| // 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 |