VBoot Reference: Add version checking to for preventing rollbacks.

src/platform/vboot_reference/tests/rollback_index_mock.c

+/* Copyright (c) 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.
+ *
+ * Mock rollback index library for testing.
+ */
+
+#include "rollback_index.h"
+
+#include <stdio.h>
+#include <stdint.h>
+
+uint16_t g_firmware_key_version = 0;
+uint16_t g_firmware_version = 0;
+uint16_t g_kernel_key_version = 0;
+uint16_t g_kernel_version = 0;
+
+void SetupTPM(void) {
+  fprintf(stderr, "Rollback Index Library Mock: TPM initialized.\n");
+}
+
+uint16_t GetStoredVersion(int type) {
+  switch (type) {
+    case FIRMWARE_KEY_VERSION:
+      return g_firmware_key_version;
+      break;
+    case FIRMWARE_VERSION:
+      return g_firmware_version;
+      break;
+    case KERNEL_KEY_VERSION:
+      return g_kernel_key_version;
+      break;
+    case KERNEL_VERSION:
+      return g_kernel_version;
+      break;
+  }
+  return 0;
+}
+
+int WriteStoredVersion(int type, uint16_t version) {
+  switch (type) {
+    case FIRMWARE_KEY_VERSION:
+      g_firmware_key_version = version;
+      break;
+    case FIRMWARE_VERSION:
+      g_firmware_version = version;
+      break;
+    case KERNEL_KEY_VERSION:
+      g_kernel_key_version = version;
+      break;
+    case KERNEL_VERSION:
+      g_kernel_version = version;
+      break;
+  }
+  fprintf(stderr, "Rollback Index Library Mock: Stored Version written.\n");
+  return 1;
+}
+
+void LockStoredVersion(int type) {
+  fprintf(stderr, "Rollback Index Library Mock: Version Locked.\n");
+}