Hi !


Pavel Korensky wrote:
>
...
> >> I would like to ask you, if somebody have the assembler source code for
> >> encryption algorithms like Blowfish or IDEA on PIC microcontroller.



I was also looking for an symetric chiper suitable for implementation
on a PIC. Most algorithms use too much RAM or nonlinear mathematical
operations. ( Like IDEA).

IIRC sombody on the list has written a DES implementation, but he lives
in USA and would not like to send the code to Europe. I dont know wich
PIC device he uses. I could dig up the adress so you can ask him by
priv. e-mail.

I find the RC5 algorithm very easy. It should fit into a little PIC
device like 16F84. It uses data dependent shifts combined with additions
and XORs. Key length, chipher block length and the number of iterations
can be adjusted to meet the particular security level needet.

You can search on the internet for the rfc2040 for a description.

I have started implementing it, but still have no time to finish it.
If there is interest i could let the list know when its reay.


> >> Also, I would like to ask you, if anybody have the asm source for hash
> >> functions like SHA or MD5.
> >

I have read IDEA can also be used for hashing and pseudo random number
generation. Don't see why not to use RC5 for hashing ?


Please let me know if you find some good code.

St.