/
publickey.go
103 lines (79 loc) · 2.09 KB
/
publickey.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
package key
import (
"bytes"
"errors"
"fmt"
"strings"
"github.com/scorum/scorum-go/encoding/transaction"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcutil/base58"
"golang.org/x/crypto/ripemd160"
)
const (
publicKeyPrefix = "SCR"
checkSumLen = 4
keyLen = 53
)
var (
ErrWrongPrefix = errors.New("wrong prefix")
ErrWrongChecksum = errors.New("wrong check sum")
ErrWrongKeyLen = errors.New("wrong key len")
ErrKeyMismatch = errors.New("key mismatch")
)
type PublicKey struct {
raw *btcec.PublicKey
}
func NewPublicKey(pubKey string) (*PublicKey, error) {
if len(pubKey) != keyLen {
return nil, ErrWrongKeyLen
}
if !strings.HasPrefix(pubKey, publicKeyPrefix) {
return nil, ErrWrongPrefix
}
keyWithChecksum := base58.Decode(pubKey[len(publicKeyPrefix):])
key := keyWithChecksum[:len(keyWithChecksum)-checkSumLen]
h := ripemd160.New()
h.Write(key)
hash := h.Sum(nil)
if !bytes.Equal(hash[:checkSumLen], keyWithChecksum[len(keyWithChecksum)-checkSumLen:]) {
return nil, ErrWrongChecksum
}
return PublicKeyFromBytes(key)
}
func PublicKeyFromBytes(key []byte) (*PublicKey, error) {
p, err := btcec.ParsePubKey(key, btcec.S256())
if err != nil {
return nil, err
}
return &PublicKey{raw: p}, nil
}
func (p *PublicKey) String() string {
h := ripemd160.New()
h.Write(p.raw.SerializeCompressed())
hash := h.Sum(nil)
b := bytes.Buffer{}
b.Write(p.raw.SerializeCompressed())
b.Write(hash[:checkSumLen])
return publicKeyPrefix + base58.Encode(b.Bytes())
}
func (p *PublicKey) Serialize() []byte {
return p.raw.SerializeCompressed()
}
func (p *PublicKey) Verify(digest []byte, signature []byte) error {
pub, _, err := btcec.RecoverCompact(btcec.S256(), signature, digest)
if err != nil {
return fmt.Errorf("recover compact: %w", err)
}
if !p.raw.IsEqual(pub) {
return ErrKeyMismatch
}
return nil
}
func (p *PublicKey) MarshalTransaction(encoder *transaction.Encoder) error {
if p.raw == nil {
return errors.New("public key is nil")
}
enc := transaction.NewRollingEncoder(encoder)
enc.Encode(p.raw.SerializeCompressed())
return enc.Err()
}