mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-23 13:38:35 +00:00
281 lines
6.4 KiB
Go
281 lines
6.4 KiB
Go
package keys
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import (
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"bytes"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/x509"
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"encoding/hex"
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"fmt"
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"math/big"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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"github.com/CityOfZion/neo-go/pkg/encoding/base58"
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"github.com/CityOfZion/neo-go/pkg/io"
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"github.com/CityOfZion/neo-go/pkg/vm/opcode"
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"github.com/pkg/errors"
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)
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// PublicKeys is a list of public keys.
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type PublicKeys []*PublicKey
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func (keys PublicKeys) Len() int { return len(keys) }
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func (keys PublicKeys) Swap(i, j int) { keys[i], keys[j] = keys[j], keys[i] }
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func (keys PublicKeys) Less(i, j int) bool {
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if keys[i].X.Cmp(keys[j].X) == -1 {
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return true
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}
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if keys[i].X.Cmp(keys[j].X) == 1 {
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return false
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}
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if keys[i].X.Cmp(keys[j].X) == 0 {
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return false
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}
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return keys[i].Y.Cmp(keys[j].Y) == -1
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}
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// DecodeBytes decodes a PublicKeys from the given slice of bytes.
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func (keys PublicKeys) DecodeBytes(data []byte) error {
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b := io.NewBinReaderFromBuf(data)
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b.ReadArray(keys)
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return b.Err
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}
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// Contains checks whether passed param contained in PublicKeys.
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func (keys PublicKeys) Contains(pKey *PublicKey) bool {
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for _, key := range keys {
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if key.Equal(pKey) {
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return true
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}
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}
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return false
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}
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// Unique returns set of public keys.
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func (keys PublicKeys) Unique() PublicKeys {
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unique := PublicKeys{}
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for _, publicKey := range keys {
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if !unique.Contains(publicKey) {
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unique = append(unique, publicKey)
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}
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}
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return unique
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}
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// PublicKey represents a public key and provides a high level
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// API around the X/Y point.
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type PublicKey struct {
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X *big.Int
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Y *big.Int
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}
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// Equal returns true in case public keys are equal.
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func (p *PublicKey) Equal(key *PublicKey) bool {
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return p.X.Cmp(key.X) == 0 && p.Y.Cmp(key.Y) == 0
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}
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// NewPublicKeyFromString returns a public key created from the
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// given hex string.
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func NewPublicKeyFromString(s string) (*PublicKey, error) {
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b, err := hex.DecodeString(s)
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if err != nil {
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return nil, err
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}
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pubKey := new(PublicKey)
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r := io.NewBinReaderFromBuf(b)
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pubKey.DecodeBinary(r)
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if r.Err != nil {
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return nil, r.Err
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}
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return pubKey, nil
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}
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// Bytes returns the byte array representation of the public key.
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func (p *PublicKey) Bytes() []byte {
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if p.IsInfinity() {
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return []byte{0x00}
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}
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var (
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x = p.X.Bytes()
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paddedX = append(bytes.Repeat([]byte{0x00}, 32-len(x)), x...)
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prefix = byte(0x03)
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)
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if p.Y.Bit(0) == 0 {
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prefix = byte(0x02)
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}
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return append([]byte{prefix}, paddedX...)
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}
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// NewPublicKeyFromASN1 returns a NEO PublicKey from the ASN.1 serialized key.
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func NewPublicKeyFromASN1(data []byte) (*PublicKey, error) {
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var (
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err error
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pubkey interface{}
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)
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if pubkey, err = x509.ParsePKIXPublicKey(data); err != nil {
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return nil, err
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}
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pk, ok := pubkey.(*ecdsa.PublicKey)
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if !ok {
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return nil, errors.New("given bytes aren't ECDSA public key")
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}
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key := PublicKey{
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X: pk.X,
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Y: pk.Y,
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}
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return &key, nil
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}
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// decodeCompressedY performs decompression of Y coordinate for given X and Y's least significant bit.
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func decodeCompressedY(x *big.Int, ylsb uint) (*big.Int, error) {
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c := elliptic.P256()
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cp := c.Params()
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three := big.NewInt(3)
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/* y**2 = x**3 + a*x + b % p */
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xCubed := new(big.Int).Exp(x, three, cp.P)
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threeX := new(big.Int).Mul(x, three)
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threeX.Mod(threeX, cp.P)
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ySquared := new(big.Int).Sub(xCubed, threeX)
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ySquared.Add(ySquared, cp.B)
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ySquared.Mod(ySquared, cp.P)
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y := new(big.Int).ModSqrt(ySquared, cp.P)
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if y == nil {
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return nil, errors.New("error computing Y for compressed point")
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}
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if y.Bit(0) != ylsb {
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y.Neg(y)
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y.Mod(y, cp.P)
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}
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return y, nil
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}
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// DecodeBytes decodes a PublicKey from the given slice of bytes.
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func (p *PublicKey) DecodeBytes(data []byte) error {
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b := io.NewBinReaderFromBuf(data)
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p.DecodeBinary(b)
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return b.Err
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}
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// DecodeBinary decodes a PublicKey from the given BinReader.
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func (p *PublicKey) DecodeBinary(r *io.BinReader) {
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var prefix uint8
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var x, y *big.Int
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var err error
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prefix = uint8(r.ReadB())
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if r.Err != nil {
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return
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}
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// Infinity
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switch prefix {
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case 0x00:
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// noop, initialized to nil
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return
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case 0x02, 0x03:
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// Compressed public keys
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xbytes := make([]byte, 32)
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r.ReadBytes(xbytes)
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if r.Err != nil {
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return
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}
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x = new(big.Int).SetBytes(xbytes)
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ylsb := uint(prefix & 0x1)
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y, err = decodeCompressedY(x, ylsb)
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if err != nil {
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return
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}
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case 0x04:
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xbytes := make([]byte, 32)
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ybytes := make([]byte, 32)
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r.ReadBytes(xbytes)
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r.ReadBytes(ybytes)
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if r.Err != nil {
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return
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}
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x = new(big.Int).SetBytes(xbytes)
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y = new(big.Int).SetBytes(ybytes)
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default:
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r.Err = errors.Errorf("invalid prefix %d", prefix)
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return
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}
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c := elliptic.P256()
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cp := c.Params()
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if !c.IsOnCurve(x, y) {
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r.Err = errors.New("enccoded point is not on the P256 curve")
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return
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}
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if x.Cmp(cp.P) >= 0 || y.Cmp(cp.P) >= 0 {
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r.Err = errors.New("enccoded point is not correct (X or Y is bigger than P")
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return
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}
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p.X, p.Y = x, y
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}
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// EncodeBinary encodes a PublicKey to the given BinWriter.
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func (p *PublicKey) EncodeBinary(w *io.BinWriter) {
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w.WriteBytes(p.Bytes())
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}
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// GetVerificationScript returns NEO VM bytecode with CHECKSIG command for the
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// public key.
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func (p *PublicKey) GetVerificationScript() []byte {
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b := p.Bytes()
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b = append([]byte{byte(opcode.PUSHBYTES33)}, b...)
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b = append(b, byte(opcode.CHECKSIG))
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return b
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}
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// Signature returns a NEO-specific hash of the key.
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func (p *PublicKey) Signature() []byte {
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sig := hash.Hash160(p.GetVerificationScript())
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return sig.BytesBE()
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}
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// Address returns a base58-encoded NEO-specific address based on the key hash.
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func (p *PublicKey) Address() string {
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var b = p.Signature()
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b = append([]byte{0x17}, b...)
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return base58.CheckEncode(b)
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}
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// Verify returns true if the signature is valid and corresponds
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// to the hash and public key.
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func (p *PublicKey) Verify(signature []byte, hash []byte) bool {
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publicKey := &ecdsa.PublicKey{}
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publicKey.Curve = elliptic.P256()
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publicKey.X = p.X
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publicKey.Y = p.Y
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if p.X == nil || p.Y == nil {
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return false
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}
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rBytes := new(big.Int).SetBytes(signature[0:32])
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sBytes := new(big.Int).SetBytes(signature[32:64])
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return ecdsa.Verify(publicKey, hash, rBytes, sBytes)
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}
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// IsInfinity checks if the key is infinite (null, basically).
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func (p *PublicKey) IsInfinity() bool {
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return p.X == nil && p.Y == nil
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}
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// String implements the Stringer interface.
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func (p *PublicKey) String() string {
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if p.IsInfinity() {
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return "00"
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}
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bx := hex.EncodeToString(p.X.Bytes())
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by := hex.EncodeToString(p.Y.Bytes())
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return fmt.Sprintf("%s%s", bx, by)
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}
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