Re: Skipjack - optimized C source

Mark Tillotson (markt@harlequin.co.uk)
Sat, 27 Jun 1998 18:20:54 +0100

• Next message: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"
• Previous message: C Matthew Curtin: "Re: OCR of Skipjack/KEA document being attempted"
• In reply to: John Young: "Re: OCR of Skipjack/KEA document being attempted"
• Next in thread: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"
• Reply: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"

Panu Rissanen <Panu.Rissanen@lut.fi> wrote:

| Hi,
|
| I have written very unoptimized test implementation of the
| algorithm. The test run uses vectors found from III. ANNEX - Test Vectors.
| At least you have now the ftable in machine readable form.
|
| ftp://ftp.funet.fi/pub/crypt/cryptography/symmetric/skipjack/
|
| Rgs,
| /Bande
|
Thanks for that - I took it as the basis for a more optimized version
(well, the F-table survives!) and added decryption.

http://utter.chaos.org.uk/~markt/crypt/opt-sj.zip

or individually:

http://utter.chaos.org.uk/~markt/crypt/opt-sj.c
                                      /opt-sj.h
                                      /test-sj.c

Enjoy!

[ Its fully inlined and is about 22 instructions per round (90 per
  byte) on a Sparc, compiled with " gcc -O " ]

__Mark
[ markt@harlequin.co.uk | http://www.harlequin.co.uk/ | +44(0)1954 785433 ]
[ personal homepage http://utter.chaos.org.uk/~markt/ | fax " " 785444 ]

• Next message: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"
• Previous message: C Matthew Curtin: "Re: OCR of Skipjack/KEA document being attempted"
• In reply to: John Young: "Re: OCR of Skipjack/KEA document being attempted"
• Next in thread: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"
• Reply: Mark Tillotson: "Re: Skipjack - (even more) optimized C source"