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pubkey.go
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pubkey.go
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package ecc
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"github.com/UncleAndy/cyberway-go/btcsuite/btcd/btcec"
"github.com/UncleAndy/cyberway-go/btcsuite/btcutil/base58"
"golang.org/x/crypto/ripemd160"
)
const PublicKeyPrefix = "GLS"
const PublicKeyK1Prefix = "GLS_K1"
const PublicKeyR1Prefix = "GLS_R1"
const PublicKeyPrefixCompat = "GLS"
type innerPublicKey interface {
key(content []byte) (*btcec.PublicKey, error)
prefix() string
}
type PublicKey struct {
Curve CurveID
Content []byte
inner innerPublicKey
}
func NewPublicKeyFromData(data []byte) (out PublicKey, err error) {
if len(data) != 34 {
return out, fmt.Errorf("public key data must have a length of 33 ")
}
out = PublicKey{
Curve: CurveID(data[0]), // 1 byte
Content: data[1:], // 33 bytes
}
switch out.Curve {
case CurveK1:
out.inner = &innerK1PublicKey{}
case CurveR1:
out.inner = &innerR1PublicKey{}
default:
return out, fmt.Errorf("unsupported curve prefix %q", out.Curve)
}
return out, nil
}
func MustNewPublicKeyFromData(data []byte) PublicKey {
key, err := NewPublicKeyFromData(data)
if err != nil {
panic(err.Error())
}
return key
}
func NewPublicKey(pubKey string) (out PublicKey, err error) {
if len(pubKey) < 8 {
return out, fmt.Errorf("invalid format")
}
var decodedPubKey []byte
var curveID CurveID
var inner innerPublicKey
if strings.HasPrefix(pubKey, PublicKeyR1Prefix) {
pubKeyMaterial := pubKey[len(PublicKeyR1Prefix):] // strip "PUB_R1_"
curveID = CurveR1
decodedPubKey, err = checkDecode(pubKeyMaterial, curveID)
if err != nil {
return out, fmt.Errorf("checkDecode: %s", err)
}
inner = &innerR1PublicKey{}
} else if strings.HasPrefix(pubKey, PublicKeyK1Prefix) {
pubKeyMaterial := pubKey[len(PublicKeyK1Prefix):] // strip "PUB_K1_"
curveID = CurveK1
decodedPubKey, err = checkDecode(pubKeyMaterial, curveID)
if err != nil {
return out, fmt.Errorf("checkDecode: %s", err)
}
inner = &innerK1PublicKey{}
} else if strings.HasPrefix(pubKey, PublicKeyPrefixCompat) { // "EOS"
pubKeyMaterial := pubKey[len(PublicKeyPrefixCompat):] // strip "EOS"
curveID = CurveK1
decodedPubKey, err = checkDecode(pubKeyMaterial, curveID)
if err != nil {
return out, fmt.Errorf("checkDecode: %s", err)
}
inner = &innerK1PublicKey{}
} else {
return out, fmt.Errorf("public key should start with [%q | %q] (or the old %q)", PublicKeyK1Prefix, PublicKeyR1Prefix, PublicKeyPrefixCompat)
}
return PublicKey{Curve: curveID, Content: decodedPubKey, inner: inner}, nil
}
func MustNewPublicKey(pubKey string) PublicKey {
key, err := NewPublicKey(pubKey)
if err != nil {
panic(err.Error())
}
return key
}
// CheckDecode decodes a string that was encoded with CheckEncode and verifies the checksum.
func checkDecode(input string, curve CurveID) (result []byte, err error) {
decoded := base58.Decode(input)
if len(decoded) < 5 {
return nil, fmt.Errorf("invalid format")
}
var cksum [4]byte
copy(cksum[:], decoded[len(decoded)-4:])
///// WARN: ok the ripemd160checksum should include the prefix in CERTAIN situations,
// like when we imported the PubKey without a prefix ?! tied to the string representation
// or something ? weird.. checksum shouldn't change based on the string reprsentation.
if bytes.Compare(ripemd160checksum(decoded[:len(decoded)-4], curve), cksum[:]) != 0 {
return nil, fmt.Errorf("invalid checksum")
}
// perhaps bitcoin has a leading net ID / version, but EOS doesn't
payload := decoded[:len(decoded)-4]
result = append(result, payload...)
return
}
func ripemd160checksum(in []byte, curve CurveID) []byte {
h := ripemd160.New()
_, _ = h.Write(in) // this implementation has no error path
if curve != CurveK1 {
_, _ = h.Write([]byte(curve.String()))
}
sum := h.Sum(nil)
return sum[:4]
}
func Ripemd160checksumHashCurve(in []byte, curve CurveID) []byte {
h := ripemd160.New()
_, _ = h.Write(in) // this implementation has no error path
// FIXME: this seems to be only rolled out to the `SIG_` things..
// proper support for importing `EOS` keys isn't rolled out into `dawn4`.
_, _ = h.Write([]byte(curve.String())) // conditionally ?
sum := h.Sum(nil)
return sum[:4]
}
func (p PublicKey) Key() (*btcec.PublicKey, error) {
return p.inner.key(p.Content)
}
func (p PublicKey) String() string {
data := p.Content
if len(data) == 0 {
data = make([]byte, 33)
}
hash := ripemd160checksum(data, p.Curve)
rawKey := make([]byte, 37)
copy(rawKey, data[:33])
copy(rawKey[33:], hash[:4])
return p.inner.prefix() + base58.Encode(rawKey)
}
func (p PublicKey) MarshalJSON() ([]byte, error) {
s := p.String()
return json.Marshal(s)
}
func (p *PublicKey) UnmarshalJSON(data []byte) error {
var s string
err := json.Unmarshal(data, &s)
if err != nil {
return err
}
newKey, err := NewPublicKey(s)
if err != nil {
return err
}
*p = newKey
return nil
}