mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-30 09:33:36 +00:00
143 lines
3.6 KiB
Go
143 lines
3.6 KiB
Go
package keys
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import (
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/sha256"
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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/nspcc-dev/rfc6979"
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)
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// PrivateKey represents a NEO private key.
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type PrivateKey struct {
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b []byte
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}
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// NewPrivateKey creates a new random private key.
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func NewPrivateKey() (*PrivateKey, error) {
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priv, _, _, err := elliptic.GenerateKey(elliptic.P256(), rand.Reader)
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if err != nil {
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return nil, err
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}
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return &PrivateKey{b: priv}, nil
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}
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// NewPrivateKeyFromHex returns a PrivateKey created from the
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// given hex string.
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func NewPrivateKeyFromHex(str string) (*PrivateKey, error) {
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b, err := hex.DecodeString(str)
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if err != nil {
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return nil, err
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}
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return NewPrivateKeyFromBytes(b)
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}
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// NewPrivateKeyFromBytes returns a NEO PrivateKey from the given byte slice.
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func NewPrivateKeyFromBytes(b []byte) (*PrivateKey, error) {
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if len(b) != 32 {
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return nil, fmt.Errorf(
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"invalid byte length: expected %d bytes got %d", 32, len(b),
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)
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}
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return &PrivateKey{b}, nil
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}
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// NewPrivateKeyFromASN1 returns a NEO PrivateKey from the ASN.1 serialized key.
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func NewPrivateKeyFromASN1(b []byte) (*PrivateKey, error) {
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privkey, err := x509.ParseECPrivateKey(b)
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if err != nil {
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return nil, err
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}
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return NewPrivateKeyFromBytes(privkey.D.Bytes())
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}
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// PublicKey derives the public key from the private key.
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func (p *PrivateKey) PublicKey() *PublicKey {
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var (
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c = elliptic.P256()
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q = new(big.Int).SetBytes(p.b)
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)
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x, y := c.ScalarBaseMult(q.Bytes())
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return &PublicKey{X: x, Y: y}
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}
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// NewPrivateKeyFromWIF returns a NEO PrivateKey from the given
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// WIF (wallet import format).
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func NewPrivateKeyFromWIF(wif string) (*PrivateKey, error) {
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w, err := WIFDecode(wif, WIFVersion)
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if err != nil {
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return nil, err
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}
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return w.PrivateKey, nil
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}
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// WIF returns the (wallet import format) of the PrivateKey.
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// Good documentation about this process can be found here:
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// https://en.bitcoin.it/wiki/Wallet_import_format
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func (p *PrivateKey) WIF() string {
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w, err := WIFEncode(p.b, WIFVersion, true)
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// The only way WIFEncode() can fail is if we're to give it a key of
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// wrong size, but we have a proper key here, aren't we?
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if err != nil {
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panic(err)
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}
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return w
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}
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// Address derives the public NEO address that is coupled with the private key, and
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// returns it as a string.
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func (p *PrivateKey) Address() string {
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pk := p.PublicKey()
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return pk.Address()
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}
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// Signature creates the signature using the private key.
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func (p *PrivateKey) Signature() []byte {
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pk := p.PublicKey()
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return pk.Signature()
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}
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// Sign signs arbitrary length data using the private key.
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func (p *PrivateKey) Sign(data []byte) []byte {
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var (
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privateKey = p.ecdsa()
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digest = sha256.Sum256(data)
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)
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r, s := rfc6979.SignECDSA(privateKey, digest[:], sha256.New)
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params := privateKey.Curve.Params()
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curveOrderByteSize := params.P.BitLen() / 8
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rBytes, sBytes := r.Bytes(), s.Bytes()
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signature := make([]byte, curveOrderByteSize*2)
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copy(signature[curveOrderByteSize-len(rBytes):], rBytes)
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copy(signature[curveOrderByteSize*2-len(sBytes):], sBytes)
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return signature
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}
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// ecsda converts the key to a usable ecsda.PrivateKey for signing data.
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func (p *PrivateKey) ecdsa() *ecdsa.PrivateKey {
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priv := new(ecdsa.PrivateKey)
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priv.PublicKey.Curve = elliptic.P256()
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priv.D = new(big.Int).SetBytes(p.b)
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priv.PublicKey.X, priv.PublicKey.Y = priv.PublicKey.Curve.ScalarBaseMult(p.b)
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return priv
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}
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// String implements the stringer interface.
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func (p *PrivateKey) String() string {
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return hex.EncodeToString(p.b)
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}
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// Bytes returns the underlying bytes of the PrivateKey.
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func (p *PrivateKey) Bytes() []byte {
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return p.b
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}
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