/
publickey.go
199 lines (161 loc) · 4.03 KB
/
publickey.go
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package types
import (
"bytes"
"crypto/ecdsa"
"fmt"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcutil/base58"
"github.com/denkhaus/bitshares/config"
"github.com/denkhaus/bitshares/util"
sort "github.com/emirpasic/gods/utils"
"github.com/juju/errors"
"github.com/pquerna/ffjson/ffjson"
)
var (
nullKeyBytes = bytes.Repeat([]byte{0x0}, 33)
)
type PublicKeys []PublicKey
func (p PublicKeys) Marshal(enc *util.TypeEncoder) error {
if err := enc.EncodeUVarint(uint64(len(p))); err != nil {
return errors.Annotate(err, "encode length")
}
for _, pub := range p {
if err := enc.Encode(pub); err != nil {
return errors.Annotate(err, "encode PublicKey")
}
}
return nil
}
type PublicKey struct {
key *btcec.PublicKey
addr *Address
prefix string
checksum []byte
}
func (p PublicKey) String() string {
b := append(p.Bytes(), p.checksum...)
return fmt.Sprintf("%s%s", p.prefix, base58.Encode(b))
}
func (p *PublicKey) UnmarshalJSON(data []byte) error {
var key string
if err := ffjson.Unmarshal(data, &key); err != nil {
return errors.Annotate(err, "Unmarshal")
}
pub, err := NewPublicKeyFromString(key)
if err != nil {
return errors.Annotate(err, "NewPublicKeyFromString")
}
p.addr = nil
p.key = pub.key
p.prefix = pub.prefix
p.checksum = pub.checksum
return nil
}
func (p PublicKey) MarshalJSON() ([]byte, error) {
return ffjson.Marshal(p.String())
}
func (p PublicKey) Marshal(enc *util.TypeEncoder) error {
return enc.Encode(p.Bytes())
}
func (p *PublicKey) ToAddress() (a *Address, err error) {
if p.addr == nil {
p.addr, err = NewAddress(p)
}
return p.addr, err
}
func (p PublicKey) Bytes() []byte {
if p.key != nil {
return p.key.SerializeCompressed()
}
return nullKeyBytes
}
func (p PublicKey) Equal(pub *PublicKey) bool {
if p.key != nil && pub.key != nil {
return p.key.IsEqual(pub.key)
}
return p.key == nil && pub.key == nil
}
func (p PublicKey) ToECDSA() *ecdsa.PublicKey {
if p.key != nil {
return p.key.ToECDSA()
}
return nil
}
// MaxSharedKeyLength returns the maximum length of the shared key the
// public key can produce.
func (p PublicKey) MaxSharedKeyLength() int {
if p.key != nil {
return (p.key.ToECDSA().Curve.Params().BitSize + 7) / 8
}
return 0
}
// NewPublicKeyFromString creates a new PublicKey from string
// e.g.("BTS6K35Bajw29N4fjP4XADHtJ7bEj2xHJ8CoY2P2s1igXTB5oMBhR")
func NewPublicKeyFromString(key string) (*PublicKey, error) {
cnf := config.Current()
if cnf == nil {
return nil, ErrChainConfigIsUndefined
}
prefixChain := cnf.Prefix
prefix := key[:len(prefixChain)]
if prefix != prefixChain {
return nil, ErrPublicKeyChainPrefixMismatch
}
b58 := base58.Decode(key[len(prefixChain):])
if len(b58) < 5 {
return nil, ErrInvalidPublicKey
}
chk1 := b58[len(b58)-4:]
keyBytes := b58[:len(b58)-4]
chk2, err := util.Ripemd160Checksum(keyBytes)
if err != nil {
return nil, errors.Annotate(err, "Ripemd160Checksum")
}
if !bytes.Equal(chk1, chk2) {
return nil, ErrInvalidPublicKey
}
var pubKey *btcec.PublicKey
if !bytes.Equal(keyBytes, nullKeyBytes) {
p, err := btcec.ParsePubKey(keyBytes, btcec.S256())
if err != nil {
return nil, errors.Annotate(err, "ParsePubKey")
}
pubKey = p
}
k := PublicKey{
key: pubKey,
addr: nil,
prefix: prefix,
checksum: chk1,
}
return &k, nil
}
func NewPublicKey(pub *btcec.PublicKey) (*PublicKey, error) {
buf := pub.SerializeCompressed()
cnf := config.Current()
if cnf == nil {
return nil, ErrChainConfigIsUndefined
}
chk, err := util.Ripemd160Checksum(buf)
if err != nil {
return nil, errors.Annotate(err, "Ripemd160Checksum")
}
k := PublicKey{
key: pub,
prefix: cnf.Prefix,
addr: nil,
checksum: chk,
}
return &k, nil
}
func publicKeyComparator(key1, key2 *PublicKey) (int, error) {
addr1, err := key1.ToAddress()
if err != nil {
return 0, errors.Annotate(err, "ToAddress 1")
}
addr2, err := key2.ToAddress()
if err != nil {
return 0, errors.Annotate(err, "ToAddress 2")
}
return sort.StringComparator(addr1.String(), addr2.String()), nil
}