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RE: [aspectj-users] AspectJ and obfuscator
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BTW, just so you know, obfuscation can often confuse the hell out of the JIT
compiler (if there is one) and can slow down execution (even if there isn't
a JIT compiler), since it tends to do some strange things with bytecode in
order to make it less readable (and, by extension, less easily executed).
I've heard, anecdotally, of slowdowns of up to 33% due to obfuscation.
As a general rule, if you put code on my machine, I can reverse it
regardless of what kinds of protection you put on it. (If all else fails, I
can slap a debugger on the running process and watch it that way.) You might
want to seriously reconsider the obfuscation step entirely.
Ted Neward
Author, Instructor, Consultant
Java, .NET, Web services
http://www.neward.net/ted
> -----Original Message-----
> From: aspectj-users-admin@xxxxxxxxxxx [mailto:aspectj-users-
> admin@xxxxxxxxxxx] On Behalf Of Sebastian Berger
> Sent: Friday, February 04, 2005 10:01 AM
> To: aspectj-users@xxxxxxxxxxx
> Subject: [aspectj-users] AspectJ and obfuscator
>
> Hi,
>
> I really have some big problems with writing an ant build file for an
> application using an AspectJ aspect. The application is a J2ME project and
> that's why I need an abfuscator. I am using proguard as obfuscator and
> since
> 3 days I am now trying to write an ant file for building my project. Cause
> I
> am relative new to writing ant-files by myself, maybe the solution of the
> problem is easy, but at the moment I don't see any way to solve my
> problem...
> So the problem is that I don't know which jars to include in the
> obfuscation
> process, cause when I try to start my application I always get an error
> that
> he cannon find class org/aspectj/lang/NoAspectBoundException. I tried
> several things, like including aspectjtools.jar and aspectjrt.jar in the
> obfuscation-process, but none has any positive results on building... I
> only
> get millions of warnings, when I do this. So here is my actual build-file
> (I
> am already using as compiler the ajc-compiler; as ant-task I am using
> iajc):
>
> build.xml:
> ---------------
> <project name="biginteger" default="dist" basedir="..">
> <property name="project" value="biginteger"/>
> <property name="WTK.dir" value="C:\Programme\WTK21"/>
> <property name="MIDP.lib" value="${WTK.dir}\lib\midpapi20.jar" />
> <property name="CLDC.lib" value="${WTK.dir}\lib\cldcapi11.jar" />
>
> <property name="jdk.home" value="C:\java\j2sdk" />
> <property name="ajc.home" value="C:\Programme\aspectj" />
>
> <!-- The following property is needed only for obufscate_proguard. -->
> <property name="proguard"
> value="c:\Programme\proguard\lib\proguard.jar"/>
>
> <taskdef
> resource="org/aspectj/tools/ant/taskdefs/aspectjTaskdefs.properties">
> </taskdef>
>
> <path id="bootclasspath">
> <pathelement path="${MIDP.lib}"/>
> <pathelement path="${CLDC.lib}"/>
> </path>
>
> <!-- The following property is only needs for the "tools"
> and "jad" targets. -->
> <property name="ant" value="C:\Programme\apache_ant"/>
>
> <path id="ajc.classpath">
> <pathelement location="${ajc.home}/lib/aspectjrt.jar" />
> <pathelement location="${ajc.home}/lib/aspectjtools.jar" />
> <pathelement location="${ajc.home}/lib/aspectj-ant.jar" />
> <pathelement location="${jdk.home}/lib/tools.jar" />
> </path>
>
> <path id="app.classpath">
> <pathelement location="${CLDC.lib}" />
> <pathelement location="${MIDP.lib}" />
> </path>
>
> <path id="app.crypt">
> <pathelement location="../lib/midp_classes.zip" />
> </path>
>
> <property name="Aspect.lib" value="${ajc.home}/lib/aspectjrt.jar" />
>
> <!-- Runs the application in the emulator. -->
> <target name="run">
> <exec executable="${WTK.dir}/bin/emulator">
> <arg line="-classpath build/bin/${project}.jar"/>
> <arg line="-Xdescriptor build/bin/${project}.jad"/>
> </exec>
> </target>
>
> <!-- Adjusts the JAR size in the JAD. -->
> <target name="jad" depends="dist">
> <taskdef name="jad" classname="JarSizeFix"/>
> <jad jar="build/bin/${project}.jar" jad="build/bin/${project}.jad"/>
> </target>
>
> <!-- Packages the application -->
> <target name="dist" depends="preverify">
> <mkdir dir="build/bin"/>
> <jar basedir="build/preverified"
> jarfile="build/bin/${project}.jar"
> manifest="MANIFEST.MF">
> </jar>
> <copy file="${project}.jad"
> tofile="build/bin/${project}.jad"/>
> </target>
>
> <!--
> This target runs the preverifier on the class files.
>
> Change 'depends' attribute here to select obfuscation:
> obfuscate_proguard
> obfuscate_retroguard
> obfuscate_null
> -->
> <target name="preverify" depends="obfuscate_proguard">
> <mkdir dir="build/preverified"/>
> <exec executable="${WTK.dir}/bin/preverify">
> <arg line="-classpath ${MIDP.lib};${CLDC.lib}"/>
> <arg line="-d build/preverified"/>
> <arg line="build/obfuscated"/>
> </exec>
> </target>
>
> <!-- Obufscates using ProGuard. -->
> <target name="obfuscate_proguard" depends="compile, copylib">
> <mkdir dir="build/proguard"/>
> <jar basedir="build/classes"
> jarfile="build/proguard/${project}-input.jar"/>
>
> <java fork="yes" classname="proguard.ProGuard"
> classpath="${proguard}">
> <arg line="-libraryjars ${MIDP.lib};${CLDC.lib}"/>
> <arg line="-injars build/proguard/${project}-input.jar"/>
> <arg line="-outjar build/proguard/${project}-output.jar"/>
> <arg line="-keep 'public class * extends
> javax.microedition.midlet.MIDlet'"/>
> <arg line="-defaultpackage"/>
> <arg line="-dontusemixedcaseclassnames"/>
> </java>
>
> <mkdir dir="build/obfuscated"/>
> <unjar src="build/proguard/${project}-output.jar"
> dest="build/obfuscated"/>
> </target>
>
> <!-- Unjars the library APIs in preparation for obfuscation. -->
> <target name="copylib" depends="init">
> <unjar src="lib/midp_classes.zip" dest="build/classes"/>
> </target>
>
> <!-- Compiles the source code. -->
> <target name="compile" depends="init">
> <mkdir dir="build/classes"/>
> <iajc destdir="build/classes">
> <sourceroots>
> <pathelement location="src"/>
> </sourceroots>
> <classpath>
> <path refid="ajc.classpath"/>
> <path refid="app.classpath"/>
> <path refid="app.crypt"/>
> </classpath>
>
> </iajc>
> </target>
>
>
> <!-- Builds the JarSizeFix Ant task and installs it
> in the Ant lib directory. -->
> <target name="tools">
> <mkdir dir="build/tools_classes"/>
> <javac destdir="build/tools_classes"
> srcdir="build/tools"
> target="1.1"/>
> <jar jarfile="${ant}/lib/wd-tools.jar">
> <fileset dir="build/tools_classes"/>
> </jar>
> <delete dir="build/tools_classes"/>
> </target>
>
> <target name="init">
> <tstamp/>
> </target>
>
> </project>
> -------------------------------------------------------
>
> As result of starting this build.xml file with ant, I get the following
> result:
> -----------------------------
> Buildfile: build.xml
>
> init:
>
> compile:
> [mkdir] Created dir: D:\Programmierung\studi\biginteger\build\classes
>
> copylib:
> [unjar] Expanding:
> D:\Programmierung\studi\biginteger\lib\midp_classes.zip i
> nto D:\Programmierung\studi\biginteger\build\classes
>
> obfuscate_proguard:
> [mkdir] Created dir: D:\Programmierung\studi\biginteger\build\proguard
> [jar] Building jar:
> D:\Programmierung\studi\biginteger\build\proguard\bigi
> nteger-input.jar
> [java] ProGuard, version 3.2
> [java] Reading program jar [build/proguard/biginteger-input.jar]
> [java] Reading library jar [C:\Programme\WTK21\lib\midpapi20.jar]
> [java] Reading library jar [C:\Programme\WTK21\lib\cldcapi11.jar]
> [java] Preparing output jar [build/proguard/biginteger-output.jar]
> [java] Copying resources from program jar
> [build/proguard/biginteger-input.
> jar]
> [mkdir] Created dir:
> D:\Programmierung\studi\biginteger\build\obfuscated
> [unjar] Expanding:
> D:\Programmierung\studi\biginteger\build\proguard\biginte
> ger-output.jar into D:\Programmierung\studi\biginteger\build\obfuscated
>
> preverify:
> [mkdir] Created dir:
> D:\Programmierung\studi\biginteger\build\preverified
> [exec] Error preverifying class c
> [exec] VERIFIER ERROR c.b()Lc;:
> [exec] Cannot find class org/aspectj/lang/NoAspectBoundException
> [exec] Result: 1
>
> dist:
> [jar] Building jar:
> D:\Programmierung\studi\biginteger\build\bin\bigintege
> r.jar
>
> jad:
> [jad] MIDlet-Jar-Size: 30230
>
> BUILD SUCCESSFUL
> -----------------------------------------
>
> So the j2me preverifier tells me that he couldn't find the class:
> org/aspectj/lang/NoAspectBoundException
>
> I really don't know how to solve the problem, so for any hints I would be
> sooooo thankful and happy, cause I am really getting depressed with this.
>
> Thanks in advance,
> Sebastian
>
>
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