Hi,
This is very interesting topic for me. Can you please send me code and
information too.
Thanx in advance.
--
With the best regards, Ints Mikelsons
(e-mail: mints@edi.lv)
(www: http://welcome.to/biocenter.lv)

Stefan M. Ranguelov wrote:

> Hi !
>
> I just have written my first version of the
> RC5 encryption algorithm for the PIC.
>
> RC5 is the block chipher used in net*scap_e
> browsers. It uses a combination of add's,
> xor's and data dependent rotations. More usefull
> links to RC5 can be found on the
> http://www.uni-siegen.de/security/krypto/rc5.html
> page. It's in german, but the links are pointing to
> english pages.
>
> My code :
> - is simulated with some values and seems to work. It
>   delivers the same results as the C programm on my pc.
>
> - execution time / steps does not depend on encrypted data
>   or key.
>
> Work to be done :
>
> - since i am going to use rc5 as a crypt. strong hash
>   function i have implemented only the encryption at
>   this time. Decryption shoul'd be easy to implement
>   from this code.
>
> - the code is not optimized for speed/space. It uses
>   about 290 words of code including the key table and
>   takes about 10000 steps to encode 64 bit of data in
>   12 rounds
>
> - code is written in paralax style assembler and may
>   look ugly to some of you
>
> If sombody is interested in the code i can send it via
> priv. e-mail.
>
> St.