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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus-core library is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
// Authenticator verify data owner.
type Authenticator struct {
prvKey crypto.PrivateKey
pubKey crypto.PublicKey
proposerID types.NodeID
}
// NewAuthenticator constructs an Authenticator instance.
func NewAuthenticator(prvKey crypto.PrivateKey) (auth *Authenticator) {
auth = &Authenticator{
prvKey: prvKey,
pubKey: prvKey.PublicKey(),
}
auth.proposerID = types.NewNodeID(auth.pubKey)
return
}
// SignBlock signs a types.Block.
func (au *Authenticator) SignBlock(b *types.Block) (err error) {
b.ProposerID = au.proposerID
if b.Hash, err = hashBlock(b); err != nil {
return
}
if b.Signature, err = au.prvKey.Sign(b.Hash); err != nil {
return
}
return
}
// SignVote signs a types.Vote.
func (au *Authenticator) SignVote(v *types.Vote) (err error) {
v.ProposerID = au.proposerID
v.Signature, err = au.prvKey.Sign(hashVote(v))
return
}
// SignCRS signs CRS signature of types.Block.
func (au *Authenticator) SignCRS(b *types.Block, crs common.Hash) (err error) {
if b.ProposerID != au.proposerID {
err = ErrInvalidProposerID
return
}
b.CRSSignature, err = au.prvKey.Sign(hashCRS(b, crs))
return
}
// SignDKGComplaint signs a DKG complaint.
func (au *Authenticator) SignDKGComplaint(
complaint *types.DKGComplaint) (err error) {
complaint.ProposerID = au.proposerID
complaint.Signature, err = au.prvKey.Sign(hashDKGComplaint(complaint))
return
}
// SignDKGMasterPublicKey signs a DKG master public key.
func (au *Authenticator) SignDKGMasterPublicKey(
mpk *types.DKGMasterPublicKey) (err error) {
mpk.ProposerID = au.proposerID
mpk.Signature, err = au.prvKey.Sign(hashDKGMasterPublicKey(mpk))
return
}
// SignDKGPrivateShare signs a DKG private share.
func (au *Authenticator) SignDKGPrivateShare(
prvShare *types.DKGPrivateShare) (err error) {
prvShare.ProposerID = au.proposerID
prvShare.Signature, err = au.prvKey.Sign(hashDKGPrivateShare(prvShare))
return
}
// SignDKGPartialSignature signs a DKG partial signature.
func (au *Authenticator) SignDKGPartialSignature(
pSig *types.DKGPartialSignature) (err error) {
pSig.ProposerID = au.proposerID
pSig.Signature, err = au.prvKey.Sign(hashDKGPartialSignature(pSig))
return
}
// SignDKGFinalize signs a DKG finalize message.
func (au *Authenticator) SignDKGFinalize(
final *types.DKGFinalize) (err error) {
final.ProposerID = au.proposerID
final.Signature, err = au.prvKey.Sign(hashDKGFinalize(final))
return
}
// VerifyBlock verifies the signature of types.Block.
func (au *Authenticator) VerifyBlock(b *types.Block) (err error) {
hash, err := hashBlock(b)
if err != nil {
return
}
if hash != b.Hash {
err = ErrIncorrectHash
return
}
pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
if err != nil {
return
}
if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
err = ErrIncorrectSignature
return
}
return
}
// VerifyVote verifies the signature of types.Vote.
func (au *Authenticator) VerifyVote(v *types.Vote) (bool, error) {
return verifyVoteSignature(v)
}
// VerifyCRS verifies the CRS signature of types.Block.
func (au *Authenticator) VerifyCRS(b *types.Block, crs common.Hash) (bool, error) {
return verifyCRSSignature(b, crs)
}
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