# HG changeset patch
# User Jaroslav Tulach <jtulach@netbeans.org>
# Date 1213429943 -7200
# Node ID 716af5f2ebd19a40371109c9ea0cce9d49218c36
# Parent  a161a4cdb5972dd3fba69f1dd450739d8268c39e
Switching to freeform project

diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/build.xml
--- a/samples/messagedigest/build.xml	Sat Jun 14 09:52:22 2008 +0200
+++ b/samples/messagedigest/build.xml	Sat Jun 14 09:52:23 2008 +0200
@@ -1,69 +1,80 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- You may freely edit this file. See commented blocks below for -->
-<!-- some examples of how to customize the build. -->
-<!-- (If you delete it and reopen the project it will be recreated.) -->
-<project name="messagedigest" default="default" basedir=".">
-    <description>Builds, tests, and runs the project messagedigest.</description>
-    <import file="nbproject/build-impl.xml"/>
-    <!--
-
-    There exist several targets which are by default empty and which can be 
-    used for execution of your tasks. These targets are usually executed 
-    before and after some main targets. They are: 
-
-      -pre-init:                 called before initialization of project properties
-      -post-init:                called after initialization of project properties
-      -pre-compile:              called before javac compilation
-      -post-compile:             called after javac compilation
-      -pre-compile-single:       called before javac compilation of single file
-      -post-compile-single:      called after javac compilation of single file
-      -pre-compile-test:         called before javac compilation of JUnit tests
-      -post-compile-test:        called after javac compilation of JUnit tests
-      -pre-compile-test-single:  called before javac compilation of single JUnit test
-      -post-compile-test-single: called after javac compilation of single JUunit test
-      -pre-jar:                  called before JAR building
-      -post-jar:                 called after JAR building
-      -post-clean:               called after cleaning build products
-
-    (Targets beginning with '-' are not intended to be called on their own.)
-
-    Example of inserting an obfuscator after compilation could look like this:
-
-        <target name="-post-compile">
-            <obfuscate>
-                <fileset dir="${build.classes.dir}"/>
-            </obfuscate>
-        </target>
-
-    For list of available properties check the imported 
-    nbproject/build-impl.xml file. 
-
-
-    Another way to customize the build is by overriding existing main targets.
-    The targets of interest are: 
-
-      -init-macrodef-javac:     defines macro for javac compilation
-      -init-macrodef-junit:     defines macro for junit execution
-      -init-macrodef-debug:     defines macro for class debugging
-      -init-macrodef-java:      defines macro for class execution
-      -do-jar-with-manifest:    JAR building (if you are using a manifest)
-      -do-jar-without-manifest: JAR building (if you are not using a manifest)
-      run:                      execution of project 
-      -javadoc-build:           Javadoc generation
-      test-report:              JUnit report generation
-
-    An example of overriding the target for project execution could look like this:
-
-        <target name="run" depends="messagedigest-impl.jar">
-            <exec dir="bin" executable="launcher.exe">
-                <arg file="${dist.jar}"/>
-            </exec>
-        </target>
-
-    Notice that the overridden target depends on the jar target and not only on 
-    the compile target as the regular run target does. Again, for a list of available 
-    properties which you can use, check the target you are overriding in the
-    nbproject/build-impl.xml file. 
-
-    -->
+<project name="Build Script" default="test" basedir=".">
+    <target name="clean">
+        <delete dir="build"/>
+    </target>
+    
+    <target name="build" depends="-libraries">
+        <antcall target="-build-one">
+            <param name="version" value="new-api"/>
+        </antcall>
+        <antcall target="-build-one">
+            <param name="version" value="new-spi"/>
+            <param name="cp" value="build/new-api/classes"/>
+        </antcall>
+        <antcall target="-build-one">
+            <param name="version" value="bridge"/>
+            <param name="cp" value="build/new-api/classes:build/new-spi/classes"/>
+        </antcall>
+        
+        <antcall target="-build-one">
+            <param name="version" value="test"/>
+            <param name="cp" value="build/new-api/classes:build/new-spi/classes:${junit.jar}"/>
+        </antcall>
+    </target>
+    
+    <target name="test" depends="build">
+        <echo level="info" message="Running the tests with bridge enabled. This should succeeds."/>
+        <antcall target="-run-one">
+            <param name="test.cp" value="build/new-api/classes:build/new-spi/classes:build/bridge/classes"/>
+        </antcall>
+        <echo level="info" message="Running the tests without bridge module. This should fail."/>
+        <antcall target="-run-one">
+            <param name="test.cp" value="build/new-api/classes:build/new-spi/classes"/>
+        </antcall>
+    </target>
+    
+    <!-- support methods -->
+    
+    <target name="-libraries">
+        <ant dir="../libs/"/>
+        
+        <property name="junit.jar" location="../libs/dist/junit-4.4.jar"/>
+    </target>
+    
+    <target name="-run-one">
+        <mkdir dir="build/testresults"/>
+        <junit dir="build/test/classes" errorproperty="tests.failed" failureproperty="tests.failed" fork="true" showoutput="true">
+            <batchtest todir="build/testresults">
+                <fileset dir="build/test/classes">
+                    <filename name="**/*Test.class"/>
+                </fileset>
+            </batchtest>
+            <classpath>
+                <path path="${test.cp}"/>
+                <path location="build/test/classes"/>
+                <path location="${junit.jar}"/>
+            </classpath>
+            <formatter type="brief" usefile="false"/>
+            <formatter type="xml"/>
+        </junit>
+    </target>
+    
+    <target name="-build-one">
+        <fail message="You need to specify version number" unless="version"/>
+        
+        <mkdir dir="build/${version}/classes"/>
+        <property name="cp" value=""/>
+        <javac 
+            srcdir="src-${version}" 
+            destdir="build/${version}/classes" 
+            source="1.5" target="1.5"
+            classpath="${cp}"
+        />
+        <copy todir="build/${version}/classes">
+            <fileset dir="src-${version}">
+                <exclude name="**/*.java"/>
+            </fileset>
+        </copy>
+    </target>
 </project>
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-bridge/META-INF/services/org.apidesign.impl.security.friendapi.DigestProvider
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-bridge/META-INF/services/org.apidesign.impl.security.friendapi.DigestProvider	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,3 @@
+# this shall be in a separate module that provides the "bridge"
+org.apidesign.impl.security.extension.BridgeToOldAlgorithmsProvider
+
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-bridge/org/apidesign/impl/security/extension/BridgeToOld.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-bridge/org/apidesign/impl/security/extension/BridgeToOld.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,82 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.extension;
+
+import org.apidesign.api.security.Digest;
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.Provider;
+import java.security.Security;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+/**
+ *
+ * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+public class BridgeToOld extends Provider {
+
+    public BridgeToOld() {
+        super("spi.Digestor", 1.0, "");
+        Security.addProvider(this);
+    }
+    
+    @Override
+    public synchronized Service getService(String type, String algorithm) {
+        if ("MessageDigest".equals(type)) {
+            Digest dig = Digest.getInstance(algorithm);
+            if (dig != null) {
+                return new ServiceImpl(dig, this, type, algorithm, "", Collections.<String>emptyList(), Collections.<String,String>emptyMap());
+            }
+        }
+        return null;
+    }
+
+    private static class ServiceImpl<Data> extends Service {
+        Digest dig;
+
+        public ServiceImpl(Digest dig, Provider provider, String type, String algorithm, String className, List<String> aliases, Map<String, String> attributes) {
+            super(provider, type, algorithm, className, aliases, attributes);
+            this.dig = dig;
+        }
+
+        @Override
+        public Object newInstance(Object constructorParameter) throws NoSuchAlgorithmException {
+            return new MessageDigest(getAlgorithm()) {
+                private byte[] res;
+                
+                @Override
+                protected void engineUpdate(byte input) {
+                    ByteBuffer bb = ByteBuffer.wrap(new byte[] { input });
+                    res = dig.digest(bb);
+                }
+
+                @Override
+                protected void engineUpdate(byte[] input, int offset, int len) {
+                    ByteBuffer bb = ByteBuffer.wrap(input);
+                    bb.position(offset);
+                    bb.limit(offset + len);
+                    res = dig.digest(bb);
+                }
+
+                @Override
+                protected byte[] engineDigest() {
+                    return res;
+                }
+
+                @Override
+                protected void engineReset() {
+                    dig = Digest.getInstance(getAlgorithm());
+                }
+            };
+        }
+        
+        
+    }
+
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-bridge/org/apidesign/impl/security/extension/BridgeToOldAlgorithmsProvider.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-bridge/org/apidesign/impl/security/extension/BridgeToOldAlgorithmsProvider.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,46 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.extension;
+
+import org.apidesign.impl.security.friendapi.DigestImplementation;
+import org.apidesign.impl.security.friendapi.DigestProvider;
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ *
+ * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+public class BridgeToOldAlgorithmsProvider implements DigestProvider {
+
+    public DigestImplementation create(String algorithm) {
+        try {
+            final MessageDigest md = MessageDigest.getInstance(algorithm);
+            return new DigestImplementation(algorithm) {
+
+                @Override
+                public void update(ByteBuffer bb) {
+                    md.update(bb);
+                }
+
+                @Override
+                public byte[] digest() {
+                    return md.digest();
+                }
+            };
+        } catch (NoSuchAlgorithmException ex) {
+            Logger.getLogger(BridgeToOldAlgorithmsProvider.class.getName()).log(Level.INFO, null, ex);
+            return null;
+        }
+    }
+
+    static {
+        new BridgeToOld();
+    }
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-api/org/apidesign/api/security/Digest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-api/org/apidesign/api/security/Digest.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,44 @@
+
+package org.apidesign.api.security;
+
+import java.nio.ByteBuffer;
+import org.apidesign.impl.security.friendapi.DigestImplementation;
+import org.apidesign.impl.security.friendapi.DigestProvider;
+import java.util.ServiceLoader;
+
+/** MessageDigest extends MessageDigestSpi, that means the javadoc
+ *
+ * @author Jaroslav Tulach
+ */
+// BEGIN: day.end.bridges.Digest
+public final class Digest {
+    private final DigestImplementation impl;
+    
+    /** Factory method is better than constructor */
+    private Digest(DigestImplementation impl) {
+        this.impl = impl;
+    }
+    
+    /** Factory method to create digest for an algorithm.
+     */
+    public static Digest getInstance(String algorithm) {
+        for (DigestProvider dp : ServiceLoader.load(DigestProvider.class)) {
+            DigestImplementation impl = dp.create(algorithm);
+            if (impl != null) {
+                return new Digest(impl);
+            }
+        }
+        throw new IllegalArgumentException(algorithm);
+    }
+      
+    //
+    // these methods are kept the same as in original MessageDigest,
+    // but for simplicity choose just some from the original API
+    //
+    
+    public byte[] digest(ByteBuffer bb) {
+        impl.update(bb);
+        return impl.digest();
+    }
+}
+// END: day.end.bridges.Digest
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-api/org/apidesign/impl/security/friendapi/DigestImplementation.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-api/org/apidesign/impl/security/friendapi/DigestImplementation.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,23 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.friendapi;
+
+import java.nio.ByteBuffer;
+
+/**
+ *
+ * @author Jaroslav Tulach
+ */
+public abstract class DigestImplementation {
+    final String name;
+    
+    protected DigestImplementation(String algorithm) {
+        this.name = algorithm;
+    }
+    
+    public abstract void update(ByteBuffer bb);
+    public abstract byte[] digest();
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-api/org/apidesign/impl/security/friendapi/DigestProvider.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-api/org/apidesign/impl/security/friendapi/DigestProvider.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,14 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.friendapi;
+
+/**
+ *
+ * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+public interface DigestProvider {
+    public abstract DigestImplementation create(String algorithm);
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-spi/META-INF/services/org.apidesign.impl.security.friendapi.DigestProvider
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-spi/META-INF/services/org.apidesign.impl.security.friendapi.DigestProvider	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,2 @@
+# this is a provider for the SPI, shall be in the same module as the api & spi
+org.apidesign.impl.security.spi.DigestorProvider
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-spi/org/apidesign/impl/security/spi/DigestorAccessor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-spi/org/apidesign/impl/security/spi/DigestorAccessor.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,35 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.spi;
+
+import java.nio.ByteBuffer;
+import org.apidesign.spi.security.Digestor;
+
+/**
+ *
+ * @author jarda
+ */
+public abstract class DigestorAccessor {
+    private static DigestorAccessor INSTANCE;
+    
+    protected DigestorAccessor() {
+        assert INSTANCE == null;
+        INSTANCE = this;
+    }
+    
+    public static DigestorAccessor getDefault() {
+        try {
+            Class.forName(Digestor.class.getName(), true, DigestorAccessor.class.getClassLoader());
+            return INSTANCE;
+        } catch (ClassNotFoundException ex) {
+            throw new IllegalStateException(ex);
+        }
+    }
+    
+    protected abstract <Data> byte[] digest(Digestor<Data> dig, Data data);
+    protected abstract <Data> Data create(Digestor<Data> dig, String algorithm); 
+    protected abstract <Data> void update(Digestor<Data> dig, Data data, ByteBuffer input);
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-spi/org/apidesign/impl/security/spi/DigestorProvider.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-spi/org/apidesign/impl/security/spi/DigestorProvider.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,61 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.impl.security.spi;
+
+import org.apidesign.impl.security.friendapi.DigestImplementation;
+import org.apidesign.impl.security.friendapi.DigestProvider;
+import java.nio.ByteBuffer;
+import java.util.ServiceLoader;
+import org.apidesign.spi.security.Digestor;
+
+/**
+ *
+ * @author Jaroslav Tulach
+ */
+public class DigestorProvider implements DigestProvider {
+
+    public DigestImplementation create(String algorithm) {
+        for (Digestor<?> d : ServiceLoader.load(Digestor.class)) {
+            Handler<?> h = create(d, algorithm);
+            if (h != null) {
+                return h;
+            }
+        }
+        return null;
+    }
+    
+    private static <Data> Handler<Data> create(Digestor<Data> dig, String algorithm) {
+        Data d = DigestorAccessor.getDefault().create(dig, algorithm);
+        if (d == null) {
+            return null;
+        } else {
+            return new Handler<Data>(algorithm, dig, d);
+        }
+    }
+
+    private static final class Handler<Data> extends DigestImplementation {
+        private final Digestor dig;
+        private final Data data;
+
+        public Handler(String algorithm, Digestor dig, Data data) {
+            super(algorithm);
+            this.dig = dig;
+            this.data = data;
+        }
+        
+        
+        @Override
+        public void update(ByteBuffer bb) {
+            DigestorAccessor.getDefault().update(dig, data, bb);
+        }
+
+        @Override
+        public byte[] digest() {
+            return DigestorAccessor.getDefault().digest(dig, data);
+        }
+        
+    }
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-new-spi/org/apidesign/spi/security/Digestor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-new-spi/org/apidesign/spi/security/Digestor.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,40 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package org.apidesign.spi.security;
+
+import org.apidesign.impl.security.spi.DigestorAccessor;
+import java.nio.ByteBuffer;
+
+/**
+ *
+ * @author  Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+// BEGIN: day.end.bridges.Digestor
+public abstract class Digestor<Data> {
+   protected abstract byte[] digest(Data data);
+   protected abstract Data create(String algorithm); 
+   protected abstract void update(Data data, ByteBuffer input);
+   
+// END: day.end.bridges.Digestor   
+   static {
+       new DigestorAccessor() {
+            @Override
+            protected <Data> byte[] digest(Digestor<Data> dig, Data data) {
+                return dig.digest(data);
+            }
+
+            @Override
+            protected <Data> Data create(Digestor<Data> dig, String algorithm) {
+                return dig.create(algorithm);
+            }
+
+            @Override
+            protected <Data> void update(Digestor<Data> dig, Data data, ByteBuffer input) {
+                dig.update(data, input);
+            }
+        };
+   }
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-test/META-INF/services/org.apidesign.spi.security.Digestor
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-test/META-INF/services/org.apidesign.spi.security.Digestor	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,3 @@
+# the provider registered from tests
+test.CountingDigestor
+
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-test/test/CountingDigestor.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-test/test/CountingDigestor.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,35 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package test;
+
+import java.nio.ByteBuffer;
+import org.apidesign.spi.security.Digestor;
+
+/**
+ *
+ * @author jarda
+ */
+public final class CountingDigestor extends Digestor<int[]> {
+
+    @Override
+    protected byte[] digest(int[] data) {
+        int i = data[0];
+        byte[] arr = { (byte) (i & 255), (byte) ((i >> 8) & 255), (byte) ((i >> 16) & 255), (byte) ((i >> 24) & 255) };
+        return arr;
+    }
+
+    @Override
+    protected int[] create(String algorithm) {
+        return "cnt".equals(algorithm) ? new int[1] : null; // NOI18N
+    }
+
+    @Override
+    protected void update(int[] data, ByteBuffer input) {
+        data[0] += input.remaining();
+        input.position(input.position() + input.remaining());
+    }
+
+}
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-test/test/NewAPIToOldAPITest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-test/test/NewAPIToOldAPITest.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,65 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package test;
+
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+import java.util.Arrays;
+import java.util.Random;
+import org.apidesign.api.security.Digest;
+import org.junit.After;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/** Compares that the MessageDigest and Digest yield the same results for
+ * default provider.
+ *
+ * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+public class NewAPIToOldAPITest {
+    private static byte[] arr;
+    private static long time;
+    private static byte[] resOld;
+    private static byte[] resNew;
+
+    public NewAPIToOldAPITest() {
+    }
+
+    @BeforeClass
+    public static void setUp() {
+        time = System.currentTimeMillis();
+        Random r = new Random(time);
+        arr = new byte[r.nextInt(1024)];
+        r.nextBytes(arr);
+    }
+
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void generateHashUsingMessageDigest() throws Exception {
+        MessageDigest md = MessageDigest.getInstance("MD5");
+        byte[] res = md.digest(arr);
+        resOld = res;
+    }
+
+    @Test
+    public void generateHashUsingNewDigest() throws Exception {
+        Digest d = Digest.getInstance("MD5");
+        ByteBuffer bb = ByteBuffer.wrap(arr);
+        byte[] res = d.digest(bb);
+        resNew = res;
+    }
+    
+    @Test
+    public void compareTheHashes() throws Exception {
+        if (!Arrays.equals(resOld, resNew)) {
+            fail("Arrays are different:\n" + Arrays.toString(resOld) + "\n" + Arrays.toString(resNew));
+        }
+    }
+}
\ No newline at end of file
diff -r a161a4cdb597 -r 716af5f2ebd1 samples/messagedigest/src-test/test/OldAPIToNewAPITest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/messagedigest/src-test/test/OldAPIToNewAPITest.java	Sat Jun 14 09:52:23 2008 +0200
@@ -0,0 +1,77 @@
+/*
+ * To change this template, choose Tools | Templates
+ * and open the template in the editor.
+ */
+
+package test;
+
+import org.apidesign.api.security.*;
+import java.nio.ByteBuffer;
+import java.security.MessageDigest;
+import java.util.Arrays;
+import java.util.Random;
+import org.junit.After;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/** Compares that the MessageDigest and Digest yield the same results for
+ * default provider.
+ *
+ * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ */
+public class OldAPIToNewAPITest {
+    private static byte[] arr;
+    private static long time;
+    private static byte[] resOld;
+    private static byte[] resNew;
+
+    public OldAPIToNewAPITest() {
+    }
+
+    @BeforeClass
+    public static void setUp() {
+        time = System.currentTimeMillis();
+        Random r = new Random(time);
+        arr = new byte[r.nextInt(1024)];
+        r.nextBytes(arr);
+    }
+
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void generateHashUsingMessageDigest() throws Exception {
+        // The java.security.Providers cannot be registered in META-INF/services
+        // that is why one needs to either configure various properties or
+        // make some dummy call that will initialize our bridge class.
+        // Then the bridge class registers itself as a MessageDigest provider
+        // in its constructor.
+        //
+        // This is the call:
+        Digest initialize = Digest.getInstance("MD5");
+        
+        MessageDigest md = MessageDigest.getInstance("cnt");
+        byte[] res = md.digest(arr);
+        resOld = res;
+    }
+    
+    
+    @Test
+    public void generateHashUsingNewDigest() throws Exception {
+        Digest d = Digest.getInstance("cnt");
+        ByteBuffer bb = ByteBuffer.wrap(arr);
+        byte[] res = d.digest(bb);
+        resNew = res;
+    }
+
+
+    
+    @Test
+    public void compareTheHashes() throws Exception {
+        if (!Arrays.equals(resOld, resNew)) {
+            fail("Arrays are different:\n" + Arrays.toString(resOld) + "\n" + Arrays.toString(resNew));
+        }
+    }
+}
\ No newline at end of file