Re: avr-crypto-lib

[BERTRAND Joël]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

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
-----BEGIN PGP SIGNATURE-----
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=9n8c
-----END PGP SIGNATURE-----