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// Copyright 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
#include "tink/subtle/hkdf.h"
#include "tink/subtle/common_enums.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
#include "tink/util/test_util.h"
#include "gtest/gtest.h"
namespace crypto {
namespace tink {
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namespace {
class HkdfTest : public ::testing::Test {};
struct TestVector {
HashType hash_type;
std::string ikm_hex;
std::string salt_hex;
std::string info_hex;
size_t out_len;
std::string out_key_hex;
};
// Tests vectors from RFC 5869.
static const std::vector<TestVector> test_vector(
{{
HashType::SHA256, "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
"000102030405060708090a0b0c", "f0f1f2f3f4f5f6f7f8f9", 42,
"3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007"
"208"
"d5b887185865",
},
{
HashType::SHA256,
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f"
"202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"
"404142434445464748494a4b4c4d4e4f",
"606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f"
"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f"
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf",
"b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeef"
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff",
82,
"b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c"
"59045a99cac7827271cb41c65e590e09da3275600c2f09b8367793a9aca3db71"
"cc30c58179ec3e87c14c01d5c1f3434f1d87",
},
{HashType::SHA256, "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b", "", "",
42,
"8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d"
"9d201395faa4b61a96c8"},
{HashType::SHA1, "0b0b0b0b0b0b0b0b0b0b0b", "000102030405060708090a0b0c",
"f0f1f2f3f4f5f6f7f8f9", 42,
"085a01ea1b10f36933068b56efa5ad81a4f14b822f5b091568a9cdd4f155fda2c22e4224"
"78d305f3f896"},
{HashType::SHA1,
"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f"
"202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"
"404142434445464748494a4b4c4d4e4f",
"606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f"
"808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9f"
"a0a1a2a3a4a5a6a7a8a9aaabacadaeaf",
"b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
"d0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeef"
"f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff",
82,
"0bd770a74d1160f7c9f12cd5912a06ebff6adcae899d92191fe4305673ba2ffe"
"8fa3f1a4e5ad79f3f334b3b202b2173c486ea37ce3d397ed034c7f9dfeb15c5e"
"927336d0441f4c4300e2cff0d0900b52d3b4"},
{HashType::SHA1, "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b", "", "",
42,
"0ac1af7002b3d761d1e55298da9d0506b9ae52057220a306e07b6b87e8df21d0"
"ea00033de03984d34918"}});
TEST_F(HkdfTest, testBasic) {
for (const TestVector& test : test_vector) {
EXPECT_EQ(
test.out_key_hex,
test::HexEncode(Hkdf::ComputeHkdf(
test.hash_type, test::HexDecodeOrDie(test.ikm_hex),
test::HexDecodeOrDie(test.salt_hex),
test::HexDecodeOrDie(test.info_hex), test.out_len)
.ValueOrDie()));
}
}
TEST_F(HkdfTest, testLongOutput) {
TestVector test = test_vector[0];
auto status_or_string = Hkdf::ComputeHkdf(
test.hash_type, test::HexDecodeOrDie(test.ikm_hex),
test::HexDecodeOrDie(test.salt_hex), test::HexDecodeOrDie(test.info_hex),
255 * 32 + 1 /* 255 * hashLength + 1 */);
EXPECT_FALSE(status_or_string.ok());
EXPECT_EQ(status_or_string.status().error_message(),
"BoringSSL's HKDF failed");
}
} // namespace