diff --git a/app/abci/vote_extension_test.go b/app/abci/vote_extension_test.go
index 280b5942..7d6bd6b6 100644
--- a/app/abci/vote_extension_test.go
+++ b/app/abci/vote_extension_test.go
@@ -38,8 +38,7 @@ func (m *mockSigner) Sign(input []byte, _ utils.SEDAKeyIndex) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	hash := crypto.Keccak256Hash(input)
-	signature, err := crypto.Sign(hash.Bytes(), privKey)
+	signature, err := crypto.Sign(input, privKey)
 	if err != nil {
 		return nil, err
 	}
@@ -101,8 +100,7 @@ func TestExtendVerifyVoteHandlers(t *testing.T) {
 	require.NoError(t, err)
 
 	// Recover and verify public key
-	hash := crypto.Keccak256Hash(mockBatch.BatchId)
-	sigPubKey, err := crypto.Ecrecover(hash.Bytes(), evRes.VoteExtension)
+	sigPubKey, err := crypto.Ecrecover(mockBatch.BatchId, evRes.VoteExtension)
 	require.NoError(t, err)
 	require.Equal(t, expPubKey, sigPubKey)
 
diff --git a/app/utils/seda_keys.go b/app/utils/seda_keys.go
index ef98146e..9c9315a7 100644
--- a/app/utils/seda_keys.go
+++ b/app/utils/seda_keys.go
@@ -166,14 +166,16 @@ func LoadSEDASigner(loadPath string) (SEDASigner, error) {
 	return &sedaKeys{keys: keys}, nil
 }
 
+// Sign returns the signature for the a given hashed input using the
+// key at the given index.
 func (s *sedaKeys) Sign(input []byte, index SEDAKeyIndex) ([]byte, error) {
 	privKey, err := ethcrypto.ToECDSA(s.keys[index].PrivKey.Bytes())
 	if err != nil {
 		return nil, err
 	}
 
-	hash := ethcrypto.Keccak256Hash(input)
-	signature, err := ethcrypto.Sign(hash.Bytes(), privKey)
+	// ethcrypto library already checks if input is 32 bytes (digest length)
+	signature, err := ethcrypto.Sign(input, privKey)
 	if err != nil {
 		return nil, err
 	}