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      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 
     12 using crypto::HKDF;
     13 
     14 namespace test {
     15 namespace {
     16 
     17 struct 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.
     26 static 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 
     54 TEST(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);
     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