Update on feedback, update dbus API, add unit tests. TEST=manual,unit,BVT BUG=3628 323

secure_blob_unittest.cc

+// Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Unit tests for SecureBlob.
+
+#include "secure_blob.h"
+
+#include <base/logging.h>
+#include <chromeos/utility.h>
+#include <gtest/gtest.h>
+
+namespace cryptohome {
+using std::string;
+
+class SecureBlobTest : public ::testing::Test {
+ public:
+  SecureBlobTest() { }
+  virtual ~SecureBlobTest() { }
+
+  static bool FindBlobInBlob(const chromeos::Blob& haystack,
+                             const chromeos::Blob& needle) {
+    if (needle.size() > haystack.size()) {
+      return false;
+    }
+    for (unsigned int start = 0; start <= (haystack.size() - needle.size());
+         start++) {
+      if (memcmp(&haystack[start], &needle[0], needle.size()) == 0) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SecureBlobTest);
+};
+
+TEST_F(SecureBlobTest, AllocationSizeTest) {
+  // Check that allocating a SecureBlob of a specified size works
+  SecureBlob blob(32);
+
+  EXPECT_EQ(32, blob.size());
+}
+
+TEST_F(SecureBlobTest, AllocationCopyTest) {
+  // Check that allocating a SecureBlob with an iterator works
+  unsigned char from_data[32];
+  for (unsigned int i = 0; i < sizeof(from_data); i++) {
+    from_data[i] = i;
+  }
+
+  SecureBlob blob(from_data, sizeof(from_data));
+
+  EXPECT_EQ(sizeof(from_data), blob.size());
+
+  for (unsigned int i = 0; i < sizeof(from_data); i++) {
+    EXPECT_EQ(from_data[i], blob[i]);
+  }
+}
+
+TEST_F(SecureBlobTest, IteratorConstructorTest) {
+  // Check that allocating a SecureBlob with an iterator works
+  chromeos::Blob from_blob(32);
+  for (unsigned int i = 0; i < from_blob.size(); i++) {
+    from_blob[i] = i;
+  }
+
+  SecureBlob blob(from_blob.begin(), from_blob.end());
+
+  EXPECT_EQ(from_blob.size(), blob.size());
+  EXPECT_EQ(true, SecureBlobTest::FindBlobInBlob(from_blob, blob));
+}
+
+TEST_F(SecureBlobTest, ResizeTest) {
+  // Check that resizing a SecureBlob wipes the excess memory.  The test assumes
+  // that resize() down by one will not re-allocate the memory, so the last byte
+  // will still be part of the SecureBlob's allocation
+  unsigned int length = 1024;
+  SecureBlob blob(length);
+  void* original_data = blob.data();
+  for (unsigned int i = 0; i < length; i++) {
+    blob[i] = i;
+  }
+
+  blob.resize(length - 1);
+
+  EXPECT_EQ(original_data, blob.data());
+  EXPECT_EQ(length - 1, blob.size());
+  EXPECT_EQ(0, static_cast<unsigned char*>(blob.data())[length - 1]);
+}
+
+TEST_F(SecureBlobTest, DestructorTest) {
+  // Check that resizing a SecureBlob wipes memory on destruction.  The test
+  // assumes that the unallocated memory will not be reused in the meantime,
+  // which means that this test needs to be done carefully.  It intentionally
+  // accesses freed memory to check of it has been zeroed.
+  unsigned int length = 1024;
+  SecureBlob* blob = new SecureBlob(length);
+  unsigned char* data = static_cast<unsigned char*>(blob->data());
+  for (unsigned int i = 0; i < length; i++) {
+    data[i] = i % 256;
+  }
+
+  delete(blob);
+
+  for (unsigned int i = 0; i < length; i++) {
+    EXPECT_EQ(0, data[i]);
+  }
+}
+
+} // namespace cryptohome