core: ValidatorID.Hash is the hash of public key. (#49)

2 files changed, 8 insertions, 0 deletions

diff --git a/crypto/eth/eth.go b/crypto/eth/eth.go
index edf50d3..975d8a8 100644
--- a/crypto/eth/eth.go
+++ b/crypto/eth/eth.go
@@ -104,6 +104,11 @@ func (pub PublicKey) Compress() []byte {
 	return pub.publicKey
 }
 
+// Bytes returns the []byte representation of public key.
+func (pub PublicKey) Bytes() []byte {
+	return pub.Compress()
+}
+
 // SigToPub returns the PublicKey that created the given signature.
 func SigToPub(
 	hash common.Hash, signature crypto.Signature) (PublicKey, error) {
diff --git a/crypto/interfaces.go b/crypto/interfaces.go
index 015ff40..280082e 100644
--- a/crypto/interfaces.go
+++ b/crypto/interfaces.go
@@ -39,4 +39,7 @@ type PrivateKey interface {
 type PublicKey interface {
 	// VerifySignature checks that the given public key created signature over hash.
 	VerifySignature(hash common.Hash, signature Signature) bool
+
+	// Bytes returns the []byte representation of public key.
+	Bytes() []byte
 }