sdc

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               SDC - Self Decrypting Binary Generator
          Copyright (C) 2006 Claes M Nyberg <[email protected]>
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The SDC program creates self decrypting binaries for common operating systems
and architectures. The target file is encrypted using Blowfish in Ciphertext
Feedback Mode (CFB) and appended to an executable which reads itself and
attempts to decrypt the appended data when it is run.

Running 'make' in the src directory will present a few options:

	$ make

	make <target>

	SDC generator targets:
  		linux_x86
  		windows_x86
  		openbsd_x86
  		openbsd_arm
  		openbsd_sparc64
  		freebsd_x86
  		netbsd_x86
  		solaris_sparc

	Self decrypt targets:
  		selfdecrypt_linux_x86
  		selfdecrypt_windows_x86
  		selfdecrypt_openbsd_x86
  		selfdecrypt_openbsd_arm
  		selfdecrypt_openbsd_sparc64
  		selfdecrypt_netbsd_x86
  		selfdecrypt_freebsd_x86
  		selfdecrypt_solaris_sparc

The SDC generator targets will build an sdc binary for that platform which
can be used to generate a self decrypting file for any of the self decrypt targets.

Building a "Self decrypt target" will build the actual self decrypting binary for that target.
Strip it from symbols and run the genhex.pl script on the resulting selfdecrypt binary together 
with its length to output an escaped string which can be redirected to create a header file, 
just like one of those inside the targets directory. Then add the include file to targets.h t
o add it to the sdc binary when it is built next time.

The presented targets does already exist as header files and are already included into the sdc binary.

* Add compression of the file before encryption to increase confusion.
* OpenBSD ARM support
* MacOSX Support

In order for the elf_offset() routine to work, the ELF file (selfdecrypt) 
should be stripped (I'm to lazy to calculate size of string table).

	 ./sdc /etc/services
	Encryption key:
	Verify key:
	Writing self decrypting file services.sdc for Linux x86 (ELF)
	 ./services.sdc
	Encryption key:
	Decrypting to services
	$

	$ ./sdc -t Windows_x86 /etc/services
	Encryption key:
	Verify key:
	Writing self decrypting file services.sdc.exe for Windows x86 (PE-COFF)