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// Copyright (c) 2019 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.
#include "quiche/quic/core/internet_checksum.h"
#include "quiche/quic/platform/api/quic_test.h"
namespace quic {
namespace {
// From the Numerical Example described in RFC 1071
// https://tools.ietf.org/html/rfc1071#section-3
TEST(InternetChecksumTest, MatchesRFC1071Example) {
uint8_t data[] = {0x00, 0x01, 0xf2, 0x03, 0xf4, 0xf5, 0xf6, 0xf7};
InternetChecksum checksum;
checksum.Update(data, 8);
uint16_t result = checksum.Value();
auto* result_bytes = reinterpret_cast<uint8_t*>(&result);
ASSERT_EQ(0x22, result_bytes[0]);
ASSERT_EQ(0x0d, result_bytes[1]);
}
// Same as above, except 7 bytes. Should behave as if there was an 8th byte
// that equals 0.
TEST(InternetChecksumTest, MatchesRFC1071ExampleWithOddByteCount) {
uint8_t data[] = {0x00, 0x01, 0xf2, 0x03, 0xf4, 0xf5, 0xf6};
InternetChecksum checksum;
checksum.Update(data, 7);
uint16_t result = checksum.Value();
auto* result_bytes = reinterpret_cast<uint8_t*>(&result);
ASSERT_EQ(0x23, result_bytes[0]);
ASSERT_EQ(0x04, result_bytes[1]);
}
// From the example described at:
// http://www.cs.berkeley.edu/~kfall/EE122/lec06/tsld023.htm
TEST(InternetChecksumTest, MatchesBerkleyExample) {
uint8_t data[] = {0xe3, 0x4f, 0x23, 0x96, 0x44, 0x27, 0x99, 0xf3};
InternetChecksum checksum;
checksum.Update(data, 8);
uint16_t result = checksum.Value();
auto* result_bytes = reinterpret_cast<uint8_t*>(&result);
ASSERT_EQ(0x1a, result_bytes[0]);
ASSERT_EQ(0xff, result_bytes[1]);
}
TEST(InternetChecksumTest, ChecksumRequiringMultipleCarriesInLittleEndian) {
uint8_t data[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x02, 0x00};
// Data will accumulate to 0x0002FFFF
// Summing lower and upper halves gives 0x00010001
// Second sum of lower and upper halves gives 0x0002
// One's complement gives 0xfffd, or [0xfd, 0xff] in network byte order
InternetChecksum checksum;
checksum.Update(data, 8);
uint16_t result = checksum.Value();
auto* result_bytes = reinterpret_cast<uint8_t*>(&result);
EXPECT_EQ(0xfd, result_bytes[0]);
EXPECT_EQ(0xff, result_bytes[1]);
}
} // namespace
} // namespace quic