diff --git a/tests/unit-tests/security/conf/checker.t.cpp b/tests/unit-tests/security/conf/checker.t.cpp
index ea26b0c..e989237 100644
--- a/tests/unit-tests/security/conf/checker.t.cpp
+++ b/tests/unit-tests/security/conf/checker.t.cpp
@@ -102,16 +102,24 @@
 
   Name packetName("/SecurityTestConfChecker/CustomizedCheckerTest1/Data");
   shared_ptr<Data> data1 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data1, identity);
+  m_keyChain.sign(*data1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data2 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data2, identity2);
+  m_keyChain.sign(*data2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   shared_ptr<Interest> interest1 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest1, identity);
+  m_keyChain.sign(*interest1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Interest> interest2 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest2, identity2);
+  m_keyChain.sign(*interest2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   int8_t result = 0;
 
@@ -237,16 +245,24 @@
 
   Name packetName("/SecurityTestConfChecker/CustomizedCheckerTest2/Data");
   shared_ptr<Data> data1 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data1, identity);
+  m_keyChain.sign(*data1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data2 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data2, identity2);
+  m_keyChain.sign(*data2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   shared_ptr<Interest> interest1 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest1, identity);
+  m_keyChain.sign(*interest1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Interest> interest2 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest2, identity2);
+  m_keyChain.sign(*interest2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   int8_t result = 0;
 
@@ -293,16 +309,24 @@
 
   Name packetName("/SecurityTestConfChecker/CustomizedCheckerTest3/Data");
   shared_ptr<Data> data1 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data1, identity);
+  m_keyChain.sign(*data1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data2 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data2, identity2);
+  m_keyChain.sign(*data2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   shared_ptr<Interest> interest1 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest1, identity);
+  m_keyChain.sign(*interest1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Interest> interest2 = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*interest2, identity2);
+  m_keyChain.sign(*interest2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   int8_t result = 0;
 
@@ -358,22 +382,34 @@
   Name packetName3("/SecurityTestConfChecker/HierarchicalCheckerTest1");
 
   shared_ptr<Data> data1 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data1, identity);
+  m_keyChain.sign(*data1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data2 = make_shared<Data>(packetName2);
-  m_keyChain.signByIdentity(*data2, identity);
+  m_keyChain.sign(*data2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data3 = make_shared<Data>(packetName3);
-  m_keyChain.signByIdentity(*data3, identity);
+  m_keyChain.sign(*data3,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data4 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data4, identity2);
+  m_keyChain.sign(*data4,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   shared_ptr<Data> data5 = make_shared<Data>(packetName2);
-  m_keyChain.signByIdentity(*data5, identity2);
+  m_keyChain.sign(*data5,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   shared_ptr<Data> data6 = make_shared<Data>(packetName3);
-  m_keyChain.signByIdentity(*data6, identity2);
+  m_keyChain.sign(*data6,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   int8_t result = 0;
 
@@ -460,10 +496,14 @@
   Name packetName("/Test/Data");
 
   shared_ptr<Data> data1 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data1, identity);
+  m_keyChain.sign(*data1,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity));
 
   shared_ptr<Data> data2 = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*data2, identity2);
+  m_keyChain.sign(*data2,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        identity2));
 
   std::vector<shared_ptr<IdentityCertificate> > certSet1;
   certSet1.push_back(cert1);
diff --git a/tests/unit-tests/security/digest-sha256.t.cpp b/tests/unit-tests/security/digest-sha256.t.cpp
index b0cdebc..ebf50c7 100644
--- a/tests/unit-tests/security/digest-sha256.t.cpp
+++ b/tests/unit-tests/security/digest-sha256.t.cpp
@@ -54,7 +54,7 @@
   char content[5] = "1234";
   testData.setContent(reinterpret_cast<uint8_t*>(content), 5);
 
-  m_keyChain.signWithSha256(testData);
+  m_keyChain.sign(testData, security::SigningInfo(security::SigningInfo::SIGNER_TYPE_SHA256));
 
   testData.wireEncode();
 
@@ -70,7 +70,7 @@
   Name name("/SecurityTestDigestSha256/InterestSignature/Interest1");
   Interest testInterest(name);
 
-  m_keyChain.signWithSha256(testInterest);
+  m_keyChain.sign(testInterest, security::SigningInfo(security::SigningInfo::SIGNER_TYPE_SHA256));
   testInterest.wireEncode();
   const Name& signedName = testInterest.getName();
 
diff --git a/tests/unit-tests/security/key-chain.t.cpp b/tests/unit-tests/security/key-chain.t.cpp
index d364dcf..a6c0cbe 100644
--- a/tests/unit-tests/security/key-chain.t.cpp
+++ b/tests/unit-tests/security/key-chain.t.cpp
@@ -20,6 +20,7 @@
  */
 
 #include "security/key-chain.hpp"
+#include "security/validator.hpp"
 #include "../util/test-home-environment-fixture.hpp"
 #include <boost/filesystem.hpp>
 
@@ -27,6 +28,7 @@
 #include "dummy-keychain.hpp"
 
 namespace ndn {
+namespace security {
 namespace tests {
 
 BOOST_FIXTURE_TEST_SUITE(SecurityKeyChain, util::TestHomeEnvironmentFixture)
@@ -341,7 +343,82 @@
   BOOST_CHECK_EQUAL(keyChain.getDefaultIdentity(), "/dummy/key");
 }
 
+BOOST_AUTO_TEST_CASE(GeneralSigningInterface)
+{
+  KeyChain keyChain;
+  Name id("/id");
+  Name certName = keyChain.createIdentity(id);
+  shared_ptr<IdentityCertificate> idCert = keyChain.getCertificate(certName);
+  Name keyName = idCert->getPublicKeyName();
+  keyChain.setDefaultIdentity(id);
+
+  Name id2("/id2");
+  Name cert2Name = keyChain.createIdentity(id2);
+  shared_ptr<IdentityCertificate> id2Cert = keyChain.getCertificate(cert2Name);
+
+  // SigningInfo is set to default
+  Data data1("/data1");
+  keyChain.sign(data1);
+  BOOST_CHECK(Validator::verifySignature(data1, idCert->getPublicKeyInfo()));
+  BOOST_CHECK_EQUAL(data1.getSignature().getKeyLocator().getName(), certName.getPrefix(-1));
+
+  Interest interest1("/interest1");
+  keyChain.sign(interest1);
+  BOOST_CHECK(Validator::verifySignature(interest1, idCert->getPublicKeyInfo()));
+  SignatureInfo sigInfo1(interest1.getName()[-2].blockFromValue());
+  BOOST_CHECK_EQUAL(sigInfo1.getKeyLocator().getName(), certName.getPrefix(-1));
+
+  // SigningInfo is set to Identity
+  Data data2("/data2");
+  keyChain.sign(data2, SigningInfo(SigningInfo::SIGNER_TYPE_ID, id2));
+  BOOST_CHECK(Validator::verifySignature(data2, id2Cert->getPublicKeyInfo()));
+  BOOST_CHECK_EQUAL(data2.getSignature().getKeyLocator().getName(), cert2Name.getPrefix(-1));
+
+  Interest interest2("/interest2");
+  keyChain.sign(interest2, SigningInfo(SigningInfo::SIGNER_TYPE_ID, id2));
+  BOOST_CHECK(Validator::verifySignature(interest2, id2Cert->getPublicKeyInfo()));
+  SignatureInfo sigInfo2(interest2.getName()[-2].blockFromValue());
+  BOOST_CHECK_EQUAL(sigInfo2.getKeyLocator().getName(), cert2Name.getPrefix(-1));
+
+  // SigningInfo is set to Key
+  Data data3("/data3");
+  keyChain.sign(data3, SigningInfo(SigningInfo::SIGNER_TYPE_KEY, keyName));
+  BOOST_CHECK(Validator::verifySignature(data3, idCert->getPublicKeyInfo()));
+  BOOST_CHECK_EQUAL(data3.getSignature().getKeyLocator().getName(), certName.getPrefix(-1));
+
+  Interest interest3("/interest3");
+  keyChain.sign(interest3);
+  BOOST_CHECK(Validator::verifySignature(interest3, idCert->getPublicKeyInfo()));
+  SignatureInfo sigInfo3(interest1.getName()[-2].blockFromValue());
+  BOOST_CHECK_EQUAL(sigInfo3.getKeyLocator().getName(), certName.getPrefix(-1));
+
+  // SigningInfo is set to Cert
+  Data data4("/data4");
+  keyChain.sign(data4, SigningInfo(SigningInfo::SIGNER_TYPE_CERT, certName));
+  BOOST_CHECK(Validator::verifySignature(data4, idCert->getPublicKeyInfo()));
+  BOOST_CHECK_EQUAL(data4.getSignature().getKeyLocator().getName(), certName.getPrefix(-1));
+
+  Interest interest4("/interest4");
+  keyChain.sign(interest4, SigningInfo(SigningInfo::SIGNER_TYPE_CERT, certName));
+  BOOST_CHECK(Validator::verifySignature(interest4, idCert->getPublicKeyInfo()));
+  SignatureInfo sigInfo4(interest4.getName()[-2].blockFromValue());
+  BOOST_CHECK_EQUAL(sigInfo4.getKeyLocator().getName(), certName.getPrefix(-1));
+
+
+  // SigningInfo is set to DigestSha256
+  Data data5("/data5");
+  keyChain.sign(data5, SigningInfo(SigningInfo::SIGNER_TYPE_SHA256));
+  BOOST_CHECK(Validator::verifySignature(data5, DigestSha256(data5.getSignature())));
+
+  Interest interest5("/interest4");
+  keyChain.sign(interest5, SigningInfo(SigningInfo::SIGNER_TYPE_SHA256));
+  BOOST_CHECK(Validator::verifySignature(interest5,
+                                         DigestSha256(Signature(interest5.getName()[-2].blockFromValue(),
+                                                                interest5.getName()[-1].blockFromValue()))));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 } // namespace tests
+} // namespace security
 } // namespace ndn
diff --git a/tests/unit-tests/security/sec-rule-relative.t.cpp b/tests/unit-tests/security/sec-rule-relative.t.cpp
index f2f92e6a5..8557cc9 100644
--- a/tests/unit-tests/security/sec-rule-relative.t.cpp
+++ b/tests/unit-tests/security/sec-rule-relative.t.cpp
@@ -37,11 +37,15 @@
 
   Name dataName("SecurityTestSecRule/Basic");
   Data rsaData(dataName);
-  m_keyChain.signByIdentity(rsaData, rsaIdentity);
+  m_keyChain.sign(rsaData,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   Data ecdsaData(dataName);
-  m_keyChain.signByIdentity(ecdsaData, ecdsaIdentity);
+  m_keyChain.sign(ecdsaData,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
   Data sha256Data(dataName);
-  m_keyChain.signWithSha256(sha256Data);
+  m_keyChain.sign(sha256Data, security::SigningInfo(security::SigningInfo::SIGNER_TYPE_SHA256));
 
   SecRuleRelative rule("^(<SecurityTestSecRule><Basic>)$",
                        "^(<SecurityTestSecRule><Basic>)<><KEY><><>$",
diff --git a/tests/unit-tests/security/sec-rule-specific.t.cpp b/tests/unit-tests/security/sec-rule-specific.t.cpp
index 3c48265..602a080 100644
--- a/tests/unit-tests/security/sec-rule-specific.t.cpp
+++ b/tests/unit-tests/security/sec-rule-specific.t.cpp
@@ -40,11 +40,15 @@
 
   Name dataName("SecurityTestSecRule/Basic");
   Data rsaData(dataName);
-  m_keyChain.signByIdentity(rsaData, rsaIdentity);
+  m_keyChain.sign(rsaData,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   Data ecdsaData(dataName);
-  m_keyChain.signByIdentity(ecdsaData, ecdsaIdentity);
+  m_keyChain.sign(ecdsaData,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
   Data sha256Data(dataName);
-  m_keyChain.signWithSha256(sha256Data);
+  m_keyChain.sign(sha256Data, security::SigningInfo(security::SigningInfo::SIGNER_TYPE_SHA256));
 
   shared_ptr<Regex> dataRegex =
     make_shared<Regex>("^<SecurityTestSecRule><Basic>$");
diff --git a/tests/unit-tests/security/signature-sha256-with-ecdsa.t.cpp b/tests/unit-tests/security/signature-sha256-with-ecdsa.t.cpp
index 22b324a..2df573b 100644
--- a/tests/unit-tests/security/signature-sha256-with-ecdsa.t.cpp
+++ b/tests/unit-tests/security/signature-sha256-with-ecdsa.t.cpp
@@ -114,7 +114,9 @@
   Data testData("/SecurityTestSignatureSha256WithEcdsa/DataSignature/Data1");
   char content[5] = "1234";
   testData.setContent(reinterpret_cast<uint8_t*>(content), 5);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(testData, identityName));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(testData,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identityName)));
   Block dataBlock(testData.wireEncode().wire(), testData.wireEncode().size());
 
   Data testData2;
@@ -136,12 +138,16 @@
   Interest interest11("/SecurityTestSignatureSha256WithEcdsa/InterestSignature/Interest1");
 
   scheduler.scheduleEvent(time::milliseconds(100), [&] {
-      BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest, identityName));
+      BOOST_CHECK_NO_THROW(m_keyChain.sign(interest,
+                                           security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                                 identityName)));
     });
 
   advanceClocks(time::milliseconds(100));
   scheduler.scheduleEvent(time::milliseconds(100), [&] {
-      BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest11, identityName));
+      BOOST_CHECK_NO_THROW(m_keyChain.sign(interest11,
+                                           security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                                 identityName)));
     });
 
   advanceClocks(time::milliseconds(100));
diff --git a/tests/unit-tests/security/signature-sha256-with-rsa.t.cpp b/tests/unit-tests/security/signature-sha256-with-rsa.t.cpp
index 0eb39f4..5c6f87d 100644
--- a/tests/unit-tests/security/signature-sha256-with-rsa.t.cpp
+++ b/tests/unit-tests/security/signature-sha256-with-rsa.t.cpp
@@ -119,7 +119,9 @@
   Data testData("/SecurityTestSignatureSha256WithRsa/DataSignature/Data1");
   char content[5] = "1234";
   testData.setContent(reinterpret_cast<uint8_t*>(content), 5);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(testData, identityName));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(testData,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identityName)));
   Block dataBlock(testData.wireEncode().wire(), testData.wireEncode().size());
 
   Data testData2;
@@ -139,12 +141,16 @@
   Interest interest11("/SecurityTestSignatureSha256WithRsa/InterestSignature/Interest1");
 
   scheduler.scheduleEvent(time::milliseconds(100), [&] {
-      BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest, identityName));
+      BOOST_CHECK_NO_THROW(m_keyChain.sign(interest,
+                                           security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                                 identityName)));
     });
 
   advanceClocks(time::milliseconds(100));
   scheduler.scheduleEvent(time::milliseconds(100), [&] {
-      BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest11, identityName));
+      BOOST_CHECK_NO_THROW(m_keyChain.sign(interest11,
+                                           security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                                 identityName)));
     });
 
   advanceClocks(time::milliseconds(100));
diff --git a/tests/unit-tests/security/signing-info.t.cpp b/tests/unit-tests/security/signing-info.t.cpp
new file mode 100644
index 0000000..d3311be
--- /dev/null
+++ b/tests/unit-tests/security/signing-info.t.cpp
@@ -0,0 +1,100 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library 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 Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "security/signing-info.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace security {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(SecuritySigningInfo)
+
+BOOST_AUTO_TEST_CASE(Basic)
+{
+  Name id("/id");
+  Name key("/key");
+  Name cert("/cert");
+
+  SigningInfo info;
+
+  BOOST_CHECK_EQUAL(info.getSignerType(), SigningInfo::SIGNER_TYPE_NULL);
+  BOOST_CHECK_EQUAL(info.getSignerName(), SigningInfo::EMPTY_NAME);
+  BOOST_CHECK_EQUAL(info.getDigestAlgorithm(), DIGEST_ALGORITHM_SHA256);
+
+  const SignatureInfo& sigInfo = info.getSignatureInfo();
+  BOOST_CHECK_EQUAL(sigInfo.getSignatureType(), -1);
+  BOOST_CHECK_EQUAL(sigInfo.hasKeyLocator(), false);
+
+  info.setSigningIdentity(id);
+  BOOST_CHECK_EQUAL(info.getSignerType(), SigningInfo::SIGNER_TYPE_ID);
+  BOOST_CHECK_EQUAL(info.getSignerName(), id);
+
+  SigningInfo infoId(SigningInfo::SIGNER_TYPE_ID, id);
+  BOOST_CHECK_EQUAL(infoId.getSignerType(), SigningInfo::SIGNER_TYPE_ID);
+  BOOST_CHECK_EQUAL(infoId.getSignerName(), id);
+
+  info.setSigningKeyName(key);
+  BOOST_CHECK_EQUAL(info.getSignerType(), SigningInfo::SIGNER_TYPE_KEY);
+  BOOST_CHECK_EQUAL(info.getSignerName(), key);
+
+  SigningInfo infoKey(SigningInfo::SIGNER_TYPE_KEY, key);
+  BOOST_CHECK_EQUAL(infoKey.getSignerType(), SigningInfo::SIGNER_TYPE_KEY);
+  BOOST_CHECK_EQUAL(infoKey.getSignerName(), key);
+
+  info.setSigningCertName(cert);
+  BOOST_CHECK_EQUAL(info.getSignerType(), SigningInfo::SIGNER_TYPE_CERT);
+  BOOST_CHECK_EQUAL(info.getSignerName(), cert);
+
+  SigningInfo infoCert(SigningInfo::SIGNER_TYPE_CERT, cert);
+  BOOST_CHECK_EQUAL(infoCert.getSignerType(), SigningInfo::SIGNER_TYPE_CERT);
+  BOOST_CHECK_EQUAL(infoCert.getSignerName(), cert);
+
+  info.setSha256Signing();
+  BOOST_CHECK_EQUAL(info.getSignerType(), SigningInfo::SIGNER_TYPE_SHA256);
+  BOOST_CHECK_EQUAL(info.getSignerName(), SigningInfo::EMPTY_NAME);
+
+  SigningInfo infoSha(SigningInfo::SIGNER_TYPE_SHA256);
+  BOOST_CHECK_EQUAL(infoSha.getSignerType(), SigningInfo::SIGNER_TYPE_SHA256);
+  BOOST_CHECK_EQUAL(infoSha.getSignerName(), SigningInfo::EMPTY_NAME);
+}
+
+BOOST_AUTO_TEST_CASE(CustomSignatureInfo)
+{
+  SigningInfo info1;
+  BOOST_CHECK(info1.getSignatureInfo() == SignatureInfo());
+
+  SignatureInfo si;
+  si.setKeyLocator(Name("ndn:/test/key/locator"));
+  info1.setSignatureInfo(si);
+
+  BOOST_CHECK(info1.getSignatureInfo() == si);
+
+  SigningInfo info2(SigningInfo::SIGNER_TYPE_NULL, SigningInfo::EMPTY_NAME, si);
+  BOOST_CHECK(info2.getSignatureInfo() == si);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace security
+} // namespace ndn
diff --git a/tests/unit-tests/security/validator-config.t.cpp b/tests/unit-tests/security/validator-config.t.cpp
index 4171554..63eee74 100644
--- a/tests/unit-tests/security/validator-config.t.cpp
+++ b/tests/unit-tests/security/validator-config.t.cpp
@@ -50,11 +50,15 @@
 
   Name dataName1("/simple/equal");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName2("/simple/different");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   std::string CONFIG_1 =
     "rule\n"
@@ -121,15 +125,21 @@
 
   Name dataName1("/simple/isPrefixOf");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName2("/simple/notPrefixOf");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName3("/simple/isPrefixOf/anotherLevel");
   shared_ptr<Data> data3 = make_shared<Data>(dataName3);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data3, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   std::string CONFIG_1 =
     "rule\n"
@@ -200,15 +210,21 @@
 
   Name dataName1("/simple/isStrictPrefixOf");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName2("/simple");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName3("/simple/isStrictPrefixOf/anotherLevel");
   shared_ptr<Data> data3 = make_shared<Data>(dataName3);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data3, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   std::string CONFIG_1 =
     "rule\n"
@@ -279,15 +295,21 @@
 
   Name dataName1("/simple/regex");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName2("/simple/regex-wrong");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName3("/simple/regex/correct");
   shared_ptr<Data> data3 = make_shared<Data>(dataName3);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data3, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   std::string CONFIG_1 =
     "rule\n"
@@ -358,15 +380,21 @@
   Name dataName1 = identity;
   dataName1.append("1");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName2 = identity;
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   Name dataName3("/TestValidatorConfig/KeyLocatorNameChecker1");
   shared_ptr<Data> data3 = make_shared<Data>(dataName3);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data3, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   const std::string CONFIG =
     "rule\n"
@@ -439,12 +467,16 @@
   Name dataName1 = identity;
   dataName1.append("data").appendVersion();
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity1));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity1)));
 
   Name dataName2 = identity;
   dataName2.append("data").appendVersion();
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, identity2));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity2)));
 
   Name interestName("/TestValidatorConfig/FixedSignerChecker/fakeSigInfo/fakeSigValue");
   shared_ptr<Interest> interest = make_shared<Interest>(interestName);
@@ -593,7 +625,9 @@
 
   Name dataName1("/any/data");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   std::string CONFIG =
     "trust-anchor\n"
@@ -633,9 +667,13 @@
   interestName2.append("2");
   shared_ptr<Interest> interest2 = make_shared<Interest>(interestName2);
 
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest1, identity1));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity1)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest2, identity1));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity1)));
 
   const std::string CONFIG =
     "rule\n"
@@ -722,11 +760,17 @@
   interestName3.append("3");
   shared_ptr<Interest> interest3 = make_shared<Interest>(interestName3);
 
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest1, identity1));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity1)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest2, identity2));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity2)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest3, identity3));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity3)));
 
   const std::string CONFIG =
     "rule\n"
@@ -855,13 +899,21 @@
   shared_ptr<Interest> interest4 = make_shared<Interest>(interestName4);
 
 
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest1, identity1));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity1)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest2, identity2));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity2)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest3, identity3));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity3)));
   usleep(10000);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest4, identity4));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest4,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity4)));
 
   const std::string CONFIG =
     "rule\n"
@@ -989,14 +1041,22 @@
 
   Name dataName("/TestValidatorConfig/FixedSignerChecker2");
   shared_ptr<Data> dataRsa = make_shared<Data>(dataName);
-  m_keyChain.signByIdentity(*dataRsa, rsaIdentity);
+  m_keyChain.sign(*dataRsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   shared_ptr<Data> dataEcdsa = make_shared<Data>(dataName);
-  m_keyChain.signByIdentity(*dataEcdsa, ecdsaIdentity);
+  m_keyChain.sign(*dataEcdsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
 
   shared_ptr<Interest> interestRsa = make_shared<Interest>(dataName);
-  m_keyChain.signByIdentity(*interestRsa, rsaIdentity);
+  m_keyChain.sign(*interestRsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   shared_ptr<Interest> interestEcdsa = make_shared<Interest>(dataName);
-  m_keyChain.signByIdentity(*interestEcdsa, ecdsaIdentity);
+  m_keyChain.sign(*interestEcdsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
 
   const std::string CONFIG =
     "rule\n"
@@ -1145,7 +1205,9 @@
                                                   time::system_clock::now(),
                                                   time::system_clock::now() + time::days(7300),
                                                   subjectDescription);
-  m_keyChain.signByIdentity(*sldCert, root);
+  m_keyChain.sign(*sldCert,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        root));
   m_keyChain.addCertificateAsIdentityDefault(*sldCert);
 
   Name nld("/TestValidatorConfig/HierarchicalChecker/NextLevel");
@@ -1158,7 +1220,9 @@
                                                   time::system_clock::now(),
                                                   time::system_clock::now() + time::days(7300),
                                                   subjectDescription);
-  m_keyChain.signByIdentity(*nldCert, sld);
+  m_keyChain.sign(*nldCert,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        sld));
   m_keyChain.addCertificateAsIdentityDefault(*nldCert);
 
   face1->setInterestFilter(sldCert->getName().getPrefix(-1),
@@ -1174,12 +1238,16 @@
   Name dataName1 = nld;
   dataName1.append("data1");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, nld));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             nld)));
 
   Name dataName2("/ConfValidatorTest");
   dataName2.append("data1");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, nld));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             nld)));
 
 
   const std::string CONFIG =
@@ -1250,7 +1318,9 @@
                                                   time::system_clock::now(),
                                                   time::system_clock::now() + time::days(7300),
                                                   subjectDescription);
-  m_keyChain.signByIdentity(*sldCert, root);
+  m_keyChain.sign(*sldCert,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        root));
   m_keyChain.addCertificateAsIdentityDefault(*sldCert);
 
   Name nld("/TestValidatorConfig/Nrd-1/Nrd-2");
@@ -1263,7 +1333,9 @@
                                                   time::system_clock::now(),
                                                   time::system_clock::now() + time::days(7300),
                                                   subjectDescription);
-  m_keyChain.signByIdentity(*nldCert, sld);
+  m_keyChain.sign(*nldCert,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        sld));
   m_keyChain.addCertificateAsIdentityDefault(*nldCert);
 
   face1->setInterestFilter(sldCert->getName().getPrefix(-1),
@@ -1279,17 +1351,23 @@
   advanceClocks(time::milliseconds(10));
   Name interestName1("/localhost/nrd/register/option");
   shared_ptr<Interest> interest1 = make_shared<Interest>(interestName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest1, nld));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             nld)));
 
   advanceClocks(time::milliseconds(10));
   Name interestName2("/localhost/nrd/non-register");
   shared_ptr<Interest> interest2 = make_shared<Interest>(interestName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest2, nld));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             nld)));
 
   advanceClocks(time::milliseconds(10));
   Name interestName3("/localhost/nrd/register/option");
   shared_ptr<Interest> interest3 = make_shared<Interest>(interestName3);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*interest3, root));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*interest3,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             root)));
 
   advanceClocks(time::milliseconds(10));
   Name interestName4("/localhost/nrd/register/option/timestamp/nonce/fakeSigInfo/fakeSigValue");
@@ -1442,11 +1520,15 @@
 
   Name dataName1("/any/data/1");
   shared_ptr<Data> data1 = make_shared<Data>(dataName1);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data1, firstIdentity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data1,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             firstIdentity)));
 
   Name dataName2("/any/data/2");
   shared_ptr<Data> data2 = make_shared<Data>(dataName2);
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data2, secondIdentity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data2,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             secondIdentity)));
 
   std::string CONFIG =
     "rule\n"
diff --git a/tests/unit-tests/security/validator.t.cpp b/tests/unit-tests/security/validator.t.cpp
index e72171e..b91e5d3 100644
--- a/tests/unit-tests/security/validator.t.cpp
+++ b/tests/unit-tests/security/validator.t.cpp
@@ -54,7 +54,9 @@
   dataName.append("1");
   shared_ptr<Data> data = make_shared<Data>(dataName);
 
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(*data, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(*data,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
 
   ValidatorNull validator;
 
@@ -100,12 +102,16 @@
   shared_ptr<PublicKey> publicKey2 = m_keyChain.getPublicKey(keyName2);
 
   Data data("/TestData/1");
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(data, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(data,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
   BOOST_CHECK_EQUAL(Validator::verifySignature(data, *publicKey), true);
   BOOST_CHECK_EQUAL(Validator::verifySignature(data, *publicKey2), false);
 
   Interest interest("/TestInterest/1");
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(interest,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
   BOOST_CHECK_EQUAL(Validator::verifySignature(interest, *publicKey), true);
   BOOST_CHECK_EQUAL(Validator::verifySignature(interest, *publicKey2), false);
 
@@ -160,12 +166,16 @@
 
 
   Data data("/TestData/1");
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(data, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(data,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
   BOOST_CHECK_EQUAL(Validator::verifySignature(data, *publicKey), true);
   BOOST_CHECK_EQUAL(Validator::verifySignature(data, *publicKey2), false);
 
   Interest interest("/TestInterest/1");
-  BOOST_CHECK_NO_THROW(m_keyChain.signByIdentity(interest, identity));
+  BOOST_CHECK_NO_THROW(m_keyChain.sign(interest,
+                                       security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                                             identity)));
   BOOST_CHECK_EQUAL(Validator::verifySignature(interest, *publicKey), true);
   BOOST_CHECK_EQUAL(Validator::verifySignature(interest, *publicKey2), false);
 
@@ -192,13 +202,21 @@
   Name packetName("/Test/Packet/Name");
 
   shared_ptr<Data> testDataRsa = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*testDataRsa, rsaIdentity);
+  m_keyChain.sign(*testDataRsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   shared_ptr<Data> testDataEcdsa = make_shared<Data>(packetName);
-  m_keyChain.signByIdentity(*testDataEcdsa, ecdsaIdentity);
+  m_keyChain.sign(*testDataEcdsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
   shared_ptr<Interest> testInterestRsa = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*testInterestRsa, rsaIdentity);
+  m_keyChain.sign(*testInterestRsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        rsaIdentity));
   shared_ptr<Interest> testInterestEcdsa = make_shared<Interest>(packetName);
-  m_keyChain.signByIdentity(*testInterestEcdsa, ecdsaIdentity);
+  m_keyChain.sign(*testInterestEcdsa,
+                  security::SigningInfo(security::SigningInfo::SIGNER_TYPE_ID,
+                                        ecdsaIdentity));
 
   BOOST_CHECK(Validator::verifySignature(*ecdsaCert, ecdsaCert->getPublicKeyInfo()));
   BOOST_CHECK_EQUAL(Validator::verifySignature(*ecdsaCert, rsaCert->getPublicKeyInfo()), false);