diff --git a/tests/key-chain-fixture.cpp b/tests/key-chain-fixture.cpp
new file mode 100644
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--- /dev/null
+++ b/tests/key-chain-fixture.cpp
@@ -0,0 +1,113 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2019,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "tests/key-chain-fixture.hpp"
+
+#include <ndn-cxx/security/pib/identity.hpp>
+#include <ndn-cxx/security/pib/key.hpp>
+#include <ndn-cxx/security/pib/pib.hpp>
+#include <ndn-cxx/security/transform.hpp>
+#include <ndn-cxx/security/v2/certificate.hpp>
+#include <ndn-cxx/util/io.hpp>
+
+#include <boost/filesystem.hpp>
+
+namespace nfd {
+namespace tests {
+
+KeyChainFixture::KeyChainFixture()
+  : m_keyChain("pib-memory:", "tpm-memory:")
+{
+  m_keyChain.createIdentity("/DEFAULT");
+}
+
+KeyChainFixture::~KeyChainFixture()
+{
+  boost::system::error_code ec;
+  for (const auto& certFile : m_certFiles) {
+    boost::filesystem::remove(certFile, ec); // ignore error
+  }
+}
+
+bool
+KeyChainFixture::addIdentity(const Name& identity, const ndn::KeyParams& params)
+{
+  try {
+    m_keyChain.createIdentity(identity, params);
+    return true;
+  }
+  catch (const std::runtime_error&) {
+    return false;
+  }
+}
+
+bool
+KeyChainFixture::saveIdentityCertificate(const Name& identity, const std::string& filename, bool allowAdd)
+{
+  ndn::security::v2::Certificate cert;
+  try {
+    cert = m_keyChain.getPib().getIdentity(identity).getDefaultKey().getDefaultCertificate();
+  }
+  catch (const ndn::security::Pib::Error&) {
+    if (allowAdd && addIdentity(identity)) {
+      return saveIdentityCertificate(identity, filename, false);
+    }
+    return false;
+  }
+
+  m_certFiles.push_back(filename);
+  try {
+    ndn::io::save(cert, filename);
+    return true;
+  }
+  catch (const ndn::io::Error&) {
+    return false;
+  }
+}
+
+std::string
+KeyChainFixture::getIdentityCertificateBase64(const Name& identity, bool allowAdd)
+{
+  ndn::security::v2::Certificate cert;
+  try {
+    cert = m_keyChain.getPib().getIdentity(identity).getDefaultKey().getDefaultCertificate();
+  }
+  catch (const ndn::security::Pib::Error&) {
+    if (!allowAdd) {
+      NDN_THROW_NESTED(std::runtime_error("Identity does not exist"));
+    }
+    cert = m_keyChain.createIdentity(identity).getDefaultKey().getDefaultCertificate();
+  }
+
+  const auto& block = cert.wireEncode();
+
+  namespace tr = ndn::security::transform;
+  std::ostringstream oss;
+  tr::bufferSource(block.wire(), block.size()) >> tr::base64Encode(false) >> tr::streamSink(oss);
+  return oss.str();
+}
+
+} // namespace tests
+} // namespace nfd