metasploit-framework/lib/msf/core/payload/dalvik.rb

# -*- coding: binary -*-
require 'msf/core'

module Msf::Payload::Dalvik

  #
  # Fix the dex header checksum and signature
  # http://source.android.com/tech/dalvik/dex-format.html
  #
  def fix_dex_header(dexfile)
    dexfile = dexfile.unpack('a8LH40a*')
    dexfile[2] = Digest::SHA1.hexdigest(dexfile[3])
    dexfile[1] = Zlib.adler32(dexfile[2..-1].pack('H40a*'))
    dexfile.pack('a8LH40a*')
  end

  #
  # We could compile the .class files with dx here
  #
  def generate_stage
  end

  #
  # Used by stagers to construct the payload jar file as a String
  #
  def generate
    generate_jar.pack
  end

  def java_string(str)
    [str.length].pack("N") + str
  end

end