From 73ba419d640920a1427c357e487625ba70ae87b4 Mon Sep 17 00:00:00 2001
From: protolambda <proto@protolambda.com>
Date: Tue, 18 Jun 2019 02:04:10 +0200
Subject: [PATCH] check virtual lengths, fix imports

---
 test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
index 7662971c4..efcb8f207 100644
--- a/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
+++ b/test_libs/pyspec/eth2spec/utils/ssz/ssz_typing.py
@@ -268,7 +268,7 @@ class Elements(ParamsBase, metaclass=ElementsType):
 
     @classmethod
     def value_check(cls, value):
-        return all(isinstance(v, cls.elem_type) for v in value)
+        return all(isinstance(v, cls.elem_type) for v in value) and len(value) <= cls.length
 
     @classmethod
     def extract_args(cls, *args):
@@ -316,6 +316,7 @@ class Vector(Elements):
 
     @classmethod
     def value_check(cls, value):
+        # check length limit strictly
         return len(value) == cls.length and super().value_check(value)
 
     @classmethod
@@ -350,7 +351,8 @@ class BytesLike(Elements, metaclass=BytesType):
 
     @classmethod
     def value_check(cls, value):
-        return isinstance(value, bytes)
+        # check type and virtual length limit
+        return isinstance(value, bytes) and len(value) <= cls.length
 
     def __str__(self):
         cls = self.__class__
@@ -376,6 +378,7 @@ class BytesN(BytesLike):
 
     @classmethod
     def value_check(cls, value):
+        # check length limit strictly
         return len(value) == cls.length and super().value_check(value)
 
     @classmethod