-
Notifications
You must be signed in to change notification settings - Fork 0
/
pubkey.go
46 lines (39 loc) · 1.2 KB
/
pubkey.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
// Copyright (c) 2013-2014 The btcsuite developers
// Copyright (c) 2015-2019 The Utopia developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package schnorr
import (
"fmt"
"github.com/UtopiaCoinOrg/ucd/ucec/secp256k1"
)
// These constants define the lengths of serialized public keys.
const (
PubKeyBytesLen = 33
)
const (
// pubkeyCompressed is the header byte for a compressed secp256k1 pubkey.
pubkeyCompressed byte = 0x2 // y_bit + x coord
)
// ParsePubKey parses a public key for a koblitz curve from a bytestring into a
// ecdsa.Publickey, verifying that it is valid. It supports compressed signature
// formats only.
func ParsePubKey(curve *secp256k1.KoblitzCurve,
pubKeyStr []byte) (key *secp256k1.PublicKey, err error) {
if pubKeyStr == nil {
err = fmt.Errorf("nil pubkey byte string")
return
}
if len(pubKeyStr) != PubKeyBytesLen {
err = fmt.Errorf("bad pubkey byte string size (want %v, have %v)",
PubKeyBytesLen, len(pubKeyStr))
return
}
format := pubKeyStr[0]
format &= ^byte(0x1)
if format != pubkeyCompressed {
err = fmt.Errorf("wrong pubkey type (not compressed)")
return
}
return secp256k1.ParsePubKey(pubKeyStr)
}