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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Uniitest for data encryption functions.
#include "base/logging.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "rlz/lib/crc8.h"
TEST(Crc8Unittest, TestCrc8) {
struct Data {
char string[10];
// Externally calculated checksums use
// http://www.zorc.breitbandkatze.de/crc.html
// with the ATM HEC paramters:
// CRC-8, Polynomial 0x07, Initial value 0x00, Final XOR value 0x55
// (direct, don't reverse data byes, don't reverse CRC before final XOR)
unsigned char external_crc;
int random_byte;
unsigned char corrupt_value;
} data[] = {
{"Google", 0x01, 2, 0x53},
{"GOOGLE", 0xA6, 4, 0x11},
{"My CRC 8!", 0xDC, 0, 0x50},
};
unsigned char* bytes;
unsigned char crc;
bool matches;
int length;
for (size_t i = 0; i < sizeof(data) / sizeof(data[0]); ++i) {
bytes = reinterpret_cast<unsigned char*>(data[i].string);
crc = 0;
matches = false;
length = strlen(data[i].string);
// Calculate CRC and compare against external value.
rlz_lib::Crc8::Generate(bytes, length, &crc);
EXPECT_TRUE(crc == data[i].external_crc);
rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
EXPECT_TRUE(matches);
// Corrupt string and see if CRC still matches.
data[i].string[data[i].random_byte] = data[i].corrupt_value;
rlz_lib::Crc8::Verify(bytes, length, crc, &matches);
EXPECT_FALSE(matches);
}
}
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