core: move crypto to core/crypto (#140)

- Move key-holder to authenticator

   Make core.keyHolder public as core.Authenticator, it
   is not required to make this part an interface.

- Make private when there is no need to go public.
- Fix data race

1 files changed, 41 insertions, 0 deletions

diff --git a/core/crypto/utils.go b/core/crypto/utils.go
new file mode 100644
index 0000000..07a8b2b
--- /dev/null
+++ b/core/crypto/utils.go
@@ -0,0 +1,41 @@
+// 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 crypto
+
+import (
+	"encoding/hex"
+
+	"github.com/ethereum/go-ethereum/crypto"
+
+	"github.com/dexon-foundation/dexon-consensus-core/common"
+)
+
+// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
+// converting it to an internal Hash data structure.
+func Keccak256Hash(data ...[]byte) (h common.Hash) {
+	return common.Hash(crypto.Keccak256Hash(data...))
+}
+
+// Clone returns a deep copy of a signature.
+func (sig Signature) Clone() Signature {
+	return append(Signature{}, sig...)
+}
+
+func (sig Signature) String() string {
+	return hex.EncodeToString([]byte(sig[:]))
+}