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/data.t.cpp b/tests/unit-tests/data.t.cpp
index e38cd98..48f4f82 100644
--- a/tests/unit-tests/data.t.cpp
+++ b/tests/unit-tests/data.t.cpp
@@ -27,7 +27,7 @@
 #include "security/transform/step-source.hpp"
 #include "security/transform/stream-sink.hpp"
 #include "security/verification-helpers.hpp"
-#include "util/digest.hpp"
+#include "util/sha256.hpp"
 
 #include "boost-test.hpp"
 #include "identity-management-fixture.hpp"
diff --git a/tests/unit-tests/exclude.t.cpp b/tests/unit-tests/exclude.t.cpp
index a6823c6..715f747 100644
--- a/tests/unit-tests/exclude.t.cpp
+++ b/tests/unit-tests/exclude.t.cpp
@@ -20,7 +20,7 @@
  */
 
 #include "exclude.hpp"
-#include "util/digest.hpp"
+#include "util/sha256.hpp"
 
 #include "boost-test.hpp"
 
diff --git a/tests/unit-tests/ims/in-memory-storage.t.cpp b/tests/unit-tests/ims/in-memory-storage.t.cpp
index 691321a..41082c6 100644
--- a/tests/unit-tests/ims/in-memory-storage.t.cpp
+++ b/tests/unit-tests/ims/in-memory-storage.t.cpp
@@ -25,7 +25,7 @@
 #include "ims/in-memory-storage-lru.hpp"
 #include "ims/in-memory-storage-persistent.hpp"
 #include "security/signature-sha256-with-rsa.hpp"
-#include "util/digest.hpp"
+#include "util/sha256.hpp"
 
 #include "boost-test.hpp"
 #include "../make-interest-data.hpp"
diff --git a/tests/unit-tests/security/digest-sha256.t.cpp b/tests/unit-tests/security/digest-sha256.t.cpp
index 6facb98..d49b5b4 100644
--- a/tests/unit-tests/security/digest-sha256.t.cpp
+++ b/tests/unit-tests/security/digest-sha256.t.cpp
@@ -21,7 +21,7 @@
 
 #include "security/digest-sha256.hpp"
 #include "security/validator.hpp"
-#include "util/digest.hpp"
+#include "util/sha256.hpp"
 #include "util/string-helper.hpp"
 
 #include "identity-management-fixture.hpp"
diff --git a/tests/unit-tests/util/digest.t.cpp b/tests/unit-tests/util/sha256.t.cpp
similarity index 99%
rename from tests/unit-tests/util/digest.t.cpp
rename to tests/unit-tests/util/sha256.t.cpp
index d8614c1..6e42201 100644
--- a/tests/unit-tests/util/digest.t.cpp
+++ b/tests/unit-tests/util/sha256.t.cpp
@@ -19,7 +19,7 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
-#include "util/digest.hpp"
+#include "util/sha256.hpp"
 #include "util/string-helper.hpp"
 #include "encoding/endian.hpp"