util: rename digest.hpp to sha256.hpp

The new file name matches the Sha256 class included within.

This commit also deletes deprecated crypto.hpp.

refs #3940

Change-Id: Ib9bbcd0ba087b812bb0886ceaea116689d4633f5
diff --git a/tests/unit-tests/util/sha256.t.cpp b/tests/unit-tests/util/sha256.t.cpp
new file mode 100644
index 0000000..6e42201
--- /dev/null
+++ b/tests/unit-tests/util/sha256.t.cpp
@@ -0,0 +1,212 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2013-2017 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 "util/sha256.hpp"
+#include "util/string-helper.hpp"
+#include "encoding/endian.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace util {
+namespace test {
+
+BOOST_AUTO_TEST_SUITE(Util)
+BOOST_AUTO_TEST_SUITE(TestSha256)
+
+BOOST_AUTO_TEST_CASE(Basic)
+{
+  const uint8_t input[] = {0x01, 0x02, 0x03, 0x04};
+  auto expected = fromHex("9f64a747e1b97f131fabb6b447296c9b6f0201e79fb3c5356e6c77e89b6a806a");
+
+  Sha256 statefulSha256;
+  BOOST_CHECK_EQUAL(statefulSha256.empty(), true);
+
+  statefulSha256.update(input, 1);
+  statefulSha256.update(input + 1, 1);
+  statefulSha256.update(input + 2, 1);
+  statefulSha256.update(input + 3, 1);
+  ConstBufferPtr digest = statefulSha256.computeDigest();
+  BOOST_CHECK_EQUAL(digest->size(), Sha256::DIGEST_SIZE);
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(ConstructFromStream)
+{
+  const std::string input = "Hello, world!";
+  auto expected = fromHex("315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3");
+
+  std::istringstream is(input);
+  Sha256 sha(is);
+  BOOST_CHECK_EQUAL(sha.empty(), false);
+  BOOST_CHECK_EQUAL(sha.toString(), "315F5BDB76D078C43B8AC0064E4A0164612B1FCE77C869345BFC94C75894EDD3");
+
+  ConstBufferPtr digest = sha.computeDigest();
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(Compare)
+{
+  const uint8_t origin[] = {0x01, 0x02, 0x03, 0x04};
+
+  Sha256 digest1;
+  digest1.update(origin, sizeof(origin));
+  digest1.computeDigest();
+
+  Sha256 digest2;
+  digest2.update(origin, 1);
+  digest2.update(origin + 1, 1);
+  digest2.update(origin + 2, 1);
+  digest2.update(origin + 3, 1);
+  digest2.computeDigest();
+
+  BOOST_CHECK_EQUAL(digest1 == digest2, true);
+  BOOST_CHECK_EQUAL(digest1 != digest2, false);
+}
+
+BOOST_AUTO_TEST_CASE(InsertionOperatorSha256)
+{
+  auto expected = fromHex("d7bd34bfe44a18d2aa755a344fe3e6b06ed0473772e6dfce16ac71ba0b0a241c");
+
+  Sha256 innerDigest;
+  innerDigest << "TEST";
+
+  Sha256 statefulSha256;
+  statefulSha256 << innerDigest;
+  ConstBufferPtr digest = statefulSha256.computeDigest();
+
+  BOOST_CHECK_EQUAL(statefulSha256.empty(), false);
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(InsertionOperatorString)
+{
+  const std::string input = "Hello, world!";
+  auto expected = fromHex("315f5bdb76d078c43b8ac0064e4a0164612b1fce77c869345bfc94c75894edd3");
+
+  Sha256 statefulSha256;
+  statefulSha256 << input;
+  ConstBufferPtr digest = statefulSha256.computeDigest();
+
+  BOOST_CHECK_EQUAL(statefulSha256.empty(), false);
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(InsertionOperatorBlock)
+{
+  const uint8_t input[] = {
+    0x16, 0x1b, // SignatureInfo
+      0x1b, 0x01, // SignatureType
+        0x01, // Sha256WithRsa
+      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
+  };
+  auto expected = fromHex("b372edfd4d6a4db2cfeaeead6c34fdee9b9e759f7b8d799cf8067e39e7f2886c");
+
+  Sha256 statefulSha256;
+  statefulSha256 << Block{input, sizeof(input)};
+  ConstBufferPtr digest = statefulSha256.computeDigest();
+
+  BOOST_CHECK_EQUAL(statefulSha256.empty(), false);
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(InsertionOperatorUint64t)
+{
+  const uint64_t input[] = {1, 2, 3, 4};
+  auto expected = fromHex("7236c00c170036c6de133a878210ddd58567aa1d0619a0f70f69e38ae6f916e9");
+
+  Sha256 statefulSha256;
+  for (size_t i = 0; i < sizeof(input) / sizeof(uint64_t); ++i) {
+    statefulSha256 << htobe64(input[i]);
+  }
+  ConstBufferPtr digest = statefulSha256.computeDigest();
+
+  BOOST_CHECK_EQUAL(statefulSha256.empty(), false);
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(Reset)
+{
+  Sha256 sha;
+  BOOST_CHECK_EQUAL(sha.empty(), true);
+
+  sha << 42;
+  BOOST_CHECK_EQUAL(sha.empty(), false);
+
+  sha.computeDigest(); // finalize
+  sha.reset();
+  BOOST_CHECK_EQUAL(sha.empty(), true);
+  BOOST_CHECK_NO_THROW(sha << 42);
+}
+
+BOOST_AUTO_TEST_CASE(Error)
+{
+  Sha256 sha;
+  sha << 42;
+  sha.computeDigest(); // finalize
+  BOOST_CHECK_THROW(sha << 42, Sha256::Error);
+}
+
+BOOST_AUTO_TEST_CASE(StaticComputeDigest)
+{
+  const uint8_t input[] = {0x01, 0x02, 0x03, 0x04};
+  auto expected = fromHex("9f64a747e1b97f131fabb6b447296c9b6f0201e79fb3c5356e6c77e89b6a806a");
+
+  ConstBufferPtr digest = Sha256::computeDigest(input, sizeof(input));
+  BOOST_CHECK_EQUAL_COLLECTIONS(expected->buf(), expected->buf() + expected->size(),
+                                digest->buf(), digest->buf() + digest->size());
+}
+
+BOOST_AUTO_TEST_CASE(Print)
+{
+  const uint8_t origin[] = {0x94, 0xEE, 0x05, 0x93, 0x35, 0xE5, 0x87, 0xE5,
+                            0x01, 0xCC, 0x4B, 0xF9, 0x06, 0x13, 0xE0, 0x81,
+                            0x4F, 0x00, 0xA7, 0xB0, 0x8B, 0xC7, 0xC6, 0x48,
+                            0xFD, 0x86, 0x5A, 0x2A, 0xF6, 0xA2, 0x2C, 0xC2};
+  std::string expected = toHex(origin, sizeof(origin));
+
+  Sha256 digest;
+  digest << "TEST";
+  std::ostringstream os;
+  os << digest;
+  BOOST_CHECK_EQUAL(os.str(), expected);
+  BOOST_CHECK_EQUAL(digest.toString(), expected);
+}
+
+BOOST_AUTO_TEST_SUITE_END() // TestSha256
+BOOST_AUTO_TEST_SUITE_END() // Util
+
+} // namespace test
+} // namespace util
+} // namespace ndn