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package crypto
import (
"bytes"
secp256k1 "github.com/btcsuite/btcd/btcec"
"github.com/tendermint/ed25519"
"github.com/tendermint/ed25519/extra25519"
. "github.com/tendermint/go-common"
data "github.com/tendermint/go-data"
"github.com/tendermint/go-wire"
)
func PrivKeyFromBytes(privKeyBytes []byte) (privKey PrivKey, err error) {
err = wire.ReadBinaryBytes(privKeyBytes, &privKey)
return
}
//----------------------------------------
type PrivKey struct {
PrivKeyInner `json:"unwrap"`
}
// DO NOT USE THIS INTERFACE.
// You probably want to use PubKey
type PrivKeyInner interface {
AssertIsPrivKeyInner()
Bytes() []byte
Sign(msg []byte) Signature
PubKey() PubKey
Equals(PrivKey) bool
Wrap() PrivKey
}
func (p PrivKey) MarshalJSON() ([]byte, error) {
return privKeyMapper.ToJSON(p.PrivKeyInner)
}
func (p *PrivKey) UnmarshalJSON(data []byte) (err error) {
parsed, err := privKeyMapper.FromJSON(data)
if err == nil && parsed != nil {
p.PrivKeyInner = parsed.(PrivKeyInner)
}
return
}
// Unwrap recovers the concrete interface safely (regardless of levels of embeds)
func (p PrivKey) Unwrap() PrivKeyInner {
pk := p.PrivKeyInner
for wrap, ok := pk.(PrivKey); ok; wrap, ok = pk.(PrivKey) {
pk = wrap.PrivKeyInner
}
return pk
}
func (p PrivKey) Empty() bool {
return p.PrivKeyInner == nil
}
var privKeyMapper = data.NewMapper(PrivKey{}).
RegisterImplementation(PrivKeyEd25519{}, NameEd25519, TypeEd25519).
RegisterImplementation(PrivKeySecp256k1{}, NameSecp256k1, TypeSecp256k1)
//-------------------------------------
// Implements PrivKey
type PrivKeyEd25519 [64]byte
func (privKey PrivKeyEd25519) AssertIsPrivKeyInner() {}
func (privKey PrivKeyEd25519) Bytes() []byte {
return wire.BinaryBytes(PrivKey{privKey})
}
func (privKey PrivKeyEd25519) Sign(msg []byte) Signature {
privKeyBytes := [64]byte(privKey)
signatureBytes := ed25519.Sign(&privKeyBytes, msg)
return SignatureEd25519(*signatureBytes).Wrap()
}
func (privKey PrivKeyEd25519) PubKey() PubKey {
privKeyBytes := [64]byte(privKey)
pubBytes := *ed25519.MakePublicKey(&privKeyBytes)
return PubKeyEd25519(pubBytes).Wrap()
}
func (privKey PrivKeyEd25519) Equals(other PrivKey) bool {
if otherEd, ok := other.Unwrap().(PrivKeyEd25519); ok {
return bytes.Equal(privKey[:], otherEd[:])
} else {
return false
}
}
func (p PrivKeyEd25519) MarshalJSON() ([]byte, error) {
return data.Encoder.Marshal(p[:])
}
func (p *PrivKeyEd25519) UnmarshalJSON(enc []byte) error {
var ref []byte
err := data.Encoder.Unmarshal(&ref, enc)
copy(p[:], ref)
return err
}
func (privKey PrivKeyEd25519) ToCurve25519() *[32]byte {
keyCurve25519 := new([32]byte)
privKeyBytes := [64]byte(privKey)
extra25519.PrivateKeyToCurve25519(keyCurve25519, &privKeyBytes)
return keyCurve25519
}
func (privKey PrivKeyEd25519) String() string {
return Fmt("PrivKeyEd25519{*****}")
}
// Deterministically generates new priv-key bytes from key.
func (privKey PrivKeyEd25519) Generate(index int) PrivKeyEd25519 {
newBytes := wire.BinarySha256(struct {
PrivKey [64]byte
Index int
}{privKey, index})
var newKey [64]byte
copy(newKey[:], newBytes)
return PrivKeyEd25519(newKey)
}
func (privKey PrivKeyEd25519) Wrap() PrivKey {
return PrivKey{privKey}
}
func GenPrivKeyEd25519() PrivKeyEd25519 {
privKeyBytes := new([64]byte)
copy(privKeyBytes[:32], CRandBytes(32))
ed25519.MakePublicKey(privKeyBytes)
return PrivKeyEd25519(*privKeyBytes)
}
// NOTE: secret should be the output of a KDF like bcrypt,
// if it's derived from user input.
func GenPrivKeyEd25519FromSecret(secret []byte) PrivKeyEd25519 {
privKey32 := Sha256(secret) // Not Ripemd160 because we want 32 bytes.
privKeyBytes := new([64]byte)
copy(privKeyBytes[:32], privKey32)
ed25519.MakePublicKey(privKeyBytes)
return PrivKeyEd25519(*privKeyBytes)
}
//-------------------------------------
// Implements PrivKey
type PrivKeySecp256k1 [32]byte
func (privKey PrivKeySecp256k1) AssertIsPrivKeyInner() {}
func (privKey PrivKeySecp256k1) Bytes() []byte {
return wire.BinaryBytes(PrivKey{privKey})
}
func (privKey PrivKeySecp256k1) Sign(msg []byte) Signature {
priv__, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
sig__, err := priv__.Sign(Sha256(msg))
if err != nil {
PanicSanity(err)
}
return SignatureSecp256k1(sig__.Serialize()).Wrap()
}
func (privKey PrivKeySecp256k1) PubKey() PubKey {
_, pub__ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey[:])
var pub PubKeySecp256k1
copy(pub[:], pub__.SerializeCompressed())
return pub.Wrap()
}
func (privKey PrivKeySecp256k1) Equals(other PrivKey) bool {
if otherSecp, ok := other.Unwrap().(PrivKeySecp256k1); ok {
return bytes.Equal(privKey[:], otherSecp[:])
} else {
return false
}
}
func (p PrivKeySecp256k1) MarshalJSON() ([]byte, error) {
return data.Encoder.Marshal(p[:])
}
func (p *PrivKeySecp256k1) UnmarshalJSON(enc []byte) error {
var ref []byte
err := data.Encoder.Unmarshal(&ref, enc)
copy(p[:], ref)
return err
}
func (privKey PrivKeySecp256k1) String() string {
return Fmt("PrivKeySecp256k1{*****}")
}
func (privKey PrivKeySecp256k1) Wrap() PrivKey {
return PrivKey{privKey}
}
/*
// Deterministically generates new priv-key bytes from key.
func (key PrivKeySecp256k1) Generate(index int) PrivKeySecp256k1 {
newBytes := wire.BinarySha256(struct {
PrivKey [64]byte
Index int
}{key, index})
var newKey [64]byte
copy(newKey[:], newBytes)
return PrivKeySecp256k1(newKey)
}
*/
func GenPrivKeySecp256k1() PrivKeySecp256k1 {
privKeyBytes := [32]byte{}
copy(privKeyBytes[:], CRandBytes(32))
priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKeyBytes[:])
copy(privKeyBytes[:], priv.Serialize())
return PrivKeySecp256k1(privKeyBytes)
}
// NOTE: secret should be the output of a KDF like bcrypt,
// if it's derived from user input.
func GenPrivKeySecp256k1FromSecret(secret []byte) PrivKeySecp256k1 {
privKey32 := Sha256(secret) // Not Ripemd160 because we want 32 bytes.
priv, _ := secp256k1.PrivKeyFromBytes(secp256k1.S256(), privKey32)
privKeyBytes := [32]byte{}
copy(privKeyBytes[:], priv.Serialize())
return PrivKeySecp256k1(privKeyBytes)
}