// 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 "base/files/file_path.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_errors.h"
#include "net/base/test_completion_callback.h"
#include "net/base/test_data_directory.h"
#include "net/cert/cert_status_flags.h"
#include "net/cert/cert_verify_result.h"
#include "net/cert/x509_certificate.h"
#include "net/quic/crypto/proof_source.h"
#include "net/quic/crypto/proof_verifier.h"
#include "net/quic/test_tools/crypto_test_utils.h"
#include "net/test/cert_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"

#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif

using std::string;
using std::vector;

namespace net {
namespace test {
namespace {

// TestProofVerifierCallback is a simple callback for a ProofVerifier that
// signals a TestCompletionCallback when called and stores the results from the
// ProofVerifier in pointers passed to the constructor.
class TestProofVerifierCallback : public ProofVerifierCallback {
 public:
  TestProofVerifierCallback(TestCompletionCallback* comp_callback,
                            bool* ok,
                            string* error_details)
      : comp_callback_(comp_callback), ok_(ok), error_details_(error_details) {}

  void Run(bool ok,
           const string& error_details,
           scoped_ptr<ProofVerifyDetails>* details) override {
    *ok_ = ok;
    *error_details_ = error_details;

    comp_callback_->callback().Run(0);
  }

 private:
  TestCompletionCallback* const comp_callback_;
  bool* const ok_;
  string* const error_details_;
};

// RunVerification runs |verifier->VerifyProof| and asserts that the result
// matches |expected_ok|.
void RunVerification(ProofVerifier* verifier,
                     const string& hostname,
                     const string& server_config,
                     QuicVersion quic_version,
                     StringPiece chlo_hash,
                     const vector<string>& certs,
                     const string& proof,
                     bool expected_ok) {
  scoped_ptr<ProofVerifyDetails> details;
  TestCompletionCallback comp_callback;
  bool ok;
  string error_details;
  scoped_ptr<ProofVerifyContext> verify_context(
      CryptoTestUtils::ProofVerifyContextForTesting());
  TestProofVerifierCallback* callback =
      new TestProofVerifierCallback(&comp_callback, &ok, &error_details);

  QuicAsyncStatus status = verifier->VerifyProof(
      hostname, server_config, quic_version, chlo_hash, certs, "", proof,
      verify_context.get(), &error_details, &details, callback);

  switch (status) {
    case QUIC_FAILURE:
      delete callback;
      ASSERT_FALSE(expected_ok);
      ASSERT_NE("", error_details);
      return;
    case QUIC_SUCCESS:
      delete callback;
      ASSERT_TRUE(expected_ok);
      ASSERT_EQ("", error_details);
      return;
    case QUIC_PENDING:
      comp_callback.WaitForResult();
      ASSERT_EQ(expected_ok, ok);
      break;
  }
}

// Reads the certificate named "quic_" + |file_name| in the test data directory.
// The certificate must be PEM encoded. Returns the DER-encoded certificate.
string LoadTestCert(const string& file_name) {
  base::FilePath certs_dir = GetTestCertsDirectory();
  scoped_refptr<X509Certificate> cert =
      ImportCertFromFile(certs_dir, "quic_" + file_name);
  CHECK_NE(static_cast<X509Certificate*>(nullptr), cert.get());

  string der_bytes;
  CHECK(X509Certificate::GetDEREncoded(cert->os_cert_handle(), &der_bytes));
  return der_bytes;
}

class ProofTest : public ::testing::TestWithParam<QuicVersion> {};

}  // namespace

INSTANTIATE_TEST_CASE_P(QuicVersion,
                        ProofTest,
                        ::testing::ValuesIn(QuicSupportedVersions()));

// TODO(rtenneti): Enable testing of ProofVerifier. See http://crbug.com/514468.
TEST_P(ProofTest, DISABLED_Verify) {
  scoped_ptr<ProofSource> source(CryptoTestUtils::ProofSourceForTesting());
  scoped_ptr<ProofVerifier> verifier(
      CryptoTestUtils::ProofVerifierForTesting());

  const string server_config = "server config bytes";
  const string hostname = "test.example.com";
  const string first_chlo_hash = "first chlo hash bytes";
  const string second_chlo_hash = "first chlo hash bytes";
  const QuicVersion quic_version = GetParam();
  scoped_refptr<ProofSource::Chain> chain;
  scoped_refptr<ProofSource::Chain> first_chain;
  string error_details, signature, first_signature, first_cert_sct, cert_sct;
  IPAddress server_ip;

  ASSERT_TRUE(source->GetProof(
      server_ip, hostname, server_config, quic_version, first_chlo_hash,
      false /* no ECDSA */, &first_chain, &first_signature, &first_cert_sct));
  ASSERT_TRUE(source->GetProof(server_ip, hostname, server_config, quic_version,
                               second_chlo_hash, false /* no ECDSA */, &chain,
                               &signature, &cert_sct));

  // Check that the proof source is caching correctly:
  ASSERT_EQ(first_chain->certs, chain->certs);
  if (GetParam() < QUIC_VERSION_31) {
    ASSERT_EQ(signature, first_signature);
  } else {
    // QUIC 31 includes the CHLO hash.
    ASSERT_NE(signature, first_signature);
  }
  ASSERT_EQ(first_cert_sct, cert_sct);

  RunVerification(verifier.get(), hostname, server_config, quic_version,
                  first_chlo_hash, chain->certs, signature, true);

  RunVerification(verifier.get(), "foo.com", server_config, quic_version,
                  first_chlo_hash, chain->certs, signature, false);

  RunVerification(verifier.get(), server_config.substr(1, string::npos),
                  server_config, quic_version, first_chlo_hash, chain->certs,
                  signature, false);

  const string corrupt_signature = "1" + signature;
  RunVerification(verifier.get(), hostname, server_config, quic_version,
                  first_chlo_hash, chain->certs, corrupt_signature, false);

  vector<string> wrong_certs;
  for (size_t i = 1; i < chain->certs.size(); i++) {
    wrong_certs.push_back(chain->certs[i]);
  }
  RunVerification(verifier.get(), "foo.com", server_config, quic_version,
                  first_chlo_hash, wrong_certs, corrupt_signature, false);
}

TEST_P(ProofTest, UseAfterFree) {
  ProofSource* source = CryptoTestUtils::ProofSourceForTesting();

  const string server_config = "server config bytes";
  const string hostname = "test.example.com";
  const string chlo_hash = "proof nonce bytes";
  scoped_refptr<ProofSource::Chain> chain;
  string error_details, signature, cert_sct;
  IPAddress server_ip;

  ASSERT_TRUE(source->GetProof(server_ip, hostname, server_config, GetParam(),
                               chlo_hash, false /* no ECDSA */, &chain,
                               &signature, &cert_sct));

  // Make sure we can safely access results after deleting where they came from.
  EXPECT_FALSE(chain->HasOneRef());
  delete source;
  EXPECT_TRUE(chain->HasOneRef());

  EXPECT_FALSE(chain->certs.empty());
  for (const string& cert : chain->certs) {
    EXPECT_FALSE(cert.empty());
  }
}

// A known answer test that allows us to test ProofVerifier without a working
// ProofSource.
TEST_P(ProofTest, VerifyRSAKnownAnswerTest) {
  if (GetParam() > QUIC_VERSION_30) {
    return;
  }
  // These sample signatures were generated by running the Proof.Verify test
  // and dumping the bytes of the |signature| output of ProofSource::GetProof().
  static const unsigned char signature_data_0[] = {
      0x31, 0xd5, 0xfb, 0x40, 0x30, 0x75, 0xd2, 0x7d, 0x61, 0xf9, 0xd7, 0x54,
      0x30, 0x06, 0xaf, 0x54, 0x0d, 0xb0, 0x0a, 0xda, 0x63, 0xca, 0x7e, 0x9e,
      0xce, 0xba, 0x10, 0x05, 0x1b, 0xa6, 0x7f, 0xef, 0x2b, 0xa3, 0xff, 0x3c,
      0xbb, 0x9a, 0xe4, 0xbf, 0xb8, 0x0c, 0xc1, 0xbd, 0xed, 0xc2, 0x90, 0x68,
      0xeb, 0x45, 0x48, 0xea, 0x3c, 0x95, 0xf8, 0xa2, 0xb9, 0xe7, 0x62, 0x29,
      0x00, 0xc3, 0x18, 0xb4, 0x16, 0x6f, 0x5e, 0xb0, 0xc1, 0x26, 0xc0, 0x4b,
      0x84, 0xf5, 0x97, 0xfc, 0x17, 0xf9, 0x1c, 0x43, 0xb8, 0xf2, 0x3f, 0x38,
      0x32, 0xad, 0x36, 0x52, 0x2c, 0x26, 0x92, 0x7a, 0xea, 0x2c, 0xa2, 0xf4,
      0x28, 0x2f, 0x19, 0x4d, 0x1f, 0x11, 0x46, 0x82, 0xd0, 0xc4, 0x86, 0x56,
      0x5c, 0x97, 0x9e, 0xc6, 0x37, 0x8e, 0xaf, 0x9d, 0x69, 0xe9, 0x4f, 0x5a,
      0x6d, 0x70, 0x75, 0xc7, 0x41, 0x95, 0x68, 0x53, 0x94, 0xca, 0x31, 0x63,
      0x61, 0x9f, 0xb8, 0x8c, 0x3b, 0x75, 0x36, 0x8b, 0x69, 0xa2, 0x35, 0xc0,
      0x4b, 0x77, 0x55, 0x08, 0xc2, 0xb4, 0x56, 0xd2, 0x81, 0xce, 0x9e, 0x25,
      0xdb, 0x50, 0x74, 0xb3, 0x8a, 0xd9, 0x20, 0x42, 0x3f, 0x85, 0x2d, 0xaa,
      0xfd, 0x66, 0xfa, 0xd6, 0x95, 0x55, 0x6b, 0x63, 0x63, 0x04, 0xf8, 0x6c,
      0x3e, 0x08, 0x22, 0x39, 0xb9, 0x9a, 0xe0, 0xd7, 0x01, 0xff, 0xeb, 0x8a,
      0xb9, 0xe2, 0x34, 0xa5, 0xa0, 0x51, 0xe9, 0xbe, 0x15, 0x12, 0xbf, 0xbe,
      0x64, 0x3d, 0x3f, 0x98, 0xce, 0xc1, 0xa6, 0x33, 0x32, 0xd3, 0x5c, 0xa8,
      0x39, 0x93, 0xdc, 0x1c, 0xb9, 0xab, 0x3c, 0x80, 0x62, 0xb3, 0x76, 0x21,
      0xdf, 0x47, 0x1e, 0xa9, 0x0e, 0x5e, 0x8a, 0xbe, 0x66, 0x5b, 0x7c, 0x21,
      0xfa, 0x78, 0x2d, 0xd1, 0x1d, 0x5c, 0x35, 0x8a, 0x34, 0xb2, 0x1a, 0xc2,
      0xc4, 0x4b, 0x53, 0x54,
  };
  static const unsigned char signature_data_1[] = {
      0x01, 0x7b, 0x52, 0x35, 0xe3, 0x51, 0xdd, 0xf1, 0x67, 0x8d, 0x31, 0x5e,
      0xa3, 0x75, 0x1f, 0x68, 0x6c, 0xdd, 0x41, 0x7a, 0x18, 0x25, 0xe0, 0x12,
      0x6e, 0x84, 0x46, 0x5e, 0xb2, 0x98, 0xd7, 0x84, 0xe1, 0x62, 0xe0, 0xc1,
      0xc4, 0xd7, 0x4f, 0x4f, 0x80, 0xc1, 0x92, 0xd6, 0x02, 0xaf, 0xca, 0x28,
      0x9f, 0xe0, 0xf3, 0x74, 0xd7, 0xf1, 0x44, 0x67, 0x59, 0x27, 0xc8, 0xc2,
      0x8b, 0xd4, 0xe5, 0x4a, 0x07, 0xfd, 0x00, 0xd6, 0x8a, 0xbf, 0x8b, 0xcd,
      0x6a, 0xe0, 0x1d, 0xf6, 0x4b, 0x68, 0x0f, 0xcf, 0xb9, 0xd0, 0xa1, 0xbc,
      0x2e, 0xcf, 0x7c, 0x03, 0x47, 0x11, 0xe4, 0x4c, 0xbc, 0x1b, 0x6b, 0xa5,
      0x2a, 0x82, 0x86, 0xa4, 0x7f, 0x1d, 0x85, 0x64, 0x21, 0x10, 0xd2, 0xb2,
      0xa0, 0x31, 0xa2, 0x78, 0xe6, 0xf2, 0xea, 0x96, 0x38, 0x8c, 0x9a, 0xe1,
      0x01, 0xab, 0x8e, 0x95, 0x66, 0xc8, 0xe5, 0xcc, 0x80, 0xa3, 0xbd, 0x16,
      0xa7, 0x79, 0x19, 0x39, 0x61, 0x3d, 0xff, 0x37, 0xca, 0x9f, 0x97, 0x05,
      0xc7, 0xcb, 0xf0, 0xea, 0xaf, 0x64, 0x07, 0xc0, 0xed, 0x2a, 0x98, 0xa4,
      0xaf, 0x04, 0x6f, 0xf2, 0xc9, 0xb2, 0x73, 0x9a, 0x56, 0x85, 0x43, 0x64,
      0x5f, 0xaa, 0xb7, 0xff, 0x31, 0x4c, 0x2e, 0x6c, 0x17, 0xcf, 0xe5, 0xbe,
      0x7f, 0x7e, 0xad, 0xf5, 0x6f, 0x84, 0x50, 0x20, 0x29, 0xb3, 0x57, 0xe7,
      0xb1, 0xdc, 0x2c, 0x95, 0x48, 0xfe, 0xb0, 0xc1, 0x92, 0xda, 0xc5, 0x58,
      0x95, 0xb0, 0x1a, 0x3a, 0x05, 0x71, 0x3c, 0x6d, 0x20, 0x01, 0x4c, 0xa9,
      0xe4, 0x38, 0x08, 0x65, 0xb4, 0xbd, 0x86, 0x76, 0xbd, 0xad, 0x25, 0x06,
      0x74, 0x0b, 0xca, 0x95, 0x27, 0x0c, 0x13, 0x08, 0x7e, 0x30, 0xcf, 0xf6,
      0xb5, 0xc1, 0x2a, 0x08, 0xfc, 0x4b, 0xc6, 0xb5, 0x2f, 0x23, 0x27, 0x32,
      0x89, 0xdb, 0x0e, 0x4a,
  };
  static const unsigned char signature_data_2[] = {
      0x6d, 0x7d, 0x22, 0x8c, 0x85, 0xc4, 0x8a, 0x80, 0x05, 0xe4, 0x3c, 0xaf,
      0x10, 0x3b, 0xe3, 0x51, 0xb1, 0x86, 0x52, 0x63, 0xb6, 0x17, 0x33, 0xbd,
      0x1b, 0x1e, 0xc4, 0x50, 0x10, 0xfc, 0xcc, 0xea, 0x6b, 0x11, 0xeb, 0x6d,
      0x5e, 0x00, 0xe7, 0xf3, 0x67, 0x99, 0x74, 0x53, 0x12, 0x8f, 0xe4, 0x3e,
      0x20, 0x17, 0x8e, 0x83, 0xe6, 0xdc, 0x83, 0x91, 0x0e, 0xf3, 0x69, 0x22,
      0x95, 0x14, 0xdf, 0xc1, 0xda, 0xb5, 0xdb, 0x6a, 0x1a, 0xb4, 0x4f, 0x26,
      0xd0, 0x32, 0x1d, 0x73, 0x95, 0x1f, 0x39, 0x1d, 0x00, 0xcb, 0xc3, 0x92,
      0x49, 0x53, 0xcb, 0x5c, 0x36, 0x70, 0x19, 0xd9, 0x64, 0x36, 0xda, 0xfb,
      0x20, 0xe5, 0x47, 0xd9, 0x08, 0xc6, 0x5a, 0x9e, 0x87, 0x1a, 0xdb, 0x11,
      0x7b, 0x17, 0xfc, 0x53, 0x7b, 0xc1, 0xa0, 0xc0, 0x33, 0xcf, 0x96, 0xba,
      0x03, 0x79, 0x8e, 0xc6, 0x05, 0xd2, 0xb7, 0xa2, 0xe2, 0xc1, 0x67, 0xb7,
      0x6a, 0xeb, 0xb1, 0x40, 0xbb, 0x7d, 0x57, 0xcb, 0xc2, 0x60, 0x9f, 0xf1,
      0x72, 0xe5, 0xad, 0xce, 0x95, 0x45, 0x7c, 0xbc, 0x75, 0x81, 0x45, 0x19,
      0xe1, 0xa7, 0x2f, 0x05, 0x52, 0xeb, 0xed, 0xdd, 0x19, 0xd9, 0x1a, 0xc9,
      0x5a, 0x06, 0x8e, 0x29, 0x54, 0xb5, 0x4f, 0x80, 0xaa, 0x36, 0x36, 0xc0,
      0xff, 0x64, 0xac, 0xe8, 0x0f, 0x99, 0x35, 0x5e, 0xc6, 0x72, 0x1f, 0x8c,
      0xc4, 0x2b, 0x7d, 0xc1, 0xfb, 0xf0, 0x12, 0x61, 0xb1, 0x18, 0x65, 0xdd,
      0xc2, 0x38, 0x92, 0xba, 0x84, 0xf8, 0xc8, 0x5e, 0x17, 0x63, 0xe0, 0x9c,
      0x2c, 0xe6, 0x70, 0x71, 0xdc, 0xe5, 0xc1, 0xea, 0xb3, 0x9a, 0xb6, 0x91,
      0xdc, 0xc5, 0x56, 0x84, 0x8a, 0x31, 0x31, 0x23, 0x61, 0x94, 0x7e, 0x01,
      0x22, 0x49, 0xf3, 0xcb, 0x0e, 0x31, 0x03, 0x04, 0x1b, 0x14, 0x43, 0x7c,
      0xad, 0x42, 0xe5, 0x55,
  };

  scoped_ptr<ProofVerifier> verifier(
      CryptoTestUtils::RealProofVerifierForTesting());

  const string server_config = "server config bytes";
  const string hostname = "test.example.com";
  const string chlo_hash = "proof nonce bytes";
  const QuicVersion quic_version = GetParam();

  vector<string> certs(2);
  certs[0] = LoadTestCert("test.example.com.crt");
  certs[1] = LoadTestCert("intermediate.crt");

  // Signatures are nondeterministic, so we test multiple signatures on the
  // same server_config.
  vector<string> signatures(3);
  signatures[0].assign(reinterpret_cast<const char*>(signature_data_0),
                       sizeof(signature_data_0));
  signatures[1].assign(reinterpret_cast<const char*>(signature_data_1),
                       sizeof(signature_data_1));
  signatures[2].assign(reinterpret_cast<const char*>(signature_data_2),
                       sizeof(signature_data_2));

  for (size_t i = 0; i < signatures.size(); i++) {
    const string& signature = signatures[i];

    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, certs, signature, true);
    RunVerification(verifier.get(), "foo.com", server_config, quic_version,
                    chlo_hash, certs, signature, false);
    RunVerification(verifier.get(), hostname,
                    server_config.substr(1, string::npos), quic_version,
                    chlo_hash, certs, signature, false);

    const string corrupt_signature = "1" + signature;
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, certs, corrupt_signature, false);

    vector<string> wrong_certs;
    for (size_t i = 1; i < certs.size(); i++) {
      wrong_certs.push_back(certs[i]);
    }
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, wrong_certs, signature, false);
  }
}

// A known answer test that allows us to test ProofVerifier without a working
// ProofSource.
TEST_P(ProofTest, VerifyECDSAKnownAnswerTest) {
  if (GetParam() > QUIC_VERSION_30) {
    return;
  }
// These sample signatures were generated by running the Proof.Verify test
// (modified to use ECDSA for signing proofs) and dumping the bytes of the
// |signature| output of ProofSource::GetProof().

// Disable this test on platforms that do not support ECDSA certificates.
#if defined(OS_WIN)
  if (base::win::GetVersion() < base::win::VERSION_VISTA)
    return;
#endif

  // These sample signatures were generated by running the Proof.Verify test
  // (modified to use ECDSA for signing proofs) and dumping the bytes of the
  // |signature| output of ProofSource::GetProof().
  static const unsigned char signature_data_0[] = {
      0x30, 0x45, 0x02, 0x21, 0x00, 0x89, 0xc4, 0x7d, 0x08, 0xd1, 0x49, 0x19,
      0x6c, 0xd1, 0x7c, 0xb9, 0x25, 0xe0, 0xe3, 0xbd, 0x6a, 0x5c, 0xd7, 0xaa,
      0x0c, 0xdc, 0x4f, 0x8e, 0xeb, 0xde, 0xbf, 0x32, 0xf8, 0xd1, 0x84, 0x95,
      0x97, 0x02, 0x20, 0x29, 0x3d, 0x49, 0x22, 0x73, 0xed, 0x8b, 0xde, 0x3d,
      0xc2, 0xa4, 0x20, 0xcc, 0xe7, 0xc8, 0x2a, 0x85, 0x20, 0x9b, 0x5b, 0xda,
      0xcd, 0x58, 0x23, 0xbe, 0x89, 0x73, 0x31, 0x87, 0x51, 0xd1, 0x01,
  };
  static const unsigned char signature_data_1[] = {
      0x30, 0x46, 0x02, 0x21, 0x00, 0xec, 0xdf, 0x69, 0xc8, 0x24, 0x59, 0x93,
      0xda, 0x49, 0xee, 0x37, 0x28, 0xaf, 0xeb, 0x0e, 0x2f, 0x80, 0x17, 0x4b,
      0x3b, 0xf6, 0x54, 0xcd, 0x3b, 0x86, 0xc5, 0x98, 0x0d, 0xff, 0xc6, 0xb1,
      0xe7, 0x02, 0x21, 0x00, 0xe1, 0x36, 0x8c, 0xc0, 0xf4, 0x50, 0x5f, 0xba,
      0xfb, 0xe2, 0xff, 0x1d, 0x5d, 0x64, 0xe4, 0x07, 0xbb, 0x5a, 0x4b, 0x19,
      0xb6, 0x39, 0x7a, 0xc4, 0x12, 0xc6, 0xe5, 0x42, 0xc8, 0x78, 0x33, 0xcd,
  };
  static const unsigned char signature_data_2[] = {
      0x30, 0x45, 0x02, 0x20, 0x09, 0x51, 0xe9, 0xde, 0xdb, 0x01, 0xfd, 0xb4,
      0xd8, 0x20, 0xbb, 0xad, 0x41, 0xe3, 0xaa, 0xe7, 0xa3, 0xc3, 0x32, 0x10,
      0x9d, 0xfa, 0x37, 0xce, 0x17, 0xd1, 0x29, 0xf9, 0xd4, 0x1d, 0x0d, 0x19,
      0x02, 0x21, 0x00, 0xc6, 0x20, 0xd4, 0x28, 0xf9, 0x70, 0xb5, 0xb4, 0xff,
      0x4a, 0x35, 0xba, 0xa0, 0xf2, 0x8e, 0x00, 0xf7, 0xcb, 0x43, 0xaf, 0x2d,
      0x1f, 0xce, 0x92, 0x05, 0xca, 0x29, 0xfe, 0xd2, 0x8f, 0xd9, 0x31,
  };

  scoped_ptr<ProofVerifier> verifier(
      CryptoTestUtils::RealProofVerifierForTesting());

  const string server_config = "server config bytes";
  const string hostname = "test.example.com";
  const string chlo_hash = "chlo_hash nonce bytes";
  const QuicVersion quic_version = GetParam();

  vector<string> certs(2);
  certs[0] = LoadTestCert("test_ecc.example.com.crt");
  certs[1] = LoadTestCert("intermediate.crt");

  // Signatures are nondeterministic, so we test multiple signatures on the
  // same server_config.
  vector<string> signatures(3);
  signatures[0].assign(reinterpret_cast<const char*>(signature_data_0),
                       sizeof(signature_data_0));
  signatures[1].assign(reinterpret_cast<const char*>(signature_data_1),
                       sizeof(signature_data_1));
  signatures[2].assign(reinterpret_cast<const char*>(signature_data_2),
                       sizeof(signature_data_2));

  for (size_t i = 0; i < signatures.size(); i++) {
    LOG(ERROR) << "====================" << i << "======================";
    const string& signature = signatures[i];

    LOG(ERROR) << "=================== expect ok =====================";
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, certs, signature, true);
    LOG(ERROR) << "=================== hose_name = foo.com =============";
    RunVerification(verifier.get(), "foo.com", server_config, quic_version,
                    chlo_hash, certs, signature, false);
    LOG(ERROR) << "================== server_config ====================";
    RunVerification(verifier.get(), hostname,
                    server_config.substr(1, string::npos), quic_version,
                    chlo_hash, certs, signature, false);

    // An ECDSA signature is DER-encoded. Corrupt the last byte so that the
    // signature can still be DER-decoded correctly.
    string corrupt_signature = signature;
    corrupt_signature[corrupt_signature.size() - 1] += 1;
    LOG(ERROR) << "================= corrupt signature =======================";
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, certs, corrupt_signature, false);

    // Prepending a "1" makes the DER invalid.
    const string bad_der_signature1 = "1" + signature;
    LOG(ERROR) << "=========================bad der signature ===============";
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, certs, bad_der_signature1, false);

    vector<string> wrong_certs;
    for (size_t i = 1; i < certs.size(); i++) {
      wrong_certs.push_back(certs[i]);
    }
    LOG(ERROR) << "==================== wrong certs =========================";
    RunVerification(verifier.get(), hostname, server_config, quic_version,
                    chlo_hash, wrong_certs, signature, false);
  }
}

}  // namespace test
}  // namespace net