Add MD5 for reference

hashing/src/main/java/HashingTest.java

@@ -16,13 +16,16 @@ public static void main(String[] args) throws Exception {
 
         String password = "asfdsadfsadf3498hraisduf";
 
-        List<Hash> hashes = List.of(new Pbkdf2_SHA1_27K(), new Pbkdf2_SHA512_210K(), new SCrypt(), new BCrypt(), new Argon2_12MB(), new Argon2_7MB());
+        List<Hash> hashes = List.of(new Pbkdf2_SHA1_27K(), new Pbkdf2_SHA512_210K(), new SCrypt(), new BCrypt(), new Argon2_12MB(), new Argon2_7MB(), new MD5());
 
 
         System.out.println(String.format("%1$-25s", "Algorithm") +
                 String.format("%1$-12s", "Total (ms)") +
                 String.format("%1$-12s", "Per-hash (ms)"));
 
+        System.out.println("Processors: " + Runtime.getRuntime().availableProcessors());
+        System.out.println();
+
         for (Hash hash : hashes) {
             ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
             long start = System.currentTimeMillis();

hashing/src/main/java/MD5.java

@@ -0,0 +1,19 @@
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+
+public class MD5 implements Hash {
+
+    private static final int strength = 10;
+
+    @Override
+    public String hash(String key) {
+        try {
+            MessageDigest md5 = MessageDigest.getInstance("MD5");
+            md5.digest(key.getBytes(StandardCharsets.UTF_8));
+            byte[] result = md5.digest();
+            return new String(result, StandardCharsets.UTF_8);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+}