Don't handle concrete vals in keccak_func_manager

mythril/laser/ethereum/keccak_function_manager.py

@@ -23,7 +23,6 @@ class KeccakFunctionManager:
         self.store_function = {}  # type: Dict[int, Tuple[Function, Function]]
         self.interval_hook_for_size = {}  # type: Dict[int, int]
         self._index_counter = TOTAL_PARTS - 34534
-        self.concrete_hash_vals = {}  # type: Dict[int, List[BitVec]]
 
     def find_keccak(self, data: BitVec) -> BitVec:
         """
@@ -51,7 +50,6 @@ class KeccakFunctionManager:
         except KeyError:
             func = Function("keccak256_{}".format(length), length, 256)
             inverse = Function("keccak256_{}-1".format(length), 256, length)
-            self.concrete_hash_vals[length] = []
             self.store_function[length] = (func, inverse)
         return func, inverse
 
@@ -73,14 +71,8 @@ class KeccakFunctionManager:
         length = data.size()
         func, inverse = self.get_function(length)
 
-        if data.symbolic:
-            condition = self._create_condition(func_input=data)
-            output = func(data)
-        else:
-            concrete_val = self.find_keccak(data)
-            condition = And(func(data) == concrete_val, inverse(func(data)) == data)
-            self.concrete_hash_vals[length].append(concrete_val)
-            output = concrete_val
+        condition = self._create_condition(func_input=data)
+        output = func(data)
         return output, condition
 
     def _create_condition(self, func_input: BitVec) -> Bool:
@@ -107,8 +99,6 @@ class KeccakFunctionManager:
             ULT(func(func_input), symbol_factory.BitVecVal(upper_bound, 256)),
             URem(func(func_input), symbol_factory.BitVecVal(64, 256)) == 0,
         )
-        for val in self.concrete_hash_vals[length]:
-            cond = Or(cond, func(func_input) == val)
         return cond