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package crypto
import (
"github.com/tendermint/ed25519"
"github.com/tendermint/ed25519/extra25519"
. "github.com/tendermint/go-common"
"github.com/tendermint/go-wire"
)
// PrivKey is part of PrivAccount and state.PrivValidator.
type PrivKey interface {
Bytes() []byte
Sign(msg []byte) Signature
PubKey() PubKey
}
// Types of PrivKey implementations
const (
PrivKeyTypeEd25519 = byte(0x01)
)
// for wire.readReflect
var _ = wire.RegisterInterface(
struct{ PrivKey }{},
wire.ConcreteType{PrivKeyEd25519{}, PrivKeyTypeEd25519},
)
func PrivKeyFromBytes(privKeyBytes []byte) (privKey PrivKey, err error) {
err = wire.ReadBinaryBytes(privKeyBytes, &privKey)
return
}
//-------------------------------------
// Implements PrivKey
type PrivKeyEd25519 [64]byte
func (privKey PrivKeyEd25519) Bytes() []byte {
return wire.BinaryBytes(struct{ PrivKey }{privKey})
}
func (key PrivKeyEd25519) Sign(msg []byte) Signature {
privKeyBytes := [64]byte(key)
signatureBytes := ed25519.Sign(&privKeyBytes, msg)
return SignatureEd25519(*signatureBytes)
}
func (privKey PrivKeyEd25519) PubKey() PubKey {
privKeyBytes := [64]byte(privKey)
return PubKeyEd25519(*ed25519.MakePublicKey(&privKeyBytes))
}
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 (key PrivKeyEd25519) Generate(index int) PrivKeyEd25519 {
newBytes := wire.BinarySha256(struct {
PrivKey [64]byte
Index int
}{key, index})
var newKey [64]byte
copy(newKey[:], newBytes)
return PrivKeyEd25519(newKey)
}
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)
}