a903147b60
Signature itself wasn't used at all and its name is very misleading, Uint160 script hash is way more useful.
145 lines
3.7 KiB
Go
145 lines
3.7 KiB
Go
package keys
|
|
|
|
import (
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/sha256"
|
|
"crypto/x509"
|
|
"encoding/hex"
|
|
"fmt"
|
|
"math/big"
|
|
|
|
"github.com/CityOfZion/neo-go/pkg/util"
|
|
"github.com/nspcc-dev/rfc6979"
|
|
)
|
|
|
|
// PrivateKey represents a NEO private key.
|
|
type PrivateKey struct {
|
|
b []byte
|
|
}
|
|
|
|
// NewPrivateKey creates a new random private key.
|
|
func NewPrivateKey() (*PrivateKey, error) {
|
|
priv, _, _, err := elliptic.GenerateKey(elliptic.P256(), rand.Reader)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &PrivateKey{b: priv}, nil
|
|
}
|
|
|
|
// NewPrivateKeyFromHex returns a PrivateKey created from the
|
|
// given hex string.
|
|
func NewPrivateKeyFromHex(str string) (*PrivateKey, error) {
|
|
b, err := hex.DecodeString(str)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return NewPrivateKeyFromBytes(b)
|
|
}
|
|
|
|
// NewPrivateKeyFromBytes returns a NEO PrivateKey from the given byte slice.
|
|
func NewPrivateKeyFromBytes(b []byte) (*PrivateKey, error) {
|
|
if len(b) != 32 {
|
|
return nil, fmt.Errorf(
|
|
"invalid byte length: expected %d bytes got %d", 32, len(b),
|
|
)
|
|
}
|
|
return &PrivateKey{b}, nil
|
|
}
|
|
|
|
// NewPrivateKeyFromASN1 returns a NEO PrivateKey from the ASN.1 serialized key.
|
|
func NewPrivateKeyFromASN1(b []byte) (*PrivateKey, error) {
|
|
privkey, err := x509.ParseECPrivateKey(b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return NewPrivateKeyFromBytes(privkey.D.Bytes())
|
|
}
|
|
|
|
// PublicKey derives the public key from the private key.
|
|
func (p *PrivateKey) PublicKey() *PublicKey {
|
|
var (
|
|
c = elliptic.P256()
|
|
q = new(big.Int).SetBytes(p.b)
|
|
)
|
|
|
|
x, y := c.ScalarBaseMult(q.Bytes())
|
|
|
|
return &PublicKey{X: x, Y: y}
|
|
}
|
|
|
|
// NewPrivateKeyFromWIF returns a NEO PrivateKey from the given
|
|
// WIF (wallet import format).
|
|
func NewPrivateKeyFromWIF(wif string) (*PrivateKey, error) {
|
|
w, err := WIFDecode(wif, WIFVersion)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return w.PrivateKey, nil
|
|
}
|
|
|
|
// WIF returns the (wallet import format) of the PrivateKey.
|
|
// Good documentation about this process can be found here:
|
|
// https://en.bitcoin.it/wiki/Wallet_import_format
|
|
func (p *PrivateKey) WIF() string {
|
|
w, err := WIFEncode(p.b, WIFVersion, true)
|
|
// The only way WIFEncode() can fail is if we're to give it a key of
|
|
// wrong size, but we have a proper key here, aren't we?
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return w
|
|
}
|
|
|
|
// Address derives the public NEO address that is coupled with the private key, and
|
|
// returns it as a string.
|
|
func (p *PrivateKey) Address() string {
|
|
pk := p.PublicKey()
|
|
return pk.Address()
|
|
}
|
|
|
|
// GetScriptHash returns verification script hash for public key associated with
|
|
// the private key.
|
|
func (p *PrivateKey) GetScriptHash() util.Uint160 {
|
|
pk := p.PublicKey()
|
|
return pk.GetScriptHash()
|
|
}
|
|
|
|
// Sign signs arbitrary length data using the private key.
|
|
func (p *PrivateKey) Sign(data []byte) []byte {
|
|
var (
|
|
privateKey = p.ecdsa()
|
|
digest = sha256.Sum256(data)
|
|
)
|
|
|
|
r, s := rfc6979.SignECDSA(privateKey, digest[:], sha256.New)
|
|
|
|
params := privateKey.Curve.Params()
|
|
curveOrderByteSize := params.P.BitLen() / 8
|
|
rBytes, sBytes := r.Bytes(), s.Bytes()
|
|
signature := make([]byte, curveOrderByteSize*2)
|
|
copy(signature[curveOrderByteSize-len(rBytes):], rBytes)
|
|
copy(signature[curveOrderByteSize*2-len(sBytes):], sBytes)
|
|
|
|
return signature
|
|
}
|
|
|
|
// ecsda converts the key to a usable ecsda.PrivateKey for signing data.
|
|
func (p *PrivateKey) ecdsa() *ecdsa.PrivateKey {
|
|
priv := new(ecdsa.PrivateKey)
|
|
priv.PublicKey.Curve = elliptic.P256()
|
|
priv.D = new(big.Int).SetBytes(p.b)
|
|
priv.PublicKey.X, priv.PublicKey.Y = priv.PublicKey.Curve.ScalarBaseMult(p.b)
|
|
return priv
|
|
}
|
|
|
|
// String implements the stringer interface.
|
|
func (p *PrivateKey) String() string {
|
|
return hex.EncodeToString(p.b)
|
|
}
|
|
|
|
// Bytes returns the underlying bytes of the PrivateKey.
|
|
func (p *PrivateKey) Bytes() []byte {
|
|
return p.b
|
|
}
|