Fix hash function comparator

src/MessageDigest.cc

@@ -135,9 +135,12 @@ bool MessageDigest::isStronger(const std::string& lhs, const std::string& rhs)
                              FindHashTypeEntry(lhs));
   auto rEntry = std::find_if(std::begin(hashTypes), std::end(hashTypes),
                              FindHashTypeEntry(rhs));
-  if(lEntry == std::end(hashTypes) || rEntry == std::end(hashTypes)) {
+  if(lEntry == std::end(hashTypes)) {
     return false;
   }
+  if(rEntry == std::end(hashTypes)) {
+    return true;
+  }
   return lEntry->strength > rEntry->strength;
 }
 

test/MessageDigestTest.cc

@@ -76,7 +76,7 @@ void MessageDigestTest::testIsStronger()
   CPPUNIT_ASSERT(MessageDigest::isStronger("sha-1", "md5"));
   CPPUNIT_ASSERT(!MessageDigest::isStronger("md5", "sha-1"));
   CPPUNIT_ASSERT(!MessageDigest::isStronger("unknown", "sha-1"));
-  CPPUNIT_ASSERT(!MessageDigest::isStronger("sha-1", "unknown"));
+  CPPUNIT_ASSERT(MessageDigest::isStronger("sha-1", "unknown"));
 }
 
 void MessageDigestTest::testIsValidHash()