From d1450169fbddaa567f2fb50d4ed870a060875dc9 Mon Sep 17 00:00:00 2001
From: David Hook <dgh@cryptoworkshop.com>
Date: Mon, 22 Feb 2021 13:18:52 +1100
Subject: [PATCH] early JVM compatibility, minor refactoring

---
 .../bouncycastle/crypto/digests/Kangaroo.java  | 18 +++++++++---------
 .../crypto/test/RegressionTest.java            |  3 ++-
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/core/src/main/java/org/bouncycastle/crypto/digests/Kangaroo.java b/core/src/main/java/org/bouncycastle/crypto/digests/Kangaroo.java
index f9d5610e1a..adf68c342d 100644
--- a/core/src/main/java/org/bouncycastle/crypto/digests/Kangaroo.java
+++ b/core/src/main/java/org/bouncycastle/crypto/digests/Kangaroo.java
@@ -1,16 +1,16 @@
 package org.bouncycastle.crypto.digests;
 
 import org.bouncycastle.crypto.CipherParameters;
-import org.bouncycastle.crypto.Digest;
+import org.bouncycastle.crypto.ExtendedDigest;
 import org.bouncycastle.crypto.Xof;
 import org.bouncycastle.util.Arrays;
+import org.bouncycastle.util.Bytes;
 import org.bouncycastle.util.Pack;
 
 /**
  * Kangaroo.
  */
-public abstract class Kangaroo
-        implements Digest
+public final class Kangaroo
 {
     /**
      * Default digest length.
@@ -42,7 +42,7 @@ public KangarooTwelve(final int pLength)
 
         public String getAlgorithmName()
         {
-            return getClass().getSimpleName();
+            return "KangarooTwelve";
         }
     }
 
@@ -71,7 +71,7 @@ public MarsupilamiFourteen(final int pLength)
 
         public String getAlgorithmName()
         {
-            return getClass().getSimpleName();
+            return "MarsupilamiFourteen";
         }
     }
 
@@ -171,8 +171,8 @@ public KangarooParameters build()
     /**
      * The Kangaroo Base.
      */
-    public abstract static class KangarooBase
-            implements Digest, Xof
+    abstract static class KangarooBase
+            implements ExtendedDigest, Xof
     {
         /**
          * Block Size.
@@ -561,7 +561,7 @@ private static byte[] lengthEncode(final long strLen)
             if (v != 0)
             {
                 n = 1;
-                while ((v >>= Byte.SIZE) != 0)
+                while ((v >>= Bytes.SIZE) != 0)
                 {
                     n++;
                 }
@@ -574,7 +574,7 @@ private static byte[] lengthEncode(final long strLen)
             /* Encode the length */
             for (int i = 0; i < n; i++)
             {
-                b[i] = (byte) (strLen >> (Byte.SIZE * (n - i - 1)));
+                b[i] = (byte) (strLen >> (Bytes.SIZE * (n - i - 1)));
             }
 
             /* Return the encoded length */
diff --git a/core/src/test/java/org/bouncycastle/crypto/test/RegressionTest.java b/core/src/test/java/org/bouncycastle/crypto/test/RegressionTest.java
index e34b8d6645..8e5176fba4 100644
--- a/core/src/test/java/org/bouncycastle/crypto/test/RegressionTest.java
+++ b/core/src/test/java/org/bouncycastle/crypto/test/RegressionTest.java
@@ -177,7 +177,8 @@ public class RegressionTest
             new KMACTest(),
             new SipHash128Test(),
             new GCMSIVTest(),
-            new Blake3Test()
+            new Blake3Test(),
+            new KangarooTest()
         };
 
     public static void main(String[] args)