa.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
package keys
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha256"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"github.com/theupdateframework/go-tuf/data"
)
func init() {
VerifierMap.Store(data.KeyTypeECDSA_SHA2_P256, newEcdsaVerifier)
SignerMap.Store(data.KeyTypeECDSA_SHA2_P256, newEcdsaSigner)
}
func newEcdsaVerifier() Verifier {
return &ecdsaVerifier{}
}
func newEcdsaSigner() Signer {
return &ecdsaSigner{}
}
type ecdsaVerifier struct {
PublicKey *data.PKIXPublicKey `json:"public"`
ecdsaKey *ecdsa.PublicKey
key *data.PublicKey
}
func (p *ecdsaVerifier) Public() string {
r, _ := x509.MarshalPKIXPublicKey(p.ecdsaKey)
return string(r)
}
func (p *ecdsaVerifier) Verify(msg, sigBytes []byte) error {
hash := sha256.Sum256(msg)
if !ecdsa.VerifyASN1(p.ecdsaKey, hash[:], sigBytes) {
return errors.New("signature verification failed")
}
return nil
}
func (p *ecdsaVerifier) MarshalPublicKey() *data.PublicKey {
return p.key
}
func (p *ecdsaVerifier) UnmarshalPublicKey(key *data.PublicKey) error {
if err := json.Unmarshal(key.Value, p); err != nil {
return err
}
ecdsaKey, ok := p.PublicKey.PublicKey.(*ecdsa.PublicKey)
if !ok {
return fmt.Errorf("invalid public key")
}
p.ecdsaKey = ecdsaKey
p.key = key
return nil
}
type ecdsaSigner struct {
*ecdsa.PrivateKey
}
type ecdsaPrivateKeyValue struct {
Private string `json:"private"`
Public *data.PKIXPublicKey `json:"public"`
}
func (s *ecdsaSigner) PublicData() *data.PublicKey {
keyValBytes, _ := json.Marshal(ecdsaVerifier{PublicKey: &data.PKIXPublicKey{PublicKey: s.Public()}})
return &data.PublicKey{
Type: data.KeyTypeECDSA_SHA2_P256,
Scheme: data.KeySchemeECDSA_SHA2_P256,
Algorithms: data.HashAlgorithms,
Value: keyValBytes,
}
}
func (s *ecdsaSigner) SignMessage(message []byte) ([]byte, error) {
hash := sha256.Sum256(message)
return ecdsa.SignASN1(rand.Reader, s.PrivateKey, hash[:])
}
func (s *ecdsaSigner) MarshalPrivateKey() (*data.PrivateKey, error) {
priv, err := x509.MarshalECPrivateKey(s.PrivateKey)
if err != nil {
return nil, err
}
pemKey := pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: priv})
val, err := json.Marshal(ecdsaPrivateKeyValue{
Private: string(pemKey),
Public: &data.PKIXPublicKey{PublicKey: s.Public()},
})
if err != nil {
return nil, err
}
return &data.PrivateKey{
Type: data.KeyTypeECDSA_SHA2_P256,
Scheme: data.KeySchemeECDSA_SHA2_P256,
Algorithms: data.HashAlgorithms,
Value: val,
}, nil
}
func (s *ecdsaSigner) UnmarshalPrivateKey(key *data.PrivateKey) error {
val := ecdsaPrivateKeyValue{}
if err := json.Unmarshal(key.Value, &val); err != nil {
return err
}
block, _ := pem.Decode([]byte(val.Private))
if block == nil {
return errors.New("invalid PEM value")
}
if block.Type != "EC PRIVATE KEY" {
return fmt.Errorf("invalid block type: %s", block.Type)
}
k, err := x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return err
}
if k.Curve != elliptic.P256() {
return errors.New("invalid ecdsa curve")
}
s.PrivateKey = k
return nil
}
func GenerateEcdsaKey() (*ecdsaSigner, error) {
privkey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, err
}
return &ecdsaSigner{privkey}, nil
}