// Copyright (c) 2013 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 "quic/core/crypto/crypto_utils.h"

#include <string>

#include "absl/base/macros.h"
#include "absl/strings/escaping.h"
#include "quic/core/quic_utils.h"
#include "quic/platform/api/quic_test.h"
#include "quic/test_tools/quic_test_utils.h"
#include "common/test_tools/quiche_test_utils.h"

namespace quic {
namespace test {
namespace {

class CryptoUtilsTest : public QuicTest {};

TEST_F(CryptoUtilsTest, TestExportKeyingMaterial) {
  const struct TestVector {
    // Input (strings of hexadecimal digits):
    const char* subkey_secret;
    const char* label;
    const char* context;
    size_t result_len;

    // Expected output (string of hexadecimal digits):
    const char* expected;  // Null if it should fail.
  } test_vector[] = {
      // Try a typical input
      {"4823c1189ecc40fce888fbb4cf9ae6254f19ba12e6d9af54788f195a6f509ca3",
       "e934f78d7a71dd85420fceeb8cea0317",
       "b8d766b5d3c8aba0009c7ed3de553eba53b4de1030ea91383dcdf724cd8b7217", 32,
       "a9979da0d5f1c1387d7cbe68f5c4163ddb445a03c4ad6ee72cb49d56726d679e"},
      // Don't let the label contain nulls
      {"14fe51e082ffee7d1b4d8d4ab41f8c55", "3132333435363700",
       "58585858585858585858585858585858", 16, nullptr},
      // Make sure nulls in the context are fine
      {"d862c2e36b0a42f7827c67ebc8d44df7", "7a5b95e4e8378123",
       "4142434445464700", 16, "12d418c6d0738a2e4d85b2d0170f76e1"},
      // ... and give a different result than without
      {"d862c2e36b0a42f7827c67ebc8d44df7", "7a5b95e4e8378123", "41424344454647",
       16, "abfa1c479a6e3ffb98a11dee7d196408"},
      // Try weird lengths
      {"d0ec8a34f6cc9a8c96", "49711798cc6251",
       "933d4a2f30d22f089cfba842791116adc121e0", 23,
       "c9a46ed0757bd1812f1f21b4d41e62125fec8364a21db7"},
  };

  for (size_t i = 0; i < ABSL_ARRAYSIZE(test_vector); i++) {
    // Decode the test vector.
    std::string subkey_secret =
        absl::HexStringToBytes(test_vector[i].subkey_secret);
    std::string label = absl::HexStringToBytes(test_vector[i].label);
    std::string context = absl::HexStringToBytes(test_vector[i].context);
    size_t result_len = test_vector[i].result_len;
    bool expect_ok = test_vector[i].expected != nullptr;
    std::string expected;
    if (expect_ok) {
      expected = absl::HexStringToBytes(test_vector[i].expected);
    }

    std::string result;
    bool ok = CryptoUtils::ExportKeyingMaterial(subkey_secret, label, context,
                                                result_len, &result);
    EXPECT_EQ(expect_ok, ok);
    if (expect_ok) {
      EXPECT_EQ(result_len, result.length());
      quiche::test::CompareCharArraysWithHexError(
          "HKDF output", result.data(), result.length(), expected.data(),
          expected.length());
    }
  }
}

TEST_F(CryptoUtilsTest, HandshakeFailureReasonToString) {
  EXPECT_STREQ("HANDSHAKE_OK",
               CryptoUtils::HandshakeFailureReasonToString(HANDSHAKE_OK));
  EXPECT_STREQ("CLIENT_NONCE_UNKNOWN_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_UNKNOWN_FAILURE));
  EXPECT_STREQ("CLIENT_NONCE_INVALID_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_INVALID_FAILURE));
  EXPECT_STREQ("CLIENT_NONCE_NOT_UNIQUE_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_NOT_UNIQUE_FAILURE));
  EXPECT_STREQ("CLIENT_NONCE_INVALID_ORBIT_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_INVALID_ORBIT_FAILURE));
  EXPECT_STREQ("CLIENT_NONCE_INVALID_TIME_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_INVALID_TIME_FAILURE));
  EXPECT_STREQ("CLIENT_NONCE_STRIKE_REGISTER_TIMEOUT",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_STRIKE_REGISTER_TIMEOUT));
  EXPECT_STREQ("CLIENT_NONCE_STRIKE_REGISTER_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   CLIENT_NONCE_STRIKE_REGISTER_FAILURE));
  EXPECT_STREQ("SERVER_NONCE_DECRYPTION_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_NONCE_DECRYPTION_FAILURE));
  EXPECT_STREQ("SERVER_NONCE_INVALID_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_NONCE_INVALID_FAILURE));
  EXPECT_STREQ("SERVER_NONCE_NOT_UNIQUE_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_NONCE_NOT_UNIQUE_FAILURE));
  EXPECT_STREQ("SERVER_NONCE_INVALID_TIME_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_NONCE_INVALID_TIME_FAILURE));
  EXPECT_STREQ("SERVER_NONCE_REQUIRED_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_NONCE_REQUIRED_FAILURE));
  EXPECT_STREQ("SERVER_CONFIG_INCHOATE_HELLO_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_CONFIG_INCHOATE_HELLO_FAILURE));
  EXPECT_STREQ("SERVER_CONFIG_UNKNOWN_CONFIG_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SERVER_CONFIG_UNKNOWN_CONFIG_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_INVALID_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_INVALID_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_DECRYPTION_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_DECRYPTION_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_PARSE_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_PARSE_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_DIFFERENT_IP_ADDRESS_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_DIFFERENT_IP_ADDRESS_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_CLOCK_SKEW_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_CLOCK_SKEW_FAILURE));
  EXPECT_STREQ("SOURCE_ADDRESS_TOKEN_EXPIRED_FAILURE",
               CryptoUtils::HandshakeFailureReasonToString(
                   SOURCE_ADDRESS_TOKEN_EXPIRED_FAILURE));
  EXPECT_STREQ("INVALID_EXPECTED_LEAF_CERTIFICATE",
               CryptoUtils::HandshakeFailureReasonToString(
                   INVALID_EXPECTED_LEAF_CERTIFICATE));
  EXPECT_STREQ("MAX_FAILURE_REASON",
               CryptoUtils::HandshakeFailureReasonToString(MAX_FAILURE_REASON));
  EXPECT_STREQ(
      "INVALID_HANDSHAKE_FAILURE_REASON",
      CryptoUtils::HandshakeFailureReasonToString(
          static_cast<HandshakeFailureReason>(MAX_FAILURE_REASON + 1)));
}

TEST_F(CryptoUtilsTest, AuthTagLengths) {
  for (const auto& version : AllSupportedVersions()) {
    for (QuicTag algo : {kAESG, kCC20}) {
      SCOPED_TRACE(version);
      std::unique_ptr<QuicEncrypter> encrypter(
          QuicEncrypter::Create(version, algo));
      size_t auth_tag_size = 12;
      if (version.UsesInitialObfuscators()) {
        auth_tag_size = 16;
      }
      EXPECT_EQ(encrypter->GetCiphertextSize(0), auth_tag_size);
    }
  }
}

}  // namespace
}  // namespace test
}  // namespace quic