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bg a écrit :
>
>>> RSA doesn't run as expected. With expopent=3 and length=512,
>>> program doesn't crash but after four hours (@ 16 MHz on
>>> simavr), gdb shows that program stays in RSA subroutines and
>>> doesn't return to main routine. Something is probably broken
>>> somewhere.
>
> 1) Sorry for the delayed reply.
You're welcome.
> 2) I'm somewhat lacking the time to improve and document
> avr-crypto-lib (this also caused item 1)
>
> 3) RSA was newer really stable, or of useable speed (even with 1024
> bit keys). Also the current implementation is lacking some
> important optimizations.
>
> 4) I used the VLA additions of C99 to avoid issues with heap
> allocation, but they bring some problems of their own.
>
> 5) You may find https://munacl.cryptojedi.org/atmega.shtml
> helpful.
>
> I hope to find some spare time to get some stuff better documented
> and improved (or remove what can't be fixed).
>
> For short: I doubt that RSA on an AVR could be brought to a
> productive use (maybe except for some cases where you are willing
> to wait minutes).
My application only uses encryption the first time firmware is
booted. After this first encryption, it only call decrypt functions. I
have obtained the same results with uECC and AES.
Best regards,
JKB
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