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1996-06-11
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BF-SDK
Blowfish Software Development Kit
Version 1.1
(c) 1996 Markus Hahn & Cedric Reinartz
1. Disclaimer
~~~~~~~~~~~~~
This software is "as it is" .
The makers and developers of this package make no representation, warranty,
assurance or inducement, express or implied, as to its adequacy, sufficiency
or freedom from defect of any kind. Neither the makers or developers will
have any liability to any user resulting from the use of it nor are they
responsible for any data loss or computer failure resulting from any inherent
incompatibilities with any other software or hardware.
2. Introduction
~~~~~~~~~~~~~~~
This is the Blowfish System Development Kit.
It provides the basic functions to en-/decrypt data in ECB and CBC mode.
You can directly use it in Turbo/Borland Pascal, TASM/MASM and even
in MS Visual C++. Interfaces for other languages like Fortran or Cobol
are easy to implement.
To learn how Blowfish works, read BFCBCGR.TXT. Unfortunately it's only
in German (too less time), but you should be able to understand the
functionality of the BF-SDK easily by studying the examples in assembly,
Pascal or C++.
If you want to know more about Blowfish, data encryption and security, please
read
"Applied Cryptography, 2nd Edition" by Bruce Schneier
ISBN 0-472-11709-9
Just send an e-mail to Bruce (schneier@counterpane.com) to get an 15% discount.
To learn how to use the provided sources read PASCAL.TXT for the Turbo-
Pascal part, ASM.TXT for the assembly part and CPPTXT for the C++ part.
We're interested in any feedback! If you have any questions, suggestions or
improvements, please leave us an e-mail.
3. Files in this package
~~~~~~~~~~~~~~~~~~~~~~~~
sourcecode: BFENG386.ASM the engine, the heart of all
BFE_ASM.INC macros to help in writing assembly apps
BLOWFISH.PAS Pascal unit interface
BLOWFISH.H needed for C implementations
CPP_DEMO.CPP demo written in MS Visual C++
ASM_DEMO.ASM demo written in assembly language
PAS_DEMO.PAS demo written in Pascal
precompiled: BFENG386.OBJ object file of the cryptengine
BLOWFISH.TPU Borland Pascal Unit
ASM_DEMO.EXE assembly demo executable
PAS_DEMO.EXE Pascal demo executable
CPP_DEMO.EXE QuickWin demo for Windows 3.x (and above)
documentation: BF-SDK.TXT you're reading this now
BFCBCGR.TXT explanation of Blowfish (german only, sorry)
ASM.TXT explanation on how to use BF-SDK in Assembler
CPP.TXT explanation on how to use BF-SDK in C++
PASCAL.TXT explanation on how to use BF-SDK in Pascal
misc: MAKEALL.BAT batch file which compiles all the precompiled
from the source, except of the MSVC project
FILE_ID.DIZ BBS description
4. Technical Notes
~~~~~~~~~~~~~~~~~~
This software needs at least:
- IBM compatible AT-system with an 80386SX processor or better
- DOS 3.0 or above
achieved speed: 1.8 MB/sec on a Pentium90
2.7 MB/sec on a Pentium133
The actual version (1.1) is designed for 16bit systems, so you
should be able to use it in every - DOS real mode application
- DOS 286 protected mode application
- Windows 3.x application flawlessly.
5. Copyrights
~~~~~~~~~~~~~
Blowfish is a data encryption algorithm which was published in the Dr.Dobb's
Journal magazine, issue #213 on April 1994. It was developed by Bruce Schneier
and is unpatented and placed in the public domain.
In the September issue 1995 of DDJ Blowfish was (after a sponsored contest)
still unbreaked.
The advantages of this encryption algorithm is its design for 32bit CPUs like
the 80386 and above achieving an excellent performance with a maximum
gain of security.
The Blowfish implementation used in this software was done by:
Markus Hahn
Schellingstrasse 13
72622 Nuertingen
Germany
e-mail: hahn@pcmail.rz.fht-esslingen.de
and
Cedric Reinartz
Schumannstrasse 51
40822 Mettmann
Germany
e-mail: cer@servww4.ww.uni-erlangen.de (till end of 1996)
6. Distribution and usage limits
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The BF-SDK can be distributed freely if:
- all files are distributed together
- all files are unmodified
- no fee (excluding material and shipping costs) is taken
If you use BF-SDK 1.1 for your own private purpose or if you developed
a program which is totally free and not bundled with a non-free product,
you can do so without paying any money (to us or someone else).
For any other use (especially profit use) you have to contact Markus Hahn
and Cedric Reinartz.
In any case you have to:
- write a program documentation which contains the whole Copyright
statement (part 5) from this text.
- send us (both) a note that you are using it!
7. The real world
~~~~~~~~~~~~~~~~~
The BF-SDK is used in the following products:
* ASPICRYP by Cedric Reinartz, a DOS based TSR which hooks to an
ASPI-Manager and encrypts the data going to a SCSI-device using the
Blowfish algorithm in CBC mode.
You can get it at:
ftp.franken.de
/pub/crypt/misc/ASPICRxx.ZIP
ftp.garbo.uwasa.fi
/pub/crypt/ASPICRxx.ZIP
* Blowfish Advanced 7 (BFA7) by Markus Hahn
a fast, secure and comfortable file encryption utility
for 386+ and DOS. It'll soon be available for Windows 95, too.
You can get it at:
ftp.uni-stuttgart.de
/pub/systems/pc/security/BFA7xx.ZIP
ftp.garbo.uwasa.fi
/pub/crypt/BFA7xx.ZIP
8. The Future
~~~~~~~~~~~~~
It would be nice to have some CFB routines, which allows Blowfish
to work as a stream cipher, encrypting and decrypting single bytes,
although the performance will be decreased to about 12% of the
original one.
If you want to contribute something, send it to Cedric Reinartz
or Markus Hahn.
- end of document -