rlz/lib/crc8_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // Uniitest for data encryption functions.
   6
   7 #include "base/logging.h"
   8 #include "testing/gmock/include/gmock/gmock.h"
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 #include "rlz/lib/crc8.h"
  12
  13 TEST(Crc8Unittest, TestCrc8) {
  14   struct Data {
  15     char string[10];
  16     // Externally calculated checksums use
  17     // http://www.zorc.breitbandkatze.de/crc.html
  18     // with the ATM HEC paramters:
  19     // CRC-8, Polynomial 0x07, Initial value 0x00, Final XOR value 0x55
  20     // (direct, don't reverse data byes, don't reverse CRC before final XOR)
  21     unsigned char external_crc;
  22     int random_byte;
  23     unsigned char corrupt_value;
  24   } data[] = {
  25     {"Google",    0x01, 2, 0x53},
  26     {"GOOGLE",    0xA6, 4, 0x11},
  27     {"My CRC 8!", 0xDC, 0, 0x50},
  28   };
  29
  30   unsigned char* bytes;
  31   unsigned char crc;
  32   bool matches;
  33   int length;
  34   for (size_t i = 0; i < sizeof(data) / sizeof(data[0]); ++i) {
  35     bytes = reinterpret_cast<unsigned char*>(data[i].string);
  36     crc = 0;
  37     matches = false;
  38     length = strlen(data[i].string);
  39
  40     // Calculate CRC and compare against external value.
  41     rlz_lib::Crc8::Generate(bytes, length, &crc);
  42     EXPECT_TRUE(crc == data[i].external_crc);
  43     rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
  44     EXPECT_TRUE(matches);
  45
  46     // Corrupt string and see if CRC still matches.
  47     data[i].string[data[i].random_byte] = data[i].corrupt_value;
  48     rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
  49     EXPECT_FALSE(matches);
  50   }
  51 }