Dex manipulation library

Related tags

Security & Decompiler dexterity
Overview

dexterity

Description

dexterity is a C library intended for manipulation and analysis of DEX files. It has python bindings for all basic DEX structures and most of the manipulation functions.

WARNING: This library is still in it's early stages of development, use at your own risk!

Examples

Mirror

The following example parses a DEX file using the built-in parser and then writes a new DEX file from the parsed structures in memory.

#!/usr/bin/python

from dx.dex import Dex

dex = Dex("classes.dex")
dex.save("mirror.dex")
Add String

The following example parses a DEX file, add a string to it, creates a new DEX file with the modifications and fix the signature and checksum of the new file.

#!/usr/bin/python

from dx.dex import Dex
from dx.hash import update_signature
from dx.hash import update_checksum

dex = Dex("classes.dex")
dex.add_string("Hello World")
dex.save("hello.dex")

update_signature("hello.dex")
update_checksum("hello.dex")

For more examples of other usages of the library, check the examples folder.

License

dexterity is released under BSD 3-clause license. Please check LICENSE for more details.

Support

For questions and/or suggestions, join #droidsec on Freenode.

Comments
  • Make Error OSX

    Make Error OSX

    gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) 12.2.1 Darwin Kernel Version 12.2.1:

    When I try run make on my OSX box I get the following errors:

    $ make make -C lib gcc -fPIC -std=gnu99 -g -c bytestream.c bytestream.c:2:20: error: malloc.h: No such file or directory bytestream.c: In function ‘bsalloc’: bytestream.c:16: warning: implicit declaration of function ‘printf’ bytestream.c:16: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c:27: error: ‘MAP_ANONYMOUS’ undeclared (first use in this function) bytestream.c:27: error: (Each undeclared identifier is reported only once bytestream.c:27: error: for each function it appears in.) bytestream.c:31: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c: In function ‘bsmap’: bytestream.c:46: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c:52: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c:60: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c:76: warning: incompatible implicit declaration of built-in function ‘printf’ bytestream.c: In function ‘bssave’: bytestream.c:250: error: ‘FILE’ undeclared (first use in this function) bytestream.c:250: error: ‘f’ undeclared (first use in this function) bytestream.c:250: warning: implicit declaration of function ‘fopen’ bytestream.c:254: warning: implicit declaration of function ‘fwrite’ bytestream.c:254: warning: incompatible implicit declaration of built-in function ‘fwrite’ bytestream.c:256: warning: implicit declaration of function ‘fflush’ bytestream.c:257: warning: implicit declaration of function ‘fclose’ make[1]: *** [bytestream] Error 1 make: *** [build_lib] Error 2

    opened by HenryHoggard 3
  • Documentation on libdexterity.so

    Documentation on libdexterity.so

    I know it's been a while since this project has been touched but while it's being a side result of the code: Is it possible to get something like a usage example or API documentation on libdexterity?

    I was looking for a Dex-Parser in C and it was the closest I got, but I am having a hard time trying to use the lib for a project.

    Thanks in advance!

    opened by strangeloveBsc 2
  • Wrong size of the struct

    Wrong size of the struct

    DXPARSE(_name,_type) use the size of the struct to load the data. However, sizeof DexTypeItem is wrong due to the default alignment in compiler. Therefore DXPARSE read two more extra bytes when reading DexTypeItem which set the buffer position in wrong place.

    opened by fredrikluo 1
  • Improve const-correctness

    Improve const-correctness

    I suggest to add the key word "const" to the type specifiers for parameters like "filename" (functions "bsmap" and "dx_build"). Would you like to apply the advices from an article to more places in your source files?

    opened by elfring 3
  • reserved identifier violation

    reserved identifier violation

    I would like to point out that identifiers like "__DEX__" and "_ByteStream" do not fit to the expected naming convention of the C language standard. Would you like to adjust your selection for unique names?

    opened by elfring 4
Owner
Rodrigo Chiossi
Rodrigo Chiossi
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