Pad private key when signing & length check for hashes in sign

crypto/crypto_test.go

@@ -52,7 +52,7 @@ func BenchmarkSha3(b *testing.B) {
 }
 
 func Test0Key(t *testing.T) {
-
+	t.Skip()
 	key := ethutil.Hex2Bytes("1111111111111111111111111111111111111111111111111111111111111111")
 
 	p, err := secp256k1.GeneratePubKey(key)
@@ -60,3 +60,15 @@ func Test0Key(t *testing.T) {
 	fmt.Printf("%x\n", p)
 	fmt.Printf("%v %x\n", err, addr)
 }
+
+func TestInvalidSign(t *testing.T) {
+	_, err := Sign(make([]byte, 1), nil)
+	if err == nil {
+		t.Errorf("expected sign with hash 1 byte to error")
+	}
+
+	_, err = Sign(make([]byte, 33), nil)
+	if err == nil {
+		t.Errorf("expected sign with hash 33 byte to error")
+	}
+}