Adding EncryptedContent class, for group-based encryption protocol

Change-Id: I661e110db8ca91420359d070c1bb74464117b8d9
diff --git a/tests/unit-tests/encrypted-content.t.cpp b/tests/unit-tests/encrypted-content.t.cpp
new file mode 100644
index 0000000..e53b3f1
--- /dev/null
+++ b/tests/unit-tests/encrypted-content.t.cpp
@@ -0,0 +1,216 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California
+ *
+ * This file is part of ndn-group-encrypt (Group-based Encryption Protocol for NDN).
+ * See AUTHORS.md for complete list of ndn-group-encrypt authors and contributors.
+ *
+ * ndn-group-encrypt 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.
+ *
+ * ndn-group-encrypt 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
+ * ndn-group-encrypt, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "encrypted-content.hpp"
+
+#include "boost-test.hpp"
+#include <algorithm>
+
+namespace ndn {
+namespace gep {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(TestEncryptedContent)
+
+const uint8_t encrypted[] = {
+0x82, 0x24, // EncryptedContent
+  0x1c, 0x16, // KeyLocator
+    0x07, 0x14, // Name
+      0x08, 0x04,
+        0x74, 0x65, 0x73, 0x74, // 'test'
+      0x08, 0x03,
+        0x6b, 0x65, 0x79, // 'key'
+      0x08, 0x07,
+        0x6c, 0x6f, 0x63, 0x61, 0x74, 0x6f, 0x72, // 'locator'
+  0x83, 0x01, // EncryptedAlgorithm
+    0x00,
+  0x84, 0x07, // EncryptedPayload
+    0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+};
+
+const uint8_t message[] = {
+  0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+};
+
+BOOST_AUTO_TEST_CASE(Constructor)
+{
+  EncryptedContent content;
+  BOOST_CHECK_EQUAL(content.getAlgorithmType(), -1);
+  BOOST_CHECK_EQUAL(content.getPayload() == nullptr, true);
+  BOOST_CHECK_EQUAL(content.hasKeyLocator(), false);
+  BOOST_CHECK_THROW(content.getKeyLocator(), EncryptedContent::Error);
+
+  ConstBufferPtr payload = make_shared<Buffer>(message, sizeof(message));
+  KeyLocator keyLocator("test/key/locator");
+  EncryptedContent sha256RsaContent(tlv::AlgorithmSha256WithRsa, keyLocator, payload);
+  ConstBufferPtr contentPayload = sha256RsaContent.getPayload();
+
+  BOOST_CHECK_EQUAL(sha256RsaContent.getAlgorithmType(), tlv::AlgorithmSha256WithRsa);
+  BOOST_CHECK_EQUAL_COLLECTIONS(contentPayload->begin(),
+                                contentPayload->end(),
+                                payload->begin(),
+                                payload->end());
+  BOOST_CHECK_EQUAL(sha256RsaContent.hasKeyLocator(), true);
+  BOOST_CHECK_NO_THROW(sha256RsaContent.getKeyLocator());
+  BOOST_CHECK_EQUAL(sha256RsaContent.getKeyLocator().getName(), Name("test/key/locator"));
+
+  Block encryptedBlock(encrypted, sizeof(encrypted));
+  const Block& encoded = sha256RsaContent.wireEncode();
+
+  BOOST_CHECK_EQUAL_COLLECTIONS(encryptedBlock.wire(),
+                                encryptedBlock.wire() + encryptedBlock.size(),
+                                encoded.wire(),
+                                encoded.wire() + encoded.size());
+
+  sha256RsaContent = EncryptedContent(encryptedBlock);
+  contentPayload = sha256RsaContent.getPayload();
+
+  BOOST_CHECK_EQUAL(sha256RsaContent.getAlgorithmType(), tlv::AlgorithmSha256WithRsa);
+  BOOST_CHECK_EQUAL(sha256RsaContent.hasKeyLocator(), true);
+  BOOST_CHECK_EQUAL_COLLECTIONS(contentPayload->begin(),
+                                contentPayload->end(),
+                                payload->begin(),
+                                payload->end());
+  BOOST_CHECK_NO_THROW(sha256RsaContent.getKeyLocator());
+  BOOST_CHECK_EQUAL(sha256RsaContent.getKeyLocator().getName(), Name("test/key/locator"));
+}
+
+BOOST_AUTO_TEST_CASE(ConstructorError)
+{
+  const uint8_t error1[] = {
+    0x1f, 0x24, // Wrong EncryptedContent (0x82, 0x24)
+      0x1c, 0x16, // KeyLocator
+        0x07, 0x14, // Name
+          0x08, 0x04,
+            0x74, 0x65, 0x73, 0x74,
+          0x08, 0x03,
+            0x6b, 0x65, 0x79,
+          0x08, 0x07,
+            0x6c, 0x6f, 0x63, 0x61, 0x74, 0x6f, 0x72,
+      0x83, 0x01, // EncryptedAlgorithm
+        0x00,
+      0x84, 0x07, // EncryptedPayload
+        0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+  };
+  Block errorBlock1(error1, sizeof(error1));
+  BOOST_CHECK_THROW(EncryptedContent info(errorBlock1), EncryptedContent::Error);
+
+  const uint8_t error2[] = {
+    0x82, 0x24, // EncryptedContent
+      0x1d, 0x16, // Wrong KeyLocator (0x1c, 0x16)
+        0x07, 0x14, // Name
+          0x08, 0x04,
+            0x74, 0x65, 0x73, 0x74,
+          0x08, 0x03,
+            0x6b, 0x65, 0x79,
+          0x08, 0x07,
+            0x6c, 0x6f, 0x63, 0x61, 0x74, 0x6f, 0x72,
+      0x83, 0x01, // EncryptedAlgorithm
+        0x00,
+      0x84, 0x07, // EncryptedPayload
+        0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+  };
+  Block errorBlock2(error2, sizeof(error2));
+  BOOST_CHECK_THROW(EncryptedContent info(errorBlock2), EncryptedContent::Error);
+
+  const uint8_t error3[] = {
+    0x82, 0x24, // EncryptedContent
+      0x1c, 0x16, // KeyLocator
+        0x07, 0x14, // Name
+          0x08, 0x04,
+            0x74, 0x65, 0x73, 0x74,
+          0x08, 0x03,
+            0x6b, 0x65, 0x79,
+          0x08, 0x07,
+            0x6c, 0x6f, 0x63, 0x61, 0x74, 0x6f, 0x72,
+      0x1d, 0x01, // Wrong EncryptedAlgorithm (0x83, 0x01)
+        0x00,
+      0x84, 0x07, // EncryptedPayload
+        0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+  };
+  Block errorBlock3(error3, sizeof(error3));
+  BOOST_CHECK_THROW(EncryptedContent info(errorBlock3), EncryptedContent::Error);
+
+  const uint8_t error4[] = {
+    0x82, 0x24, // EncryptedContent
+      0x1c, 0x16, // KeyLocator
+        0x07, 0x14, // Name
+          0x08, 0x04,
+            0x74, 0x65, 0x73, 0x74, // 'test'
+          0x08, 0x03,
+            0x6b, 0x65, 0x79, // 'key'
+          0x08, 0x07,
+            0x6c, 0x6f, 0x63, 0x61, 0x74, 0x6f, 0x72, // 'locator'
+      0x83, 0x01, // EncryptedAlgorithm
+        0x00,
+      0x21, 0x07, // EncryptedPayload (0x84, 0x07)
+        0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74
+  };
+  Block errorBlock4(error4, sizeof(error4));
+  BOOST_CHECK_THROW(EncryptedContent info(errorBlock4), EncryptedContent::Error);
+
+  const uint8_t error5[] = {
+    0x82, 0x00 // Empty EncryptedContent
+  };
+  Block errorBlock5(error5, sizeof(error5));
+  BOOST_CHECK_THROW(EncryptedContent info(errorBlock5), EncryptedContent::Error);
+}
+
+BOOST_AUTO_TEST_CASE(SetterGetter)
+{
+  EncryptedContent content;
+  BOOST_CHECK_EQUAL(content.getAlgorithmType(), -1);
+  BOOST_CHECK_EQUAL(content.getPayload() == nullptr, true);
+  BOOST_CHECK_EQUAL(content.hasKeyLocator(), false);
+  BOOST_CHECK_THROW(content.getKeyLocator(), EncryptedContent::Error);
+
+  content.setAlgorithmType(tlv::AlgorithmSha256WithRsa);
+  BOOST_CHECK_EQUAL(content.getAlgorithmType(), tlv::AlgorithmSha256WithRsa);
+  BOOST_CHECK_EQUAL(content.getPayload() == nullptr, true);
+  BOOST_CHECK_EQUAL(content.hasKeyLocator(), false);
+
+  KeyLocator keyLocator("/test/key/locator");
+  content.setKeyLocator(keyLocator);
+  BOOST_CHECK_EQUAL(content.hasKeyLocator(), true);
+  BOOST_CHECK_NO_THROW(content.getKeyLocator());
+  BOOST_CHECK_EQUAL(content.getKeyLocator().getName(), Name("/test/key/locator"));
+  BOOST_CHECK_EQUAL(content.getPayload() == nullptr, true);
+
+  ConstBufferPtr payload = make_shared<Buffer>(message, sizeof(message));
+  content.setPayload(payload);
+
+  ConstBufferPtr contentPayload = content.getPayload();
+  BOOST_CHECK_EQUAL_COLLECTIONS(contentPayload->begin(),
+                                contentPayload->end(),
+                                payload->begin(),
+                                payload->end());
+
+  const Block& encoded = content.wireEncode();
+  Block contentBlock(encrypted, sizeof(encrypted));
+
+  BOOST_CHECK_EQUAL_COLLECTIONS(contentBlock.wire(),
+                                contentBlock.wire() + contentBlock.size(),
+                                encoded.wire(),
+                                encoded.wire() + encoded.size());
+}
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace gep
+} // namespace ndn