Added all code for integrity check transform

syzygy/experimental/protect/protect_lib/protect_util.cc

+// Copyright 2015 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "syzygy/protect/protect_lib/protect_util.h"
+#include <algorithm>
+#include <ctime>
+#include <iostream>
+#include <vector>
+
+unsigned int VectGenerator::_kSum = 256;
+
+std::vector<uint8>* VectGenerator::Generate(uint8 x, int len)
+{
+  unsigned int max_sum = _kSum - x;
+  int rand_num;
+  std::vector<uint8> *values = new std::vector<uint8>();
+
+  if (max_sum < 0) {
+    return NULL;
+  }
+
+  std::srand(unsigned(std::time(0)));
+
+  for (int i = 0; i < len - 1; ++i) {
+    rand_num = std::rand() % max_sum;
+    values->push_back(rand_num);
+
+    max_sum -= rand_num;
+
+    if (max_sum < 0) {
+      return NULL;
+    }
+  }
+
+  values->push_back(max_sum);
+
+  std::random_shuffle(values->begin(), values->end());
+
+  return values;
+}