mirror of https://github.com/cheat/cheat.git
92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
// Package eddsa implements EdDSA signature, suitable for OpenPGP, as specified in
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// https://datatracker.ietf.org/doc/html/draft-ietf-openpgp-crypto-refresh-06#section-13.7
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package eddsa
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import (
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"errors"
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"github.com/ProtonMail/go-crypto/openpgp/internal/ecc"
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"io"
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)
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type PublicKey struct {
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X []byte
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curve ecc.EdDSACurve
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}
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type PrivateKey struct {
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PublicKey
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D []byte
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}
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func NewPublicKey(curve ecc.EdDSACurve) *PublicKey {
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return &PublicKey{
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curve: curve,
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}
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}
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func NewPrivateKey(key PublicKey) *PrivateKey {
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return &PrivateKey{
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PublicKey: key,
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}
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}
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func (pk *PublicKey) GetCurve() ecc.EdDSACurve {
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return pk.curve
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}
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func (pk *PublicKey) MarshalPoint() []byte {
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return pk.curve.MarshalBytePoint(pk.X)
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}
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func (pk *PublicKey) UnmarshalPoint(x []byte) error {
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pk.X = pk.curve.UnmarshalBytePoint(x)
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if pk.X == nil {
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return errors.New("eddsa: failed to parse EC point")
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}
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return nil
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}
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func (sk *PrivateKey) MarshalByteSecret() []byte {
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return sk.curve.MarshalByteSecret(sk.D)
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}
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func (sk *PrivateKey) UnmarshalByteSecret(d []byte) error {
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sk.D = sk.curve.UnmarshalByteSecret(d)
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if sk.D == nil {
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return errors.New("eddsa: failed to parse scalar")
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}
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return nil
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}
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func GenerateKey(rand io.Reader, c ecc.EdDSACurve) (priv *PrivateKey, err error) {
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priv = new(PrivateKey)
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priv.PublicKey.curve = c
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priv.PublicKey.X, priv.D, err = c.GenerateEdDSA(rand)
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return
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}
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func Sign(priv *PrivateKey, message []byte) (r, s []byte, err error) {
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sig, err := priv.PublicKey.curve.Sign(priv.PublicKey.X, priv.D, message)
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if err != nil {
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return nil, nil, err
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}
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r, s = priv.PublicKey.curve.MarshalSignature(sig)
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return
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}
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func Verify(pub *PublicKey, message, r, s []byte) bool {
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sig := pub.curve.UnmarshalSignature(r, s)
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if sig == nil {
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return false
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}
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return pub.curve.Verify(pub.X, message, sig)
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}
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func Validate(priv *PrivateKey) error {
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return priv.curve.ValidateEdDSA(priv.PublicKey.X, priv.D)
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}
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