diff --git a/tests/identity-management-fixture.cpp b/tests/identity-management-fixture.cpp
new file mode 100644
index 0000000..c5aed73
--- /dev/null
+++ b/tests/identity-management-fixture.cpp
@@ -0,0 +1,143 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2017,  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 NLSR (Named-data Link State Routing).
+ * See AUTHORS.md for complete list of NLSR authors and contributors.
+ *
+ * NLSR 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.
+ *
+ * NLSR 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
+ * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "identity-management-fixture.hpp"
+
+#include <ndn-cxx/util/io.hpp>
+#include <ndn-cxx/security/v2/additional-description.hpp>
+
+#include <boost/filesystem.hpp>
+
+namespace nlsr {
+namespace tests {
+
+namespace v2 = ndn::security::v2;
+namespace io = ndn::io;
+namespace time = ndn::time;
+
+IdentityManagementBaseFixture::~IdentityManagementBaseFixture()
+{
+  boost::system::error_code ec;
+  for (const auto& certFile : m_certFiles) {
+    boost::filesystem::remove(certFile, ec); // ignore error
+  }
+}
+
+bool
+IdentityManagementBaseFixture::saveCertToFile(const ndn::Data& obj,
+                                              const std::string& filename)
+{
+  m_certFiles.insert(filename);
+  try {
+    io::save(obj, filename);
+    return true;
+  }
+  catch (const io::Error&) {
+    return false;
+  }
+}
+
+IdentityManagementFixture::IdentityManagementFixture()
+  : m_keyChain("pib-memory:", "tpm-memory:")
+{
+}
+
+ndn::security::Identity
+IdentityManagementFixture::addIdentity(const ndn::Name& identityName,
+                                       const ndn::KeyParams& params)
+{
+  auto identity = m_keyChain.createIdentity(identityName, params);
+  m_identities.insert(identityName);
+  return identity;
+}
+
+bool
+IdentityManagementFixture::saveCertificate(const ndn::security::Identity& identity,
+                                           const std::string& filename)
+{
+  try {
+    auto cert = identity.getDefaultKey().getDefaultCertificate();
+    return saveCertToFile(cert, filename);
+  }
+  catch (const ndn::security::Pib::Error&) {
+    return false;
+  }
+}
+
+ndn::security::Identity
+IdentityManagementFixture::addSubCertificate(const ndn::Name& subIdentityName,
+                                             const ndn::security::Identity& issuer,
+                                             const ndn::KeyParams& params)
+{
+  auto subIdentity = addIdentity(subIdentityName, params);
+
+  v2::Certificate request = subIdentity.getDefaultKey().getDefaultCertificate();
+
+  request.setName(request.getKeyName().append("parent").appendVersion());
+
+  ndn::SignatureInfo info;
+  info.setValidityPeriod(ndn::security::ValidityPeriod(time::system_clock::now(),
+                                                       time::system_clock::now()
+                                                       + time::days(7300)));
+
+  v2::AdditionalDescription description;
+  description.set("type", "sub-certificate");
+  info.appendTypeSpecificTlv(description.wireEncode());
+
+  m_keyChain.sign(request, ndn::signingByIdentity(issuer).setSignatureInfo(info));
+  m_keyChain.setDefaultCertificate(subIdentity.getDefaultKey(), request);
+
+  return subIdentity;
+}
+
+v2::Certificate
+IdentityManagementFixture::addCertificate(const ndn::security::Key& key,
+                                          const std::string& issuer)
+{
+  ndn::Name certificateName = key.getName();
+  certificateName
+    .append(issuer)
+    .appendVersion();
+  v2::Certificate certificate;
+  certificate.setName(certificateName);
+
+  // set metainfo
+  certificate.setContentType(ndn::tlv::ContentType_Key);
+  certificate.setFreshnessPeriod(time::hours(1));
+
+  // set content
+  certificate.setContent(key.getPublicKey().data(), key.getPublicKey().size());
+
+  // set signature-info
+  ndn::SignatureInfo info;
+  info.setValidityPeriod(ndn::security::ValidityPeriod(time::system_clock::now(),
+                                                       time::system_clock::now() + time::days(10)));
+
+  m_keyChain.sign(certificate, ndn::signingByKey(key).setSignatureInfo(info));
+  return certificate;
+}
+
+} // namespace tests
+} // namespace nlsr