core: add key holder (#130)

The purpose to add this module is to export
the functionality to sign/verify data without
exporting private key directly.

1 files changed, 96 insertions, 0 deletions

diff --git a/core/key-holder_test.go b/core/key-holder_test.go
new file mode 100644
index 0000000..cb5fda7
--- /dev/null
+++ b/core/key-holder_test.go
@@ -0,0 +1,96 @@
+// 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 (
+	"testing"
+	"time"
+
+	"github.com/dexon-foundation/dexon-consensus-core/common"
+	"github.com/dexon-foundation/dexon-consensus-core/core/types"
+	"github.com/dexon-foundation/dexon-consensus-core/crypto/eth"
+	"github.com/stretchr/testify/suite"
+)
+
+type KeyHolderTestSuite struct {
+	suite.Suite
+}
+
+func (s *KeyHolderTestSuite) setupKeyHolder() *keyHolder {
+	k, err := eth.NewPrivateKey()
+	s.NoError(err)
+	return newKeyHolder(k, eth.SigToPub)
+}
+
+func (s *KeyHolderTestSuite) TestBlock() {
+	k := s.setupKeyHolder()
+	b := &types.Block{
+		ParentHash: common.NewRandomHash(),
+		Position: types.Position{
+			ShardID: 1,
+			ChainID: 2,
+			Height:  3,
+		},
+		Timestamp: time.Now().UTC(),
+	}
+	s.NoError(k.SignBlock(b))
+	s.NoError(k.VerifyBlock(b))
+}
+
+func (s *KeyHolderTestSuite) TestVote() {
+	k := s.setupKeyHolder()
+	v := &types.Vote{
+		ProposerID: types.NodeID{Hash: common.NewRandomHash()},
+		Type:       types.VoteConfirm,
+		BlockHash:  common.NewRandomHash(),
+		Period:     123,
+		Position: types.Position{
+			ShardID: 2,
+			ChainID: 4,
+			Height:  6,
+		}}
+	s.NoError(k.SignVote(v))
+	ok, err := k.VerifyVote(v)
+	s.True(ok)
+	s.NoError(err)
+}
+
+func (s *KeyHolderTestSuite) TestCRS() {
+	k := s.setupKeyHolder()
+	b := &types.Block{
+		ParentHash: common.NewRandomHash(),
+		Position: types.Position{
+			ShardID: 7,
+			ChainID: 8,
+			Height:  9,
+		},
+		Timestamp: time.Now().UTC(),
+	}
+	crs := common.NewRandomHash()
+	s.Error(k.SignCRS(b, crs))
+	// Hash block before hash CRS.
+	s.NoError(k.SignBlock(b))
+	s.NoError(k.SignCRS(b, crs))
+	ok, err := k.VerifyCRS(b, crs)
+	s.True(ok)
+	s.NoError(err)
+}
+
+func TestKeyHolder(t *testing.T) {
+	suite.Run(t, new(KeyHolderTestSuite))
+}