1// Copyright (c) 2013 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#include "crypto/hkdf.h"
6
7#include <string>
8
9#include "base/strings/string_number_conversions.h"
10#include "testing/gtest/include/gtest/gtest.h"
11
12using crypto::HKDF;
13
14namespace test {
15namespace {
16
17struct HKDFTest {
18  const char* key_hex;
19  const char* salt_hex;
20  const char* info_hex;
21  const char* output_hex;
22};
23
24// These test cases are taken from
25// https://tools.ietf.org/html/rfc5869#appendix-A.
26static const HKDFTest kHKDFTests[] = {{
27    "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
28    "000102030405060708090a0b0c",
29    "f0f1f2f3f4f5f6f7f8f9",
30    "3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007208d5"
31    "b887185865",
32  }, {
33    "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f2021222324"
34    "25262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f40414243444546474849"
35    "4a4b4c4d4e4f",
36    "606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f8081828384"
37    "85868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9"
38    "aaabacadaeaf",
39    "b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4"
40    "d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9"
41    "fafbfcfdfeff",
42    "b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c59045a99ca"
43    "c7827271cb41c65e590e09da3275600c2f09b8367793a9aca3db71cc30c58179ec3e87c14c"
44    "01d5c1f3434f1d87",
45  }, {
46    "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
47    "",
48    "",
49    "8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d9d201395fa"
50    "a4b61a96c8",
51  },
52};
53
54TEST(HKDFTest, HKDF) {
55  for (size_t i = 0; i < arraysize(kHKDFTests); i++) {
56    const HKDFTest& test(kHKDFTests[i]);
57    SCOPED_TRACE(i);
58
59    std::vector<uint8> data;
60    ASSERT_TRUE(base::HexStringToBytes(test.key_hex, &data));
61    const std::string key(reinterpret_cast<char*>(&data[0]), data.size());
62
63    data.clear();
64    // |salt_hex| is optional and may be empty.
65    std::string salt(test.salt_hex);
66    if (!salt.empty()) {
67      ASSERT_TRUE(base::HexStringToBytes(salt, &data));
68      salt.assign(reinterpret_cast<char*>(&data[0]), data.size());
69    }
70
71    data.clear();
72    // |info_hex| is optional and may be empty.
73    std::string info(test.info_hex);
74    if (!info.empty()) {
75      ASSERT_TRUE(base::HexStringToBytes(info, &data));
76      info.assign(reinterpret_cast<char*>(&data[0]), data.size());
77    }
78
79    data.clear();
80    ASSERT_TRUE(base::HexStringToBytes(test.output_hex, &data));
81    const std::string expected(reinterpret_cast<char*>(&data[0]), data.size());
82
83    // We set the key_length to the length of the expected output and then take
84    // the result from the first key, which is the client write key.
85    HKDF hkdf(key, salt, info, expected.size(), 0, 0);
86
87    ASSERT_EQ(expected.size(), hkdf.client_write_key().size());
88    EXPECT_EQ(0, memcmp(expected.data(), hkdf.client_write_key().data(),
89                        expected.size()));
90  }
91}
92
93}  // namespace
94}  // namespace test
95