jhoja
The Java disassembler for Jasmin, Decompile protection tool for JD
Japanese(日本語)
Last update 24 Mar 2018
What is the jhoja
jhoja is a disassembler of Java class file.
Convert Java class file to Jasmin assembler code.
jhoja can insert decompile protection code.(-g option)
command line tool.
does not have GUI.
SWAG javap2 Ver 1.02 based.
forked from SWAG javap2. http://www.swag.uwaterloo.ca/javap2/
Important problems
Re-assemble support Ascii code sources only.
(without comments.)
not support other character codes.
jhoja support output UTF-8 strings.
but Jasmin does not support UTF-8.
if convert UTF-8 source to your local character code, may work on your locale systems.
but it will be lost cross platforms.
Decompile protection function support JD-GUI Decompiler.
but does not support Jad Decompiler.
Download
Download jhoja Ver 1.01 for Windows. (including source patch.)
Download from GitHub. (including patched source.)
What is the difference between jhoja and javap,SWAG javap2?
jhoja support Jasmin assembler code.
and jhoja support decompile protection function.
Oracle javap and SWAG javap2 does not support them.
jhoja output UTF-8 code.
javap2 does not support UTF-8.
Decompile protection function
Decompile protection function support JD-GUI Decompiler.
but does not support Jad Decompiler.
Decompile protection function does not affect the speed.
but larger than normal class file.
because insert protection code.
require Jasmin(Java assembler) and JRE or JDK.
not hard protection.
if use jhoja and Jasmin then easily crack decompile protection.
Examples: Decompile jhoja decompile protection class file by JD-GUI Decompiler.
Debug information
You can read any debug information in source comments.
but re-assemble will be lost debug information in class file.
Support OS
Binary file support Microsoft Windows.
Compiled by C++ Builder XE8.
Written by C++. but allmost C.
if recompile may work on other OS.
jhoja for Windows work on GNU/Linux for Intel/AMD CPU with wine.
Binary License
Apache v2 license
(follow the SWAG's license.)
jhoja ver 1.01 Source patch License
Apache v2 license
(follow the SWAG's license.)
chenged 2-clause BSD license to Apache v2 licence.
(C) Masaki Oba
admin@nabeta.tk
http://www.nabeta.tk
Example A part of disassemble code
.field hizuke_str Ljava/lang/String;
.field moto_gatsu I
.field moto_nen I
.field static properties Ljava/util/Properties;
.field static menubarheight I
.method private static resizeframe(II)V
.limit stack 6
.limit locals 20
getstatic asucalendar/menubarheight I
istore 18
iload_0
iconst_2
iadd
istore 16
iload_0
iload_1
if_icmple Z18
iload_1
istore 16
;.line 101
Z18:
iload 16
i2f
f2d
ldc2_w 0.200000
dmul
d2i
istore 17
iload 17
bipush 40
if_icmplt Z43
iload_0
sipush 300
if_icmpge Z47
;.line 103
Z43:
bipush 40
istore 17
;.line 106
Z47:
getstatic asucalendar/bbb Ljavax/swing/JPanel;
iconst_0
iload 18
iload_0
iconst_1
isub
iload 17
iload 18
iadd
iconst_1
isub
invokevirtual javax/swing/JPanel/setBounds(IIII)V
getstatic asucalendar/tugi Ljavax/swing/JButton;
iload_0
iconst_1
isub
bipush 65
isub
iconst_1
bipush 30
bipush 19
invokevirtual javax/swing/JButton/setBounds(IIII)V
getstatic asucalendar/tugi_nen Ljavax/swing/JButton;
iload_0
iconst_1
isub
bipush 30
isub
iconst_1
bipush 30
bipush 19
invokevirtual javax/swing/JButton/setBounds(IIII)V
getstatic asucalendar/lb Ljavax/swing/JLabel;
iconst_1
bipush 12
iload_0
iconst_1
isub
iload 17
iconst_1
isub
invokevirtual javax/swing/JLabel/setBounds(IIII)V
getstatic asucalendar/dp Ljavax/swing/JPanel;
iconst_0
iload 18
iload 17
iadd
iload_0
iconst_1
iadd
iload_1
iload 18
isub
iload 17
isub
iconst_1
iadd
invokevirtual javax/swing/JPanel/setBounds(IIII)V
iload 17
bipush 40
if_icmpgt Z164
iload 17
bipush 20
isub
i2f
f2d
ldc2_w 0.700000
dmul
d2i
istore 10
goto Z178
;.line 115
Z164:
iload 17
bipush 20
isub
i2f
f2d
ldc2_w 0.600000
dmul
Usage
Usage: jhoja [-g] [-h] xxx.class > xxx.j
-g: Insert decompile protection code.
-h: show help.
Examples:
jhoja -g xxx.class > xxx.j
jhoja xxx.class > xxx.j
jhoja xxx.class | more
Examples with Jasmin
does not Insert discompile protection code.
jhoja xxx.class > xxx.j
java -jar jasmin.jar xxx.j
Insert discompile protection code.
jhoja -g xxx.class > xxx.j
java -jar jasmin.jar xxx.j
Example Decompile protection batch file for All class files
Windows batch file.
require Jasmin(Java assembler) and JRE or JDK.
C:\>zenbu *.class
zenbu.bat
@echo off
for %%f in (%*) do (
jhoja -g %%f > %%f.j
java -jar jasmin.jar %%f.j
)
History
12 Mar 2018 jhoja for Windows Ver 1.0 (binary and source patch)
13 Mar 2018 fixed a HTML file in ZIP file
14 Mar 2018 fixed HTML files in ZIP file
24 Mar 2018 ver 1.01
Link
SWAG Javap2
JASMIN HOME PAGE
Online Dictionary site
Online NabetaJisho
Online Dictionary Quiz site
Online NabetaJisho Quiz
More information
NabetaJisho Japanese site
Mail
admin@nabeta.tk
NabetaJisho Homepage
