164 lines
3.8 KiB
Go
Executable file
164 lines
3.8 KiB
Go
Executable file
package publickey
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"io"
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"math/big"
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"github.com/CityOfZion/neo-go/pkg/crypto/base58"
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"github.com/CityOfZion/neo-go/pkg/crypto/elliptic"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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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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// PublicKey represents a public key and provides a high level
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// API around the ECPoint.
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type PublicKey struct {
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Curve elliptic.Curve
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elliptic.Point
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}
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// NewPublicKeyFromString return 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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curve := elliptic.NewEllipticCurve(elliptic.Secp256r1)
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pubKey := &PublicKey{curve, elliptic.Point{}}
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if err := pubKey.DecodeBinary(bytes.NewReader(b)); err != nil {
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return nil, 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.Curve.IsInfinity(p.Point) {
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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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// ToAddress will convert a public key to it's neo-address
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func (p *PublicKey) ToAddress() string {
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publicKeyBytes := p.Bytes()
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publicKeyBytes = append([]byte{0x21}, publicKeyBytes...) // 0x21 = length of pubKey
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publicKeyBytes = append(publicKeyBytes, 0xAC) // 0xAC = CheckSig
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hash160PubKey, _ := hash.Hash160(publicKeyBytes)
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versionHash160PubKey := append([]byte{0x17}, hash160PubKey.Bytes()...)
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checksum, _ := hash.Checksum(versionHash160PubKey)
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checkVersionHash160 := append(versionHash160PubKey, checksum...)
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address := base58.Encode(checkVersionHash160)
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return address
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}
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// DecodeBinary decodes a PublicKey from the given io.Reader.
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func (p *PublicKey) DecodeBinary(r io.Reader) error {
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var prefix uint8
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if err := binary.Read(r, binary.LittleEndian, &prefix); err != nil {
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return err
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}
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// Infinity
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if prefix == 0x00 {
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p.Point = elliptic.Point{}
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return nil
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}
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// Compressed public keys.
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if prefix == 0x02 || prefix == 0x03 {
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b := make([]byte, 32)
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if err := binary.Read(r, binary.LittleEndian, b); err != nil {
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return err
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}
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var err error
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p.Point, err = p.Curve.Decompress(new(big.Int).SetBytes(b), uint(prefix&0x1))
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if err != nil {
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return err
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}
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} else if prefix == 0x04 {
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buf := make([]byte, 65)
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if err := binary.Read(r, binary.LittleEndian, buf); err != nil {
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return err
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}
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p.X = new(big.Int).SetBytes(buf[1:33])
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p.Y = new(big.Int).SetBytes(buf[33:65])
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} else {
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return fmt.Errorf("invalid prefix %d", prefix)
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}
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return nil
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}
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// EncodeBinary encodes a PublicKey to the given io.Writer.
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func (p *PublicKey) EncodeBinary(w io.Writer) error {
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return binary.Write(w, binary.LittleEndian, p.Bytes())
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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 = p.Curve
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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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